EE-RM-93-501 COMMENT 0

Monday 

August 23, 1993 

Part II 

Departmen

Energy 

Office of Energy Effi

Renewable Energy 

10 CFR Part 430 

Energy Conservation 

Consumer Products; 
EE-RM-93-501 COMMENT 00

44538 Federal R.egister I Vol. 58, No. 161 / Monday, August 23, 1993 / Proposed Rules 

DEPARTMEi'oiT OF ENERGY 

Office of Energy Efficiency and 

Renewable Energy 

10 CFR Part 430 

[Docket No. EE-RM-93-501] 

Energy Conservation Program for 

Consumer Products: Test Procedures 

for FumacesIBollers. Vented Home 

Heating Equipment, and Pool Heaters 

AGENCY: Office of Energy Efficiency and 

Renewable Energy, Department of 

Energy. 

ACTION: Proposed Rule and Public 

Hearing. 

SUMMARY: The Energy Policy and 

Conservation Act. as amended, requires 

the Department of Energy (DOE or the 

Department) to administer an energy 

conservation program for certain major 

household appliances and commercial 

equipments. Among other program 

elements, the Act requires that standard 

methods of testing be prescribed for 

each covered product. The purpose of 

today's notice of proposed rulemaking is 

to update references. request data, 

comments, and information on 

proposed amendments to the furnaces 

and boilers, vented home heating 

equipment, and poel heater test 

pocedures. -

DATES: Written comments in response to 

this document must be received by 

November 22, 1993. 

Oral views, data, and arguments may 

be presented at the public hearing to be 

held on Monday, September 20,1993. 

Requests to speak at the hearing must be 

received by the Department no later 

than 5 p.m., Friday, September 10, 1993. 

Ten (10) Copies of statements to be 

given at the public hearing must be 

received by the Department no later 

than 5 p.m .. Wednesday. September 15. 

1993. 

AOGRESSES: Written comments and 

requests to speak at the public hearing 

are to be submitted to: u.s. Department 

of Energy, Office of Energy EffiCiency 

and Renewable Energy, Hearings and 

Dockets, "Test Procedures for Furnaces/ 

Boilers, Ver:ted Home Heating 

Equipment, and Pool Heaters," (Docket 

No. EE-RM-93-501), Forrestal Building, 

1000 Independence Avenue SW., 

Washington, DC 20585, (202) 586-D561. 

The hearing will begin at 9:30 a.m .. 

and will be held at the U.S. Department 

of Energy, Forrestal Building, Room 1E245, 1000 Independence Avenue, SW., 

Washington, D.C. 

Requests may be hand delivered to 

such address hetween the hours of 8 

a.m. and 4 p.m., Monday through 

Friday, except Federal holidays. 

Requests should be labeled "Furnaces, 

Vented Home Heating Equipment. and 

Pool Heaters Test Procedures," (Docket 

No. EE-RM-93-501), both on the 

document and on the envelope. 

Copies of the transcript of the public 

hearing and public comments received 

may be read and/or photocopied at the 

DOE Freedom of Information Reading 

Room, U.S. Department of Energy, 

Forrestal Building. Room 1E-190. 1000 

Independence Avenue SW., 

Washington, DC 20585, (202) 586--£020, 

between the hours of 9 a.m. and 4 p.m., 

Monday through Friday, except Federal 

holidays. 

For more information concerning 

public participation in this rulemaking 

proceeding, see section vm of the 

"SUPPLEMENTARY INfORMATION." 

fOR fURTHER INfORMAnON CONTACT: 

Cyrus H. Nassefi, U.S. Department of 

Energy, Office of Energy Efficiency 

and Renewable Energy, Mail Station 

EE-431, Forrestal Building, 1000 

Independence Avenue, SW .• 

Washington, DC 20585, (202) 586-

9127. 

Eugene Margolis, Esq. U.S. Department 

of Enf'rgy, Office of G.maral Counsel, 

Mail Station GC-41, Forrestal 

Builciing, 1000 Independence Avenue, 

SW., Washington, DC 20585, (202) 

586--9507. 

SUPPlEMENTARY INfORMATION: 

I. Introduction 

A. Authority 

Part B of Title III of the Energy Policy 

and Conservation Act, Public Law 94-

163. as amended by the National Energy 

Conservation Policy Act, Public Law 

95-£19, the National Appliance Energy 

Conservation Act of 1987, Public Law 

100-12, the National Appliance Energy 

Conservation Amendments of 1988. 

Public Law 100-357 and the Energy 

Policy Act of 1992, Public Law 102-486, 

croated the Energy Conservation 

Program for Consumer Products other 

than Automobiles (Program}.1 The 13-

consumer household products currently 

subject to this Program (often referred to 

hereafter as "covered products") 

include furnacesfboilers. vented home 

heating equipment, and pool heaters. 

the subject of today's document. 

Under the Act, the Program consists 

essentially of three parts: testing, 

labeling, and Federal energy 

conservation standards. The 

Department, in consultation with the 

1 Part B of title III of Energy Policy and 

Conservation Act. as amended. is refaned to in this 

final rule as the "Act". Part B of Title ill is codified 

at 42 U.S.c. 6291-6309. 

National Institute of Standards and 

Technology (formerly the National 

Bureau of Standards), is required to 

amend or establish new test procedures 

as appropriate for each of the covered 

products. Section 323. The purpose of 

the test procedures is to produce test 

results which measure energy 

efficiency, energy use. or estimated 

annual operating cost of a covered 

product during a representative average 

use cycle or period of use and must not 

be unduly burdensome to conduct. 

Section 323(b)(3). A test procedure is 

not required if DOE determines by rule 

that one cannot be developed. Section 

323(d)(1). One hundred and eighty days 

after a test procedure for a product is 

adopted, no manufacturer may represent 

the energy consumption of, or the cost 

of energy consumed by, the product 

except as reflected in tests conducted 

according to the DOE procedure. 

Section 323(c)(2). Test procedures 

appear at 10 Code of Federal 

Regulations, part 430, subpart B. 

However, the 180-day period referred 

to in section 323(c)(2) may be extended 

for a period of up to an additional 180 

days if the Secretary determines that the 

requirements of section 323(c)(2) WOi: ld 

imfc>se un'due burden. Section 

323(c)(3). Labeling requirements for 

major household appliances are 

administered by the Federal Trade 

Commi.ssion. 

Section 323{e) of the Act requires 

DOE to determine to what extent, if any. 

a proposed test procedure would alter 

the measured energy efficiency or , 

measured energy use of any covered 

product as determined under the 

existing test procedure. If DOE 

determines that an amended test 

procedure would alter the measured 

efficiency or measured energy use of a 

covered product, DOE is required to 

amend the related energy conservation 

standard accordingly. In determining 

the amended ste.ndard, DOE is required 

to measure the e!1ergy efficiency or 

energy use of representative samples of 

covered products which minimally 

comply with the existing standard. The 

average efficiency of these 

representative samples, tested using the 

amended test procedure, constitutes the 

amended standard. Sec"tion 323(e)(2). 

B. Background 

Today's document proposes to modify 

the test procedures for furnaces and 

boilers, vented home heating 

equipment, and pool heaters as follows: 

(1) DOE proposes to modify the test 

procedure for furnaces and boilers to 

incorporate waivers previously granted 

and to include test procedures for new 

product designs. The revised American 
EE-RM-93-501 COMMENT 00

Federal R.egister I Vol. 58. No. 161 I Monday. August 23. 1993 I Proposed Rules 44539 

National Standards Iristitutel American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 will be referenced. and test 

procedures will be included fOf 

atmospheric furnaces with burner air 

inlet dampers or flue dampers. jacket 

loss measurement for downflow 

furnaces. and electro-mechanical stack 

dampers with delayed opening and 

power vented units employing post 

purge during the off-cyde. Additionally. 

today's document establishes a 

minimum required blowef delay time 

between the ignition of the burner and 

the starting of the circulation air blower. 

a maximum on-time fOf the circulation 

air blower after the burner shut-off. and 

other corrections and technical 

revisions to those sections of American 

National Standards Institute! American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 incorporated into the OOE 

test procedure. Today's document also 

modifies the Energy Factor Descriptor to 

include the useful heat generated by the 

electrical consumption and establishes 

an additional new annual efficiency 

descriptor that includes the auxiliary 

electrical energy consumption of 

appliances when installed indoors and 

that could be used in determining the 

energy rating of mobile home furnaces. 

(2) OOE proposes to modify the test 

procedure for vented home heating 

equipment by establishing an additional 

new annual efficiency descriptor that 

includes the auxiliary electrical energy 

consumption in determining the energy 

rating of the appliance. and by 

including modified calculation 

procedures for the weighted average 

steady-state efficiency and Annual Fuel 

Utilization Efficiency for manually 

controlled heaters. (3) OOE proposes to 

modify the test procedure for pool 

heaters by establishing an additional 

new annual efficiellcy descriptor that 

includes the auxiliary electrical energy 

consumption in determining the energy 

rating of pool heaters. 

The above modifications of the test 

procedures for furnaces and boilers. 

vented home heating equipment. and 

pool heaters will not change the related 

existing energy conservation standards 

for these appliances. However. the 

Department has determined that 

additional new energy descriptors may 

need to be made available when it is 

found that the existing descriptors do 

not account for all of the energy or all 

types of energy consumed by an 

appliance. Not having these new energy 

descriptors would result in the analyses 

for energy conservation standards being 

incomplete and could lead to standards 

which could be met by utilizing 

unaccounted for energy that might 

satisfy an energy descriptor but result in 

little or no total energy savings. 

Examples of unaccounted for energy are 

the pilot light energy of a pool heeter 

which is not accounted for by the 

current energy descriptor of thennal 

efficiency or the electrical energy of a 

furnace or vented home heating 

equipment which is not accounted for 

by the current energy descriptor of 

Annual Fuel Utilization Efficiency. 

Accordingly. the Department is 

proposing in today's document to 

include new energy descriptors for 

vented hO,me heating equipment. 

furnaces. and pool heaters. 

II. Discussion 

A. Furnace Test Procedure 

On March 28. 1984. the Department 

published in the Federalltegister a final 

rule amending the test procedures for 

furnaces. vented home heating 

equipment. and unvented home heating 

equipment. (Hereafter referred to as the 

1984 Final Rule.) 49 FR 12148. 

The 1984 Final Rule referenced the 

American National Standards Institute! 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1982 entitled 

"Methods of Testing for Heating 

Seasonal Efficiency of Central Furnaces 

and Boilers." In addition. it prescribed 

test procedures for furnaces and boilers 

that were not covered adequately by the 

American National Standards Institutel 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1982. The 1984 

Final rule included provisions for 

modulating furnaces and boilers. 

condensing furnaces and boilers. units 

with thermal stack dampers. and other 

technical ravisions (including oversize 

factors of furnaces and boilers. furnaces 

without draft relief or direct exhaust 

system. hot water boiler specifications 

on minimum return inlet water 

temperature and minimum water 

temperature rise. pump delay boiler 

controls. improved method for the 

determination of the steady state stack 

to flue mass flow factor for furnaces and 

boilers. and option of an assigned jacket 

loss value in lieu of actual 

measurement). Subsequently. the 

Standards Project Committee 103 of 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers revised the American 

National Standards Institute! American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1982 to include DOE 1984 

amendments that were not covered 

adequately by the Standard. The 

resulting Standard. "Methods of Testing 

for Annual Fuel Utilization Efficiency of 

Residential Central Furnaces and 

Boilers." was designated American 

National Standards Institute! American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988. 

Since 1984. through cooperative 

efforts with the furnace industry and 

through OOE test procedure waiver 

process. OOE has become aware of 

several additional furnace test 

procedure issues. OOE proposes to 

amend the furnace test procedure to 

address these issues: 

1. American National Standards 

Institute! American Society of Heating. 

Refrigerating. and Air-ConditiQning 

Engineers Standard 103-1988 

American National Standards 

Institute! American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 which 

revised the earlier 1982 standard. is 

being referenced in Appendix N to 

subpart B of part 430 with certain 

exceptions in the present OOE proposed 

test procedure for furnaces. One 

exception concerns furnaces and boilers 

that include small air passages in the 

flue that serve a utility other than for 

draft relief (see section 3.9 of the 1984 

furnace test procedure and sections 

8.2.1.2.2 and 8.3.1.2.1 of American 

National Standards Institute!American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988). In DOE test procedure. the 

criterion for conSidering these units as 

direct exhaust systems is that air flow 

through the air passages shall not be in 

excess of 10 percent of the maximum 

steady-state total flue flow. In the 

American National Standards Institutel 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988. the 

criterion is that the area of the passage 

opening shall not be more than 10 

percent of the cross-~ectional area of the 

stack. The Department recognizes the 

difficulty and accuracy problems 

involved in the measurement of the air 

flow rate through the small air passage 

under the existing test procedure and is 

proposing to use the American National 

Standards Institutel American Society of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988 criterion. 

The 1984 Final Rule and the 

American National Standards Institute! 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 also differ 
EE-RM-93-501 COMMENT 00

44540 Federal Register I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 

with regard to the calculation procedure 

for units with an electro-mechanical 

stack damper. An error in the 

calculation procedure for the stack 

damper in American National Standards 

Institutel American Society of Heating. 

Refrigereting, and Air-Conditioning 

Engineers Standard 103-1988 

(discovered by the American Society of 

Heating, Refrigerating, and AirConditioning Engineers Standard 

Project Committee 103 after the 

standard was published) results in an 

overstated Annual Fuel Utilization 

Efficiency value. DOE is proposing to 

adopt a corrected calculation procedure. 

See Appendix N to Subpart B of part 

430. Section 7.6. and 10.7. 

A third difference between DOE 

current furnace test procedure and the 

American National Standards'Institutel 

American Society of Heating. 

Refrigerating. and Air~Conditioning 

Engineers Standard 103-1988 concerns 

air circulation blower delay, both during 

the heat-up test (delay in starting after 

burner ignition) and during the cooldown test (delay in stopping after 

burner shut-oCO. During the heat-up test. 

the DOE test procedure requires a 

blower time delay of 1.5 minutes with 

two exceptions. The American National 

Standards Institutel American Society of 

Heating, Refrigerating, and AirConditioning Engineers Standard 103-

1988 added a third exception: if the 

furnace is designed to operate with an 

unvarying time delay, the delay shall be 

as designed. During the cool-down test. 

the DOE test procedure allows a 3-

minute (1.5 minutes for condensing 

furnaces) delay in blower shut-off or 

until the supply air temperature drops 

below 40°F above the inlet air 

temperature, whichever results in the 

longer blower on time. The American 

National Standards Institutel American 

Society of Heating, Refrigerating, and 

Air- Conditioning Engineers Standard 

103-1988 added the additional 

exception that for furnaces without 

adjustable fan control. the delay shall be 

as designed. 

DOE is modifying both of these added 

exceptions in American National 

Standards Institute/American Society of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988 in the proposed test procedure. 

See appendix N to subpart B of part 430, 

sections 8.4, and 8.7. 

2. Furnaces and Boilers With Small Air 

Passage in the Flue 

The Department's current test 

procedure prescribes the ratio of the air 

flow rate through the small air passage 

to the flue gas rate through the stack (10 

percent) as the criterion in determining 

whether the unit is tested as a direct 

exhaust system. The American National 

Standards Institutel American Society of 

Heating, Refrigerating. and AirConditioning Engineers Standard 103-

1988 specifies the area ratio (10 percent) 

as the criterion. DOE recognizes the 

difficulty involved in measuring the air 

flow rate through the small passage, and 

is proposing to adopt the area ratio of 10 

percent (tested and accepted by the 

National Institute of Standards and 

Technology) as the appropriate 

criterion. 

3. Electro-mechanical Stack Dampers 

The DOE current test procedure for 

furnaces evaluates the effectiveness of a 

stack damper by comparing the area of 

the damper plate to the area of the stack. 

assuming instantaneous damper closing 

and without time delay after the burner 

is shut off. DOE realizes, however, that 

this simplified evaluation method likely 

results in overstatements of efficiency 

(this has been verified by National 

Institute of Standards and Technology 

experimentally). The calculation 

procedure in the American National 

Standards Institute/ American Society of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988 accounts for the time delay and 

specifies the finite length of time it takes 

for the damper to close. DOE is 

proposing to adopt this method for units 

with electro-mechanical stack dampers. 

See appendix N to subpart B of part 430. 

sections 7.6, and 10.7. . There was, however. an error as 

mentioned previously in the American 

National Standards Institutel American 

Society of Heating. Refrigerating, and 

Air-Conditioning Engineers Standard 

103-1988 calculation procedure. In the 

procedure. a stack damper effectiveness 

factor Do (defined as the ratio of the offcycle sensible loss with the damper in 

operation to the off-cycle sensible loss 

without the damper) was used to 

calculate the stack gas draft factor D •. 

The stack gas temperature measured 

with the damper open was used 

incorrectly in the numerator for the 

stack damper effectiveness Do. This can 

result in an overstatement of the Annual 

Fuel Utilization Efficiency by 1 to 2 

percentage points for a damper with a 

large leakage area and long delay time. 

The correct temperature should have 

been the calculated temperature with 

the damper in operation (determined by 

National Institute of Standards and 

Technology). The American National 

Standards Institutel American Society of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988 procedure also simplifies the 

calculation incorrectly by applying the 

factor Do to both the off-cycle sensible 

loss and off-cycle infiltration loss.a This 

simplification can result in an 

understatement of the Annual Fuel 

Utilization Efficiency by 0.2 to 1 

percentage point. depending on the 

damper leakage area and delay time. 

The correct procedure is the application 

of a separate stack damper effectiveness 

factor for infiltration loss. defined the 

same way as the factor Do for sensible 

loss, to the off-cytle infiltration loss 

calculation. DOE has included the 

corrected procedure to American 

National Standards Institutel American 

Society of Heating, Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 in this document. See 

appendix N to subpart B of part 4:l0. 

section 10.7. 

Both DOE current test procedure and 

the American National Standards 

Institutel American SOCiety of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 require 

geometrical measurements for the stack 

damper to be the cross-sectional area of 

the stack and the net area of the damper 

(area of damper minus any cut-out or 

holes). However, since there are 

dampers that when closed will permit 

air to leak around the edge and shaft of 

the damper. this leakage area should be 

included as part of the data required. 

DOE has included this requirement in 

today's proposal. See appendix N to 

subpart B of part 430, section 7.6. 

4. Thermal Stack Damper 

The 1984 Final Rule has no provision 

for direct measurement of off--cycle heat 

losses by measuring the concentration of 

a tracer gas in the flue and in the stack 

during an appropriate off-cycle period. 

The procedure for thermal stack 

dampers is not included in the 

American National Standards Institute/ 

American Society of Heating, 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988. The wide 

variation of performance of thermal 

stack dampers (such as sluggish closing 

time and variable leakage rate) requires 

a continuous measurement of the traCl'r 

gas concer.tration over the entire offcycle period (or discrete time 

measurements with small time steps). 

This. however. would introduce 

significant measurement errors in the 

beginning of the off-cycle period (when 

losses are the greatest) because of the 

rapid decrease in stack gas flow rate and 

temperature and slow response of tracer 

gas sensors and analyzers. Therefore, 

• "The Effect of a Time-Delayed Stack Damper 00 

Off-Cycle Heat Losses for Residential Heating 

Equipment," American Society of Heating, 

Refrigerating, and Air-conditioning Engineers 

Transactions 1983, V.89. 
EE-RM-93-501 COMMENT 00

Federal Register I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 44541 

DOE will continue to reserve the 

provision for thennal stack dampers 

pending development of testing details 

and a calculation procedure as 

discussed in the 1984 Final Rule. See 49 

FR 12148, March 28.1984. and 

appendix N to subpart B of part 430. 

section 10.28. 

5. Air Circulation Blower Delay at 

Burner Ignition 

The current furnace test pJ:OCadure 

requires a 1.S-minute delay between the 

ignition of the burner and the start-up 

of the blower. Since 1984. numerous 

manufacturers have requested. and OOE 

has granted, waivers from this 

requirement to accommodate the 

unvarying time delay designed into 

their units. The manufacturers' waivers 

include: Coleman Company, 50 FR 

2710, January 18, 1985; Magic Chef 

Company, 50 FR41553, October 11, 

1985; Rheem Manufacturing Company. 

53 FR 48574, December I, 1966, 56 FR 

2920. January 25, 1991.57 FR 10166, 

March 24. 1992. and 57 FR 34560. 

August 5,1992; Trane Company, 54 FR 

19226, May 4, 1989, 56 FR 6021. 

February 14. 1991, 57 FR 10167, March 

24. 1992. and 57 FR 22222, May 27. 

1992; Lennox Industries. 55 FR 50224. 

December 5, 1990; Inter-City Products 

Corporation. 55 FR 51487. December 14. 

1990. and 56 FR 63945. December 6, 

1991; DMO Industries. 56 FR 4622. 

February 5, 1991; Heil-Quaker 

Corporation, 56 FR 6019, February 14. 

1991; Carrier Corporation, 56 FR 6018. 

February 14. 1991. and 57 FR 38830. 

August 27, 1992; Amana Refrigeration 

Inc .• 56 FR 27958, June 18. 1991.56 FR 

63940, December 6.1991. and 57 FR 

23392. June 3. 1992; Snyder General 

Corporation. 56 FR 45960. September 9. 

1991; Goodman Manufacturing 

Corporation. 56 FR 51713. October 15. 

1991. and 57 FR 27970. June 23.1992; 

Ducane Company, 56 FR 63943. 

December 6,1991. and 57 FR 10163, 

March 24.1992; Armstrong Air 

Conditioning, Inc .• 57 FR 899, January 9, 

1992,57 FR 10160. March 24. 1992. 57 

FR 10161. March 24. 1992. and 57 FR 

39193. August 28.1992; ThenD{) 

Products, Inc., 57 FR 903. January 9, 

1992; and Consolidated Industries 

Corporation. 57 FR 22220. May 27. 

1992. The DOE granting of the waivers 

permitted those manufacturers to test 

units with blowers having unvarying 

time delay designed into them. Torlay's 

document incorporates this test 

provision for all furnaces and boilers. 

See appendix N to subpart B of part 430, 

section B.1. 

Because the designed delay time 

varies among units. DOE is proposing a 

specified minimum blower delay time 

of 20 seconds during the heat-up test if 

the designed unvarying delay time is 

less than 20 seconds. A cold draft would 

be created in the occupied zone if the 

blower is started too early. The 

Department's objective is to adopt a 

provision that allows all furnaces 

designed to operate with unvarying time 

delay to be rated in a manner that 

provides for a reasonable level of 

occupant comfort. Therefore. OOE is 

proposing a modification of American 

National Standards Institute! American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 {Section 9.6.1} to require a 

minimum blower delay of 20 seconds 

during the flue or stack gas temperature 

measurement portion of the heat-up test 

for furnaces designed with unvarying 

time delay. This requirement also would 

apply to the newer type of design for fan 

control where the time delay is 

adjustable by dip switch or jumper 

terminals. If the maximum time deley 

that can be selected is less than 20 

seconds, the control would be bypassed 

and the blower started manually 20 

seconds after the burner ignition for the 

heat-up test. 

6. Air Circulation Blower Delay at 

Burner Shut-off 

During the cool-down test. the current 

furnace test procedure allows a 3-

minute (l.5-minute for condensing 

furnaces) delay in blower shut-off or 

until the supply air temperature drops 

below 40°F above the inlet air 

temperature. whichever results in the 

longer blower on time. American 

National Standards Institute/American 

Society of Heating, Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 provides an additional 

exception (section 9.5.1.2.2) that for a 

furnace without adjustable fan control. 

the delay shall be as designed. 

Therefore. to increase the Annual Fuel 

Utilization Efficiency value (which does 

not include auxiliary electrical energy 

consumption in its calculation). some 

furnaces could be designed with 

unvarying blower time delay longer 

than 3 minutes and less than 40°F 

temperature difference. resulting in a 

cold draft in the occupied zone. 3 

Again, OOE objective is to adopt a 

provision that allows all furnaces 

designed to operate with unvarying time 

delay to be rated in a manner that 

provides for a reasonable level of 

3 [n addition. the electrical energy consumed in 

running the'blower for a longer time may be monI 

than the beat energy recovecsd from the furnace 

heat exchangers. This will be true especially if the 

source energy used to generate the electricity is 

considered rather than the electrical energy at the 

building Jim. 

occupant comfort. Therefore. OOE is 

proposing a modification of .American 

National Standards Institute I American 

Society of Hasting. Rafrigerating, and 

Air-Conditioning Engineers Standard 

103-1988 (Section 9.5.1.2.2) to require 

furnaces with unvarying time delay that 

do not allow for the blower delay time 

specified (3 minutes for noncondensing or 1.5 minutes for 

condensing furnaces or until the supply 

air temperature drops to 8 temperature 

of 40°F above the inlet air temperature. 

whichever gives the longer blower on 

time) to be tested with the fan control 

bypassed and the blower manually 

controlled to give the delay time 

specified during the cool-down test. 

This requirement also would apply to 

the newer type of fan control designs 

where the adjustment is by dip switches 

or jumper terminals and the range of 

adjustment does not allow for the delay 

time specified. See appendix N to 

subpart B of part 430. section 8.4. 

The Department also is proposing an 

exception to the delay time requirement. 

specified above. for blower start-up and 

shut-off of furnaces that employ a single 

motor to drive the power burner and the 

blower. In that case, the power burner 

and the blower would be started and 

stopped at the same time. The current 

furnace test procedure includes this 

type of exception for burner and blower 

start-up during the heat-up test. 

7. Burner Box Inlet Damper and Flue 

Damper 

For non direct vent furnaces with 

power burners. a value of 0.4 for the 

theoretical off-cyc1e flue draft factor {Del 

is assigned for use in the computation 

for off-cycle sensible and infiltration 

losses. For non direct vent units with 

atmospheric burners. the existing test 

procedure and the American National 

Standards Institute/American Society of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988 assign a Dc value of 1.0 and no test 

measurement for this factor is allowed. 

However. optional tracer gas procedure 

to determine a possible lower Dr value 

is allowed for direct vent units and 

pOW8r burner units. Since Dr is a factor 

in the calculation for off-cycle losses. a 

smaller Of will decrease the calculated 

losses and thus increase the Annual 

Fuel Utilization Efficiency. 

