54FR50525

Federal Register / Vol. 54, No. 234 / Thursday, December 7, 1989 / Notices 5f15:5

DEPARTMENT OF ENERGY

Office of Conservation and

Renewable Energy

Energy Conservation Program for

Consumer Products; Application for

Interim Waiver and. Petition for Waiver

of Furnace Test Procedures From

Lennox industries (F-018)

AGENCY.- Conservation and Renewable

Energy Office, Department of'Energy.

SUMMARY. Today's notice publishes a

letter granting an Application for an

Interim Waiver from Lennox Industries'

(Lennox) requesting relief from the

existing Department of Energy (DOE)

test procedures for furnaces regarding

(a) blower time delay and (b) the

determination of the off-cycle draft

factor (Df) for Lenno)es G20 and G20R

series atmospheric furnaees.

Today's notice also publishes a

"Petition for Waiver" from Lennox. The

company's Petition for Waiver requests

DOE to grant relief from the DOE test

procedures relating to the blower time

delay specification and in the

determination of Df. Lennox seeks to

test using a blower delay time of 45

seconds instead of the specified 1.5

minute delay between burner on-time

and blower on-time and determining Df

by tracer gas test measurements instead

of the specified value of 1.0 for

atmospheric burners- DOE is soliciting

comments, data and information

respecting the Petition for Waiver.

DATES: DOE will accept comments, data

and information not later than January

8, 1990.

ADDRESSES:. Written comments and

statements shall be sent to: Department

of Energy, Office of Conservation and

Renewable Energy, Case No. F-018, Mail

Stop CE-132, Forrestal Building. 1000

Independence Avenue SW„

Washington , DC 20585.

CAS-RM-79-104 COMMENT 33
54FR50525

5052G Federal Register

FOR FURTHER f.HF0Rt1ATiOH,C0NTACT

Carl E. Adams, U.S. Department of

Energy, Office of Conservation and

Renewable Energy, Mail station CE132, Forrestal Building, 10100

Independence Avenue SW.,

w'Er'ashin ton, DC 20585, (202) 536-9127

Eugene Margolis, Esq., U.S. Department

of Energy, Office of General Counsel,

Mail Station GC-12, Forrestal

Building,11000 Independence Avenue

SW., Washington, DC 20585, (202)

530-9507.$

lw:a^ik^t'fT1Qt`iYd

The Energy Conservation Program for

Consumer Products (other than

automobiles) was established pursuant

in the Energy Policy and Conservation

Act (SPCA), Pub. L. 94-163, 89 Stat. 917,

as amended by the National Energy

Conservation Policy Act (NECPA), Pub.

L. 95-619, 92 Stat. 3266, the National

Appliance Energy Conservation Act of

1987 (N.AECA), Public Law 100-12, and

the National Appliance Energy

Conservation Amendments of 1988

(NA.ECA) Public Law 100-357, which

requires DOE to prescribe standardized

test procedures to measure the energy

consumption of certain consumer

products, including furnaces.

The intent of the test procedures is to

provide a comparable measure of energy

consumption that will assist consumers

in making purchasing decisions. These

test procedures appear at 10 CFR Part

430; Subpart B.

DOE has amended the prescribed test

procedures by adding 10 CFR 430.27 on

September 26, 1980, creating the waiver

process. 45 FR 64108. DOE further

amended the Department's appliance

test procedure waiver process to allow

the Assistant Secretary for Conservation

and Renewable Energy (Assistant

Secretary) to grant an interim waiver

from test procedure requirements to

manufacturers. 51 FR 42823, November

26, 1986.

The waiver process allows the

Assistant Secretary to waive

temporarily test procedures for a

particular basic model when a petitioner

shows that the basic model contains one

or more design characteristics which'

prevent testing according to the

prescribed test'procedures or when the

prescribed test procedures may evaluate,

the basic model in a manner so

unrepresentative of its true energy

consumption as to provide materially

inaccurate comparative data. Waivers

generally remain in effect until final test

procedure amendments become

effective, resolving the problem that is

the subject of a waiver.