On August 1. 1989. Lennox Industries 

(Lennox) filed a "Petition for Waiver" 

and an "Application for Interim 

Waiver" seeking DOE approval to use 

the existing optional tracer gas method 

to determine a 10w8r than assigned I)p 

value for its G20 and G20R series of 
EE-RM-93-501 COMMENT 00

44542 Federal Register I Vol. 58, No. 161 I Monday, August 23. 1993 I Proposed Rules 

atmospheric furnaces." The design of 

these units included an integral draft 

diverter and an electro-mechanical 

burner box inlet damper which closes 

off the combustion air inlet to the heat 

exchanger during the off-cycle. Lennox 

stated that restriction to the air flow 

through the heat exchanger by the 

closed damper during the off-cycle 

caused the draft factor!)p to be less than 

1.0. resulting in reducad off-cycle 

losses. Lennox claimed that absent &n 

alternative test method for !)P the 

assigned value of 1.0 would result in a 

lower Annual Fuel Utilization 

Efficiency value and an unfair rating for 

its G20 and G20R series of atmospheric 

furnaces. 

The optional tracer gas method 

requested by Lennox specified that for 

a unit with an integral draft diverter for 

draft relief, the cool-down test and the 

tracer gas test (which is conducted 

during the cool-down test) be conducted 

with the diverter sealed and the stack 

restricted. 

Several comments argued that if the 

tracer gas method was used. the test 

should be conducted with the diverter 

open as this is the way the furnace 

would operate in field installations.s If 

the divsrter was kept open during the 

test. aspiration hy draft relief air flowing 

through the diverter opening into the 

stack could increase the air flow 

through the heat exchanger thereby 

reducing the inlet damper effectiveness 

and increasing the value of!)p. A sealed 

diverter would prevent this aspiration 

motion from happening. resulting in a 

lower DF value. Another view held that 

for some atmospheric furnacas. the !)p 

value was found to be less than 1.0 

when tested by the tracer gas method 

even when there was no inlet damper. 

This would automatically result in an 

increase in furnace Annual Fuel 

Utilization Efficiency caused solely by 

utilizing testing to obtain !)p and not by 

installation of an inlet damper. 

The comments raised questions on the 

potential effect on industry product 

design and manufacturing. Therefore. 

DOE directed the National Institute of 

Standards and Technology to conduct 

efficiency tests of a Lennox G20 furnace 

using tracer gas tests to determine !)p. 

The test results showed that the Lennox 

• DOE published the Lennox petition in the 

Federal R.egister and solicited comments. date. and 

information respecting the petition and granted the 

requested Interim Waiver in its entirety. (54 FR 

50525. December 7.1989). 

• Comments on the petition were received from 

manufacturers. trade assoctetions. Stete government 

agencies. public interest groups. and utility 

companies. A complete list and a summary of the 

comments received are included in the DOE 

Decision and Order of December 5. 1990 (55 FR 

50224. December 5.1990). 

furnace had lower off-cycle losses and a hi~er Annual Fuel Utilization 

Efficiency value when the inlet damper 

was operating as designed than when 

the inlet damper was held open during 

the off-cycle. National Institute of 

Standards and Technology also found 

air-flow entering the heat exchanger 

through the diverter opening when 

testing was conducted with the diverter 

open during cool-down. This air-flow 

went down one section of the clamshell 

heat exchanger and came up another 

section of the clamshell heat exchanger 

into the stack. Therefore. an open 

diverter provided a second air passage 

(in addition to the one through the 

closed burner box inlet port) for the cold 

air to enter and cool down the heat 

exchanger. 

Based on the test results and the 

comments received regarding methods 

to test the draft factor. DOE developed 

a modified version of the existing tracer 

gas test method to obtain an off-cycle 

loss factor (KtJ that can be used to 

calculate the off-cycle losses of the 

Lennox furnace. The modified method 

has two requirements: (1) That the tracar 

gas test be performed with the draft 

diverter open; and (2) that the test be 

performed with the inlet damper open 

as well as closed to obtain a ratio of the 

two off-cycle losses during the off-cycle 

(loss with inlet damper closed to loss 

with inlet damper open) for use as the 

off-cycle loss factor. The latter 

requirement ensures that only the 

relative improvement in the !)p value is 

allowed. 

During testing. National Institute of 

Standards and Technology found the 

tracer gas test. as specified in the 

current optional method. difficult to 

perform in the heat exchanger as was 

calculating an integrated off-cycle loss. 

National Institute of Standards and 

Technology reported that a continuous 

measurement of the tracer gas 

concentration over the entire off-cycle 

period was difficult to perform 

accurately due to the rapidly changing 

nature of the gas flow at the beginning 

of the off-cycle. National Institute of 

Standards and Technology also found 

that measurements conducted in the 

heat exchanger and in the test stack gave 

similar results in the off-cycle loss 

value. In addition. the ratio of the losses 

calculated over the entire off-cycle 

period was close to the ratio calculated 

by using the integrated losses over a 1-

minute interval beginning 5 minutes 

into the off-cycle where the rate of 

change of the gas flow was more stable. 

This is the same rationale used in the 

current optional procedure where 

measurement of the tracer gas at 

between 5 to 6 minutes into the offcycle is used to compute the !)p value. 

Therefore. the modified method 

requires: (1) That the tracer gas be 

injected and sempled in the stack 

instead of in the heat exchanger; and (2) 

that the 1-minute (between minutes 5 

and 6 into the off-cycle) integrated 

values of the two off-cycle losses 

(measured with the inlet damper closed 

and open during the off-cycle) be used 

to calculate the off-cycle loss factor. The 

Department specified the modified 

tracer gas procadure in its December 

1990 Decision and Order granting 

Lennox a waiver for its G20 and G20R 

series furnaces. 8 

The Department is including the 

modified procedure in today's proposal 

for the measurement of an off-cycle loss 

factor KL for atmospheric furnaces 

requiring draft relief and designed with 

an electro-mechanical burner box inlet 

damper or an electro-mechanical flue 

damper installed upstream of the draft 

relief device. See appendix N to subpart 

B of part 430. sections 7.5. 8.9. and 

10.16. 

A large portion of the off-cycle losses 

occur in the first minute after the burner 

shuts off. and a slow closing damper 

will lose most of its effectiveness. 

Therefore. DOE also is proposing that 

the method be applicable only when the 

damper closes completely within 10 

seconds after the burner shuts off. 

The Department also is proposing 

revisions to Table 6 in American 

National Standards Institutel American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 for system numbers because 

of the inclusion of the tracer gas 

procedure for atmospheric furnaces 

with inlet or flue dampers in today's 

proposed test procedure. These 

revisions consist of adding burner inlet 

damper or flue damper characteristics. 

DF and Ds values. and are found in 

proposed table 1 of appendix N to 

subpart B of part 430. section 7.3. 

8. Power Vented Systems Employing 

Post Purge After Burner Shut-Off 

The current test procedure and the 

American National Standards Institutel 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 allow the 

optional tracer gas test method to be 

used to determine off-cycle power 

burner draft factor (Op) for power vented 

burners. The procedure specifies that 

between 5 to 6 minutes into the cooldown period. a one-time measurement 

• A detailed discussion of the NlST test results 

and the rationale for adopting a modified (tracer gas test proce<iure is included in the DOE December 

1990 Decision and Order). (55 FR 50224. December 

5.1990). 
EE-RM-93-501 COMMENT 00

Federal Register I Vol. 58. No. 161 I Monday. August 23. 1993 I Proposed Rules 44543 

be made on the concentration of the 

tracer gas in the flue gas and of the gas 

temperature. and the mEJasured data 

used to calculate the off-cycle flue gas 

flow rate and the power burner draft 

factor I)p. 

The assumption used to derive the 

calculation procedure is that the flue gas 

temperature decreases exponentially 

and smoothly by natural convective 

flow starting when the burner is, shut 

off. In order to vent combustion product 

residue in the heat exchanger of some furnaces or boilers. the combustion 

blower (forced or induced draft) 

continues to run for a short period of 

time after the burner is shut off. This 

action is referred to as post purge. For a short post-purge period (less than 5 

seconds). the additional loss caused by 

the forced convective flow of the flue 

gas is so small Ulat it is considered 

negligible. When this post-purge period 

is long. as is the design of some units. 

the additional losses are large. However. 

such additional losses are not reflected 

in the current procedure. Actually. the 

longer the post-purge period. the 

smaller the calculated losses by the 

current tracer gas method. The off-cycle 

flue gas temperature TF.oFF measured 

between 5 to 6 minutes into the offcycle decreases faster with longer post 

purge because of the additional cooldown effe:ct of the forced air flow during 

post purge. The net effect is that units 

with long post-purge time receive an 

Annual Fuel Utilization Efficiency 

rating that is higher than it should be, 

To correct this deficiency in the 

current test procedure. OOE directed 

National Institute of Standards and 

Technology to conduct tests on a power 

vented furnace employing post purge 

and to develop a correction procedure to 

the current tracer gas method. The test 

results 7 indicated that during the postpurge period. flue gas temperature 

decreased in an approximately linear 

fashion and that the mass flow rate 

increased from its steady-state value 

because the decreasing temperature 

increased the flue gas density. The flue 

gas temperature resumes the 

exponential decreasing pattern after the 

post-purge period. 

Based on the test results. OOE is 

proposing to modify the test procedure 

by separating the calculations into two 

parts. During the post-purge period. the 

flue gas temperature is assumed to 

decrease linearly. and the volume flow 

rate of the combustion blower is 

assumed constant and equal to the value 

when the bUrner is on. The density of 

the flue gas is assumed to follow the 

7 National Institute of Standards and Technology 

Interagency Report 4908, August 1992. 

Ideal Gas Law in the calculation for the 

mass flow rate of the flue gas. Based on 

these a~sumptions. the off-cycle losses 

can be determined analytically. In this 

way. the losses during the post-purge 

period can be determined by taking the 

flue gas temperature data at the 

beginning and end of the post-purge 

period. The first temperature i$ the same 

as the steady-state temperature. 

therefore. only one additional 

temperature is required. During the 

remaining period of the off-cycle (after 

post purge). the current tracer gas test 

and calculation procedures are used. 

The modification would require the 

tracer gas concentration and 

temperature data to be taken between 5 

to 6 minutes following the end of the 

post-purge period. The off-cycle time for 

this part of the calculation is equal to 

the regular average burner off-time (13.3 

minutes for single stage furnace. 33.26 

minutes for single stage boiler. 10 

minutes for modulating furnaces and 15 

minutes for modulating boilers) minus 

the length of the post-purge period. The 

I)p value determined by the tracer gas 

method is used to calculate the off-cycle 

losses in percent of energy input during 

this period (after post purge). The losses 

from the two periods are totaled to 

arrive at the Annual Fuel Utilization 

Efficiency value. See appendix N to 

subpart B of part 430. sections 10.B. 

10.10.2. and 10.11.2. 

Therefore. OOE is proposing to revise 

the current test procedure to require that 

the length of the post-purge period tp 

and the flue gas temperature at end of 

the post-purge period to be recorded. 

See appendix N to subpart B of part 430. 

sections 8.2. and 8.5. 

9. Jacket Loss Test and Insulation 

Requirement for Downflow Furnaces 

Neither the current OOE test 

procedure nor the American National 

Standards Institutel American Society of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988 specify a jacket loss test for 

down flow furnaces. In its certification 

program. the Gas Appliance 

Manufacturers Association requires that 

when conducting a jacket loss test on 

downflow furnaces. if the manufacturer 

has not supplied the internal section of 

vent pipe connecting the flue collar to 

the top of the unit to be tested. the 

appropriate piece of uninsulated vent 

pipe shall be installed by the testing 

facility. The Department accepts this 

approach and has included it in today's 

proposal. See appendix N to subpart B 

of part 430. section 6.4. 

10. Blower Compartment Heat Loss 

During Jacket Loss Test 

The current OOE test procedure and 

the American National Standards 

Institutel American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 do not 

specify whether the furnace air 

circulation blower compartment is 

considered part of the cabinet or part of 

the duct system. In 1990. SPC 103 

recommended that the blower 

compartment be considered as part of 

the duct system and that no 

temperatures be recorded during the 

jacket loss test. OOE agrees with that 

specification and has included it in 

today's proposal. See appendix N to 

subpart B of part 430. section 7.2. 

11. Sealing of Ventilation Openings 

During Jacket Loss Test 

Neither the.OOE test procedure nor 

the American National Standards 

Institute/American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 specifies 

a procedure for dealing with the heat 

loss of air flowing from the louvered 

ventilation opening on the top. front. or sides of the unit cabinet during the 

jacket loss test. Therefore. the beat loss 

is unaccounted for during the test. The 

measurement of this convective heat 

loss is difficult to perform with the 

current flow measurement technique 

because of the low air-flow rate and 

temperature difference. OOE believes. 

however. that heat loss by convective air 

flow through the ventilation openings 

may be significant. This heat loss can be 

reduced to a minimum during the jacket 

loss test by taping or sealing with 

aluminum tape those ventilation 

openings from which the ventilation air 

exits from the cabinet. OOE is proposing 

that such taped areas be divided into the 

normal 36 square inch grids and that 

thermocouples be installed in each 

square, over the tapes if necessary. to 

measure the temperatures over the taped 

area. A smoke test during a short steadystate test may be used to determine the 

openings where the ventilation air exits 

from the cabinet. This would prevent 

the blocking of the louvered openings 

where combustion air enters. The taping 

also would apply to down flow furnaces. 

No taping of louvers in the jacket would 

be required for other parts of the test 

procedure. and the tapes would be 

removed after the completion of the 

jacket loss test. DOE is proposing the 

above sealing procedure in today's 

document. See appendix N to subpart B 

of part 430. section 7.2. 
EE-RM-93-501 COMMENT 00

44544 Federal Register I Vol. 58, No. 161 I Monday. August 23. 1993 I Proposed Rules 

12. Insulation Requirement for Units 

With Draft Diverter 

Both the current OOE test procedure 

and the American National Standards 

Institute! American Society of Heating. 

Refrigerating, and Air-Conditioning 

Engineers Standard 103-1988 require 

the insulatiQn of an integral draft 

diverter with a minimum of R-7 

insulation material for the cool-down 

and heat-up tests. In 1991. ETL Testing 

Laboratories. Inc. suggested that when 

testing units with integral draft 

diverters. which are mounted in an 

exposed position (not inside the overall 

cabinet), the diverters should be 

considered part of the vent pipe and be 

insulated to reduce heat loss (as is the 

test stack) before starting any test 

including the jacket loss test and the 

steady-state test. ETL Testing 

Laboratories. Inc. uses this process 

when testing furnaces for the Gas 

Appliance Manufacturers Association 

efficiency rating certification program. 

OOE agrees with ETL Testing 

Laboratories, Inc.·s recommendation 

and is proposing such a provision in 

today's document. See appendix N to 

subpart B of part 430. sections 6.2. 6.5, 

and 6.6. 

13. Insulation Requirement for Flue 

collector Box 

Both the OOE test procedure and 

American National Standards Institutel 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 require 

that the draft diverter and the flue gas 

collection box for units with integral 

draft diverter be insulated with no less 

than R-7 insulation material before the 

start of the cool-down test. This is to 

reduce heat loss and to obtain a more 

accurate flue gas temperature at the test 

plane. where the flue gas temperature is 

measured during cool-down and heatup test. 

This requirement is not specified for 

the flue collector box in units with 

power burners. The Department. 

however. believes that the same 

insulation requirement on the flue 

collector box should apply since the test 

plane for temperature measurement for 

power burner units is the same as for 

units with draft diverter. Therefore. 

OOE is proposing the same insulation 

requirement (during cool-down and 

heat-up tests but not during jacket loss 

and steady-state tests) on flue collector 

box for power burner units. See 

appendix N to subpart B of part 430. 

section 6.3. 

14. Piping Arrangement for Hot Water 

Boilers 

Based on data provided by the 

Hydronic Institute to Standard Project 

Committee 103. an error was identified 

in the schematic figure for piping 

arrangement for hot water boilers in the 

American National Standards Institute! 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 (Figure 6) 

and in the OOE test procedure. The 

error was in the recirculation line which 

was shown as connected to the return 

side of constant head tank instead of 

connection to the supply side of the 

tank. DOE concurs with the Hydronic 

Institute and is including the revised 

schematic for hot water boilers in 

today's proposed amendments. See 

appendix N to subpart B of part 430. 

section 6.7. 

15. Minimum Value for I)p and l)p 

The current test procedure allows the 

minimum value for Dp and l)p to equal 

0.0 on units where no air flows through 

the combustion chamber and heat 

exchanger when the burner is off. 

American National Standards Institute! 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 sets the 

minimum value at 0.00001. Current 

measurement techniques preclude an 

accurate tracer gas test on units with a 

low off-cycle air flow rate. Therefore. it 

is very difficult to verify an "absolutely 

no air-flow" condition (this has been 

confirmed by National Institute of 

Standards and Technology). 

Accordingly. OOE proposes that a value 

of 0.05 for Dp be assigned for any units 

whose I)p value. when measured by the 

optional tracer gas method. is less than 

0.10. See appendix N to subpart B of 

part 430. sections 7.4.3, 8.8.3. 8.10. and 

10.15. 

16. Maintaining Draft During Off-Cycle 

American National Standards 

Institute! American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 requires 

that a draft be maintained in the flue 

pipe for furnaces and boilers with oilfueled or power gas burners. The 

Department proposes to clarify this 

requirement by specifying that it applies 

only to oil-fueled or power gas burners 

that employ barometric dampers for 

draft control. See appendix N to subpart 

B of part 430. sections 6.8. 8.3. and 8.6. 

17. Test Requirements for Modulating 

Units 

The OOE current test procedure 

requires that testing and calculation 

procedures for cyclic tests (cool-down 

and heat-up) be conducted at both the 

maximum and the reduced input rates 

for units with two-stage modulating 

controls and at the reduced input rate 

for units with step modulating controls. 

American National Standards Institute! 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 specifies 

the same calculation procedures but is 

unclear (in sections 11.4 and 11.5)&s to 

the type of tests to be performed and the 

test results to be used in the calculations 

that follow. The SPC 103 has 

recommended limiting values for the 

terms Te. Effys •. M and 0wt.M and the 

conditions under which these limits 

apply. OOE today is proposing such 

recommendations to the applicable 

sections. See appendix N to subpart B 

of part 430. sections 10.13. and 10.14. 

The Department also is proposing to 

clarify the requirement for determining 

the draft factors I)p and l)p for units with 

modulating control. To be consistent 

with other cyclic test requirements. OOE 

proposes that the optional tracer gas 

procedure be conducted at both the 

maximum and the reduced input rates 

for units with two-stage controls and at 

the reduced input rate for units with 

step modulating controls. See appendix 

N to subpart B of part 430. section 8.8.4. 

18. On-cycle Time Constant and Offcycle Time Constant 

In the current caleulation procedure. 

both the on-cycle and off-cycle time 

constants use equations involving the 

logarithm of measured temperature 

difference at two specified time 

intervals. In testing some units. it is 

possible that the two temperatures will 

be close enough to cause a negative 

argument in the logarithm function and 

subsequent computation failure. To 

prevent this occurrence. the SPC 103 

recommended a correction procedure 

specifying that when the temperatures 

difference is negative. the difference 

between the two temperatures be set to 

equal 0.1. OOE agrees with the 

correction procedure and is proposing it 

in today's document. See appendix N to 

subpart B of part 430. sections 10.3. and 

10.4. 

19. Multiplication Factor for Jacket Loss 

for Finned Tube Boilers for Isolated 

Combustion System 

The Standard Project Committee 103 

recommended the addition of the value 

CJ=0.5 as the multiplication factor jacket 

loss for finned tube boilers for Isolated 

Combustion System applications. This 

is consistent with the values of CJ 

assigned for other systems when 

installed as outdoor systems and as 

Isolated Combustion !lystem. OOE 
EE-RM-93-501 COMMENT 00

Federal Register I Vol. 58, No. 161 I Monday, August 23. 1993 I Proposed ,Rules 44545 

accepts the recommendation and is 

including it in today's proposal. See 

appendix N to subpart B of part 430, 

section 10.12.1.2. 

20. Water Pump Energy Consumption 

For hot water boilers. American 

National Standards Institutel American 

Society of Heating, Refrigerating, and 

Air-Conditioning Engineers Standard 

103-1988 assigns a constant value for 

water pump power (BE=O.13 KW) and 

no test measurement is required or 

allowed. This value is based on the 

average power consumption of water 

pumps shipped with boilers in 1978. To 

increase the accuracy of the energy 

deScriptors, annual efficiency 

descriptors, and energy factor, which 

include electrical energy consumption 

and to capture the variability in pump 

efficiencies available for use with 

boilers. OOE today is proposing a test 

method which requires measuring the 

power consuinption of the water pump 

used with the hot water boiler. This 

power consumption is used in the 

calculation of the energy descriptors. 

annual efficiency descriptors, and 

energy factor. See appendix N to subpart 

B of part 430. section 8.1.1. 

21. Energy Factor 

The current OOE test procedure 

includes a procedure for computing the 

annual auxiliary electrical energy 

consumption of fossil-fuel furnaces and 

boilers and an e~nergy factor which 

includes both the fossil fuel and the 

auxiliary electrical energy consumption 

of the appliances. Specifically, "energy 

factor" is defined in the OOE test 

procedure as the ratio of the annual 

output of energy delivered to the heated 

space by fossil fuel to the total annual 

energy input to the appliance including 

auxiliary electrical energy. Appendix B of American National 

Standards Institutel American Society of 

Heating. Refrigerating, and AirConditioning Engineers Standard 103-

1988 defines "energy factor" in equation 

(1). Equation (1) is defined for an energy 

factor term which gives credit for the 

electrical energy that is recovered as 

usable heat such as from a blower motor 

in the circulating air stream. In addition. 

a factor F. representing the ratio of the 

heat energy required to generate the 

electricity consumed to the useful heat 

energy delivered at the appliance by the 

electricity is applied to the auxiliary 

electrical consumption to reflect the 

efficiency of all energy used to run the 

appliance. OOE considers equation (1) 

in American National Standards 

Institute! American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 to be 

appropriate for describing the energy 

factor of the appliance when both fossil 

fuel and auxiliary electrical energy 

consumption are considered together. 

Therefore. OOE proposes to adopt 

equation (1) in Appendix B of American 

National Standards Institute! American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 and the accompanying 

procedure in Appendix C for isolated 

combustion systems as the energy 

factor. Three slight modifications are 

included in the procedure presented 

here. Those are: American National 

Standards Institute! American So8iety of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988 equation (1) is corrected-divide 

Annual Fuel Utilization Efficiency term 

by 100 and multiply the right side of the 

equation by 100. the extra energy 

consumed by the combustion blower 

during post-purge is included in the 

calculation. and the energy consumed 

by the electrical intermittent or 

interrupted ignition device. if 

employed. is also included in the 

calculation of the energy factor. See 

appendix N to subpart B of part 430. 

Sections 10.19 and 10.21. 

22. Annual Efficiency Descriptor 

Since Annual Fuel Utilization 

Efficiency is defined in the Act in terms 

of an isolated combustion system. OOE 

believes that an additional energy 

descriptor. comparable to Energy Factor. 

is needed for those furnaces and boilers 

which are primarily installed indoors. 

For example. practicaUyall mobile 

home furnaces are installed indoors and 

there are steps that could be taken to 

obtain a higher Annual Fuel Utilization 

Efficiency or Energy Factor. such as 

adding jacket insulation. which would 

have no impact on the actual efficiency 

of a furnace installed indoors. Because 

of the above, the Department proposes 

an additional new energy descriptor. 

annual efficiency deScriptor. for those 

classes of furnaces which are installed 

indoors. See appendix N to subpart B of 

part 430. sections 10.20 to 10.26. 

OOE proposes to adopt equation (1) in 

Appendix B of American National 

Standards Institutel American Society of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988 and the accompanying procedure 

in Appendix C for indoor installations 

as the Annual Efficiency. Again three 

slight modifications are included in the 

procedure presented here. Those are: 

American National Standards Institute! 

American Society of Heating. 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988 equation 

(1) is corrected-divide Annual Fuel 

Utilization Efficiency term by 100 and 

multiply the right side of the equation 

by 100, the extra energy consumed by 

the combustion blower during post- . 

purge is included in the calculation, and 

the energy consumed by the electrical 

intermittent or interrupted ignition 

device. if employed, is also included in 

the calculation of Annual Efficiency. 

The calculation of annual effiCiency 

descriptor involves the determination of 

the heating seasonal efficiency and the 

Annual Fuel Utilization EffiCiency 

based on an outdoor installation for all 

weatherized furnaces or boilers and 

based on an indoor installation for all 

non-weatherized furnaces or boilers. 

This is different from the existing 

requirement for non-weatherized 

furnaces where heating seasonal 

effiCiency and Annual Fuel Utilization 

Efficiency are calculated on the basis of 

installation as an Isolated Combustion 

System. In today's proposal. the Annual 

Fuel Utilization Efficiency for nonweatherized furnaces is still based on an 

Isolated Combustion System system. 

Since the indoor values of the heating 

seasonal effiCiency and Annual Fuel 

Utilization Efficiency need to be 

calculated and used to determine the 

AE. two sets of values for heating 

seasonal efficiency and the Annual Fuel 

Utilization Efficiency {one for the rating 

of the system based on Annual Fuel 

Utilization Efficiency (Isolated 

Combustion System) and the other for 

the annual efficiency descriptor (indoor 

system) need to be calculated. OOE 

believes that, with the calculation 

procedure computerized,8 the effort 

involved in computing the two sets of 

values is insignificant since the same 

test data are used in the calculation and 

no additional test is required. 

Specifically, the only changes between 

the two computer runs are the indices 

(codes) which specify the installation 

location and the system number. 

The major difference between the 

Annual Fuel Utilization Efficiency and 

the Annual Efficiency will be the 

inclusion of the auxiliary electrical 

energy in the calculation for the annual 

efficiency term and the application of 

the F factor (the ratio of the energy 

consumed at the source of electrical 

generation to the electrical energy 

delivered at the furnace or boiler) to the 

electrical energy term in the 

denominator. Because of this. the value 

of the Annual Efficiency will be 

noticeably smaller than the 

corresponding Annual Fuel Utilization 

• National Institute of Standards and Technology 

Annual Fuel Utilization Efficiency-BF version 4.0 

computer program. 
EE-RM-93-501 COMMENT 00

44546 Federal Register / Vol. 58, No. 161 I Monday, August 23, 1993 / Proposed Rules 

Efficiency value, which includes only 

fossil fuel energy in its calculation. 

23. Other Minor Modifications to 

American National Standards Institute/ 

American Society of Heating. 

Refrigerating, and Air-Conditioning 

Engineers Standard 103-1988 

DOE also is proposing to adopt 

corrections and clarifications of several 

typographical errors and inconsistencies 

identified by Standard Project 

Committee 103 following publication of 

American National Standards Institutel 

American Society of Heating, 

Refrigerating, and Air-Conditioning 

Engineers Standard 103-1988. The 

following are the listing of these 

modifications, referring to section 

numbers of American National 

Standards mstitute/ American Society of 

Heating, Refrigerating. and AirConditioning Engineers Standard 103-

1988: 

1. Section 8.8.2.2.-Delete the two 

words "flue or" in the first line. 

2. Section 9.7.3.-Delete the phrase "if 

draft is not maintained during the 

cool-down" in the second sentence. 

3. Section 10.-Revise the definitions 

for the variables Me and Qc to: 

Me=Mass of condensate, Ib 

Qc=fuel energy input during entire (3 

or 6 cycles) cyclic condensate 

collection test, Btu 

4. Section 11.2.4.-Delete the three 

words "oil or power" in the first 

sentence of the second paragraph. 

Also, replace the third paragraph with 

"For direct exhaust gas or oil furnaces 

and boilers, S/F=l." 

5. Section 11.2.6.-Add missing right 

closing bracket in Table 7 for L..ss. 

6. Section 11.2.9.9.-Correct the 

definitions for ~for different systems 

to be consistent with the tabulated 

values of System No. versus ~ in 

Table 6. Also, correct the constant 

term 0.75 in the definition for Ds to 

0.79 for systems 4 and 8. 

7. Section 11.2.9.14.-Correct the 

section numbers which were 

referenced in the definitions for '!IF.O.X 

(corrected from 11.2.9.5. to 11.2.9.7.) 

and '!IF.O.X (corrected from 11.2.9.7. to 

11.2.9.5.). 

8. Sectior. 11.2.9.16.-Change the 

system numbers from 9-12 to 9-10. 

9. Section 11.2.10.6.-Correct the 

referenced section number in the 

definition for the variable F6 from 

11.2.9.18. to 11.2.9.19. 

10. Sections 11.4.8.5., 11.4.8.8 .• and 

11.4.8. 10.-Set the minimum default 

values for the terms Tc (if Tc<O, set 

Tc:='O). Effyss.M (if QOUT.R>DHR. set 

Effyss.M=EffyssR), and QoUT.M (IF 

Qom.R>DHR. QoUT,M=QOUT.R) as 

recommended by American Society of 

Heating. Refrigerating, and Airconditioning Engineers Standard 

Project Committee 103. 

11. Section 11.7.2.-Delete equation 

Ds=(Oo}(Op} for system number 8 and 

substitute Ds=[(0.79+Op)/1.4] (00). 

12. AppendiX E of American National 

Standards mstitute/ American Society 

of Heating. Refrigerating. and AirConditioning Engineers Standard 

103-1988-Correct the typographical 

errors in the defining equations for 

the variables F5, F6. and F8 where a 

constant term "+ 28" was missing 

from a term in the denominator of the 

equations as they appeared in 

Appendix E. See Section 10.27 and 

Table 2 of the proposed test procedure 

for details of the corrected terms of 

the equations. . 

B. Vented lfome Heating Equipment 

Test Procedure 

The Department published the test 

procedure for vented home heating 

equipment on May 2,1:978.43 FR 

20182. DOE amended this test 

procedure on March 28, 1984. 49 FR 

12169, to include a simplified 

procedure for heaters with modulating 

controls. man~lally controlled vented 

heaters. vented heaters equipped with 

thermal stack dampers. and floor 

furnaces. 43 FR 20182. 

DOE today proposes to amend the 

vented heating equipment test 

procedure: (1) To establish an annual 

effiCiency descriptor to account for the 

auxiliary electrical energy consumed by 

the fan or blower in addition to the 

fossil fuel consumed; (2) to revise the 

calculation procedure for Annual Fuel 

Utilization Efficiency; and (3) to revise 

the calculation procedure for weighted 

average steady-state effiCiency for 

manually controlled heaters with 

various input rates. 

1. Annual Efficiency Descriptor 

DOE determined that an additional 

new energy descriptor is needed to 

adequately address the energy used by 

some of the design options considered 

for energy standard level evaluation 

because the current energy descriptor. 

Annual Fuel Utilization Efficiency. does 

not include electrical consumption. For 

example. design options, such as adding 

an induced draft fan. improve thermal 

efficiency but. at the same time. add 

electrical consumption which unless 

accounted for in the energy descriptor 

could lead to higher Annual Fuel 

Utilization Efficiency with little or no 

net energy savings. Therefore. the 

Department is proposing a new energy 

descriptor. Annual Efficiency (AE). See 

appendix 0 to subpart B of part 430. 

section 4.6. 

The Department's current test 

procedure for vanted home heating 

equipment prescribes the calculation of 

the Ar,nual Fuel Utilization Efficiency 

based on the energy consumption of 

fossil fuel only. Since auxiliary 

electrical energy is consumed by the 

appliances for the operation of the fan 

or blower. DOE believes a more 

appropriate term for evaluating the 

efficiency of the appliances would 

include both the fossil fuel and the 

auxiliary electrical energy consumption 

of the appliances. 

American National Standards 

Institutel American Society o{Heating, 

Refrigerating. and Air-Conditioning 

Engineers Standard 103-1988. appendix 

B and appendix C, includes calculations 

for energy factor which uses both the 

fossil fuel and the auxiliary electrical 

energy consumed by the appliance. It 

also gives credit for the electrical energy 

that is recovered as usable heat as is the 

case of a blower motor that is in the 

circulating air stream. In addition, a 

factor F. representing the ratio of the 

heat energy required to generate the 

electricity consumed to the useful heat 

energy delivered at the appliance by the 

electricity, is applied to the auxiliary 

electrical consumption to reflect the 

true amount of energy used to run the 

blower or pump. The resulting formula 

is designated as equation (1) in 

Appendix B of American National 

Standards Institutel American SOCiety of 

Heating. Refrigerating, and AirConditioning Engineers Standard 103-

1988 which DOE considers the 

appropriate term to describe the Annual 

Efficiency of the appliance when both 

fossil fuel and auxiliary electrical 

energy consumption are considered 

together. 

Therefore, DOE proposes to adopt 

equation (1) in Appendix B of American 

National Standards mstitutel American 

Society of Heating. Refrigerating, and 

Air-Conditioning Engineers Standard 

103-1988 and the accompanying 

procedure in Appendix C of American 

National Standards Institutel American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 as the basis of a new rating 

term called Annual Efficiency for 

vented home heating equipment. The 

Department's proposal includes some 

modifications to the calculation 

procedure contained in Appendix B and 

Appendix C of American National 

Standards Institute/American Society of 

Heating. Refrigerating. and AirConditioning Engineers Standard 103-

1988. The DOE test procedure for 

vented home heating equipment does 

not require the recording of the blower 

on-time and off-time; therefore, the 
EE-RM-93-501 COMMENT 00

FedeT81 Resister I Vol. 58. No. 161 I Monday, August 23. 1993 I Proposed Rules 44547 

. operating time of the blower and the 

burner are assumed to be the same as 

the burner. This results in a simpler 

procedure than the one developed for 

the furnace test procedure discussed 

previously. The complete calculation 

procedure for the Annual Efficiency of 

vented home beating equipment is 

included in this document and may be 

found i.n appendix 0 to subpart B of 

part "30. . 2. Pilot Light Energy Consumption 

On September 21, 1990. Appalachian 

Stove and Fabricators. Inc. 

(Appalachian) and Valor Incorporated 

(V alar) each filed a "Petition for 

Waiver" requesting that DOE grant a 

waiver from the I)()E vanted home 

heating equipment test procedure 

regarding (a) pilot light energy 

consumption and (b) average weighted 

steady-state efficiency for their 

manually controlled vented home 

heaters. 

With regard to the pilot light energy 

consumption. the current DOE test 

prooedure requi.re8 the measurement of 

energy input to the pilot light (Qp) and 

the use of this data in the calculation of 

Annual Fuel Utilization Efficiency for 

the energy consumed by the pilot light 

when the heater UJ not in operation. 

Each petition cites a vented heater 

(Appalachian's AGS-44 model and 

Valor's model VN-32, respectively) 

fitted with a pieza ignitm'which fires a 

transient pilot for smooth and safe 

ignition of the main buroar. The user 

manually operata. the pilot light. the 

igniter, and the main burner. The pilot 

light. which remains on during the 

operation of the heater at all (three) 

settings of operation. is automatically 

turned off when the heater'. control 

knob is set to the "OFF" position. 

Operation of these units. eo:ording to 

the manufacturers' instructions. results 

in lower energy consumption and 

higher Annual Fuel ,Utilization 

Efficiency than calculated by the current 

DOE test procedure. Since the current 

DOE test procedure does not address 

this issue. the manufacturers each 

requested that the tel"II! involving the 

pilot energy consumption (Qpl be 

deleted in the calculation of Annual 

Fuel Utilization Efficiency. resulting in 

an Annual Fuel Utilization Efficiency 

which is equal to the heating seasonal 

efficiency of the heater. 

DOE granted the petitions. excluding 

the pilot light energy input term in the 

calculation of Annual Fuel Utilization 

Efficiency. subject to the heater having 

an easy-ta-read label near the control 

knob instructing the user to tum the 

valve to the OFF position when the 

heater is not in use.1I 

Having made the above 

determination. OOEtoday is pro~ 

to amend the test procedure accordingly 

for vented home heating equipment. See 

appendix 0 to subpart B 01 part 430. 

section 3.5. 

3. Weighted Average Steady-State 

Efficiency 

Appalachian and Valor also requested 

waivers from the current DOE test 

procedure for manually controlled 

vented heaters with various input rates 

where the weighted average steedy-state 

efficiency is detennined at 50 percent 

±5 percent of the maximum fuel input 

rate. 10 The manufacturers each stated 

that the manual controls on their 

respective heaters give three fix8d gas 

rates with the minimum rata at 65.3 

percent of the maximum rate. This 

precluded testing units at the 50 percent 

is percent rate as specified in the OOE 

test procedure. The manufactW'8J1l each 

requested approval for an alternate test 

procedure to determine the ateady-stata 

efficiency based on a weighted 8vwage 

of efficiencies obtained at the three 

fixed input settings. 

The Department denied use of an 

alternate test procedure based on a 

weighted average of three differant 

firing rates.t1 Instead, DOE required that 

the steady-state efficiency of the heaters 

be measured at their minimum fuel 

input rate of 65.3 percent of thsir 

maximum input rate. Thia minimum 

fuel input rate is closest to the 50 

percent is percent at which other 

manually controlled WIlted beaten are being rated. DOE believed that any other 

method would result in an unjustified 

higher Annual Fuel UtilUation 

Efficiency that would be unfair to other 

manufacturen of similar heaters 

because relatively higher firing rates 

would generally result in higher burner 

efficiencies. 

Accordingly. DOE is proeosing today 

that calculation of the weighted average 

steady-state efficioocy for manually 

controlled vented heaters use a 

minimum fuel input rste no higher than 

two-thirds of the maximum fuel input 

rate of the heater. See appendix 0 to 

subpart B of part 430. section 4.2.4. 

C. Unifonn Test Method for Measuring 

the Energy Consumption of Pool Heaters 

The Department published the pool 

heater tast procedure on February 7. 

1989.54 FR 6076. referencing American 

056 FR 51711 and 56 FR 51714. October 15. 11191. 

10 Appendix 0 to .ubpart B of part 430. 

It 511 FR 51711 and 511 FR 51114. October 15. 

1991. 

National Standards Institute Standard 

Z21.56-1986 for gas-fired pool heaters. 

DOE today proposee to am8ncl the pool 

hester test procedure to Include an 

annual efficiency descriptor which 

accounts for the auxiliary electrical 

energy OODsumed by the fan or pump in 

addition to ·lte fossil fuel consumed and 

to refenmoe the latest wrsioo of 

American National Standanllnatitute 

Standard, Z21.56-1990, remg,dzh18 that 

the 88Ctions referenced by the DOH pool 

heater test procedure have DOl chaft8ed. 

1. Annual Efficiency Dascriptor 

DOH detenntned that an additional 

new energy descriptor I. needed to 

adequately eddress the energy uaed by 

some of the design options oomddered 

fur standard level .waluation because 

the currenteDergy descriptor thennal 

efficiency does not include pilot Ught 

usage or electrical consumption. For 

example. to consider electronic Ignition. 

the sevings In pilot light pa 

consumption would have to be 

accounted for in the descriptor. 

Furthermore. design options. such as 

fan assisted combustion, Improve 

thermal efficiency but. at the same time. 

add electrical usage which. unless 

accounted for in the energy descriptor. 

could lead to higher thermal efficiency 

with little or no net energy savings. 

Therefure. the Department is proposing 

a new energy descriptor, Annual 

Efficiency. See appendix P to subpart B 

of part 430. section 4.1. 

The cummt test procedure for pool 

heaters prescribes a oaIculation of the 

thermal efficiency which Is based on the 

energy consumption of fossil fuel only. 

Since auxiliary electrical energy is 

consumed by the heaters for the 

operation of the fan or pump, OOE 

believes a more appropriate term for 

evaluating the efficiency of the heaters 

would be one which includes both the 

fossil fuel and the auxiUary electrical 

energy consumption of the heaters. 

Specifically. this Annual Efficiency is 

defined as the ratio of the annual output 

of energy delivered to the heated pool 

water by fossil fuel to the total annual 

energy input to the heater Including 

auxiliary electrical energy. 

The annual output of energy deUvered 

to the pool water would be the thermal 

efficiency of the heater multipHed by 

the average annual fossil fuel energy 

used by the pool heater minus the 

energy used by the continuous pilot 

light (if used) during the average nonpool season hours. The total annual 

energy input to the heater. including 

auxiliary electrical energy, would be the 

average annual fossil fuel energy to the 

pool heater plus the average annual 
EE-RM-93-501 COMMENT 00

44548 Federal Register I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 

auxiliary electrical energy consumption 

for the pool heater. 

The latter term (auxiliary electrical 

energy) is multiplied by a factor F 

which represents the ratio of the heat 

energy required to generate the 

electricity consumed to the useful heat 

energy delivered at the pool heater by 

the electricity to reflect the true amount 

of energy used to run the auxiliary 

electrical equipment. The average 

season of use of the pool in hours per 

year and the average burner op~rating 

hours during the pool season wIll be 

obtained from survey data on the 

Nation's use of heated pools. At the 

present time, season of use is assumed 

to be 4,464 hours per year, and the 

burner on-time per. year is assumed to 

be 104 hours. These values are based on 

limited survey data available as of 

February 15, 1991.12 DOE, today, 

proposes to adopt this annual efficiency 

descriptor using the F=3.37, the survey 

data on pool season, and burner 

operating hours. 

m. Environmental Review 

Pursuant to section 7(c)(2) of the 

Federal Energy Administration Act of 

1974 (Public Law 93-275), a copy of this 

document has been submitted to the 

Administrator of the Environmental 

Protection Agency for his comments 

concerning the impact of this proposal 

on the quality of the environment. 

Since test procedures are used to 

standardiza the measurement of energy 

usage and will not affect the quality or 

distribution of energy usage, prescribing 

test procedures will not result in any 

environmental impacts. DOE, therefore, 

has determined that prescribing test 

procedures under the Program is not a 

major Federal action significantly 

affecting the-quality of the human 

environment within the meaning of the 

National Environmental Policy Act of 

1969. This Rulemaking, which amends 

existing pltrt 430 of title 10, will not 

change the environ~ntal eff~ ~f such 

regulation, and is an Item which IS 

"categorically excluded" (A5) by the 

Department of Energy regul~tions on 

National Environmental Pohcy Act 

Implementing Procedures (10 CFR part 

1021) (57 FR 15122. 15152. April 24. 

1992) (Appendix A to subpart D of part 

1021, Categorical Exclusion ~5.). 

Consequently. neither an Envlfonmental 

Impact Statement nor an Environmental 

Assessment is required for the proposed 

rule. 

12 Berkeley Solar Group and Xenergy: 1~90. OP. 

Cit. P 8-9 and California Energy Commission. 

Electricity Report 18. California Energy 

Commission. Forecastins Division. Sacramento. 

California. as cited in the BGS/Xenel"8Y Report. 

IV. Regulatory Revie~ 

Pursuant to the January 22. 1993, 

memorandum on the subject of 

regulatory review from the Director of 

the Office of Management and Budget 

(58 FR 6074, January 25. 1993), ~E 

submitted this document to the Duector 

for appropriate review. The Director has 

completed his review. Separately, DOE 

has determined that there is no need for 

a regulatory impact analysis because the 

rule is not a major rule as that term is 

defined in section 1(b) of Executive 

Order 12291. 

V. Regulatory Flexibility Act 

The Regulatory Flexibility Act (public 

Law 96-345) (5 U.S.C. 601-612) 

requires that an agency prepare an 

initial regulatory flexibility analysis and 

that it be published at the time the 

proposed rule is published. ~is 

requirement (WhIch appears In 5 U.S.C. 

603) does not apply if the agency 

"certifies that the rule will not, if 

promulgated, have a significan~ 

economic impact on a substantial 

number of small entities." The proposed 

rule affects manufacturers of fumacas 

andlboilers. vented home heating 

equipment. and pool heaters. As 

previously discussed. the test 

procedures would not have significant 

economic impact, but rather. would 

provide common testing methods. 

Therefore, DOE certifies that the 

proposed rule, if promulgated. ~~uld 

not have a "significant economIC Impact 

on a substantial number of small 

entities." 

VI. Federalism Review 

Executive Order 12612 (52 FR 41685. 

October 30.1987) requires that 

regulations or rules be reviewed for any 

substantial direct effects on States. on 

the relationship between the Federal 

Government and the States. or on the 

distribution of power and 

responsibilities among various levels of 

Government. If there are sufficient . substantial direct effects. then Executive 

Order 12612 requires preparation .of a 

federalism assessment to be used In all 

decisions involved in promulgating and 

implementing a regulation or a rule. 

DOE has identified a substantial 

direct effect that today's proposed rule 

would have on State governments. It 

would initially preempt inconsistent 

State regulations. However. DOE has 

concluded that such effect is not 

sufficient to warrant preparation of a. 

federalism assessment for the followmg 

reason: the Act provided for subsequent 

State petitions for exemption. Thus. a 

determination as to whether a State law 

prevails must be made on a case-by-case 

basis using criteria set forth in the Act. 

When DOE receives such a petition, it 

will then be appropriate to consider 

preparing a f~eralis~ as~sment 

consistent WIth the cntena In the Act. 

VB. Review Under Section 32 of the 

Federal Energy Administration 

Authorization Act 

The test procedures proposed today 

incorporate the commercial standards to 

measure the efficiency and capacity of 

furnaces andlboilers. vented home 

heating equipment, and pool heaters: 

The commercial standards are Amencan 

National Standards Institutel American 

Society of Heating. Refrigerating. and 

Air-Conditioning Engineers Standard 

103-1988 and American National 

Standards Institute Standard Z21.56-

1990. 

Pursuant to section 301 of the 

Department of Energy Organization Act 

(Public Law 95-91). DOE is required to 

comply with section 32 of the Federal 

Energy Authorization Act, as amended 

by section 9 of the Federal Energy 

Administration Authorization Act of 

1977 (Public Law 95-70). 

The findings required of DOE by 

section 32 of the Act serve to alert the 

public and DOE regarding the use and 

background of commercial standards in 

a proposal and through the rulemaking 

process. They allow interested persons 

to make known their views regarding 

the appropriateness of the use of any 

particular commercial standard in a 

proposed rulemaking. 

DOE has evaluated American National 

Standards Institutel American Society of 

Heating. Refrigerating, and AirConditioning Engineers Standard 103-

1988 and American National Standards 

Institute Standard Z21.56-1990 with 

regard to compliance with section 32{b) 

of the Act. The Department is unable to 

conclude whether these standards fully 

complied with the requirements of 

section 32(b) of the Act. i.e., that they 

are developed in a manner which fully 

provided for public participation, 

comment, and review. 

As required by section 32(c) of the 

Act. DOE will consult with the Attorney 

General and the Chairman of the Federal. 

Trade Commission concerning the 

impact of these .standards o~ .. competition. pnor to prescnbmg final 

test procedures. 

vm. Public Comment 

A. Written Comment Procedures 

Interested persons are invited to 

participate in the rulemaking by 

submitting data. comments, or 

information with respect to the 

proposed test procedures sel forth in 
EE-RM-93-501 COMMENT 00

Federal ~r I Vol. 58, No. 161 I Monday. August 23, 1993 I Proposed Rules 

this document to the address indicated 

at the beginning of tbe documenL 

Comments should be identified both 

on the envelope and on the documents 

as "Furnaces, Vented Home Heating 

Equipment and Pool Heaters Test 

Procedures," (Docket No. EE-RM-93-

501). Ten (1~) copies are Nqussted to be 

submitted. Additiooally, the 

Department would appreciate an 

electronic copy of the COlIlIMJlts to the 

extent possible. The Department is 

currently using WordPedect'Dof 5.1. All 

submittala received by the date 

specified at the beginning of this 

document will be considered by OOE 

before final action is taken on the 

proposed amendments. 

Pursuant to the provisions of 10 CFR 

1004.11. any person submitting 

information which be or she believes to 

be confidential and exempt by law from 

public d.i3closure should submit one 

romplet8 copy of the document and 

eight copies. if possible. from which the 

infonnation believed to be confidential 

has been deleted. DOE will make its 

own determination with ragard to the 

confidential status of the information 

and treat it according to its 

determination. 

Factors of interest to DOE when 

evaluating NqUests to treat as 

confidential information that has been 

submitted include: (1) A description of 

the items; (2) an indication as to 

whether and why such items are 

customarily treated as confidential 

within the industry; (3) whether the 

information is generally known by. 01' 

available from, other sources; (4) 

whether the information has pl'8viously 

boon made available to others without 

obligation concerning its 

confidentiality; (5) en explanation of the 

competitive injury to the submitting 

person which would result from public 

disclosure; (6) an indication as to when 

such information Dlfxbt lose its 

confidential charscter due to the 

passage of time; and (1) why disclosure 

of the information would be contrary to 

the public interest. 

B. Public Hearing 

1. Procedures for Submitting Requasts to 

Speak 

The time and place of the public 

hearing are indicated at the beginning of 

this docwnenL DOE invites any person 

who has an interest in today's proposed 

rule. or who is a repl'8Sentative of a 

group or class of persons that has an 

interest in the proposed test procedures. 

to make a request for an opportunity to 

make an oral presentation. Such 

requests should be directed to the 

address indicated at the beginning of 

this dOCUID~t. Requests may be hand 

deliV8l'8d to such address between the 

hours of 8 a.m. and 4 p.m., Mond.y 

through Friday. except Federal holidays. 

Requests should be labeled "Furnaces. 

Vented Home Hea~uipment. and 

Pool Heaters Test urea,» (Docket 

No. EE-RM-93-501), both on the 

document and on the enyelope. 

The person making the request should 

briefly describe the interest coooerned 

end state why he or she. either 

individually or as 8 repl'8iS8Dt8tiYe of 

group or class of persons that have such an interest, is an appropriate 

spokesperson, and giYe a telephone 

number where he or she may be 

contacted. 

Each person selected to be heard is 

requested to submit an advance copy of 

the statement prior to the hearing as 

indicated at the beginning of this 

document. In the event any person 

wishing to testify cannot meet this 

requirement, that peniOIl may Dlake 

alternative arrangements with the Clftkle 

of Hearings and Dock8ls in adv.ance by 

50 indicating in the letter NqU8Sting to 

mab an oral presentation. 

2. Conduct of Hearing 

DOE reserves the right to select the 

persons to be heard at the hearing, to 

schedule the respective presentations. 

and to establish the procedures 

governing the conduct of the hearing. 

The length of each presentation is 

limited'to 20 minutes. 

A DOE official will be designated to 

preside at the hearing. The bearing will 

not be • ju(ijcial 01" an evidentiary-type 

hearing but will be conducted in 

accordance with 5 U.s.c. 533 and 

!J8dioo 336 of the Act. At the 

conclusion of all initial oral statmneo.ts 

at each day of the hearing, each penson 

who has made an oral statement will be 

given the opportunity to mab • I'8buttal 

statement, subject to time limitations. 

The rebuttal statement will be given in 

the order in which the initial statements 

were made. The official conducting the 

hearing will accept additional 

comments or questions from those 

attending. as time permits. Any 

interested person may submit. to the 

presiding official. written questions to 

be asked of any person making a 

statement at the hearing. The pl'8Siding 

official will determine whether the 

question is relevant and whether time 

limitations permit it to be presented for 

answer. 

Further questioning of speakers will 

be permitted by DOE. The presiding 

official will afford any interested person 

an opportunity to question, with respect 

to disputed issues of material fact. other 

interested persons who made oral 

presaatations. as well .. amployaea of 

the U.S. Governnumt who haw IDIlde 

written or oral preI8IltatioDa, ~ to 

the proposed.rule.. This opportunity will 

be afforded after any l'8buttal statement 

to the extent that the predding official 

determinaa that such ~ is 

likely to result in a lOON timely .... effective resolution oJ disputed i __ of 

material fact. If the time provided is 

insufficient or inconvenient, DOE will 

consider affording an additic:mal 

opportunity for questioning at a 

mutually convenient time. Persons 

interested in making use of this 

opportunity must submit their Nq08Sl 

to the pI'8Iiding official no later than 

shortly after the completion of any 

rebuttal statements and be pl'8pamd 10 

state specific jUBtificatioA iDcluding 

why the issue is one of disputed fact 

and how the proposed qilestions would 

expedite their t'8501ution. 

Any furthw procedural ftlles 

regarding proper conduct of the hearing 

will be announced by the presiding 

official. 

A transcript of the J.rius will be 

made. and the entire record of this 

rulemaking, including the transcript. 

will be retained by DOE and made 

available for inspection at theDOE 

Freedom of Information Reading Room as provided at the beginning of this 

document. Any person may pwdlase 8 

copy of the tnmscript from the 

transcribing reporter. 