The interim waiver provisions, added

by the 1986 amendment, allow the

Assistant Secretary to grant an interim

Vol. 54, No. 234 / Thursday, December 7, 1989 / Notices

waiver when it is determined €hat the

applicant will experience economic

hardship if the Application for Interim

Waiver is denied, if it appears likely

that the Petition for Waiver will be

an ed. and/or the Assistant Secretary

determined that it would be desirable

for public policy reasons to o ant

immediate relief pending a

determination on the Petition for

Waiver.

On August 1, 1989, Lennox filed an

Application for Interim Waiver

regarding (a) blower time delay and (b)

the determination of DI. The first part of

Lennox's application seeks an interim

waiver from the DOE test provisions

that require a 1.5 minute time delay

between the ignition of the burner and

starting of the circulating air blower.

Instead, Lennox requests the allowance

to test using a 45 second blower time

delay when testing its G20 and G20R

series atmospheric furnaces. Lennox

states that the 45 second delay is

indicative of how these furnaces

actually operate. Such a delay results in

an energy savings of approximately 0.7

percent. Since current DOE test

procedures do not address this variable

blower time delay, Lennox asks that the

interim waiver be granted.

Previous waivers for this type of

timed blower delay control have been

granted by the Department to the

Coleman Company, 50 FR 2710, January

18, 1985, the Magic Chef Company, 50 FR

41553, October 11, 1985, the Rheem

Manufacturing Company, 53 FR 48574,

December 1. 1988, and the Trane

Company, 54 FR 19226, May 4, 1989.

Thus, it appears likely that the Petition

for Waiver will be granted for blower

time delay.

The second part of Lennox's

application seeks an interim waiver

from the DOE test procedure that

requires the use of a 1.0 value for Df for

an atmospheric furnace. The application

states that the G20 and G20R series of

atmospheric furnaces will incorporate

an electromechanical burner box

damper system that greatly restricts the

flow through the heat exchanger when

the damper is closed during the offcycle. Lennox claims the restriction of

the damper is similar to the restriction of

flow caused by a power burner during

the off-cycle. Thus, it should be given a

similar Df value as allowed for power

burners.

Lennox states that the current test

method does not give credit for the

energy savings due to the reduced flow

and, as a result, provides materially

inaccurate comparative data. To be able

to take credit for the energy savings

resulting from the reduced flow, Lennox

requests a waiver from the furnace test

procedure to allow Df to be determined

by tracer gas test measurements and to

use the calculations set forth in the test

procedures for power burners. When

tested using the tracer gas method for

determination of Df, which is allowed in

the test procedure for power burners,

Lennox claims the G20 furnace indicates

an Annual Fuel Utilization Efficiency

(AFUE) which averages at least 4.0

percent higher than is indicated when

tested under the current method of test

for atmospheric furnaces using the

specified value of 1.0 for Df.

For the purpose of reducing off-cycle

losses, there should be no difference

between restricting the air flow through

the heat exchanger by stopping the

combustion air blower in a power

burner and restricting the air flow by

some sort of electromechanically

operated damper. It appears likely that

the Petition for Waiver will be granted

for the determination of Df.

Because Lennox's Petition for Waiver

requesting relief from the DOE test

procedures concerning blower time

delay and the determination of Df

appear likely to be granted, the

company's Application for Interim

Waiver on these subjects is granted.

Pursuant to paragraph (b) of 10 CFR

430.27, DOE is hereby publishing the

"Petition for Waivers" in its entirety.

The petition contains no confidential

information. DOE solicits comments,

data, and information respecting the

petition.

In addition, pursuant to paragraph (e)

of § 430.27 of the Code of Federal

Regulations, the following letter granting

the Application for Interim Waiver was

issued to Lennox Industries.

Issued in Washington, DC, November 30,

1989.

Michael Davis,

Assistant Secretary, Conservation and

Renewable Energy.

November 39,1989.