G.Issues for Public Comment 

DOE is interested in receiving 

commenta and data CXIDCB:'IliJI8 the 

acaarac:y and workability ofu-test 

procedures. /Uao, J)()E ....-:om.-

discussion 110 improY8 ..... or 

alternatiYeS to these approacbea. In 

particular. ])()E Is in-.ted in 

gathering COIl1IJleDU on the foJ.lowio8.: • The appropriatBDess of a new efficiency desaiptOl'-8IlDual efficiency 

descriptor-for vented home heetins 

equipment that includes both the fossilfuel and auxiliary electrical energy 

consumption; 

• The appropriateneas of a new 

effiCiency descriptol'-8l1Jlual efficiency 

deScriptor-for pool heaters that 

includes burner and pilot light usage 

fossil fuel and auxiliary electrical 

energy consumption; 

• 1be appropriatenese of a now efficiency descriptCJI'--eDnual efficiency 

descriptor-for furnaces that includes 

both fossil fuel and auxiliary electrical 

energy for indoor installations; • The appropriateness of a modified 

efficiency descriptor--eDergy factOl'-fcr 

isolated combustion installations; and 

• The appropriate1l88S of a test 

procedure for furnaces and boilers basad 
EE-RM-93-501 COMMENT 00

44550 Federal Register I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 

on an inpuVoutput method as opposed 

to the current and proposed method 

which measures losses only. 

List of Subjects in 10 CFR. Part 430 

Administrative practice and 

procedure, Energy conservation, 

Household appliances. 

Issued in Washington, DC. July 23. 1993. 

Robert L San Martin, 

Acting Assistant Secrettuy. Energy Efficiency 

and Renewable Energy. 

For the reasons set forth in the 

preamble, part 430 of chapter n of title 

10, of the Code of Federal Regulations 

is proposed to be amended as set forth 

below: 

PART 430-ENERGY CONSERVATION 

PROGRAM FOR CONSUMER 

PRODUCTS 

1. The authority citation for part 430 

continues to read as follows: 

Authority: 42 U.S.c. 6291~309. 

2. Section 430.2 is amended by 

adding definitions for terms "Annual 

Efficiency" and "Mobile Home 

Furnace" in alphabetical order. to read 

as follows: 

1430.2 DefInitions. 

'" '" '" '" 

Annual Efficiency means the 

efficiency descriptor for fossil-fueled 

beating appliences that takes into 

account the energy consumed and the 

useful heat produced by the appliances 

from both the fossil fuel and the 

auxiliary electrical energy to the 

appliences, including a multiplication 

factor which represents the ratio of the 

energy consumed at the source of 

electricity generation (power plant) to 

the electrical energy delivered at the 

appliances (site), and that is celculated 

based on indoor installation for nonweatherized units and outdoor 

installation for weatherized units. 

'" '" * * '" 

Mobile Home Furnace a direct vent 

furnace that is installed indoors and 

designed for use only in mobile homes. 

* * * * * 

3. Section 430.22 is amended as 

follows: 

A. In § 430.22 (n)(l)(i), revise the 

words "Section 4.8 or 4.10" to read 

"Section 10.19.2 or 10.20.4" and in 

430.22{n)(1)(ii). revise the words 

"Section 4.9" to read "Section 10.19.3" 

and revise the words "Section 4" to read 

"Section 10". 

S. In § 430.22 (n)(2). revise the words 

"Section 4.6" to read "Sections 10.12.2. 

10.13.6. and 10.14.2" and revise the 

words "Section 4.1 of Appendix N of 

this subpart" to read "Section 11.1 of 

ANSIIASHRAE Standard 103-1988". 

C. In § 430.22 (n)(3)(i). revise the 

words "Section 4.11 or 4.13" to read 

"Section 10.22.2 or 10.22.4" and in 

430.22(n)(3)(ii), revise the words 

"Section 4.12" to read "Section 

10.19.6.3". 

D. In § 430.22 (n)(4). revise the words 

"Section 4.14" to read "Section 10.19". 

E. In § 430.22, add paragraph (n)(6), 

revise paragraphs (0)(2), (0)(3), and 

(p)(l) and add paragraph (p)(3) to read 

as follows: 

1430.22 Test procedures for II'I88OUI'M of 

energy COMumption. 

'" * * * .. 

(n) Furnaces 

'" * '" .. (6) The annual efficiency for furnaces. 

expressed in percent. is the ratio of the 

sum of the annual fossil fuel output of 

useful energy plus the auxiliary 

electrical energy recovered as useful 

heat. to the sum of the annual energy 

input to the furnace (fossil fuel) plus the 

energy required to generate the auxiliary 

electrical energy delivered at the 

furnace, determined according to 

section 10.23 and 10.25 of appendix N 

. of this subpart. 

(0) Vented Home Heating Equipment 

.. * * * 

(2) The estimated annual operating 

cost for vented home heating equipment 

is the sum of: 

(i) The product of the average· annual 

fuel energy consumption, in Btu's per 

year for natural gas. propane, or oil 

fueled vented home heating equipment, 

determined according to section 4.6.2 of 

appendix 0 of this subpart, and the 

representative average unit cost in 

dollars per Btu for natural gas, propane, 

or oil, as appropriate, as provided 

pursuant to section 323(b)(2) of the Act; 

plus 

(ii) The product of the average annual 

auxiliary electric energy consumption in 

kilowatt-hours per year determined 

according to section 4.6.4 of Appendix 

o of this subpart, and the representative 

average unit cost in dollars per kilowatthours as provided pursuant to section 

323(b){2) of the Act, the resulting sum 

then being rounded off to the nearest 

dollar per year. 

(3) The annual efficiency for vented 

home heating equipment, expressed in 

percent. is the ratio of the sum of the 

annual fossil fuel output of useful 

energy plus the auxiliary electrical 

energy recovered as useful heat to the 

sum of the annual energy input to the 

vented home heater (fossil fuel) plus the 

energy required to generate the auxiliary 

electrical energy delivered at the vented 

home heater determined according to 

section 4.6 of Appendix 0 of this 

subpart. 

* * * * * 

(p) Pool Heaters 

(1) The estimated annual operating 

cost for pool heaters Is the sum of: 

(i) The product of the average annual 

fuel energy consumption, in Btu's per 

year of gas, or oil fueled pool heaters. 

determined according to section 4.2 of 

Appendix P of this subpart, and the 

representative average unit cost in 

dollars per Btu for gas or oil, as 

appropriate, as provided pursuant to 

section 323(b){2) of the Act. plus 

(ii) The product of ~e average annual 

auxiliary electric energy consumption in 

kilowatt-hours per year determined 

according to section 4.3 of Appendix P 

of this subpart, and the representative 

average unit cost in dollars per kilowatthours as provided pursuant to section 

323(b){2) of the Act, the resulting sum 

then being rounded off to the nearest 

dollar per year. 

* * * * * 

(3) The annual efficiency for pool 

heaters, expressed in percent. is the 

ratio of the annual fossil fuel output of 

useful energy, to the sum of the annual 

energy input to the pool heater (fossil 

fuel) plus the energy required to 

generate the auxiliary electrical energy 

delivered at the pool heater. determined 

according to section 4.1 of appendix P 

of this subpart. 

* * * * * 

4. Appendix N to subpart B of part 

430 is revised to read as follows: 

Appendix N to Subpart B of Part 430-

Uniform T .. Method for Measuring the 

Energy Consumption of rum aces and 

Boilers 

1. Scope. The scope of this appendix shall 

be as specified in section 2.0 of ANSU 

ASHRAE Standard 103-1988. 

2. Definitions. Definitions shall include the 

definitions specified in section 3.0 of ANSU 

ASHRAE Standard 103-1988 and the 

following additional definitions: 

2.1 Annual efficiency means the ratio of 

annual output energy to annual input energy 

whicb includes botb fossil fuel and auxiliary 

electrical energy. Tbe annual output energy 

includes the auxiliary electrical energy 

recovered as useful beat. Tbe annual input 

energy includes any non-beating season pilot 

input loss and a multiplication factor to the 

auxiliary electrical energy input at the 

appliances wbich represents the ratio of the 

energy consumed at the source of electricity 

generation to the electrical energy delivered 

at tbe appliancas. 

2.2 ANSIIASHRAE Standard 103-1988 means the test standard publisbed in 1988 by 

ASHRAE. approved by ANSI on August 28, 
EE-RM-93-501 COMMENT 00

Federal Register / Vol. 58, No. 161 / Monday, August 23, 1993 / Proposed Rules 44551 

1988. and entitled "Methods of Testing for 

AFUE of Residential Central Furnaces and 

Boilers." 

2.3 ASHRAE means the American Society 

of Heating. Refrigerating. and AirConditioning Engineers. 

2.4 Inlet damper means a type of electromechanical damper upstream of the burner 

combustion air inlet that isan integral part 

of the burner and which Is designed to 

automatically open the air flow passage to 

the burner box combustion air inlet when the 

burner is on and to automatically close off 

the air passage and rastrict the air flow 

through the heat exchanger when the burner 

is off. 

2.5 Post purge means the design that 

permits the continued operation of the 

combustion blower in a power vented unit. 

power burner unit. or forced draft unit for a 

period of time after the main burner is shut 

off for the purpose of venting of residue flue 

gases in the heat exchanger and the venting 

system. 

2.6 Thermal stack damper means a type 

of stack damPer which is dependent for 

operation exclusively upon the direct 

conversion of thermal energy of the stack 

gases to open the damper. 

3.0 ClaSSifications. The classifications 

shall be as specified in section 4.0 of ANSI/ 

ASHRAE Standard 103-1988. Substitute 

sections 3.1.3.1.1.3.1.2.3.1.3 and 3.1.4 of 

this appendix for sections 4.8. 4.8.1. and 

4.8.2. of ANSIfASHRAE Standard 103-1988. 

3.1 Off-Cycle Devices. 

3.1.1 Stack damper. 

3.1.2 Electro-mechanical inlet damper. 

3.1.3 Electro-mechanical flue damper. 

3.1.4 None. 

4. Requirements. Requirements shall be as 

specified in section 5.0 of ANSI/ ASHRAE 

Standard 103-1988. 

5. Instruments. Instruments shall be as 

specified in section 6.0 of ANSI! ASHRAE 

Standard 103-1988. 

6. Apparatus. The apparatus used in 

conjunction with the furnace or boiler during 

the testing shall be as specified in section 7.0 

of ANSIIASHRAE Standard 103-1988. 

Substitute sections 6.1. 6.2. 6.3, 6.5. 6.6 and 

6.7 of this appendiX. respectively. for figure 

1 of sections 7.2.1.1. 7.2.2.1. 7.2.2.2. 7.2.3.1. 

7.3.2.1.7.3.2.2.7.3.3.1 and 7.3.1. and figure 

6 is substituted with-figure 1 of this 

appendix. supplement sections 7.2.2.3 and 

7.3.2.3 with additional specifications as 

described in section 6.8 of this appendix. and 

section 6.4 of this appendix which 

supplements the apparatus section of ANSII 

ASHRAE Standard 103-1988: . 

6.1 Gravity central furnaces. Note 2 in 

figure 1 of section 7.2.1.1 of ANSI/ASHRAE 

Standard 103-1988 is replaced with the 

following: Note # 2. 2" insulation (optional) 

with K=0.27 Btuein.l(hr-ft 2.o

F). 

6.2 The following paragraphs supplement 

the requirements specified in sections 7.2.2.1 

and 7.3.2.1 of ANSI/ASHRAE Standard 103-

1988: 

For units equipped with integral draft 

diverters which are mounted in an exposed 

position (not inside the overall unit cabinet). 

cover the diverter boxes (excluding any 

openings through which draft relief air flows) 

before the beginning of any test (including 

jacket loss test) with insulation having Rvalue of not less than 7 hreft 2.oFlBtu and an 

outer layer of aluminum foil. For units 

equipped with integral draft diverters which 

are enclosed within the overall unit cabinet, 

insulate the draft diverter box with insulation 

described above before the cool-down and 

the heat-up tests described in sections 9.5 

and 9.6 of ANSIIASHRAE Standard 103-

1988. respectively. Do not apply the 

insulation for the jacket loss test (if 

conducted) described in section 8.6 vf ANSI/ 

ASHRAE Standard 103-1988 and the steadystate test described in section 9.1 of ANSII 

ASHRAE Standard 103-1988. 

For furnaces equipped with draft hood and an electro-mechanical burner box inlet 

damper or an electro-mechanical flue 

damper. cover the 5-ft tes! stack with 

insulation having R-value of not less than 7 

and an outer layer of aluminum foil before 

conducting the tracer gas measurement' for 

the determination of the off-cycle loss factor 

KL described in section 8.9 of this appendix. 

6.3 The following paregraph supplements 

the requirements specified in sections 7.2.2.2 

and 7.3.2.2 of ANSI/ASHRAE Standard 103-

1988: 

For units with power burners. cover the 

flue collection box with insulation having Rvalue of not less than 7 and an outer layer 

of aluminum foil before the cool-down and 

heat-up tests described in sections 9.5 and 

9.6 of ANSIIASHRAE Standard 103-1988. 

respectively. However. do not apply the 

insulation for the jacket loss test (if 

conducted) described in section 7.3 of ANSI! 

ASHRAE Standard 103-1988 and the steadystate test described in section 9.1 of ANSlf 

ASHRAE Standard 103-1988. For power 

vented units. insulate the shroud 

surrounding the blower impeller with 

insulation haVing an R-value of not less than 

7 hreft 2. 0F/Btu and an outer layer of 

aluminum foil before the cool-down and the 

heat-up tests. Do not apply the insulation for 

the jacket loss test (if conducted) and the 

steady-state test. Do not insulate the blower 

motor or block the air flow openings whose 

purpose is for cooling of the combustion 

blower motor or bearings. 

6.4 Down flow furnaces. Install the 

internal section of vent pipe the same size as 

the flue collar for connecting the flue collar 

to the top of the unit if not supplied by the 

manufacturer. Do not insulate the internal 

vent pipe during the jacket loss test (if 

conducted) described in section 8.6 of ANSI/ 

ASHRAE Standard 103-1988 and the steadystate test described in section 9.1 of ANSlf 

ASHRAE Standard 103-1988. Insulate the 

internal vent pipe before the cool-down and 

heat-up tests described in sections 9.5 and 

9.6. respectively. of ANSI/ASHRAE Standard 

103-1988 with insulation having R-value of 

not less than 7 hreft2.oF/Btu and an outer 

layer of aluminum foil. If the vent pipe is 

surrounded by a metal jacket. insulate the 

metal jacket with insulation as described for 

the vent pipe above. Install a 5-ft test stack 

of tbe same cross sectional area or perimeter 

as the vent pipe above the top of the furnace. 

Tape or seal around the junction connecting 

tbe vent pipe and the 5-ft test stack. Insulate 

the 5-ft test stack with not less than R-7 

insulation and an outer layer of aluminum 

foil. See figure 2 of this appendix. 

6.5 The following paragraphs supplement 

the requirements specified in section 7.2.3.1 

of ANSI/ASHRAE Standard 103-1988: 

For units with an integral draft diverter. cover the five feet of stack with insulation 

having R-value of not less than 7 hr-ftz.oFI 

Btu and an outer layer of aluminum foil. For 

units with draft hoods. insulate the flue pipe 

between the outlet of the furnace and the 

draft hood with insulation having R-value of 

not less than 7 hr-ft 2e°F/Btu and an outer 

layer of aluminum foil. , 

For units with integral draft diverters 

which are mounted in an exposed position 

(not inside the overall unit cabinet), cover the 

diverter boxes (excluding any openings 

through which draft relief air flows) before 

the beginning of any test (including jacket 

loss test) with insulation having R-value of 

not less than 7 hreft z.oF/Btu and an outer 

layer of aluminum foil. For units equipped 

with integral draft diverters which are 

enclosed within the overall unit cabinet. 

insulate the draft diverter box with insulation 

described above before the cool-down and 

the heat-up tests described in sections 9.5 

and 9.6 of ANSIIASHRAE Standard 103-

1988. respectively. Do not apply the 

insulation for the jacket loss test (if 

conducted) described in section 8.6 of 

ASHRAE Stand6I'd 103-1988 and the steadystate test described in section 9.1 of ANSI! 

ASHRAE Standard 103-1988. 

6.6 The following paragraph supplements 

the requirements specified in section 7.3.3.1 

of ANSlfASHRAE Standard 103-1988: 

For units with an integral draft diverter. 

cover the five feet of stack with insulation 

having R-value of not less than 7 hr-ftz.oFI 

Btu and an outer layer of aluminum foil. For 

units with draft hoods. insulate tbe flue pipe 

between the outlet of the furnace and the 

draft hood with insulation baving R-value of 

not less than 7 breft2eOf/Btu and an outer 

layer of aluminum foil. 

For units with integral draft diverters 

which are mounted in an exposed position 

(not inside the overall unit cabinet). cover the 

diverter boxes (excluding any openings 

through which draft relief air flows) before 

the beginning of any test (including jacket 

loss test) with insulation having R-value of 

not less than 7 breft 2e°F/Btu and an outer 

layer of aluminum foil. For units equipped 

with integral draft diverters which are 

enclosed within the overall unit cabinet. 

insulate the draft diverter box with insulation 

described above before the cool-down and 

the heat-up tests described in sections 9.5 

and 9.6 of ANSIIASHRAE Standard 103-

1988. respectively. Do not apply the 

insulation for the jacket loss test (if 

conducted) described in section 8.6 of ANSII 

ASHRAE Standard 103-1988 and the steadystate test described in section 9.1 of ANSlf 

ASHRAE Standard 103-1988. 

6.7 Piping. Substitute the following 

paragraph for section 7.3.1 of ANSIfASHRAE 

Standard 103-1988: 

See figure 1 of this appendix and figures 

7,8. and 9 of ANSIIASHRAE Standard 103-

1988 for typical piping arrangements for hot 

water and steam boilers including electric 

boilers. 

6.8 Oil-fueled or power gas forced air 

central furnaces or oil-fueled or power gas 
EE-RM-93-501 COMMENT 00

44552 Federal Register I Vol. 58, No. 161 I Monday. August 23. 1993 I Proposed Rules 

1_ pressure and hot water boilen. The 

following paragrapb supplements the 

requirelll8l:lts specified in sections 7.2.2.3 

and 7.3.2.3 of ANSlI ASHIlAE Standard 103-

1988: 

Adju.tmeDt of draft is to be done only on 

urHts with barometric draft control. 

7. Testing conditions. The testing 

conditions sball be lIS specified in ll8ction 8.0 

of ANSlJASHRAE Standard 103-1988 with 

the exception of sections 8.2.1.5.2. 8.6.1.1. 

Table 6. and sections 8 .•. 2.1. 8.8.2.2. a~8.3 

and 8.8.4.1 wbich are nnriAd lIS described in 

sections 7.1. 7.2.. 7.3, 7.4..1. 7.4.2. 7.4.3 and 

7.6 of this appendix. respecti¥ely.1l1Jd the 

inclusiOD 01. additional test COIlditions as desai.bed In section 7.5 of this appendix. 

7.1 The fullowing JlU88I1lph supplements 

the requir8meJJt specified in Menon 8.2.1.5.2 

of ANSIJA.SHRAE Sbmdard 103-1988: 

For UIlits wbich employ a draft hood and 

equipped wilD aD electm-mecbanical burner 

inlet damper (.: an electro-mechan.ical flue 

damper upstream of the Graft hood. inMallan 

additional thennocoupht grid in a bomonlal 

plane in the 5-ft test stack described in 

section 7.2.2.1 of ANSIIASHRAE Standard. 

103-1988 and in section 6.2 of this appendix. 

located one fuot from the a.t stack inlet (use 

fIgures 3A ud 38 of ANSI! ASHRAE 

Standard 103-1988 for refereBce in the 

installation of the thermocouple grid in the 

test stack). 

7.2 The fullowing paragraphs supplement 

the requi_ts .pecified in section 8.6.1.1 

of ANSIIASHRAE Standanll03-1988: 

For fumed llirc:entnU fumacee'. the 

circulating air blower compartment is 

considered as part of the duct system and no 

surface t~ ~ment of the 

blower COI1Ip8l1ment needs to be recorded for 

the p~ of this test. 

For uaH. with veJltiJatioD air openings on 

the top. frnDt. or side. of the unit. those . 

openings from which the -ulation air exits 

from the abiaat shall be taped ow sealed with 

aluminum tape durins this teSt. A lIlllOke test 

daring allteady-state test may be used to 

determine the openinglI where the ventilation 

air exits from the cabinet. 00 the taped 

openinga. subdivide the aree into the normal 

36 sq. in. grids as in section 8.6.1.1 of ANSI! 

ASHRAE Standard 103-1983 and measure 

the surface UmJper8tures ill ~ grid with a 

surface thermocouple. Install the 

thel1llOCOUp1e OYer the aluminum tape if 

1l8C8SfIIIIy. 

For down flow furnacea. measure all 

cabiaet surface temperatures of the heat 

exchanger and combustion section. including 

the bottom around the outlet duct and the 

burner door. using the 36 sq. in. 

thermocouple grid delCribed in section 

6.6.1.1 of ANSIJASHRAB Standard 103-

1983. If the bum ... door is lOuvered to allow 

for combustion air to ent .... measure 

temperatures ffil the metal strips between the 

louY9l'S using the nor:mal3ti SCI- in. grid. The 

cabinet surface temperatures around the 

blower sactiou do not need to be measured 

(see figure 2). and the taping of the 

ventilation air openiIlss shall be as described 

above. 

7.3 System Numbers. Substitute tabla 1 of 

tl: is appendix for Table 6 of ANSIJ ASH RAE 

Standard 103-1983. 

7.4 Optional tracer gas method fO& 

determining draft factors [)Po IlF. and Os for 

systems equipped with power burDen ow direct vent. 

7.4.1 The following paragraph 

supplements the requirements specified in 

section 8.8.2.1 of ANSI/ASHIlAE Standard 

103-1988: 

For units with step modulating controls. 

the optional tracer gas procedure sball be 

conducted during the cool-down test 

deacribed in section 9.7 of ANSIJASHRAE 

Standanl103-1938 at the reduced input rate 

only. For UDits with two stage modulatiDg 

controls. if the optional tracer gas procedure 

is amducted during the cool-down test 

described in section 9.7 of ANSIIASHRAE 

Standard 100-1988 at the reduced input rate, 

it shall also be conducted at the maximum 

input rate. and vice ~ 

7.4..2 Substitute the W01'ds "OIl system. 

for whrch the stack damper is to be cu-i 

during the cool-down test ..• " for the first 

S8Bhmce of section 8.1.2.2 of ANSU ASHRAE 

8mndard 103-1988 and remove the words 

"fll:le or" in the fint tine of section 8.8.2.2 

of ANSI/ASHRAE Standard 103-1988. 

7.4.3 The value 0.00001 at the end of 

sectiO!! 8.8.3 of ANSIJ ASHRAE Standard 

103-1988 is substituted with the value 0.05. 

7.5 Method fur det9rminill8 off.qcle loss 

factor KL fur atmospheric systems with an 

integral draft diverter or draft hood and 

equipped with either an electro-mechanical 

inlet damper or with an electro-mechanical 

flue damper upstream of the draft diVMtel' or 

draft hood that restricts the flow through the 

heat exchanger in the off-cycle. The 

following paragraph is an additional 

subsection under section 8.8 of ANSI! 

ASHRAE Standard 103-1988. The method 

shall apply only if the electro-mechanical 

damper (inlet damper or flue damper} closes 

completely within 10 seconds after the 

burner shuts off. Determine Kt.. (the ratio of 

off-cycle sensible heat loiS tested with the 

electro-mechanical damper (inlet damper or 

flue damper) closed during the off-cycle to 

the off-cycle sensible heat loss tested with 

the electro-mechanicaI damper held open 

during the off-cycleJ during two additional 

lo-minute duration cool-down tests. Conduct 

these two additional cool-down tests after the 

cool-down and heat-up tests described in 

sections 9.5 and 9.6 of ANSI! ASHRAE 

Standard 103-1988 are completed. During a 

short burner off period before the two 

additional cool-down tests but after the 

completion of the heat-up test. cover the 5· 

ft tes.t stack with insulation on units 

equipped with draft hood as described in 

section 6.2 of this appendix, and. on units 

equipped with integral draft divarter. remove 

the blocking over the draft relief opening and 

the restriction over the test stack outlet but 

keep the insulation over the rest of the draft 

divarter surface on (see section 9.1.4 of 

ANSIIASHRAE Standard 103-1988}. 

Conduct the first additional cool-down test 

by fIrst running the unit until steady-state 

conditions are reached (see section 9.1.2.1 of 

ANSIIASHRAE Standard 103-1988} and then 

shutting the unit off with the electromechanical damper adjusted or bypassed so 

that the damper is held open during the 

resulting cool-down period. After the cooldown period. conduct the secOD<! additional 

coo '-down test by again running the unit 

until steady-state conditions are reached and 

then shutting the unit off but with the 

electro-mechanical damper operating as designed during the resulting cool-down 

period. Measure the stack gas mass flow rata 

(Ms,OFFJ and the stack. gas temperature during 

the two additional cool-down period. 

described above at between 5 and 6 minutes 

into the cool-down period using tracer gas as 

described in section 8.9 of this appendix and 

compute the olf-cycle sensible heat losses 

over this ORe minute interval and the loss 

factor Ki.. with the calculation procedures as 

descn1Jed in section 10.16 of this appendix. 

7.6 The following paragraph supplements 

the requirements as specified in section 

8.8.4.1 of ANSI! ASHRAE Standard 103-

1988: 

Note that the area As is the cross sectional 

area of the ftue pipe. not the area inside any 

ring that is attached to the inside of the flue 

pipe. Measure the anI8 of any holes or cut 

outs in the stack damper b~~!; Ao,D. and 

either measure or obtain the 

manufacturer of the stack damper leakage 

area. AOJ-. at the damper shaft and around 

the damper edge wmm the damper is at the 

closed position. Both areas shan be measured 

at the plamr of the damper. 

8.0 Test procedure. Testing and 

measnremeftts shall be as specified in section 

9.0 of ANSI/ASHRAE Standard 103-1988 

with tbe exception of sections 9.5.1.1 and 

9.5.1.2.1 which are substituted by sec:tiom 

8.2 and 8.4 of this appendix. respectively. 

and sections 9.1.2 .• 9.1.2.2.1. 9.1.2.2.2. 

9.1.2.3.1.9.5.1.2,9.5.1.2.1.9.5.1.2.2.9.5.2.1, 

9.5.2.3.9.6.1.9.7 and 9.10 are replaced by 

sections 8.1. 8.3. 8.5. 8.6. 8.7 and 8.8 of this 

appendix. respectively, and the inclusion of 

the additional procedures in sections 8.9. 

8.9.1 to 8.9.7 and 8.11 ofthis appendix. as follows: 

8.1 Steady-State Condition and 

Requirements. 

8.1.1 In~9.1.2.2.1and9.1.2.2.2of 

ANSlIASHRAIi Standard 103-1988. in the 

sentence ". . . measure the steady-state 

electric power to the power bumef' on units 

so equipped.. ... substitute the word bumtJr for 

the phrase powet' burner. Also in sections 

9.1.2.2.1 and 9.1.2.2.2 of ANSlI ASHRAE 

Standard 103-1983, substitute the following 

for the last sentence "For bot water boilers. 

use a steady-state water pump power of 0.13 

kW.": 

"For hot water boUers. measure the steedy· 

state electrical power to the water pump the 

same way as for the air blowets for furnaces. 

See section :'.7, Fig. 11 of ANSIIASHRAE 

Standard 103-1988." 

8.1.2 The fuUowing paragraph 

supplements the requirement specified in 

sections 9.1.2.2.1 and 9.1.2.2.2 of ANSlI 

ASHRAE Standard 103-1983: 

For bumers equipped with an intermittent 

or interrupted ignition device (electric spark 

ignition. glow coil, or bot surface. etc.) also 

measure the total electric power to the bumer 

when the device is on. PET. Measure and 

record too length of the time intet'Val when 

the interrupted ignition device is on, 4<-.. with 

a stop watch. 

8.1.3 The following paragraph 

supplements the requirement specifIed in 
EE-RM-93-501 COMMENT 00

Federal Register I Vol. 58, No. 161 I Monday, August 23, 1993 J Proposed Rules 44

section 9.1.2.3.1 of ANSUASHRAE Standard 

103-1988: 

On units employing draft hood. secure a 

sample of the stack gases at either a 

horizontal plane in the stack 12 in. 

downstream of the draft hood or in a 

horizontal plane 6 in. from the top of the test 

stack. Make sure that there are no holes or 

air leaks in the section of the stack from the 

draft hood up to the location where the stack 

gas is sampled. Determine the concentration 

by volume of carbon dioxide (CG.z.s) present 

in dry stack gas. Use figures 3A and 3B (test 

stack for units with draft diverter) as , 

reference for the location of CO:z 

measurement. 

8.2 Gas- and oil-fueled gravity and forced 

air central furnaces without stack damperscool-down test. The following paragraphs are 

in place of the requirements spacified in 

section 9.5.1.1 of ANSUASHRAE Standard 

103-1988: 

Turn off the main burner after steady-state 

testing is completed and measure the flue gas 

temperature by means of the thermocouple 

grid described in section 7.6 of ANSII 

ASHRAE Standard 103-1988 at 1.5 

(TF.QFF(t))) and 9 minutes (TF.QFF(4» after 

burner shuts off. An integral draft diverter 

shall remain blocked. insulated. and the 

stack restriction shall remain in place. On 

atmospheric systems with an integral draft 

diverter or draft hood and equipped with 

either an electro-mechanical inlet damper or 

an electro-mecbaniclal flue damper which 

closes within 10 seconds after the burner 

shuts off to restrict the flow through the heat 

exchanger in the off-cycle. bypass or adjust 

the control for the electro-mechanical 

damper so that the damper remains open 

during the cool-down test. 

For furnaces that employ post pwge, 

measure the length of the post purge period 

with a stopwatch. The time from burner off 

to combustion blower off (electrically deenergized) shall be recorded as tp. Measure 

the flue gas temperature by means of the 

thermocouple grid described in section 7.6 of 

ANSI/ASHRAE Standard 103-1988 at the 

end of post purge period tp (TF.QFF(tP» and at 

the time (1.5+tp) minutes (TF.OI'F(t))) and 

(9.o+tp) minutes (TF.0FPt4» after the main 

burner shuts off. For the cases where the 

measured tp is lesa-Jban or equal to 5 

seconds, it shall be tested as if there was no 

post purge. 

8.3 In section 9.5.1.2 of ANSI/ASHRAE 

Standard 103-1988. substitute the following 

sentence for the sentence "For oil-fueled or 

power gas burner furnaces. maintain the draft 

in the flue pipe within to.ot in. of water gage 

of the average steady-state draft. ": 

"For oil-fueled or power gas burner 

furnaces employing barometric dampers for 

draft control. maintain the draft in the flue 

pipe within to.Ol in. of water gage of the 

average steady-state draft." 

8.4 Gas- and oil-fueled gravity and forced 

air central furnaces without stack damperscool-down test. The following paragraph is in 

place of the requirements specified in 

sections 9.5.1.2.1 and 9.5.1.2.2 of ANSI! 

ASHRAE Standard 103-1988: 

For a furnace with adjustable fen control. 

this time delay will be 1.5-minute for 

condensing furnaces. For non-condensing 

furnaces with adjustable fan control. this 

delay shall be 3.O-minute or until the supply 

air temperature drops to a value of 40°F 

above the inlet air temperature whichever 

results in the longest fen on-time. 

For a furnace without adjustable fen 

control or with the type of adjustable fan 

control whose range of adjustment does not 

allow for the delay times specified in the 

above paragraph. the control shall be 

bypassed and the fan manually controlled to 

give the delay times spacified in the above 

paragraph. 

For a furnace which employs a single 

motor to drive the power burner and the 

indoor air circulating blower. the power 

burner and indoor air circulating blower 

shall be stopped together. 

For a power burner employing post purge 

where the post purge period is controlled by 

the fan control during the cool-down period. 

the fen control shall be adjusted to give a 

time as spacified above and the combustion 

blower and the fan shall be stopped together . 

as designed. 

8.5 Gas- and oil-fueled boilers without 

stack dampen. The following paragraph 

Suppleml!nts the requirements spacified in 

section·9.5.2.1 of ANSUASHRAE Standard 

103-1988: 

For boilers that employ post purge. 

measure the length of the post purge period 

with a stopwatch. The time from burner off 

to combustion blower off (electrically deenergized) shall be recorded as tp. Measure 

the flue gas temperature by means of the 

thermocouple grid described in section 7.6 of 

ANSIIASHRAE Standard 103-1988 at the 

end of post purge period tp (T F.oMtp) and at 

the time (3.75 + tp) minutes (TF.oMt3)) and 

(22.5 + tp) minutes (TF.QFF(4)) after the main 

burner shuts off. For the cases where the 

measured tp is less than or equal to 5 

seconds. it shall be tested as if there was no 

post purge. 

8.6 In section 9.5.2.3 of ANSUASHRAE 

Standard 103-1988. substitute the following 

for the sentence "For oil-fueled or power gas 

burner units not equipped with stack 

dampers. maintain the draft in the flue 

within the same ranges spacified in section 

9.5.1.2.": . 

"For oil-fueled or power gas burner units 

employing barometric dampers for draft 

control and not equipped with stack 

dampers. maintain the draft in the flue 

within the same ranges spacified in section 

9.5.1.2." 

8.7 The following paragraph supplements 

the requirements spacified in section 9.6.1 of 

ANSI/ASHRAE Standard 103-1988: 

For a unit designed to operate with an 

unvarying time delay (case 3 described in 

section 9.6.1 of ANSII ASHRAE Standard 

103-1988). the unit shall operate as designed 

except that the time delay shall be not less 

than 20-second. If the delay is less than 20 

seconds. the blower control shall be bypassed 

and the blower started manually 20 seconds 

after the burner starts up. If the time delay 

is adjustable by dip switch or jumper 

terminals. select the time delay closest to the 

1.5-minute specified except when the 

maximum time delay that can be selected is 

less than 20 seconds in which case the 

blower control shall be bypassed and the 

blower started manually 20 seconds afte

burner starts up. 

8.8 Optional tracer gas test procedure

determining draft factors for I)p, DF. and 

for systems equipped with power burner

direct vent and not equipped with stack 

dampers. The following are deletions an

additions to sections 9.7 and 9.7.3 of AN

ASHRAB Standard 103-1988: 

8.6.1 In section 9.7.3 of ANSUASHRA

Standard 103-1988. the sentence "At the 

same time. if draft is not maintained duri

the cool-down. measure the flue gas 

temperature. TF.oA'. using the thermocou

grid described in section 7.6." is replaced 

with: At the same time. measure the flue 

temperature. T F.oFF. using the thermocou

grid descriQ6d in 7.6. 

8.8.2 The following paragraph 

supplements the requirements specified i

section 9.7.3 of ANSUASHRAB Standard 

103-1988: 

For systems employing post purge with 

post purge time period tp (see sections 8.2 

and 8.5 of this appendix). measure the 

percent volumetric concentration of the 

tracer gas present in the diluted flue gas 

sample. Or, at between (5+tp) and (6+tp) 

minutes after the burner shuts off. During 

same time period. measure the flue gas 

temperature. TF.oFF, using the thermocoup

grid described in section 7.6 of ANSU 

ASHRAE Standard 103-1988. 

8.8.3 Substitute the value 0.05 for the 

value 0.00001 at the end of the paragraph 

section 9.7.4 of ANSI/ASHRAB Standard 

103-1988. 

8.8.4 For units with two stage modula

controls the optional tracer gas test shall b

conducted at both the maximum and the 

reduced inputs. For units with step 

modulating controls, the optional tracer g

test shall be conducted at the reduced inp

only. 

8.9 Tracer gas test procedures for 

determining off-cycle loss factor Kt. for 

atmospheric systems with integral draft 

diverter or draft hood and equipped with 

either an electro-mechanical inlet damper 

an electro-mechanical flue damper that 

restricts the flow through the heat exchan

in the off-cycle. . 

8.9.1 The tracer gas chosen for this tas

should have a density which is less than o

approximately equal to the density of air. 

a gas that is of a different chemical spacie

or different concentration from the flue ga

to be measured and unreactive with the 

environment to be encountered. Obtain th

concentration of tracer gas present In the f

gas sample (Or) using an analyzer or 

instrument with accuracy of ±2 percent in 

measured value. Determine the temperatu

of the tracer gas entering the flow meter (T 

and the barometric pressure (PB). 

8.9.2 After the completion of the heat-

test in section 9.6 of ANSI! ASHRAE 

Standard 103-1988, tum the burner off. O

units equipped with an integral draft 

diverter. remove the blocking over the dra

diverter and the restriction In the test stac

that are installed during the steady-state t

(in preparation for the cool-down test) in 

section 9.1.4 of ANSU ASHRAB Standard 

103-1988. Do not remove the insulation 

covering the draft diverter surfaces. On un
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equipped with draft hood. C091Il" the s-ft test 

stack with insulation material with R-value 

of IlO len tI!an 7 ~"F'1Btu and !til outer 

layer of alumiDtHD foil .. deIaibed in 

sedWn 6.2 olum appendix. In the mea 

time. ~e and feed the ambient air to the 

tracer 8U analyaer and MCOld the 

background roIK:8Iltration Crs oftha tnK:er 

gas to be used for thtt test (0Il9 data point is 

usually IRlfficient). 

8.9.3 T'Um the bl1l'Dflr on until steadystaIB CODditiODS imt 8IJ&in achieved .. 

specified in section 9.1.2.1 of AHSII A5HRAE 

Standard 103-1988. Tum tIte burner off for 

a lo-mill'Utl&cool-down period. Adjustor 

bypess th& electlo-mecbanical dllll'JfMlr (inlet 

damper or flue damper) 80 that it remains 

open during this cool-doWl!l period. Within 

one minute after the unit is shut off to start 

this cool-down test. begin filediDg a trace!' sas 

with a known, C8ltified ooucentratiOD Grm at a constant flow rate VT into the lower part 

of the test stad just aboY& the test pJaae 

where tbe lItack tllemIocouph grid ill Ioca8l!ld 

(see section 8.2.1.S.1 of AHSIlASHRAB 

Standard 

the value 

103-1988). 

of V

Periodically ~ 

T withe iIlstaa4lmeou.sIy 

reading flow met. J:rrrias III acauacy of ±3 

pen:eot of the q_tity measured and 

maintain that value of tracer 8M flow rat6 at 

leR than ODe pen:ent of the air flow rate 

through the test stack. 

8.9.4 Within ODe minute after the tracer 

gas flow is started. conuect: the tracer gae 

sampling line to the sampling probe located 

at a pI_ iMide and 6 in. below the top e?rit 

of the test stack. Measure the transport delay 

time which is equal to the time between tbe 

connecti1l8 of the sampq line and the 

initial resptH!l!I& of the tracer gee analyzer. 

Add to this transport time the time reqni!ed 

fur the anal)'38\" to I88Cb 90 pemmt of it» 

steady-state .. rue ae specified in the 

analyzer's operation manual. The sum of 

these two 'ftlue8 is the tracer (pili sample 

delay time It89ded to match the 

conceDtratioa meaeurement to the 

tempentnre~ iD the off-period 

lOIS calculatioa. Meke sure fltat a well mixed 

sample is collected by ums a multi-hol& 

sampling probe as recommeII.ded in 

Appendix D. section B of ANSIIASHRAE 

Standard 103-1968. Return the sample gas 

(after exiting the gas amUyzeot) let the top of 

the test stack downstream of tire phme of 

collection. 

8.9.5 At 5 mimmll after the unit is shut off 

to start the cool-down test. mtI8SUl'9 ItDd 

record the percent volumetric concentratioll 

of tracer gtIS present in the stack gas sample. 

Cr. at the klcatioD specified in section 8.9.4 

of this appendix. At the same time. me&SttI"e 

the stack gas femperatuJ'e. Ts.Of'F. using the 

th8l"ll1OCOUple srid in the test plane (see 

section 8.2.1.5.1 or ANSUASHRAB Standard 

103-1988). The data Illt!MU1'II'fJlnt and 

recording should be dODe at a time interval. ~t. of 5 second. for the next 2 to 3 minutes. 

Tne exact length of time required fix the 

tracer gas data measurement is equal to the 

tracer gas sample delay time (see section 

8.9.4 of this appendix) plus 1 minute. (Even 

though only oue minute of tracer gas data are 

required for the computation of the off-cycle 

loss. the longer time is needed to take into 

account the time delay between the 

concet!ltration data and the t~ det"" 

Slop the tracer gas injection aDd sampling 

after tbe required data are _!IUJ'9d 8Bd 

recorded. DisconBect the tracer su lIIIIBpling 

line from the sample probe and sample the 

ambient air to £leer the line. 

8.9.6 At the eud of tM lo-mimlte cooIdOWft period. tum OIl the burner until steedystate conditions are again achieYed aw 

specified in section 9.1.2.1 of ANSI! ASHRAE 

Standard 103-1988. Tum the burner off for 

another 1o-minute cooI-down period. Let the 

electro-mechanical damper (inlet damper or 

flue damper] close the way it is designed to. 

Repeat the test steps of sections 8.9.3 through 

8.9.5 or tbilil appendix except that the electromechanical damper is to ramain closed. Note 

that the tracer gas feeding rate. VT, may have 

to be adjusted to a lower rate to keep the 

sample concelltlation within the range of the 

gas analyzer used. 

8.9.7 The rate of the stack gas flow through. 

the stack. the off-cycle S8JlSibIe loss rate. and 

the loss factor ~ are calculated by the 

equations in sact.i0ll 10.1i of iliis appendix. 

8.10 Substitute the value O.OS for the value 

0.00001 in the first sentence of section 9.10 

of ANSiiASHRAE Standard 103-1988. 

8.11. Direct measurement of off-cycle 

losses testiDg method. 

9. /V{)mesu;/ature. Nomenclature shall 

include the nomenclabtr& specified in 

section 10.0 of ANSIIASHRAE Standard 103-

1988 with the exatptioD of the variables 

Me.PH eel Qc which are !&Vised in this 

appendix and the following additional 

variables: 

A.&=Annnal Efficieacy. percent 

Ao=minimum opeDing area (mduding 

leakage) of liltack Qamper wli&en closed. i~ 

=Ao.noosO+Ao.L A~ _ (holas aDd cut-outs) in sack 

damper plate. in2 

Ao.L~ area arowtd ltac:lr.: damptil' shaft 

md dmaper .ts-. iul 

Cnt=concatratioD by YOlume 01 the tracer 

gas in the badgrocmd. peJalOt 

Drn=infiltraOoa COmtctiOl1 factor for stack 

damper effecti_ 

Kt.=off-cycle loss factor for atmospheric 

burner with burner ialet damper or with 

flue damperupltre&IB oftha integral 

draft diverter or dra.t\ hood 

Me=mass of condensate. Ib 

PE=electrical power to burner under steadystate operation. kW 

PEr=total e1edricaI power to burner when 

the electrical intermittent or interrup(ed 

ignition devk:e if employed is on. kW 

PEIO=PEr-PE. el«:trU:al power to the 

electrical intermittent or interrupted 

i8nition de\Jice. kW 

Qc=fuel 8Il6F8Y input durin8 entire (3 or 6 

test cycles) cyclic condensate collection 

test. Btu 

CJs.QFF"'Off-cycle sensible loss rate. Btu/min. 

Qs.OFf""l minute sum of the measured 

qs.~t. where At is defined below. Btu 

tVELA y=delay time. sum of tracer gas analyzer 

response time to reach 90 percent of the 

steady state value and the gas transport 

time delay. minutes 

tlG=electrl:cal intermittent or interrupted 

ignition device on-time. minutes 

tp:::power homer post Purse time parrod. 

minutes 

T F.()F!'(tp)=ofH:ycle flue pi temperatuJe at 

the end of power burner post pul!8 

period. "F 

YIG=ratio of elec:trical iDtermittent or 

iloltBmlpted i8nftioa *rice on-time to 

average bumer oa-time 

yp::ratio of power tNmur combustion blower 

on-time to IMmI88 burner on-timf!l 

At=time interval between each ID88lUnl1Deut 

oftemparaftlr8 fJF tracer sas 

concemratioo. INICOftds 

10. Cillculation of derived results from test 

measurements. Calculations shall be as specified in section 1 LO of ANSf/ASHRAE 

Standard 103-1988 with the exception or sections 11.2.4. Table 7 (of section 11.2.6). 

11.2.9.4,11.2.9.6. 11.2.9.9.11.2.9.14. 

11.2.9.16.11.2.9.19,11.2..9.20.11..2.10.8. 

11.2.10.8.11.2.11.11.2.12.11.3.12. 

11.4.B.1..2. 11.4.8.5. 11.4.S.8.. 11.4.8_10, 

11.4.12.11.5.12. 11.1U.lt.7.1.11.7.%. 

11.2.9.18. 11.4. 11.5 and Appendix E wbich 

are substituted. and the inclusion of 

additional caICtllations in sections 10.16, 

10.17.10.18, 10.19 and 10.21 of'this 

appendix. as ronows: 

10.1 Remmre the words "oil or power"" in 

the first sentem:e of tile second pmagraph of 

section 11.2".4 of ANSflASHRAE Standard 

103-1983 and the beginning oft~e $ent.nee 

is substituted by "Por gas furnaces and 

boilers requiring draft relief:". The first 

sentence in the fmuth p~ of section 

11.2.4 (lofth line from the beginning of the 

section) of ANSl/ASHRAB Standard 103-

1988 is substituted by "For oil Or gas JIO'WtIf 

furnaces and boilers tested with barometric 

dampers but not marketed Itnd sold with 

attached barometric dampers. SIF shltll be 

1.4". Tbe sentence in the third pan!8I'&pb of 

section 11.2.4 of ANSI/ASHRAE Smulud 

103-1988. ""For gas fumaalS and boilen Dot 

raquiriDg draft relief: SlP=l" is JUbstitumJ 

by "'For dinJd exlMmst 8l1li 8Zld oil fu.macas 

and boilen: SlF=l". 

10.2 Tobie 'l. A risbt dosilag bracelet is 

added at the end of the equation delinill! 

L..ss in Table 7 of sec:tioIlU.U 01 ANSJI 

ASHRAESbmdani 103-1988. 

10.3 On-t:yde time constant. The 

followiag calculations procedures 

supplem8lllt the procedures specified in 

section 11.2.9.4 of ANSJI ASHRAE StaDdard 

103-1988: 

If T F.ON(h~T F.sS. use T F.QN{tt)=T F.8S - 0.2 

IfTF.ONtf2}~TF.8s. use TF.ONttz)=TF.ss-O.l 

IfTF.ONttl~TF.oNftz). use 

T F.ONttl)=T F,()N{l7}- 0.1 

11M Off-cycJe time constant. The 

following calculation piucedures supplement 

the procedures specified in section 11.2.9.6 

of ANSIIASHRAE Standard 103-1988: 

IfTF.CJR'C4)~F.OFFCts). use 

T F.<lf'Flt..}=T F.<JFFl:tsl+O.l 

lfTF.<JFFl:t3)$TF.~tS), use TF.OFFft3}=TF.omt,}-+O.2 

If T F.<lf'Fltl)$T F.~4). WI8 

TF.~h)=TF.<JFFl:41+o'l 

For furnaces or boilers employing post 

purge with post purge period tv (see secoons 

8.2 and 3.S oftbis appendix}. the time t). 4-

and t5 are defined as: 

For furnaces; 
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Federal Register I Vol. 58, No. 161 I Monday. August 23, 1993 I Proposed Rules 4455l 

13=(tp+1.5) minutes 

t.=(1r+9.0) minutes 

15=infinity. 

For boilers: 

13=(1,.+3.75) minutes 

t ... =(tp+22.5) minutes 

t~=45 minutes 

wbere: 

t,=ls as defiDed in 8.2 (furnaces) and 8.5 

(boilers) of this appendix 

10.5 Substitute the following for the 

definitions ofOt- in section 11 2.9.9 of ANSI! 

ASHRAE Standard 103-1988: 

[)p=off-qcle flue 888 draft factor equal to: 

=1.0 for Wlits with atmospheric burners. 

systems 1. 5. 9 (except direct vent and 

atmospheric burners with either electromechanical inlet dampers or t1 ..Ie 

dampers). 

=0.4 or l)p for units with power bumers. 

systems 2. 3. 4. 6. 8. 10. 

=1.0 or Dp for direct vent units with 

atmospheric burners. system 9 (direct 

vent only). 

=1.0 or Dp for atmospberic burners with 

either electro-mechanical inlet dampers 

or flue dampen. system 1. aud system 9 

with units employing isolated 

combustion. 

=0.05 for units complying with section 

7.4.3 of this appendix. 

In the same aectioD (11.2.9.9). the 

definiti()fll for Os<> for systems 4 aDd -8 is 

revised to read 88: 

Ds<>=0.85 or /(0.79+Op)/1.41 for syst"ms 4 and 

8. 

10.6.1 The definitions for 'I'F.o.x and 

9l'.o.x in section 11.2.9.14 of ANSIIASHRAE 

Standard 103-1988 are revised to read as: 

IjIF.O.x=as defined in section 11.2.9.7 of ANSI! 

ASHRAE Standard 103-1988 

9l-.o.x=as defined in section 11.2.9.5 of ANSI! 

ASHRAE Standard 103-1988 

10.6.2 The phrase "9--12" in the eighth 

line of section 11.2.9.16 of ANStlASHRAE 

Standard 103-1988 is deleted and the 

Infiltration correction factor for slack. calculate the infiltration correction factor 

damper effectiveness. For systems f..~. or 8. Do.. defined as: 

where: 

hj=dimensionless time increment given by 

hJ=l/n. 

n=l00. number of segments betwPfln tl 

toA=O to tltmr=1.0 

IjIS."'=ljIs.OO,x as defined in section 11.2.9.9 

of ANSIIASHRAE Standard 10.1-1988 

Gl =1jI-s.oee"p( - tltof·'F)='I'S.oeexp! (to~'F1 

tOf-r)(tltOFf )) 

G2=(Gl+28)U)~1 (Gl+630)i19 

G3=Gl+100 

G4=(Gl+128)O~ I (Gl+630)119 

IjIS.o=8S defined in section 11.2.9.17 of 

ANSI/ASHRAE Standard 103-1Q88 

1jI •. ooJ=(Or)(IjIF.OO) I ((S/F)(DsJ)(Dsn)l for (S/F) 

(DsJ)(Dso) >Or 

=If/F.OO for (S!F)(Ds'J}(Ds") SDF 

1I'F.-=as defined in section 11.2.9.16 of 

ANSIIASHRAE Standard 103-1986 

GIJ=ljIs.oJeaxp{ - (toFF/toFF}(tltoA)) 

G2j=(Gll+28)O·~ I (Glj+630)'·9 

G3,=Gl j+l00 G4,=(Glj+128)O~ I (Glj + 630)119 

1fI~.OJ=(Ot-)(.F.o) I ((SIF}(OsJ)(Dso)j for (SI 

F)(DsJI(Ds"1 >Or 

b<Jginnlng of the sentence is revised to read 

"For systems numbered 9--10:". 

10.7 DeWmine tbtt off-cycltJsfIJcJc [lOS 

draft fod«. Ds. The followiD8 caJculatiou 

procecIun'IIl are in place of section t 1.2.9.18 

of ANSI! ASHRAE Staadard 103-1988: 

Detennine the off-qcle stack 8u.draft 

factor. Os. defined as: 

Ds=t.O forsyslems 1 and 2. 

=0.4 or Op for direct exhaust system with 

power burners. system 3. 

=0.85 or ((t).7t+Op)/1.4J for system 4. 

=00 for systems 5 and 6. 

=0.8500 or ({O.79+1)p)/1.4JDo for system 8. 

where: 

l)p=as defined in sectioD 11.2.9.9 of ANSII 

ASHRAE Stand8l'd 103-1988. 