Mr. Hal H. Rhea,

Vice President Research and Development,

Lennox Industries, Inc., P.O. Box 677,

Carrollton, Texas 75008

Dear Mr. Rhea: This is in response to your

August 1, 1989, Application for Interim

Waiver and Petition for Waiver from the

Department of Energy (DOE) test procedures

for furnaces when testing the company's G20

and GZOR series gas-fueled forced-air

atmospheric furnaces regarding (a) blower

time delay, and (b) the determination of off

cycle draft factor (Df).

Previous waivers for timed blower delay

control have been granted to the Coleman

Company, 50 F.R. 2710, January 18, 1985,

Magic Chef Company, 50 F.R. 41553, October

11, 1985, Rheem Manufacturing Company, 53

F.R. 48574, December 1,1988, and the Trane

Company, 54 F.R. 19226, May 4 , 1989. It

CAS-RM-79-104 COMMENT 33
54FR50525

Federal Registe

appears likely that Lennox 's Petition for

Waiver will be granted.

For the purpose of reducing the off-cycle

losses calculated by using Df, there should be

no difference between restricting the air flow

through the heat exchanger by stopping the

combustion air blower in a power burxier and

restricting the air flow by some sort of

electro-mechanically operated damper. It

appears likely that Lennox's Petition for

Waiver concerning the determination of the

off-cycle draft factor, Df. will be granted..

Thus, Lennox's Application for an Interim.

Waiver concerning blower time delay and the

Ietermination of the value of Df is granted for

the reasons stated above.

Lennox shall be permitted to test its C20

and C20R series of atmospheric furnaces on

the basis of the test procedures specified in

10 CFR Part 430, with the modification set

forth below.

(i) Section 9.3.1 of ANSI/AS-4R.AE

Standard 103-1982 is deleted and replaced

with the following paragraph:

Gas- and Oil-Fueled Central Furnaces.

After equilibrium conditions are achieved

following the cool-down test and the required

measurements performed, turn on the furnace

and measure the flue gas temperature, using

the thermocouple grid described above, at 0.5

and 2.5 minutes after the main burner(s)

comes on. After the burner start-up, delay the

blower start-up by 1,5 minutes (t-), unless: (1)

Vol. 54, No. 234 Thursday, December 7, 1989 / Notices 50527

The furnace employs a single motor to drive

the power burner and the indoor air

circulation blower, in which case the burner

and blower shall be started together, (2) the

furnace is designed to operate using an

unvarying delay time that is other than 1.5

minutes, in which case the fan control shall

be permitted to start the blower, or (3) the

delay time results in the activation of a

temperature safety device which shuts off the

burner, in which case the fan control shall be

permitted to start the blower. In the latter

case, if the fan control is adjustable, set it to

start the blower at the highest temperature. If

the fan control is permitted to start the

blower, measure time delay, (t-), using a stop

watch. Record the measured temperatures.

During the heat-up test for oil-fueled

furnaces, maintain the draft in the flue pipe

with ±0.01 inch of water gauge of the

manufacturer's recommended on-period

draft.

(iij Sections 8,9.2 and 8.9.2.1 of ANSI/

ASHRAE Standard 103-1982 to be deleted

and replaced with the following:

8.9.2 Optional Methods for Determining

Draft Factors Dp, Df, and Ds for Systems

equipped with Power Burners or Draft

Inducers or Atmospheric Systems with an

Electro-Mechanical Device that Restricts the

Flow Through the Heat Exchanger in the OffCycle. Draft Factors Dp, Dt and Da are to be

determined as described in 9.4. The tracer gas

Units without a stack damper but with

draft hood or draft diverter

TABLE 5.--INDOOR DRAFT FACTORS, FACTORS DESCFIBIMG AIR FLOW RATE FOR GAS AND OIL-FIRED NOM-CONDENSING FURNACES

OR BOILERS UTILIZING INDOOR AIR FOR COMBUSTION AND DRAFT CONTROL

Tyne of burner

System No.