Do=stack damper effectiveness factor 

defined as follows: 

Stack damper effectiveness factor. For 

systems 5. 6, or 8. calculate the stack damper 

effectiveness factor. Do. defiIled lIS: 

='I'F.o for (S/F)(DsJ)CDso) so., 

If/F.o=as defined In section 11.2.9.15 of 

ANSIIASHRAE Standard 103-1988 

Values of Ds,r during the summation: 

DsJ=1.0 when O:S t < t, 

OsJ=Ds' when t, :S t < t., 

DSJ=DE when t., :S t S!oFF 

where: 

t=jhJto~r 

and 
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• 

44556 Federal Register I Vol. 58, No. 161 I Monday, August 23. 1993 I Proposed Rules 

where: 

t=(t - t,)/(f., - t.) when 0 S; i S; 1 

t.=time when damper start to close 

f.,=time when damper finishing closing. 

or=t.+t.J, when t.J=the duration of closing. 

DE=(AoI As).[5I[5(AoI Asj2+2.6(1 - Aof 

As)t.5sJ}lh 

where: 

As=cross-sectional area of the stack, in 2. 

(see section 8.8.4 of ANSI/ASHRAE 

Standard 103-1988) 

Ao=net area of the damper plate. in 2. (see 

section 8.8.4 of ANSI/ASHRAE Standard 

103-1988) 

Ao=minimum opening (including leakage) 

area of the damper when closed. 

=Ao,oCQSO+Ao,L, in 2 

Ao.o=holes and cut-outs in damper plate as defined in 7.6 of this appendix 

Ao.L=leakage area around damper shaft 

and edges as defined in 7.6 of this 

appendix 

O=the angle the damper makes when 

closed. with a plane perpendicular to the 

axis of the stack (see section 8.8.4 of 

ANSI/ASHRAE Standard 103-1988), 

radians 

10.8 Off-cycle heat loss integration 

factors. The following paragraphs are 

modifications to sections 11.2.9.19 and 

11.2.9.20 of ANSI!ASHRAE Standard 103-

1988: 

For systems numbered 5-8: 

For system number 3: 

where: 

Ts.ss=as defined in section 11.2.9.3 of 

ANSI/ASHRAE Standard 103-1988 

TF.ss=as defined in section 11.2.5 of ANSII 

ASHRAE Standard 103-1988 

530=as defined in section 11.2.10.3 of 

ANSII ASHRAE Standard 103-1988 

ToA=as defined in section 11.2.8.4 of 

ANSI/ASHRAE Standard 103-1988 

KI.ON=as defined in section 11.2.9.2 of 

ANSIIASHRAE Standard 103-1988 

Ds=as defined in section 10.7 of this 

appendix 

10.8.1 Off-cycle sensible heat loss 

integration factors. The following paragraphs 

supplement the calculation procedures 

specified in section 11.2.9.19 of ANSI! 

ASHRAE Standard 103-1988: 

For systems numbered 2. 3. and 4 which 

employ post purge after the burner is shut 

off. determine off-cycle sensible heat loss 

integration factors. F3 and F4. from Figures 

14 and 15 of ANSIIASHRAE Standard 103-

1988. respectively. using values of'l'F.o 

defined in 11.2.9.15 of ANSIIASHRAE 

Standard 103-1988. and a modified RoFF 

defined as: 

RoFF=(loFF - tp)/tOf-r 

where: 

loFF=as defined in section 11.2.9.12 of 

ANSIIASHRAE Standard (ANSII 

ASHRAE) 103-1988 

lp=as defined in section 8.2 (furnaces) or 

8.5 (boilers) of this appendix 

toFFas defined in section 11.2.9.6 of 

ANSIIASHRAE Standard 103-1988 

For system number 10 which employs post 

purge after the burner is shut off. determine 

off-cycle sensible heat loss integration 

factors. F5 and F6. from Figures 16 and 17 

of ANSI/ASHRAE Standard 103-1988. 

respectively. using values of'PF,o defined in 

section 11.2.9.15 of ANSII ASHRAE Standard 

103-1988. and the modified RoFF defined 

above. 

Do=as defined in section 10.7 of this 

appendix 

DOI=as defined in section 10.7 of this 

appendix 

70=as defined in section 11.2.10.1 of ANSII 

ASHRAE Standard 103.,.1988 

T RA=as defined in section 11.2.5 of ANSII 

ASHRAE Standard 103-1988 

For system numbers 9 and 10: 

KI.OIr=O 

10.10 Off-cycle sensible heat loss. The 

following are revision and additions to the 

calculation procedures specified in section 

10.8.2 Off-cycle infiltration heat Joss 

integration factors. The following paragraphs 

supplement the calculation procedures 

specified in section 11.2.9.20 of ANSI! 

ASHRAE Standard 103-1988: 

For system numbered 2 and 4 which 

employ post purge after the burner is shut 

off. determine off-cycle infiltration heat loss 

integration factors, F7 and F8, from figures 18 

and 19 of ANSIIASHRAE Standard 103-

1988, r6'spectively. using values of'l's.o 

defined in section 11.2.9.17 of ANSII 

ASHRAE Standard 103-1988, and a modified 

RoFF defined in section 10.8 of this appendix. 

For system number 3 which employs post 

purge after the burner is shut off, determine 

off-cycle infiltration heat loss integration 

factors. F7 and F8. from Figures 18 and 19 

of ANSIIASHRAE Standard 103-1988, 

respectively. using values of 'l'F,O defined in 

11.2.9.15 of ANSII ASHRAE Standard 103-

1988. and a modified RoFF defined in section 

10.8 of this appendix. 

10.9 Multiplication factor for infiltration 

loss during burner off-cycle. The following 

paragraphs are in place of the calculation 

procedure speCified in section 11.2.10.4 of 

ANSIIASHRAE Standard 103-1988: 

Calculate a multiplication factor for 

infiltration loss during burner off-cycle 

KIoOf-r. defined as: For systems numbered 1. 2 and 4: 

11.2.10.6 of ANSI/ASHRAE Standard 103-

1988: 

10.10.1 The definition for F6 in section 

11.2.10.6 of ANSI/ASHRAE Standard 103-

1988 is revised to read as "and F6=as defined 

in section 11. 2.9.19." 

10.10.2 The following paragraphs are 

additions to the calculation procedures as 

specified in section 11.2.10.6 of ANSI! 

ASHRAE Standard 103-1988: 

For furnaces or boilers employing post 

purge after the burner is shut off. calculate 
EE-RM-93-501 COMMENT 00

Federal Ilegister I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 44557 

the off-cycle sensible heat loss of the system. 

Ls.()FP, expressed in percent and defined aa: 

LS.OFFLs.OWI + Ls.OFP:I 

Where LS.Of'PI. the otf-q-cle sensible heat loss 

during the post purse period. is defined 

as: 

LS•

OFF1 = 100· Cp . MF•ON . tp . (TF•SS + 460) . [l/(toN . QIN .60)]. 

where: 

~.oA' b' systems aumbored 2, 3 and 

4 

=(Cs')(Cr,ow) for syltem number 10 

Cr.0Fr""8S defined I.n II8CtioD 11.2.9.14 of 

ANSIIA..SHKAB se.ndard 103-1988 

Cs'=as defined in J8dion 11.2.9.15 of 

ANSIIASHRAB Standard 103-1988 

and when ~.CA'2, the oft'<ycIe sensible heat 

10l1li after the post purse period. Is defined as: 

For systems numbered 2, 3 and 4: 

Ls,()PP2Z'(Ks.Of'P)t(ta>p - tp)/toNt-HF3) + 

("",..,.,)(F4" 

For syst.em number 10: 

Ls.OI'I'2=(Ks.Of'P)((tow- tp)/foNt-UPS) + 

r.F.oc)(F6») 

where: 

100=c0nversioa 6Ic:tor to express 8 decimal 

as8 percent 

CFaI defined I.n section 11.2.9.1 of ANSII 

ASH.IitAE Standard 103-1988 

MF.ON"'rate of flue gas mau flow during the 

on period. as defined in section 11.S.1 of 

ANSIIASHRAB Standard 103-1988 

and 

LI,() .... "2. the off-cycle infiltration lwat loss 

after the post purge period. is defined as: 

For system numbered 2 and 4: 

L •. OFP:F(K1.0A-)(70 - ToAlUtorF- tp)/ 

toN).[(F7)+(IjIs,oc )(F8)) 

For system number 3: 

L • .oA'l=O<:r.oFF ){70 - T o.J(loFF - 1,,)1 

toNJ.[(F7)+(ljIF."" )(F8)] 

where: 

lOO=conversion factor to express a dec.i.mal 

as a perrent 

G=as defined in section 11.2.9.1 of ANS!! 

ASHRAE Standard 103-1988 

M"ON=rate of flue gas mass flow during !hfl 

on period. as defined in section 11.6.1 of 

ANSI/ASHRAE Standard 103-1988 

tp=Iengtb of post purge time, as defined in 

sections 8.2 and 8.5 of this appendix 

TF,ss=as defined iD aection 11.2.5 of ANSII 

ASH.RAE Standard 103-1988 

<lsN=as defined in sectioD 11.2.8.1 of ANSII 

ASHRAE Standard 103-1988 

60=conversiOD factor, hour to minute 

46O=couvers1on factor •. oF to OR 

T RA=as defined in section 11.2.5 of ANSII 

ASHRAE Standard 103-1988 

TF.OFFl:tp)=otf-cycle flue 8U temperature at 

Ute end of power burner post purge 

period (see section 8.2 or 3.5 of this 

appendix), OF 

F3. F4, F5 and F6=as defined in section 

10.8.1 of this appendix for units with 

post purge. and in section 11.2.9.19 of 

ANSIIASHRAE Standard 103-1938 for 

units without post purge 

10.11 Off-cycle infiltrotion hoot Joss. The 

following paragraphs are revisions and 

additions to the calculation procedures 

specified in section 11.2.10.8 of ANSII 

ASHRAR Standard 103-1988: 

Ip::length of post purge time. as defined in 

8.2 and 8.5 of this appendix 

TF.SS=aS defined in section 11.2.5 of ANSII 

ASHRAE Standard 103-1988 

46O=conversion factor, OP to OR 

70=assumed average indoor air 

temJ1eratur6. as defined in section 

11.2.10.1 of ANSlfASHRAE Standard 

103-1988. Of 

ToA=national average outdoor air 

temperature, as defined In section 

11.2.8,4 of ANSIIASHRAE Standard 

103-1988, OF 

TkA=as defined in soction 11.2.5 of Al"lSII 

ASHRAE Standard 103-1988 

GrOF~-8S defined in section 11.2.9.14 of 

ANSIIASHRAE Standard 103-1988 

10.11.1 The equation defining K...ow and 

F7. F8 are revised to read as: 

K..Of'P'"as defined i.n section 10.9 of this 

appendix 

F7, F&=ae defined iB sectiOB 11.2.9.20 of 

ANSIIASHRAE Staadatd t03-1988 for 

units without post purge 

10.11.2 The foUowiD8 JlIIrII8I1IPbs 

supplement the calculation prooedUlel 

specified in MCt10n 11.2.t0.8 of ANSII 

ASHRAE Standard 103-1988: 

For furnaces or boile'l'll employing post 

purge after the burner i8 shut off. calculate 

the off-q-cle inflltration heat 10S11 of the 

system, LI,OFP, expressed in percent and 

defined as: 

L •• Of'P=Lt.OI'F1+LI.OFf'2 

Where L1,0A-,. the otf-q'cle infiltration heal 

loss during the post purge period. 11 

defined as. for IYstems uumbered 2. 3. 

aad4: 

TF,<WF{tpl=off-q-cie Oue 888 &empenrture at 

the end of power bumer post purge 

period (see section 8.2 or 8.5 of this 

appendix), OF 

F7 and F8=as defined in section 10.8.2 of 

this appelldix for power burners with 

post purge 

<lJN=as defined in section 11.2.8.1 of ANSlI 

ASHRAE Standard 103-1988 

6fr--eonversion factor, hour to minute 

For system number 10: 

4.oA'1=0 

LI.OFFl=O 

10.12 Heating seasonal efficJency and 

AWE. The following paragraph. supplement 

the calculation procedures as specified In 

sections 11.2.11 and 1 L2 12 of ANSU 

ASHRAE Standard 103-1988: 
EE-RM-93-501 COMMENT 00

44558 Federal Register / Vol. 58, No. 161 / Monday, August 23, 1993 / Proposed Rules 

10.12.1 Heating seasonal efficiency. 

10.12.1.1 For furnaces or boilers 

employing post purge after the burner is shut 

off. the definitions for LS.OFF and LI.OFF are replaced with the following in section 

11.2.11 of ANSI/ASHRAE Standard 103-

1988: 

Ls.OI'Fas defined in section 10.10 ofthis 

appendix 

Ll.0f'F8s defined in section 10.11 ofthis 

appendix . 

10.12.1.2 The following supplements the 

definition for the listed value of the jacket 

loss factor C, in section 11.2.11 (and also 

referenced in section 11.3.11.3) of ANSI! 

ASHRAE Standard 103-1988: 

CJ=O.5 for finned tube boilers Intended to be 

installed in ICS applications 

10.12.2 Annual fuel utilization efficiency. 

The AFUE is as defined in sections 11.2.12 

(non-condensing systems) and 11.3.12 

(condensing systems) of ANSI/ASHRAE 

Standard 103-1988. except with the 

following revision to the definition for the 

term EffyHS in the defining equation for 

AFUE: 

EffyHs=heating seasonal efficiency as defined 

in sections 11.2.11 (non-condensing 

systems) and 11.3.11 (condensing 

systems) of ANSI! ASHRAE Standard 

103-1988 and sections 10.12.1.1 and 

10.12.1.2 of this appendix and is based 

on the assumption that all weatherized 

warm air furnaces or boilers are located 

out-of-doors; warm air furnaces which 

are not weatherized are installed as ICS; 

and boilers which are not weatherized 

are installed indoors. 

10.13 Heating seasonal efficiency. steadystate efficiency, and AFUE for noncondensing modulating gas or oil furnaces 

and boilers. The following paragraph is in 

place of the requirements specified in section 

11.4 of ANSI!ASHRAE Standard 103-1988: 

Heating Seasonal Efficiency. Steady-State 

Efficiency. and AFUE for Non-Condensing 

Modulating Gas or Oil Furnaces and Boilers. 

Perform the following calculations to 

determine the steady-state and heating 

seasonal efficiency. Effyss and EffyHS. and 

AFUE. of a 8.as or oil. furnace or boiler. noncondensing. and modulating. The 

calculations in sections 11.4.1 through 

11.4.8.10 of ANSI/ASHRAE Standard 103-

1988 need to be completed at both the 

maximum and reduced input rates for both 

two stage and step-modulating controls. The 

calculations in section 11.4.9 and 11.4.10 of 

ANSIIASHRAE Standard 103-1988 need to 

be completed at the reduced input rate for 

units with step modulating controls. and at 

both maximum and reduced input rates for 

units with two stage controls. Use the 

calculation procedure specified in section 

11.2 of ANSIIASHRAE Standard 103-1988 

including the revisions to section 11.2 as 

specified in sections 10.1 to 10.12 of this 

appendix. and the modifications as specified 

in sections 11.4.1 through 11.4.12 of ANSI! 

ASHRAE Standard 103-1988. 

10.13.1 The definition for EffySS.R in 

section 11.4.8.1.2 of ANSI! ASHRAE Standard 

103-1988 is revised to read as "EffySS.R = as 

defined in section 11.4.7 of ANSI/ASHRAE 

Standard 103-1988." 

10.13.2 Balance point temperature. The 

following calculation procedure supplements 

the procedures specified in section 11.4.8.5 

of ANSIfASHRAE Standard 103-1988: 

IfTe < O. use Te=O. 

10.13.3 Average steady-state efficiency 

for the modulating mode for furnaces and 

boilers equipped with step-modulating 

controls. The following calculation 

procedures supplement the procedures 

specified in section 11.4.8.8 of ANSI! 

ASHRAE Standard 103-1988: 

If Qour.R > DHR. Effyss.M=Effyss.R 

10.13:4 Average heat o~tput rate for the 

modulating mode for furnaces and boilers 

equipped with the step-modulating controls. 

The following calculation procedures 

supplement the procedures specified in 

section 11.4.8.10 of ANSI! ASHRAE Standard 

103-1988: 

If Qour.R > DHR. QoUT .M=Qour.R 

10.13.5 Average part load efficiency. The 

following supplements the definition for the 

listed value of the jacket loss factor C1 in 

sections 11.4.9.2.3. and 11.4.11.1 (and 

raferenced in section 11.4.11.2) of ANSI! 

ASHRAE Standard 103-1988: 

CJ=O.5 for finned tube boilers intended to be 

installed in Isolated Combustion System 

applications 

=1.0 fur finned tube boilers intended to be 

installed outdoors 

10.13.6 Annual fuel utilization efficiency. 

The AFUE is as defined in section 11.4.12 of 

ANSI/ASHRAE Standard 103-1988. except 

with the following revision to the definition 

for the term EffyHS in the defining equation 

forAFUE: 

EffyHS=heating seasonal efficiency as defined 

in section 11.4.11 of ANSIIASHRAE 

Standard 103-1988 and sections 

10.12.1.1 and 10.12.1.2 of this appendix 

and is based on the assumption that all 

weatherized warm air furnaces or boilers 

are located out-of-doors; warm air 

furnaces which are not weatherized are 

installed as ICS; and boilers which are 

not weatherized are installed indoors. 

10.14 Heating Seasonal Efficiency, 

Steady-State Efficiency. and AFUE for 

Condensing Modulating Gas or Oil Furnaces 

and Boilers. The following paragraph is in 

place of the requirements specified in section 

11.5 of ANSIIASHRAE Standard 103-1988: 

Heating Seasonal Efficiency. Steady-State 

Efficiency. and AFUE for CondenSing 

Modulating Gas or Oil Furnaces and Boilers. 

Perform the following calculations to 

determine the steady-state and heating 

seasonal efficiency. Effyss and EffyHS. and 

AFUE. of a gas or oil. furnace or boiler. 

condenSing and modulating. The calculations 

in sections 11.5.1 through 11.5.8.10 need to 

be completed at both the maximum and 

raduced input rates for both two "tage and 

step-modulating controls. The calculations in 

sections 11.5.9 and 11.5.10 need to be 

completed at the reduced input rate for units 

with step modulating controls. and at both 

maximum and reduced input rates for units 

with two stage controls. use the calculation 

procedure specified in section 11.3 and 11.4 

of ANSIIASHRAE Standard 103-1988 

including the revisions to section 11.4 as 

specified in sections 10.13.1 to 10.13.4 of this 

appendix. and the modifications as specified 

in sections 11.5.1 through 11.5.12 of ANSI! 

ASHRAE Standard 103-1988. 

10.14.1 Average part lood efficiency. The 

following supplements the definition for the 

listed value of the jacket loss factor Cl in 

section 11.5.11.1 [abd referenced in section 

11.5.11.2} of ANSI!ASHRAE Standard 103-

1988: 

CJ=0.5 for finned tube boilers intended to be 

installed in Isolated Combustion System 

applications 

10.14.2 Annual fuel utilization efficiency. 

The AFUE is as defined in section 11.5.12 of 

ANSIIASHRAE Standard 103-1988. except 

with the following revision to the definition 

for the term EffyHS in the defining equation 

for AFUE: 

EffyHS=heating seasonal efficiency as defined 

in section 11.5.11 of ANSIIASHRAE 

Standard 103-1988 and sections 

10.12.1.1 and 10.12.1.2 of this appendix 

and is based on the assumption that all 

weatherized warm air furnaces or boilers 

are located out-of-doors; warm air 

furnaces which are not weatherized are 

installed as ICS. and boilers which are 

not weatherized are installed indoors. 

10.15 Optional trocer gas procedure for 

determination of Dp for furnaces or boilers 

employing a power burner or direct vent. The 

following supplements the calculation 

procedures specified in section 11.6.4 of 

ANSIfASHRAE Standard 103-1988: 

If the measured l)p above is less than 0.1. 

then use Dp=().05 as if there is no chance of 

flow through the unit during the off-cycle. as 

specified in section 8.8.3 of this appendix. 

10.16 Tracer gas procedure for· 

determining the off-cycle loss factor ~ for 

atmospheric furnaces or boilers with integral 

draft diverter or draft hood and equipped 

with an electro-mechanicel inlet damper or 

an electro-mechanical flue damper that 

restricts the flow through the heat exchanger 

during the off-cycle. Calculate the off-cycle 

loss factor. ~. defined as the ratio of the offcycle sensible heat loss with the electromechanical damper closed during the offcycle to the off-cycle sensible heat loss with 

the electro-mechanical damper held open 

during the off-cycle: 

~=(Os.OFF with damper closed) I (Os.OFF 

with damper open) 

where: 

=one minute sum-total of the measured 

qS.OFF • .1.t (.1.t=time-step in seconds when 

data are recorded) over a one minute 

interval starting at five minutes into the 

cool-down period 

6. t=time interval between measurement as 

defined in 8.9.5 of this appendix. 

seconds 

1/6O=unit conversion factor to convert time 

in second to minute 

qs.QFF=Cp. mS.OFF· (Ts.OFF-TRAl 

where: 
EE-RM-93-501 COMMENT 00

Federal Register / Vol. 58, No. 161 / Monday, August 23, 1993 / Proposed Rules 44559 

qs.OFFoff-cycle sensible 108s rate. Btulmin 

c.=specific heat capacity ohir. as defined 

in section 11.2.9.1 of ANSUASHRAE 

Standard 103-1988. Btullb. of 

Ts.OFFmeasured stack temperature at time 

t as defined in section 8.9.5 of this 

appendix, OF 

T RA=room temperature as defined in 

section 11.2.5 of ANSUASHRAE 

Standard 103-1988. OF 

mS.OFFUCrm - Cr)/(CT - CTB)) • PI' • VT 

where: 

mS.OFFmass flow rate at time t of the stack 

gas during the off-cycle. Iblmin 

Crm=concantration by volume of 

measurable tracer gas in a certified 

standard tracer gas mixture. percent 

Cr=concentration by volume of tracer gas 

present in the stack gas sample. 

measured at time t+tDELAY. in accordance 

with section 8.9.5 oftbis appendix. 

percent 

tDELAy=tracar gas sample delay time as 

defined in section 8.9.4 of this appendix. 

seconds 

CTB=room background concentration by 

volume of the racer gas used as defined 

in section 8.9.2 of this appendix. percent 

V~f\ow rate of tracer gas into the stack 

measured in accordance with section 

8.9.3 of this appendix, ft 3/min 

PF=density of gas as defined in section 

11.6.2 of ANSII ASHRAE Standard 103-

1988.lb/ft ] 

10.17 Optional procedure for determining 

off-cycle draft factors for furnaces or boilers 

employing a power burner or direct vent. The 

following are revisions to sections 11.7.1 and 

11.7.2 of ANSI!ASHRAE Standard 103-1988: 

10.17.1 Add the word "fector." to the first 

sentence in section 11.7.1 of ANSI/ASHRAE 

Standard 103-1988 so that the beginning of 

the sentence read: 

Calculate the off-cycle draft factor for flue 

gas flow.!)P, defined as: 

10.17.2 The equation for Os for system 

number 8 in section 11.7.2 of ANSI/ASHRAE 

Standard 103-1988. 0s=(00) (Op). is replaced 

with 0s=[(0.79 +Op)/l.4J (00). 

10.18 Procedure for determining off-cycle 

draft factors for atmospheric furnaces or 

boilers with integral draft dlverter or draft 

hood and equipped with either an electromechanical inlet damper or an electromechanical flue damper that restricts the 

flow through the heat exchanger in the offcycle. 

For atmospheric furnaces with an integral 

draft diverter or draft hood and equipped 

with either an electro-mechanical inlet 

damper or an electro-mechanical flue 

damper. and installed as an indoor system or 

an ICS. the System Number and the draft 

factor Dp are defined as: 

System Number=l for indoor system 

=9 for ICS system 

and 

Dp=KL 

where: 

~=off-cycle loss factor. as defined in 

section 10.16 of this appendix. 

10.19 National Average Burner Operating 

Hours. Average Annual Fuel Energy 

Consumption and Average Annual Auxiliary 

Electrical Energy Consumption for Gas or Oil 

Furnaces and Boilers. The following sections 

10.19.1 thru 10.19.3 are in place of sections 

1 thru 3 of Appendix C of ANSI! ASHRAE 

Standard 103-1988: 

10.19.1 National average number of 

burner operating hours. 

For furnaces and boilers equipped with 

single stage controls. the nation81 average 

number of burner operating hours is defined 

as: 

BOHss=2080(0.77)(A)(DHR) - 2080(8) 

where: 

208O=national average heating load hours 

O.77=adjustment factor to adjust the 

calculated design heating requirement 

and heating load hours to the actual 

heating load experienced by the heating 

system 

DHR=typical design heating requirements 

as listed in Table 8 (in unit ofkBtulh) 

of ANSIIASHRAE Standard 103-1988, 

using the proper value of Qoo,. defined 

in Section 11.2.8.1 of ANSI/ASHRAE 

Standard 103-1988 

A=1000001(341300(ypePE + Yla-PEIG + 

y.BE)+(o,N - o,.)eEffyHS1 

B=2Qp(EffyHS)(A)/100000 

l()()()(}():factor that aa:ounts for percent 

and kBtu 

PE=bumer electrical input rate at full-load 

steady-state operation 

yp=ratio of induced or forced draft blower 

on-time to average burner on-time. as 

follows: 

1 for units without post purge 

1+(tP/3.87) for single stage furnaces with 

post purge 

1+(tP/I0) for twa-stage and step modulating 

furnaces with post purge 

1+(tP/9.68) for single stage boilers with 

post purge 

1+(tP/15) for two stage and step modulating 

boilers with post purge 

PE~total electrical power to burner 

equipped with intermittent or 

interrupted Ignition device when the 

device is on. as defined in Section 8.1.1 

of this appendix 

PEIG=PET- PE. electrical input rate to the 

intermittent or interrupted ignition 

device on burner (if employed) 

YIG=ratio of burner intermittent or interrupted Ignition device on time to 

average burner on-time, as follows: 

=0 for burners not equipped with lID 

=(t1G/3.87) for single stage furnaceS 

=(t!d10) for twa-stage and step 

modulating furnaces 

=(t!d9.68) for single stage boilers 

=(tlo/15) for two stage and step 

modulating boilers 

tlo=on-time of the burner intermittent or 

interrupted ignition device. as defined in 

Section 8.1.1 of this appendix 

tp=post purge time as defined in Sections 

8.2 and 8.5 of this appendix 

y=ratio of blower or pump on-time to 

average burner on-time. as follows: 

1. for furnaces without fan delay 

1. for boilers without a pump delay 

1+(t + - t-)/3.87. for single stage furnaces 

with fan delay 

1 +(t + - t - )/10. for two-stage and step 

modulating furnaces with fan delay 

1+(t+ 19.68). for single stage boilers with 

pump delay 

1 +(t + 115). for two stage and step 

modulating boilers with pump delay 

BE=circulating air fan or water pump 

electrical energy input rate at full load 

steady-state operation 

Qu.aas defined in section 11.2.8.1 of ANSU 

ASHRAE Standard 103-1988 

Qp=as defined in section 11.2.11 of ANSl/ 

ASHRAE Standard 103-1988 

EffyHS=as defined in section 11.2.11 or 11.3.11.3 of ANSI!ASHRAE Standard 

103-1988 and section 10.12.2 of this 

appendix. percent, and calculated on the 

basis of: 

=indoor installation. for non-weatherized 

boilers 

=ICS installation. for non-weatherized 

warm air furnaces 

=outdoor installation, for furnaces and 

boilers that are weatherized 

2=ratio of the average length of the heating 

season in hours to the average heating 

load hours 

t+=as defined in sections 9.5.1.2 and 

9.5.2.1 of ANStlASHRAE Standard 103-

1988 

t-=as defined in section 9.6.1 of ANSU 

ASHRAE Standard 103-1988 

For furnaces and boilers equipped with 

two stage or step modulating controls the 

average annual energy used during the 

heating season. EM. is defined as: 

EM=(Qn - o,.)(BOHss)+(8760 - 4600)(0,.) 

where: 

o,N=as defined in section 11.4.8.1.1 of 

ANSI/ASHRAE Standard 103-1988 

Qp=as defined in section 11.4.12 of ANSI! 

ASHRAE Standard 103-1988 

BOHss=as defined above. in which the 

weighted EffyHS as defined in section 

11.4.11.3 or 11.5.11.3 of ANSIIASHRAE 

Standard 103-1988 and section 10.13.6 

or 10.14.2 of this appendix is used for 

calculating the values of A and B, the 

term DHR is based on the proper value 

of Qoo-r defined in section 11.4.8.1.1 of 

ANSIIASHRAE Standard 103-1988. and 

the term (YpPE+YIGPEIG+yBE) In the 

factor A is Increased by the factor R. 

which is defined as: 

R=2.3 for two stage controls 

=2.3 for step modulating controls. when 

the ratio of minimum-ta-maximum 

output is greater than or equal to 0.5 

=3.0 for step modulating controls when 

the ratio of minimum-ta-maximum 

output is less than 0.5 

A=1000001 

(341300(ypPE+YloPEIG+yBE)(R)+(CllN 

o,.)(EffyHSlJ 

EffyHS=as defined in section 11.4.11.3 or 

11.5.11.3 of ANSI/ASHRAE Standard 

103-1988, and calculated on the basis of: 

=indoor installation. for non-weatherized 

boilers 

=ICS installation, for non-weatherized 

warm air furnaces 

=outdoor installation. for furnaces and 

boilers that are weatherized 

876O=total number of hours per year 

4600=as defined in section 11.4.12 of 

ANSIIASHRAE Standard 103-1988 

For furnaces and boilers equipped with 

two stage or step modulating controls the 

national average number of burner operating 
EE-RM-93-501 COMMENT 00

Federal .Register / Vol. 53, No. 161 I Monday. August 23~ 1993 I Proposed Rules 

hours at the redured operating mode is 

defined as: 

BOliR=XREM/o..N •R 

where: 

'Xa=6S aefinoo in ~tWn It.4.&.7 of ANSI! 

ASHRAE StBruiard 103-1988 

EM=as defiued aOOV8 

o..:<.R=as defiaed in section ltA .. 8.1.2 of 

ANSlI ASHRAE Staadard t03-19M. 

For fnmaces and boilers equipped with 

two stage con:trols the;national average 

nwnber of bw:neroper.atiDga-rs at the 

maximum operating mode (BOHH) is defined 

as: 

BOHH=XHEM/QN 

where: 

)4.=as'defined in section 11.4.8.6 of ANSII 

ASHRAE Standard 103-1988 

EM.=as. defined above 

QjN=asdefnredinsection 11.4.6.1.1 of 

ANSf./ ASHRAE Standard 1{)3-1986 

For fumares and.boiUu's etPpped with 

step mCid'u1ating controls. the national average 

numher ofburner operating hours at the 

modulating operating. mode (BOHM ) is 

defined as: 

BOHr.t=N.Ew'CbN.M 

whellil: 

XH=as Sefiusd insedion 11-4.8.6 of ANSII 

ASHRARStandard 103-1988 

EM=8S defined above 

QjN.M=Qrnrr.M/(Effyss.M/1OO) 

QoUT.M=a5 defined in section 11.4.8.10 of 

ANSIIASHRAE StandM"d 19J.49831Uld 

sectitm 18.13.4 efth!S appendix 

Effyss.M=8S defined' in _tion 11.4.8.8 of 

ANSIIASHRAE Stanearo· W3-1!J86.and 

sediOft 1:6:13.3 of this appendix. percent 

l00=fador t!h6t ac::ceuRts tor pet'CfJDt 

1'0.19.2' Average aIlTl1IDf fuel energy for 

gas or ait foelert fimracef{ or boiler:r. 

For fur:naces orboiliers equipped witil 

singf-e stage cont'I:ol's'the average ann't1ld fuel 

energy consumptwn l'EFl i5 expressed in Btu 

per yeanmd defint!d ItS: 

EF=BOHssl<lH - Qp)+876U(Qp) 

where: 

BOHss=a5 defined in section 10.19.1 of this 

appendix 

~s.deined iJl:section 11.2..8.1 of ANSI/ 

ASHRAE Standard 103-1.96B 

Qp=a& Ii.lined in section 11.2..11 of ANSII 

ASHRAE StaP.derd lQj.::.l98a 

876o.=as.d&fine<lin section 10-.19.1 of this 

appendix 

For furnaces or boilers equipped with 

eithe!.' twe stage 01' stet>modtttating.controls 

EF is defined as: 

EF=EM+46OO(Qp) 

where: 

EM=as defined in section 10.19.1 of this 

appendix' 

46()();:as defined in section 11.4.12 of 

ANS11 ASHRAE Standard 103-t98'8 

Qp=at! defined in section 11.2;n of ANSI! 

ASHlltAE Standard 163-1933 

10.14.3 AvemgeallltlUl1_iJimy 

electrical energy consumpl!iefJ fior fIlS fJr oiJ 

fueled fimtacetJ 01" boiHm;. f6F furnaces or 

boilers equipped with shtgle ~ ~s 

the average-lm'llUal' IHUIDary efet'.:tricat 

consnmptiOl'l (E'"d is ""fIFeSsed iD kilowatthours and I'Iefineft as: 

EAE=BOHss(ypPE+y,oPE,o+yBE) 

where: 

BOHss=as defined in section 10.19.1 afthis 

appendix 

PE=as MfirHld in secti_ ~ 1.2'.:1 01 ANSII 

AS?IRA:fi Slastdard ~t!J8& .. 

yp=as~ m sedie& lQl~.l ort~ 

append'f!It 

y,o=as defined in section 10.19.1 afthu 

appendix 

PEro=m! defined' il't sec1io@m lO.l!J.l gf dRs 

appemfut 

)"=1IS t'WiRed! in secti01'l lO.l9-.1 of l'his. 

appendiox 

BE=as defined in sectieD It.l.2.2 01 ANSI! 

ASHRA~Stan6an:t 1IO:J-IHB 

For furnaces or boit'ers lIiJIlipped with two 

stage controls EA!; i'sdefinedas; 

EAE=BOHR(YPI'ER + YIGI'EIG + yBEiJ. + ~.yPP&l + yJEK; ... yJilEj,J 

where: 

1ilOHa.=as.defiued insecti<ta 111.19..1 ~ this 

appeooUi 

yp=as defined in section 10.19.1 of this 

appendix 

PEg=as.EkafHWfi ill sectien 9.1;2.2 illiG 

measured at the reduced fuel i.up1&t rate. 

of ANSII ASHRAE. Standald li)3-1I9i8 

YIG=as defined in sectWn 10.19.1 gf this 

appeRQi.x: 

PE,o=6s defined in section 10.19..1 of this 

apperu.lj" . 

y=as defined in section lQ..19.1 of this. 

appeod.i.x 

BER=as definee;i ill Slid.iDu.9..1.L2 aDd. 

measw:ed. at the· reduaId ful iAput J:ate. 

of ANSUASHR.AE.~ 103-1988 

BOHH=as 

~ 

defined in sedio.a 10.19.1 oCthis 

PEH=a& defined ill sectioa 9.1.2.2lWd 

measured at the IBa!XiIm.un fuel input 

rate, of ANSllASHRAE Staailard 103-

19B& 

BEu=as defiseli in sectiou. 9..l..2.2. and 

measured at tbe JDaximum fuel inpI.lt 

rate. of ANSUASHRAE SJiam.d.aId 103-

1988 

For furnaces or boilns equipped witt! step 

modulating t:0RblDIs ~ is dlefiueG as; 

EAE=BOHR(ypPER + y,oPElCO + yB~J + 

BOlia(ypPEw + yKiP&G -+ yBEw). 

where: 

BOHR=as defiaed In sectiolllQ. 1'!.1 of this 

appendix 

vp=as defined in sediao. 10.19.1 of th.is - appendix 

i'ER=as defined IIihow 

Yi6=llS de&ed in sectiOR: t{U9..1 of this 

8'l'PfI'Il~ 

PE1G=as defined m section 19.19.1 of tftis 

appendix 

y=as defined in section 1'0.19-.1 oftftis 

appendix 

BER=as defined' above 

BOHM=as defined in section 1n. t9.1 of this 

awendix 

PEH=as defined above 

BEw=as defilled above 

10.20 Av.eR/8fHInD.W1l eJedric-energy 

consumptioo fee eIecI.&iI;: ~ gr bQjJers. 

For elect:cie: fwa&alS aad 00WeES: IiIw average 

annual eDel'8Y QIP8!~ ~ iIS expressed 

in kiJewatt...hours ImIi liefined as: 

EE=100(2080no.77)(DHR) f 3.4U (AFtJE) 

where: 

100=10 express a percent as a decinlaf 

2080=85 defined in section 10.19.1 oftbis 

appendix 

O.77=as defined in section to.19'.1 of this 

appendix 

DHR=86 defined in section 10.19.1 of this 

appendix . 3.413=conversion to express energy in 

terms ofwatt·homJs instead of Btu 

AFUE=6sdefi.aed iasec1ion 11.1 of ANSI! 

ASHRAE Stlmdard 103-1988. percent 

HUl Ener&Y Factor. 

10.21.1 Energy factor for gQ6 «oil. 

furnaces ud beilBrs. The ell8l&Y.factorjor 

gas or oil furnace& aali Boilers. iIS 4Ie:.ined as 

the ratiQ.of thftsum of the u.sefu.l annual 

fosSil fueleD/ill&Y delivered to the. building 

space as beat ad the auxiliary electrical 

energy that is NCfMlreci as usable- heat. to the 

sum of tile ......t foasil fuel eaergy 

COIl8Uf114l&a ed the eD8I&Y Deeded at tIw 

power plant to generate the awdlillEY 

electr:ic.a 8IleIIY CIOIISumeci t.y aile appliGce. 

The above definition of e....,. IBct.vr is based 

upon the tIemJ III8I..t. as. _BIIII efficieftcy 

eJleq.)f factor ud defined .. equQQa (1} in 

appmdix B of ANSllASlfW\B Stamlard 193-

1988. using the IIIII1IIBg4t ta.Ber operIIIti..DIJ 

OOUl'S. ~ ...... liIIelenergy fur gas or 

oil fueled fIInlams or IIoiIms &1. II'IfI!II'lIge 

annwd auxim.y eIecIdcal8MI&'J 

con~ for PIlat: oil faded fuma£es or boilers {E ... td. asdIefineU insedioBs 1tUlt. 

10.19.1. 1O.tlU, and sectioaIfU9.3. 

respectively, of dUs appeadioc.. The fDllIDwing 

paragraphs specify the procedure for the. 

cakufMioll erEP a.j • ill place of Appeadix 

B of ANSlfASHRAES't!ancIud lfB-198&,.d 

include II; co~ of a syntax errer 

contained in equatioft fll of appendix B of 

ANSlI J\SRIVdi StMtdtrrtI1f&.l~. Tile 

energy factor whiclt incorporates. russR fuels 

and electrical energy as described m section 

10.19 of this ItPfM'llKlix. is clem-! as. iu. 

percent: 

EF AFUE/1OO+3413y BEBOH 100 EF= X 

EF +3413FEAE 
EE-RM-93-501 COMMENT 00

Federal Register I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 44561 

where: 

l00=factor that accounts for percent 

Er=average annual fuel consumption as 

defined in 10.19.2 of this appendix. 

EAE=88 defined in section 10.19.3 of this 

appendix. 

AFUE=AFUE as defined in sections 

11.2.12,11.3.12,11.4.12 and 11.5.12 of 

ANSIIASHRAE Standard 103-1988, 

percent, and calculated on the basis of: 

=indoor installation, for non-weatherized 

boilers 

=ICS installation, for non-weatherized 

warm air furnaces 

=outdoor Installation, for furnaces and 

boilers that are weatherized 

y=88 defined 10.19.1 of this appendix 

BEBOH=(BE)(BOHss) for units with single 

stage controls 

=(BERl(BOHRl + (BBH)(BOHttl for units 

with two stage controls 

=(BE.)(BOHRl + (BEttl(BOHM ) for units 

with step modulating controls 

BOHss=as defined in section 10.19.1 ofthis 

appendix 

BOHR=as defined in section 10.19.1 ofthis 

appendix 

BOHH=as defined in section 10.19.1 of this 

appendix 

BOHM =88 defined in section 10.19.1 of this 

appendix 

BE=8S defined in section 10.19.1 of this 

appendix 

BE.=as defined in section 10.19.1 oftbis 

appendix 

BEH=as defined in section 10.19.1 orthis 

appendix 

F=ratio of the energy consumed at the 

source of electrical generation to the 

electrical energy delivered at the furnace 

or boiler,=3.37 

3413=eonversion factor from kilowatt to 

Btu/h 

10.21.2 Energy factor for electric furnaces 

and boilers. The energy factor for electric 

furnaces and boilers is defined as: 

EF=AFUE 

where: 

AFUE=AFUE as defined in section 11.1 of 

ANSIIASHRAE Standard 103-1988, 

percent, and calculated on the basis of: 

=indoor installation, for nonweatherized 

boilers 

=ICS installation; for non-weatherized 

warm air furnaces 

=outdoor installation, for furnaces and 

boilers that are weatherized 

10.22 Average Annual Energy 

Consumption for Furnaces and Boilers 

Located in a Different Geographic Region of 

the United States and in Buildings with 

Different Design Heating Requirements. 

10.22.1 The following legend is added to 

Fig. G-1 of ANSIIASHRAE Standard 103-

1988: 

Alaska-3500 HLH 

Hawaii and Territories--O HLH 

10.22.2 Average annual fuel energy 

consumption for gas or oil fueled furnaces 

and boilers located in a different geographic 

region of the United States and in buildings 

with different design heating requirements. 

For gas or oil fueled furnaces and boilers the 

average annual fuel energy consumption for 

a specific geographic region and a specific 

typical design heating requirement (EFR) is 

exprassed in Btu per year and defined as: 

EFR=((EF-8760 0,.) HLH 12080)+8760 0,. 

where: 

EF=8S defined in section 10.19.2 of this 

appendix 

876O=&s defined in section 10.19.1 of this 

appendix . Qpc:as defined in section 11.2.11 of ANSI! 

ASHRAE Standard 103-1988 

HLH=heating load hours for a specific 

geographic region determined from the 

heating load hour map in Figure G-l of 

ANSIIASHRAE Standard 103-1988 and 

in section 10.22.1 of this appendix 

2080=as defined in section 10.19.1 of this 

appendix 

10.22.3 Average annual auxiliary 

electrical energy consumption for gas or oil 

fueled furnaces and boilers located in a different geographic region of the United 

States and in buildings with different design 

heating requirements. For gas or oil fueled 

furnaces and boilers the average annual 

auxiliary electrical energy consumption for a 

specific geographic region and a specific 

typical design heating requirement (EAER) is 

exprassed in kilowatt-hours and defined as: 

EAER=EAEHLH 1 2080 

where: 

EAE=8s defined in section 10.19.3 oftbis 

appendix 

HLH=as defined in section 10.22.2 of this 

appendix 

2080=as defined in section 10.19.1 of this 

appendix 

10.22.4 Average annual electric energy 

consumption for electric furnaces and boilers 

located in a different geographic region of the 

United States and in buildings with different 

design heating requirements. For electric 

furnaces and boilers the average annual 

electric energy consumption for a specific 

geographic region and a specific typical 

design heating requirement (EERlls expressed 

in kilowatt-hours and defined as: 

EER=100(0.77)(DHR)(HLH)/3.413 AFUE 

where: 

100 = as defined in section 10.20 of this 

appendix 

0.77 = as defined in section 10.19.1 of this 

appendix 

DHR = as defined in section 10.19.1 of this 

appendix ' 

HLH = as defined in section 10.22.2 of this 

appendix 

3.413 = as defined in section 10.20 ofthis 

appendix 

AFUE = as defined in section 11.1 of ANSII 

ASHRAE Standard 103-1988, percent 

10.23 Annual Efficiency for Gas or Oil 

Furnaces and Boilers other than Mobile 

Home Furnaces. The Annual EffiCiency is 

defined as the ratio of the sum of the useful 

annual fossil fuel energy delivered to the 

building space as heat and the auxiliary 

electrical energy that is recovered as usable 

heat, to the sum of the annual fossil fuel 

energy consumption and the energy needed 

at the power plant to generate the auxiliary 

electrical energy consumed by the appliance. 

(The equation defining Annual Efficiency Is 

in section 10.23.4 of this appendix.) The 

above definition of Annual EffiCiency is 

based upon the term named as seasonal 

efficiency, energy factor, and defined as equation (1) in appendix B of ANSI/ASHRAE 

Standard 103-1988, using the average burner 

operating hours, average annual fuel energy 

for gas or oil fueled furnaces or boilers (EF), 

average annual auxiliary electrical energy 

consumption for gas or oil fueled furnaces or 

boilers (EAE), as defined in Appendix C of 

ANSI/ASHRAE Standard 103-1988. The 

definition of Annual Efficiency is comparable 

to the energy factor defined in section 10.21 

of this appendix, with the exception that for 

non-weatherized furnaces, Annual EffiCiency 

is calculated on the basis of indoor 

installation. The following paragraphs 

specify the procedure for the calculation of 

Annual EffiCiency and are in place of 

appendix B and appendix C of ANSI! 

ASHRAE Standard 103-1988, and include a 

correction of a syntax error contained in 

equation (1) ofappendix B of ANSIIASHRAE 

Standard 103-1988. 

10.23.1 National average number of 

burner operating hours. Same as in section 

10.19.1 ofthis appendix except the term 

EffyHS used in the calculations for the burner 

operating hours is defined as: • 

For furnaces and boilers equipped with 

single stage control: 

EffyHs=as defined in section 11.2.11 or 11.3.11.3 of ANSII ASHRAE Standard 

103-1988, percent, and calculated on the 

basis of: 

=indoor installation, for non-weatherized 

units with system number 1, 2, 3, 4, 5, 

6, or 8 that use Indoor combustion air, 

and for direct vent units with system 

number 9 or 10 

=outdoor installation, for units with system 

number 9 or 10 that are weatherized 

For furnaces and boilers equipped with 

two stage or step modulating controls: 

EffyHS=as defined in section 11.4.11.3 or 11.5.11.3 of ANSI/ASHRAE Standard 

103-1988, percent, and calculated on the 

basis of: 

= indoor installation, for non-weatherized 

units with system number 1,2,3,4.5, 

6, or 8 that use indoor combustion air, 

and for direct vent anits with system 

number 9 or 10 

= outdoor installation, for units with system 

number 9 or 10 that are weatherized 

10.23.2 Average annual fuel energy for 

gas or oil fuelod furnaces or boilers. Same as 

in section 10.19.2 ofthis appendix except 

that the burner operating hours Is computed 

as defined In section 10.23.1 ofthis 

appendix. 

10.23.3 Average annual auxiliary 

electrical energy consumption for gas or oil 

fueled furnaces or boilers. Same as in section 

10.19.3 of this appendix except that the 

burner operating hours is calculated as 

defined·in section 10.23.1 of this appendix. 

10.23.4 An Annual Efficiency which 

incorporates fossil fuels and electrical energy 

as described In sections 10.23.2 and 10.23.3 

of this appendix, is defined as, in percent: 
EE-RM-93-501 COMMENT 00

44562 Federal R.egister I Vol. 58, No. 161 I Monday, AugU6t 23., 1993 I Proposed RuMs 

AE= EF AFUE*Il00+3413yBEBOH xlOO 

EF + 3413 F E A.E. 

where: 

100=6ictor that accmmts for pettent 

&=average annual fuel consumption as 

defined in section 10.23.2 of this 

appendix. 

EAE=$ defined ill section 10.23.3 of this 

appendIx. 

AFUE.'*=AFUE as defiDed in sections 

11'z.1Z, 11.3.12. 11.4.12 and in section 

11.5.12 of ANSI! ASHRAE Standard 103-

1988. percent. and calculated on the 

basis of: 

=i.n.door installation. fur non-weatherized 

units with Sfstem number 1. 2.3. 4. 5. 

6. or 8 tlwt use l.ndeor combuatiQn air, 

and fur direct vut units with systam 

number Q or 10 

=outdoor installation, fur units with 

system number 9 or 10 that are 

weatherized 

y=as defined in section 10.19.1 of this 

appendix 

iEBOH=(BB)(BtlIi.l for units with single 

stage controls 

=(BEa)(BOHRl ... (BBW.(BOHaU for units 

with two stage controls. 

=(BERl{BQHRJ ... (BEu)(BOHwl for units 

with step modulating controls 

BOH.ss=as defined. in section 1Q.23.1 of this 

appendix 

BOHa=as defined in section 19.23.1 of this 

appendix 

BOHtr=aa EIafilaed iD. section 10.23.1 of this 

aptMmdix 

BOH.t=88 detin8d iB section 10.23.1 of this 

appendix 

Bi=as def:iaed in sectian 11'1. HU of this 

appendix 

OOIl=8S defined in sectioD 10.19.1 oHMs 

appendix 

BEfFIIS defu:led ill section 10.19.1 af this 

appendix 

F=as dBfined in section 19.21.1 of this 

appendix. 

3413=COllwrsiOll factor from kilowatt tD 

Btn/b 

10.24 Annual efficiency for elflCll'k 

furnaces ami boiJ.ers; The A.amIal Efficincy 

for elactric: _maces. and boi1en ill defiDecl as: 

AE=AFUE'" 

where: 

ARJE* =AFUE as de.fmed in section 11.1 of 

ANSl/ ASli'RAE Standanl103-1988. 

percent. awl alcula.tad 011 the basis of: 

:indoor installation. for DElIl-waatheci%ed 

warm air furnaaIs and· bollers 

=out.IikJor instail4Won. for famaces and 

boilers that are weatheri.z.ed. 

10.25 Annual efficiency for mobile home 

furnaces. Ta& Annual Efficiency for mobile 

home furnaces. is defined as the tatio of the 

sum of th.& useful amwal fussil tuel energy 

delivered to the building space as heat and. 

the auxiliary electrical energy thet is 

recovered as usable heat. to the sum of the 

annual fossil fuel. eIlergy consumption and 

the anergy needed af the power prant to 

generate tke auxiliary electricel energy 

consumed by ~ appliaac& TAO. abI:Jve 

defiBitio& of A1mueJ Biiic:ieoc1 is the same 

as the JmmIld Eftid.eaq cleArwd Gad 

calculated in S8CI'ikln w.2'3 Elf Ibis appendrilx, 

excepf that Annual Eftic::iency fat mobile 

home furnaces is limited to those systems 

specificaUy ~ falo l8'lIIiik!:a-and are installed indoors and: UIMt GRlidi8 air. 

combustioo. 

10.25.1 Natiolwl~lRSIffberof 

purner opeMfiDgliaun fW RIOb.i.lllt hamlJ 

fu17KlCflS. same as in sec:u- UU9.1 of this 

appendix. except that the vaha OfBffJRS ill 

the calcullltioa of tIla tiumer opu:ating boars 

is calculated on the Dalia IIIf a. direct vUDhmit 

witll S¥Stem ~ oc 18 and imtal1ed 

indoors. 

10.25.2 AtlemgeCl.1NDRal fu.et~ for 

mobile home furnaces. Same as ia.SBCtion 

1IJ.23..2 of tbiuppeud.ix except tilat tJw. 

burner operating hours is calculated as 

specified in: sectioll 1(U5..1 crf dais appeDd1:x. 

10.25.3 Average annual auxiliary' 

ehectrical energy coasunrptSc. fa6 IDDbUe 

home furnaces. Same as in section 10.23.3 of 

this apperuiiix _pt that tbit bUl'll« 

operating hours is calculated al! specified in 

section 10.%5.1 of this appeadix. 

10.25.4 Annual efficiency for mt:JIiJil6 

hol1Rt furnaces. The ADlHulii Eifu:ieacy for 

mobile home furnaces. which incmpomtBs 

fossil fuels and elec:trical 6Il8I8Y aa described 

in section lQ.25 of this appendix. is defined 

as, in percent: 

where: 

AE = EF AFUE*'lOO+ 3413 Y' BEBOH xl 00 

EF +3413F EAE 

100=factor that accounts for percent 

EF=8l!8f1188 annual fuel cnnsumption as 

defined in sectioll1D.25.2 of this 

appeBdix. 

EAE=&IiI defined. ill sectio1110'25.3 of this 

appendix. 