Atmospheric 1 ............................ ............. ...... ........... ........................

Draft hoed or draft darter

S/F

2.4

24

1.0

0.4

to

1.0

Ds

chosen for this task should have a density

which is less than or approximately equal to

the density of air. Use a gas that is of a

different chemical species or different

concentration from the flue gas to be

measured and unreactive with the

environment to be encountered.

8.9.2.1 On power burner or induced draft

systems not employing automatic stack

dampers or systems with a stack damper and

a draft diverter or draft hood or atmospheric

systems with an electro-mechanical device

that restricts the flow through the heat

exchanger in the off-cycle, determine Df (the

ratio of gas mass flow rate through the flue

during the off-cycle to the gas mass flow rate

through the flue during the on-cycle at

identical temperatures) during the cool-down

test described in 9.1

(iii) The title of Section 9.4 of ANSI/

ASI-IRAE Standard 103-1982 to be deleted

and replaced with the following title:

9.4 Optional Test Procedures for

Determining Draft Factors for Dp, Elf, and Ds

for Systems Equipped with Power Burners or

Induced Draft Fans or for Atmospheric

Systems with an Electro-Mechanical Device

that Restricts the Flow Through the Heat

Exchanger in the Off Cycle.

(iv) Tables 8 and 7 of ANSI/ASHRAE

Standard 103-1982 to be deleted and replaced

with the following tables:

S

1.0

0.85

. Barometric draft control

em No. PS/F I

of

1.0

0.4

Units With a Stack Damper and

Barometric draft control

Ds

System No. SfF Of Ds System PIn. ^ S%F Df

5 2.4 1.r0 Co....._...._ ...... ............:............ .................... ............................. 7 1.4 1.0

Lt)-

Fi 2.4 0.4 Do ...........................:...................._..........................:......._.. 1a 0.3

iow(rv^

CAS-RM-79-104 COMMENT 33
54FR50525

50528

where

0.4, if Do<1/(S/F)

'Ds=Df=0.4

S/F=1

`See 11.4 second paragraph for direct

exhaust units employing forced or induced

draft, or power burners that utilize indoor air

and have no draft control device.

*A power burner may incorporate a device

on its air inlet which opens when the

applicance is in operation and closes the air

inlet when the appliance is in the standby

condition.

+Atn atmospheric furnace with an electromechanical device that restricts the flow

through the heat exchanger in the off-cycle

may be tested as a system 2 with Df=1.0 or

as determined by the optional test procedure

described in section 9.4.

TABLE 7.-I1-IDOOR DRAFT FACTORS, OUTDOOR DRAFT FACTORS, FACTORS DESCRIBiNG AIR FLOW RATE FOR GAS OR

COIL-FIRED FURNACES/BOILERS INTENDED FOR INSTALLATION OUT -F-DOORS;

IN UNHEATED SPACES (SUCH AS AN

ATTIC OR CRAWL SPACE); OR INTENDED

FOR INDOOR iNSTALLt?TION BUT

EQUIPPED WITH A DIRECT VENT SYSTEM AND ALL CONDENSING FURNACES

09 BOILERS

Units without a stack or

Type of flue damper

Burner

System No. Df

Atmospher- 9 ..................... 1.00 .............

ic.

Power°.......... 10+..._.......... 0.40._.............

Units with a flue damper Type of

d ,aft S/F

System No.

11....._... Dl..... ............. None .............

Do .................. Barometric 1.4

Damper.

12........... 0.4XDo......... Draft 2.4

I

Diverter. 1_

'Also includes forced and induced draft equipment.

+An atmospheric furnace with an electromechanical device that restricts the flow through the heat

exchanger in the off-cycle may be tested as a

system -10 with Dt=1.0 or as determined by the

optional test : procedure described in section 9.4.

This interim waiver is based upon the

presumed validity of statements and all

allegations submitted by the company. This

interim waiver may be revoked or modified

at any time upon a determination that the

factual basis underlying the application is

incorrect.