AFUE*=AFVE aa defined iI1 sectiOI1S 

11.2..12-, 11.3. n. 11.4.12 and 11.5.12 (ilf 

ANSII.AS.HRAE Standard 1Q3-1968. 

parcant. and calctrlated on tb8 basis of a 

direct vent unit with system nwnber 9 or 

10 and installed indoors 

y=as defined in section 10.19.1 of this 

appendix 

BEBOH=(BE)(BOHss) far units with single 

st. E:QIrtrQIs 

=(~(BOHRJ+{BEH){BOHH) for units with 

twa stage-controls 

=(BER)('BO'tfR)+(BEH)~ f6l' units with 

step modulating controls 

BOHss=a8 defined in section 10.24.1 of this 

appendix 

BOHR=as defined in section 10~24.1 of this 

appendix 

BOHH=as defined in section 10.24.1 of this 

appendix 

BOH",=as defined in section ltl.24.1 ofthi~ 

appendix 

BE=as defined in section 10.19'.1 of this 

appeadix 

BER=as defined in section 10.19.1 of this 

appendix 

BEH=as defined in section 10.19.1 of tkill 

appendix 

F=as defined in section 10.21.1 of this 

appendix 

3413=conversion factor from kilowatt to 

Btu/h 

10,26 Calculation of sales weighted 

average wllmal eJlergy consumption for 

mobile home furnaces. In order to reflect the 

distribution of mooiJe banes tg geographical 

regiol1S with average HLHwHF value diffamnt 

from 2080. adjust the 8Ilnual fessi.l fuellllld 

auxiliary electrical energy consumption 

values for mobile home rumftCtIS using the 

following adjustment calculations. 

10.26,1 For mobile home furnaces the 

sales weighted average annual fossil fuel 

energy CORSumptiOD is. axptreseed in Btu per 

year aDEi defined as: 

EF.~I" - 87fiO Qrl HLH_I 2080 ... 

8760Qp 

where: 

EF=as defiaed ill section 10.25.2 of this 

appendix 

8760=as defined iB sectiQn 10.19.1 of this 

appendix 

Q,.=as defined· in section 11.2.11 of ANSl/ 

ASHRAE StandarQ 103-1988 

HLHMHF11t60. sales weiabted avenp 

heatiag load bl!1ura flilrnmbiJehome 

fu:rnefi:t!S 

2080=a8 defined in section 10.19.1 ofthis 

appendix 

10.26.2 For nmhile home furnaces tM 

sales weishted awrap annual auxiliary 

electrical tmll1'8Y conswnption is expressed in 

kilowlitt-holirs and defined' u: 

EAE.MHFlE'AE) (HU4!HFll 2080 

where: 

EAE=as defined in section 10.25.3 of this 

appendix 
EE-RM-93-501 COMMENT 00

Federal Register I Vol. 58, No. 161/ Monday, August 23. 1993 I Proposed Rules 44563 

HLHMm=as defined in section 10.2S.1 of 

this appendix 

208O=as defined in section 10.19.1 of this 

appendix 

10.27 The functions F5. FS. and F8 in 

Appendix E of ANSI! ASHRAE Standard 103-

1988 contain typographical errors iu the 

equations as they appear iu the ANSI! 

ASHRAE Standard 103-1988. The following 

term is substituted for I'I'F.oeexp( - tlToFFHo.56 

(in F5 and FS) or l'I's.o"6Xp( -tlToFF))O.56 (in 

F8) where the term (+ 28) is missinS. The 

substituted term is: 

I'I'F.oeeXP( -tlToFF) + 28))0.56 (in F5 and FS) 

or 1'I's.oeexp( - tltoFF) + 28))0.56 (in F8). '. 

The complete corrected equations for F5. 

FS and F8 are presented in Table 2 of this 

appendix for information only. 

10.28 Direct determination of off-cycle 

losses for furnaces and boilers equipped with 

thermal stack dampers. 
EE-RM-93-501 COMMENT 00 

44564 Federal .Register I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 

Table 1 System Numbers 

locate the column where all the characteristics are applicable to the unit under test 

Characteristic 2 3 4 5 6 8 9 10 

Indoor Combustion Air 

Outdoor, Direct Vent or Isolated 

Combustion System 

Direct Exhaust 

Draft Hood or Draft Diverter 

Barometric Draft Control 

Electrical/Mechanical Stack 

Damper 

Atmospheric Burner 

Power Burner 

Burner Inlet Damper or Flue 

Damper ** 

0, 

• 

S/F 

x 

x 

x 

x 

• 

x 

x 

x 

x 

0.4 

or 

Dp 

• 

x 

x 

x 

x 

0.4 

or 

Op 

x 

x 

x 

x 

0.4 

or 

Do 

0.85 or 

0.79+0p 

1.4 

1.4 or 

tesU 

x 

x 

x 

x 

* 

x 

x 

x 

x 

0.4 

or 

be 

* 

x 

x 

x 

x 

0.8500 

or 

(0. 79+0pl!4, 

1.4 

1.4 or tesU 

x x 

(Hay or may not 

be present. 

Does not affect 

the results.) 

x 

x 

or 

DJ::t 

x 

x 

0.4 

or 

Dp 

• = Calculated from CD2 values. * = For atmospheric burner w/burner inlet damper or flue damper which closes within 10 seconds after the 

burner shuts off. ** = For direct vent, or atmospheric bUrner w/burner inlet damper or flue damper which closes within 10 

seconds after the bUrner shuts off . • * = Power burner mayor may not have an electro-mechanical inlet or flue damper. 

BILUHG CODE MIO-0100C 
EE-RM-93-501 COMMENT 00

Federal Register / Vol. 58, No. 161 / Monday, August 23, 1993 I Proposed Rules 44565 

TABLE 2.-FoRMULAS FOR THE FUNCTIONS F5. F6, ANOF8 

(

'II S,Oe T~ + 128 .. )0.56 

1 tOFF 

Fs('IIS.o,tOFF/,oFP) = ( )! TOFF ~(---t -~)-=-1.""""19 100 toFF/rOFF ° 

'II F.Oe TOFF + 630 

BILUNG CODE &4S(HI1-P 

[ 

t J

O

.

56 

'II F.Oe TOFF + 28 "F.Oe 

( 

t JI.l9 

'II F.Oe TOFF + 530 

( 

t )0.56 

IJI S,Oe TOFF + 28 

( 

t )1.19 

IJI S,Oe TOFF + 530 

d_t _ 

'OFF 

d_t _ 

'OFF 
EE-RM-93-501 COMMENT 00

44566 Federal R.egister I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 

Recirculation 

line 

Water 

supply ~ 

Shut 

. off 

I---i~---L----t 

Check 

Overflow 

Outlet water 

temp.(within 12") 

r-- --- Inlet water 

Mixed 

temp. 

Insulated 

constant 

head tank 

I I, I temp.(within 18") . I Test I 

Pump 

Flow 

regulating 

valve : boiler I 

I I 

_~ : ______ -L I ______ _ 

Figure 1. Suggested piping arrangement 

for hot water boilers 

... 

............. 
EE-RM-93-501 COMMENT 00

Federal Register I Vol. 58, No. 161 I Monday, August 23. 1993 I Proposed Rules 44567 

A = Inside blower door 

B = Internal section of vent pipe (Uninsulated) 

C = Blower access door 

0= Flue collar 

E = Top of unit, vent connection 

F = Diverter box or inducer motor 

Air .flow 

Inlet duct ® 

I, " I I 

I I I 

@--+i I I I 

I I I 

~ 

I I , 

I I , 

Heat exchanger and 

combustion area 

Outlet duct 

. 

Air • flow 

Figure 2. Jacket loss 

down flow unit 

BILLING COOE 1145CH11-C 
EE-RM-93-501 COMMENT 00

44568 Federal itepIIer I Vol. 58, No. 161 I Monday, August 23. 1993 I Proposed Rules 

5. Appendix 0 to Subpart B of Part 

430 is amended as follows: 

Appendix 0 to Subpart B of Part 430-

URit'orm Test Method for Measuring the 

Energy Consumption of Vented Home 

Heating Equipment 

8. Section 3.5 is revised and sections 

3.5.1 and 3.5.2 are added to read as 

follows: 

3.5 Pilot light measurement. 

3.5.1 Measure the energy input rate to the 

pilot light (OJ.) with an error no greater then 

3 percent for vented beaters so equipped. 

3.5.2 For manually controlled beaters 

wt>ere the pilot light is designed to be turned 

off by the user when the beater is not in use 

and instruction to do so Is given on the 

heater near the gas control valve (e.g. by 

label) by the manufacturer. the measurement 

of Qp need not be performed. 

h. Section 4.2.4 is revised to read as follows: 

4.2.4 Weighted-averoge steady-state 

efficiency. 

For manually controlled heaters with 

various input rates the weighted average 

steady-state efficiency (TJSS.WT). Is: 

(1) At 50 percent of the maximum fuel 

input rate as measured in eithenecticm 3.1.1 

to this appendix for manually controlled gBII 

ven ted heaters or section 3.1.2 to this 

appendix for manually controlled oil vented 

heaters. or 

(2) At the minimum fuel input rate as 

measured in either section 3.1.1 to this 

appendix for manually controlled gas vented 

heaters or section 3.1.2 to this appendix for 

manually controlled oil1ll8ntad htl8len if Ute 

design of the lHtale!" is \!JUch that the 50 

percent of the IDIIXimwn fIlel.iup1It nlte 

cannot be set. provided this minimum rate is 

no greater than % of maximum IRpUt rate of 

thehea ..... 

For manually controlled beater with one 

single firing rete tlHt weighted ave .. steadystate efficiency is the steady-state effiCiency 

measured at the single firing rate. 

c. Section 4.2.6 is revised to read as follows: 

4.2.6 Annual fuel utilization effICiency. 

For manually controlled vented heaters. 

calculate the AFUE expressed as a percent 

and defined as: 

2950 l1ssQi.a-_ AFUE=------------------------

where: 

295O=average number of heating degree 

days 

TJss=8S defined as TJSS.WT in section 4.2.4 of 

this appendix 

'l.,=8S defined In soction 4.2.5 of this 

appendix 

0..-:88 defined as Q.. at the maximum 

fuel input rate. as defined in section 3.1 

of this appendix 

46OO=average number of non-healing 

eeason hours per year 

2950 l1ssQin-max +2.083(4600) l1u Qp 

Qp=as defined in section 3.5 01 I his 

appendix 

2.083=(65 -15) I 24=50/24 

65=degree day base temperature. OF 

15=national average outdoor design 

temperature for vented heaters lIB 

defined in section 4.1.10 ofthis 

appendix 

24=number of hours in a day 

For manually controlled V1lnl8d heaters 

where the pilot light can be turned off by the 

USef when the heater is not in use as 

described in section 3.5.2. calculate AFUE 

expressed as a percent and defined as: 

AFUE=TJ. 

where: 

TJ.=as defined in section 4.2.5 of this 

appendix 

d. Section 4.3.7 is revised to read a8 

follows: 

4.3.7 Annual Fuel Utilization EffICiency. 

Calculate AFUE expressed as a percent and 

defined as: 

AFUE = 2950 l1ss-WT l1u Qin-max 

where: 

2950=average number of beating degree 

days 

TJss-wr=as defined in section 4.1.16 ofthis 

appendix 

TJ.=as defined in section 4.3.6 of Ihis 

appendix 

Q.._mu=IlS defined in section 4.2.6 ofthis 

appendix 

4600=85 defined in section 4.2.6 of this 

appendix 

Qp=as riefined in section 3.5 of this 

appendix 

2.083=a8 defined in sechon 4.2.6 oflhis 

appendix 

e. Add Sections 4.6. 4.6.1. 4.6.2. 4.6.3. 

4.6.4.4.6.4.1. and 4.6.4.2 after section 

4.5.3 and before the tables to read as 

follows: 

4.6 Annual Efficienc.v. 

An Annual Efficiency which incorporates 

fossil fuels and electrical energy. is defined 

as, in percent: 

AE=1001e[(EJ01(AFI:El100}+3413(P, )!BOHlIl 

!E~-+3413(?HEAE)J 

where: 

2950 l1ss-WT Qin-max +2.083(4600) l1u Qp 

EAE=as defined in section 4.6.3 oftMs 

appendix 

EI'=average annual fuel consumption as 

defined in section 4.6.2 of this eppendix 

AFUE=AFUE as defined in sections 4.1.17. 

4.2.6. and 4.3.7 of this appendix. percent 

PE=Auxiliary electric energy input rate as 

defined in section 3.1.3 oflhis appendix 

BOH=National average number of burner 

operating hours. definnd in section 4.6.1 

of this appendix as: 

:.(BOHss) for units with single stage or 

manual controls . 

=(BOH.,+BOHH ) for units with two stage or 

step modulating controls 

F=the ratio of the energy consumed at the 

source of electrical generation to the 

electrical energy delivered at the vented 

heater. =3.37 

3413=conversion factor from b;owalt to 

Btu/h 

4.6.1 National average number of bilmer 

operatmg hours. For vented heaters equipped 

wiln single stage controls or manual ccntrols. 

the national flH5rage number of burner 

operating hours is ddined as: 

BOHss=1416(A,J(. ... )(DHR) ~4~f,:l3] 

where: 

1416=national average beating load bours 

for vented heaters based on 2950 degree 

days and 15 OF outdoor design 

temper1rture 

At=O.6858. adjustment factor to adjust the 

calculated design heating requirement 

and heating load hours to the actual 

heating load experienced by tbe heating 

systlllIl 

DHR=typica\ design heating requirements 

based on QoUT. from Table 4 of this 

appendix. 

QOUT=HTJssil(0) - Y(L;ll00)j.(Ginl 

l.j=jacket loss as defined in section 4.1.5 of 

this appendix 

Y=2.8. adjustment factor as defined in 

section 4..3.6 of this appendix 

TJss=steady·state efficiency as defined in 

section·4.1.10 of this appendix. percent 

Q,.=as defined in section 3.1 oftMs 

appendix at the maximum fuel input role 

A:l00000/[341300(PE)+(Giu - QpHTJ.ll 

B=2.938(Qp)(T]u)(A]/l00000 

100000=factor that accounts for percellt 

and Kbtu 

P~=as defined in section 3.1.3 of this 

appendix 
EE-RM-93-501 COMMENT 00

Federal Register / Vol. 58, No. 161 / Monday, August 23, 1993 / Proposed Rules 44569 

Qp=as defined in section 3.5 of this 

appendix 

llu=8S defined in section 4.3.6 of this 

appendix for vented heaters using the 

tracer gas method. percent 

=as defined in section 4.2.5 of this 

appendix for manually controlled vented 

heaters. percent 

=AFUE (2950)(llss)(Q,,)/[(2950)(llss}(Cl!o) 

AFUE (2.083)(4600)(QP)] for vented 

heaters without manual controls and 

without thermal stack dampers and not 

using the optional tracer gas method. 

where AFUE = as defined in section 

4.1.17 of this appendix. percent 

2950=average number of heating degree 

days as defined in section 4.2.6 of this 

appendix 

4600=average number of non-heating 

season hours per year as defined in 

section 4.2.6 of this appendix 

2.938=(4160/1416)=ratio of the average 

length of the heating season in hours to 

the average heating load hours 

2.083=as defined in section 4.2.6 ofthis 

appendix 

For vented heaters equipped with two 

stage or step modulating controls the national 

average number of burner operating hours at 

the reduced operating mode is defined as: 

BOHR=XIEM/~ln 

where: 

Xt=8S dermed in section 4.1.14 of this 

appendix 

~In=as defined in section 4.1.11 of this 

appendix 

EM=8Verage annual energy used during the. 

heating season 

=(Q" - <lJ.)(BOHss)+(8760 - 4600)(<lJ.) 

Q,,=8S defined in section 3.1 of this 

appendix at the maximum fuel input rate 

Qp=as defined in section 3.5 of this 

appendix 

BOHss=as defined above. in which the 

term PE in the factor A is increased by 

the factor R. which is defined in section 

3.1.3 of this appendix as: 

R=1.3 for two stage controls 

=1.4 for step modulating controls when the 

ratio of minimum- to-maximum fuel 

input is greater than or equal to 0.7 

=1.7 for step modulating controls when the 

ratio of minimum- to-maximum fuel 

input is less than 0.7 and greater than or 

equal to 0.5 

=2.2 for step modulating controls when the 

ratio of minimum- to-maximum fuel 

input is less than 0.5 

A=100000/[341300(PE)(R)+(Q" - <lJ.}(llu)] 

876O=total number of hours per year 

4600=as defined in section 4.2.6 of this 

appendix 

For vented heaters equipped with two 

stage or step modulating controls the national 

average number of burner operating hours at 

the maximum operating mode (BOHH ) is 

defined as: 

BOHH=X2EM/Q" 

where: 

X2=as defined in section 4.1.15 of this 

appendix 

EM=as defined above 

Q,,=as defined in section 3.1 of this 

appendix at the maximum fuel input rate 

4.6.2 Average annual fuel energy for gas or oil fueled vented heaters. For vented 

heaters equipped with single stage controls 

or manual controls. the average annual fuel 

energy consumption (Ed is expressed in Btu 

per year and defined as: 

EFBOHss(Q" -<lJ.)+8760(<lJ.) 

where: 

BOHss=as defined in section 4.6.1 of this 

appendix 

Q,,=as defined in section 3.1 of this 

appendix 

Qp=as defined in section 3.5 of this 

appendix 

8760=as defined in section 4.6.1 of this 

appendix 

For vented heaters equipped with either 

two stage or step modulating controls E., is 

defined as: 

EFEM + 4600(<lJ.) 

where: 

EM=8S defined in section 4.6.1 of this 

appendix 

4600=a8 defined in section 4.2.6 of this 

appendix 

Qp=as defined in section 3.5 of this 

appendix~ 

4.6.3 Average annual auxiliary electrical 

energy consumption for vented heaters. 

For vented heaters with single stage 

controls or manual controls the average 

annual auxiliary electrical consumption (EAEl 

is expressed in kilowatt-hours defined as: 

EAE=BOHss(PE) 

where: 

BOHss=8s defined in section 4.6.1 of this 

appendix 

PE=8S defined in section 3.1.3 of this 

appendix 

For vented heaters equipped with two 

stage or modulating controls EAE is defined 

as: 

EAE=(BOHR + BOHH)(PEl 

where: 

BOHR=as defined in ~tion 4.6.1 of this 

appendix 

'BOHH=as defined in section 4.6.1 of this 

appendix 

PE=as defined in section 3.1.3 of this 

appendix 

4.6.4 Average annual energy 

consumption for vented heaters located in a different geographic region of the United 

States and in buildings with different design 

heating requirements. 

4.6.4.1 Average annual fuel energy 

consumption for gas or oil fueled vented 

home heaters located in a different 

geographic region of the United States and in 

buildings with different design heating 

requirements. 

For gas or oil fueled vented heaters the 

average annual fuel energy consumption for 

a specific geographic region and a specific 

typical design heating requirement (EFR) is 

expressed in Btu per year and defined as: 

EFR=[(EF - 8760 <lJ.) HLH I 1416) + 8760 <lJ. 

where: 

EFas defined in section 4.6.2 of this 

appendix 

8760=8s defined in section 4.6.1 oftbis 

appendix 

Qp=as defined in section 3.5 of this 

appendix 

HLH .. heating load hours for a specific 

geographic region determined from the 

heating load hour map in Figure 3-of this 

appendix 

1416=88 defined in section 4.6.1 of this 

appendix 

4.6.4.2 Average annual auxiliary 

electricoJ energy consumption for gas or oil 

fueled vented home heaters located in a 

different geJJgraphic region of the United 

States and in buildings with different design 

heating requirements. 

For gas or oil fueled vented home heaters 

the average annual auxiliary electrical energy 

consumption for a specific geographic region 

and a specific typical design heating 

requirement (EAERl is expressed in kilowatthours and defined as: 

EAER=EAE HLH 11416 

where: 

EAE=as defined in section 4.6.3 of this 

appendix 

HLH=as defined in section 4.6.4.1 of this 

appendix 

1416=a8 defined in section 4.6.1 ofthi8 

appendix 

F. Table 4 and Figure 3 are added in 

the appropriate location to the end of 

Appendix 0 of Subpart B of 10 CFR part 

430 to read as follows: 

TABLE 4.- AVERAGE DESIGN HEATING 

REQUIREMENTS FOR VENTED HEATERS WITH DIFFERENT OUTPUT CAPACITIES 

Vented heaters output capacity 

Qou.-(Btuhlr) 

5,000-7,499 ............................. . 

7.500-10.499 .......................... .. 

10,500-13.499 ......................... . 

13,500-16.499 ........................ .. 

16.500-19.499 ........................ .. 

19.500-22.499 ........................ .. 

22,500-26,499 ......................... . 

26.500-30.499 ......................... . 

30.500-34.499 ......................... . 

34.500-38.499 ......................... . 

38,500-42.499 ......................... . 

42.500-46.499 ......................... . 

46.500-51.499 ........................ .. 

51.500-56.499 ........................ .. 

56.~1.499 ........................ .. 

61.500-66.499 ......................... . 

66.500-71.499 ......................... . 

71.500-76.500 ........................ .. 

Average design heating 

requirements 

(Kbtuhlr) 

5.0 

7.5 

10.0. 

12.5 

15.0 

17.5 

20.5 

23.5 

26.5 

30.0 

33.5 

36.5 

40.0 

44.0 

48.0 

52.0 

56.0 

60.0 
EE-RM-93-501 COMMENT 00 

44570 Federal Jtegister / Vol. 58, No. 161 / Monday, August 23, 1993 / Proposed Rules 

3500 

ALASKA 

HAWAII AND TERRITORIES 

2500 

3500 HLH 

o HLH 

This map I~ nasonahly accurate for most parts or the United States bulls necessarily 

Ileneraliled. and conselluenlly nol tllO accurutt' In mountainous regions, particularly 

In the Rllckl~. 

F rr.URE 3- IInting IAllid lIuurs (111.11) fClr the United Stalt!! and Canada 

IILUNO 0001 .....o1-C 

1600 
EE-RM-93-501 COMMENT 00

Federal Register I Vol. 58, No. 161 I Monday, August 23, 1993 I Proposed Rules 44571 

6. Appendix P to Subpart B of Part 

430 is revised to read as follows: 

Appendix P to Subpart B of Part 430-

Unifonn Test Method for Measuring the 

Energy Consumption of Pool Heaters 

1. Test method. The test method for testing 

gas- and oil-fired pool heaters shall be as specified in ANSI Standard for Gas-Fired 

Pool Heaters, Z21.S6-1990. 

2. Test conditions. Establish the test 

conditions specified in section 2.8 of ANSI 

Standard Z21.S6-1990. 

3. Measurements. Measure the quantities 

delineated in section 2.8 of ANSI Standard 

Z21.56-1990, except in the case of oil-fired 

heaters the measurement of energy 

consumption in Btu's is to be carried out in 

appropriate units, e.g., gallons. 

4. Calculations. Calculate the thermal 

efficiency (expressed as a percent) as specified in section 2.8 of ANSI Standard 

Z21.56-1990, except in the case of oil-fired 

heaters the expression of fuel consumption 

shall be in Btu's. 

4.1 Annual Efficiency. An Annual 

Efficiepcy which incorporates fossil fuels and 

electrical energy, is defined as the ratio of the 

annual output of energy delivered to the pool 

water (fossil fuel) to the total annual energy 

input to the pool heater, and is, in percent: 

AE=E,.Eon/(Ep+F-E .. ) for pool heaters with 

pilot light ignition 

=E,/(1+(F-1).PEI(<l!N+PE)) for pool heaters 

without pilot light ignition 

where: 

E,=thermal effiCiency as defined in section 

2.8.1 of ANSI Standard Z21.S6-1990, 

percent 

.. steady-state efficiency as defined in 

section 2.8.2 of ANSI Standard Z21.S6-

1990, percent 

Eo.,=average annual energy consumption 

when burner is on, as defined in section 

4.2 of this appendix 

EFa8 defined in section 4.3 ofthis 

appendix 

Qp=energy consumption of continuously 

operating heater pilot light, if employed, 

Btuth 

E..=Average annual auxiliary electrical 

energy consumption for pool heaters a8 

defined in section 4.4 of this appendix, 

Btu 

F=the ratio of the energy consumed at the 

source of electrical generation to the 

electrical energy delivered at the pool 

heater, 

=3.37 

Olrr=rated fuel energy input as defined in 

section 2.8.1 or 2.8.2 of ANSI Standard 

Z21.56-1990, Btulh 

PE=2.Ec if heater tested according to 

section 2.8.1 of ANSI Standard Z21.56-

1!t90 

=3.413.PEr- if heater tested according 

to section 2.8.2 of ANSI Standard 

Z21.56-1990 

Ec=measured electrical energy 

consumption over a 3G-minute interval 

as defined in section 2.8.1 of ANSI 

Standard Z21.56-1990, BtuI(30 minutes) 

2=factor converting Btu per 30-minute to 

Btuth 

PEn.1ed=nameplate rating of auxiliary 

electrical equipment of heater, Watt 

3.413=factor converting Watt to Btulh 

4.2 Average annual energy consumption 

when burner is on. The average annual 

energy consumption when the burner is on 

(Eoo) is defined as: 

Eon=(BOH)(OlN+PE) 

where: 

BOH=average number of burner operating 

hours, = 104 

Olrr=rated fuel energy input as defined 

according to section 2.8.1 or 2.8.2 of 

ANSI Standard Z21.56-1990, Btulh 

PE=electrical input when burner is on, as 

defined in section 4.1 of this appendix 

4.3 Average annual fossil fuel energy for 

pool heaters. The average annual fuel energy 

for pool heater (EF) is defined as: 

EF(BOH)(OlN)+(POH-BOH)(Qp) 

where: 

BOH=average number of burner operating 

hours as defined in section 4.2 oUhis 

appendix 

POH=average number of pool operating 

hours, = 4464 

Qn.r-rated fuel energy input as defined 

according to section 2.8.1 or 2.8.2 of 

ANSI Standard Z21.56-1990 

Qp=energy consumption of continuously 

operating pilot light if employed. It is 

assumed that the pilot is turned off 

during non-pool season of the year, Btul 

h 

4.4 A verage annual auxiliary electrical 

energy consumption for pool heaters. The 

average annual auxiliary electrical energy 

consumption for pool heaters (E .. ) is 

exprassed in Btu and defined as: 

E..,=(BOH)(PE) 

where: 

BOH=as defined in section 4.2 of this 

appendix 

PE=as defined in section 4.1 of this 

appendix 

(FR Doc. 93-19268 Filed 8-2G-93; 8:45 am) 

BlLUNQ CODE M5O-01-f>