The interim waiver shall remain in effect

until the Department of Energy issues a

determination on Lennox's Petition for

waiver.

Federal Register / Vol. 54, No. 234 / Thursday, December 7, 1989 / Notices

D9 =

0.4+(0.4) (Do))(Do-1/(S/9,

Do(1-1/(S/F))

if Do>1/(S/F)

Sincerely,

J. Michael Davis, P.E.

Assistant Secretary, Conservation and

Renewable Energy.

August 1, 1989.

Assistant Secretary, Conservation and

Renewable Energy, United States

Department of Energy

1000 Independence Avenue SW.,

Washington, DC 20585

Dear Sir: This is a petition for waiver

submitted pursuant to Title 10 CFR Part

430.27. Waiver is requested from the uniform

test method for measuring energy

consumption of furnaces. In the interest of

saving energy, Lennox Industries Inc. has

developed a series of atmosspheric G20:.and

G20R furnaces which will utilize a 45 second

fixed ti me delay blower relay. Waiver is

requested from the 1.5 minute time delay

requirement between the burner ignition and

indoor blower activation in the heat-up

portion of the test as outlined in Appendix N

to Subpart B of Part 430 (Section 9.3.1 of

A23SI/ASHRAE 103-82). We have found that

under the current method of test the flue gas

temperature as measured in the stack reaches

a value which is higher than will be seen in

actual operation resulting in inaccurate

comparative data. Our test data indicates

that an energy savings of approximately 0.7%

on the AFUE is achievable with this

reduction in blower delay. Previous waivers

for this type of timed blower delay control

have been granted to the Coleman Company

(50 FR 2710, January 18, 1985), Magic Chef

Company (50 FR 41533, October 11, 1985), and

Rheem Manufacturing Company (53 FR 48574,

December 1, 1988).

We are requesting that Lennox Industries

Inc. be permitted to test its G20 series and

G20R series of furnaces on the basis of the

test procedures specified in 10 CFR part 430

with the following modification:

Section 9.3.1 of ANSI/ASIRZAE Standard

103-82 to be deleted and replaced with the

following paragraph:

Gas--and Oil-Fueled Central Furnaces.

After equilibrium conditions are achieved

following the cool-down test and the required

measurements performed, turn on the furnace

and measure the flue gas temperature, using

the thermocouple grid described above, at 0.5

and 2.5 minutes after the main burner(s)

comes on. After the burner start-up, delay the

blower start-up by 1.5 minutes (t-), unless:

(1) The furnace employs a single motor to

drive the power burner and the indoor air

circulation blower, in which case the burner

and blower shall be started together, (2) the

furnace is designed to operate using an

unvarying delay time that is other than 1.5

minutes, in which case the fan control shall

be permitted to start the blower, or (3) the

delay time results in the activation of a

temperature safety device which shuts off the

burner, in which case the fan control shall be

permitted to start the blower. In the latter

case, if the fan control is adjustable, set it to

start the blower at the highest temperature. If

the fan control is permitted to start the

blower, measure time delay, (t-), using a

stop watch. Record the measured

temperatures. During the heat-up test for oilfueled furnaces, maintain the draft in the flue

pipe within -x-0.01 in. of water gauge of the

manufacturer's recommended on-_period

draft.

The G20 and G20R series of atmospheric

furnaces will also incorporate an electromechanical burner box damper system that

greatly restricts the flow through the heat

exchanger when the damper is closed during

the of'-cycle. This is similar to the restriction

of flow caused by a power burner during the

off-cycle. Because the damper Is electromechanically operated, opening and closing

times are of the same order as times required

to bring a combustion air blower up to speed/

prove air flow (10 sec) and for the blower

impeller to slow down after power is

removed (3 sec). The current test method

does not give Lennox credit for the energy

savings due to the reduced flow and as a

result provides materially inaccurate

comparative data. To be able to take credit

for the energy savings resulting from the

reduced flow, Lennox Industries Inc. requests

a waiver from the furnace test procedure as

described in Appendix N to Subpart B of Part

430 to allow the off-cycle draft factor Df to be

determined by tracer gas test measurements

and calculations similar to a method that can

be employed on power burners. Under the

current test procedure as specified in

Appendix N to Subpart B of Part 430 (Section

8.9.1 and Draft Factor Tables B and 7 of

ANSI/ASHRAE 103-82) the draft factor Df is

set to a default value of 1.00 for an

atmospheric furnace. When tested by tracer

gas measurement as is specified for power

burners in Section 9.4 of ANSI/ASI-IRAE 103-

82, the draft factor Df was found to be In the

range of .20 to .30 resulting in a greatly

reduced energy loss. Lennox requests that the

draft factor Df be calculated as for a power

burner as is specified in ANSI/ASHRAE 103-

1982. In this way, the actual flow during the

off cycle and the resultant energy loss would

'be determined by test measurement rather

than by the assumed draft factor specified in

the procedure.

When tested using the tracer gas method

for determination of draft factor Df as

described above, the G20 furnace indicates

an Annual Fuel Utilization Efficiency (AFUE)

which averages at least 4.0% higher than is

indicated when tested under the current

method of test for atmospheric furnaces using

the default value of 1.00 for Df. We feel that

the homeowner should be allowed to take

advantage of the energy savings which this

efficiency increase represents.

We are requesting that Lennox Industries

Inc. be permitted to test its G20 series and

G20R series of furnaces on the basis of the

test procedures specified in 10 CFR part 430

with the following modifications;

CAS-RM-79-104 COMMENT 33
54FR50525

Federal Register / Vol. 54, No. 234 / Thursday, December 7, 1989 / Notices

(1) Sections 8.9.2 and 8.9.2.1 of ANSI/

ASHRAE Standard 103-1982 to be deleted

and replaced with the following:

8.9.2 Optional Methods for Determining

Draft Factors Dp, Df, and Ds for systems

equipped with Power Burners or Draft

Inducers or Atmospheric Systems with an

Electro-Mechanical Device that Restricts the

Flow Through the Heat Exchanger in the OffCycle. The tracer gas chosen for this task

should have a density which is less than or

approximately equal to the density of air. Use

a gas that is of a different chemical species or

different concentration from the flue gas to be

measured and unreactive with the

environment to be encountered.

8.9.2.1 On power burner or induced draft

systems not employing automatic stack

dampers or systems with a stack damper and

a draft diverter or draft hood or atmospheric

systems with an electro-mechanical device

that restricts the flow through the heat

exchanger in the off-cycle determine Df (the

ratio of gas mass flow rate through the flue

during the on-cycle at identical temperatures)

during the cool-down test described in 9.2.

(2) The following section to be added to

ANSI/ASHRAE Standard 103-1982:

8.9.2.3 Optional Methods for determining

Draft Factors Dp, Df, and Us on atmospheric

systems with an electro-mechanical device

that restricts the flow through the heat

5 529

exchanger in the off-cycle. Draft factors to be

determined as is described in 9.4.

(3) The title of Section 9.4 of ANSI/

ASHRAE Standard 103-1982 to be deleted

and replaced with the following paragraph:

9.4 Optional Test Procedures for

Determining Draft Factors for Dp, DL and Ds

for Systems Equipped with Power Burners of

Induced Draft Faris or for Atmospheric

Systems with an Electro-Mechanical Device

that Restricts the Flow Through the Heat

Exchanger in the Off-Cycle.

4) Tables 5 and 7 of ANSI/ASHRAE

Standard 103-1982 to be deleted and replaced

with the following tables:

TABLE 6.-INDOOR DRAFT FACTORS, FACTORS DESCRIBING AIR FLOW RATE FOR GAS AND OIL-FIRED. NON-CONDENSING FURNACES

OR BOILERS UTILIZING INDOOR AIR FOR COMBUSTION AND DRAFT CONTROL

Type of burner

System No.

Atmospheric 1 ...............................................................................:.....

Power' 2'+ ........................................................................................

Units without a stack damper but with

draft hood or draft divorter

S/F I of I Ds

2.4

2.4

1.0

0.4

1.0

1.0

Units with a stack damper and

System No.

1.0

0.4

1.0

0.85

Draft hood or draft diverter Barometric draft control

System No. S/F Of Ds System No. S/F Of Ds

5

6

2.4

2.4

1.0

0.4

Do ....................................................................................................

Do ................................................................................................

7

8

1.4

1.4

1.0

0.4

Do

(Do)(Dp')

where

0.4, if Do ' 1/(S/F)

Dp'=0.4+(0.85-(0.4)(Do))(Do-1/(S/F)), if Do > i/(S/F)

Do91-1/(S/F))

'Ds=Df=-0.4

S/F=1

"See 11.4 second paragraph for direct

exhause units employing forced or induced

draft, or power burners that utilize indoor air

and have no draft control device.

"A power burner may incorporate a device

on its air inlet which opens when the

appliance is in operation and closes the air

inlet when the appliance is in the standby

condition.

+An atmospheric furnace with an electromechanical device that restricts the flow

through the heat exchanger in the off-cycle

may be tested as a system 2 with Df=1.0 or

as determined by optional test procedure.

TABLE 7.-OUTDOOR DRAFT FACTORS,

FACTORS DESCRIBING AIR FLOW RATE

FOR GAS OR OIL-FIRED FURNACES/

BOILERS INTENDED FOR INSTALLATION

OUT-OF-DOORS; IN UNHEATED SPACES

(SUCH AS AN ATTIC OR CRAWL SPACE);

OR INTENDED FOR INDOOR INSTALLATION BUT EQUIPPED WITH A DIRECT

VENT SYSTEM AND ALL CONDENSING

FURNACES OR BOILERS

Type of

burner

A.tmospher1c.

Power' ..........

Units with a it

System No.

11 _

Units without a stack or

flue damper

System No.

10+.__.........

of

1-00 ...............

0.40 ...............

ue damper

Do...... ............ Barometric

Type of

draft

of ................... None..............

S/F

1

1.4

TABLE 7.-OUTDOOR DRAFT FACTORS,

FACTORS -DESCRIBING AIR FLOW RATE

FOR GAS OR OIL-FIRED FURNACES!

BOILERS INTENDED FOR INSTALLATION

OUT-OF-DOORS; 04 UNHEATED SPACES

(SUCH AS AN ATTIC OR CRAWL SPACE);

OR INTENDED FOR INDOOR INSTALLATION BUT EQUIPPED WITH A DIRECT

VENT :SYSTEM AND ALL CONDENSING

FURNACES OR BOILERS-Col itnued

Units without a stack or

Type of flue damper

burner

System No. Df

12...........1 0.40 x Do ......1 cD;aft 2.4

Barometric draft control

S/F of Ds

3

4

I

Diverter.

'Also includes forced and induced draft equipmer t.

+An atmospheric furnace with an electromechanical device that restricts the flew through the heat

exchanger in the oft-cycle may be tested as a

system 10 with Df=1.0 or as determined by optional

test procedure.

Damper.

CAS-RM-79-104 COMMENT 33
50530

54FR50525

Federal Register / Vol. 54, No. 234 / Thursday, December 7, 1989 / Notices.

At the initial meeting of ASHRAE SPC 103-

1988 on June 28, 1989, it was recommended

that the 103 standard be revised to allow

tracer gas to be used on atmosphere furnaces

as an optional method for determining draft'

factors. There were no objections, and a subcommittee is being formed to review the

recommendation. We suggest. that the SPC

103-1988 committee accept our proposed

revisions and propose that DOE adopt the

revised standard as the basis for the DOE

test procedure.

Sincerely, Lennox Industries Inc.

Hal H. Rhea,

Vice President, Research and Development.

[FR Doc. 89-28612 Filed 12-6-89; 8:45 am]

BILLING CODE 6456-O1-M

CAS-RM-79-104 COMMENT 33