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1990 

STANDARD for 

!lPii 

... 1 • 

AIR-CONDITIONING 

& REFRIGERATION 

I NSTfTUTE 

\ \ ! • 'J 

KEH- R'f 

TCPC/E6-_ -

PACKAGED 

TERMINAL 

HEAT 

PUMPS 

Os. . ~OL~ .' .,.~ 

I Standard 380 I 

1501 WILSON BOULEVARD. ARLINGTON, VIRGINIA 22209 

.

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IMPORTANT 

SAFETY RECOMMENDATIONS 

It is strongly recommended that the product be designed, construCted, assembled and installed in accordance with 

nationally recognized safety requirements appropriate for products covered by this standard. 

ARI, as a manufacturers' trade association, uses its best efforts to develop standards employing state-of-the-art and 

accepted industry practices. However, ARI does not certify or guarantee safety of any products, components or 

systems designed, tested, rated, installed or operated in accordance with these standards or that any tests 

conducted under its guidelines will be non-haz~rdous or free from risk. 

ARI CERTIFICATION PROGRAM PROVISIONS 

Scope of the Certification Program 

The Certification Program includes all factory-made residential, commercial and industrial packaged terminal heat 

'pumps, in all sizes, as defined in section 3. 

Certified Ratings 

The following certification program ratings are verified by test: 

1. Cooling Capacity, Btuh, [Watts]. 

2. Energy Efficiency Ratio, EER, Btuhlw, [WattslWatts]. 

3. High Temperature Heating Capacity, Btuh, [Watts]. 

4. High Temperature Coefficient of Performance (COP 47F). 

5. Low Temperature Heating Capacity, Btuh. [Watts] 

6. Low Temperature Coefficient of Performance (COP 47F). 

Conformance to the requirements of the Maximum Operating Condition Test, Voltage Tolerance Test, LowTemperature Operation Test, Insulati9n Efficiency Test, Condensate Disposal Test, and Air Infiltration Test (see 

Section 6) are also verified by test. 

PnceSl5.00 

I'rrtftd III U.S.A 

Note 

This Standard supersedes ARI Standard 380-87 

~r.;; i!:I COPYRIGHT 1990. by Air'Conditioning and Refrigeration Institute 

• •• ,. Registered United States Patent and Trademarlc Off tee 

• 

•• 
C ./ 

TABLE OF CONTENTS 

PART PAGE 

Section 1. Purpose ...................................................................... ~ . . 1 

Section 2. Scope ........................................................................... 1 

Section 3. Definitions ...................................................................... 1 

Section 4. Standard Equipment .......................... . ........ . .......................... 2 

Section 5. Rating Requirements ...................... . ...................................... 2 

Section 6. Performance Requirements ......... ,. ............................................. 3 

Section 7 .. Voluntary Conformance 5 

Date Due 

.,j.~~ i : _r~ I 

M AY 24. 1993 

I 

j 

I 

I 

KEH-411 (1-841 
PACKAGED TERMINAL HEAT PUMPS 

Section 1. Purpose 

1.1 Purpose. The purpose of this standard is to establish. 

for packaged terminal heat pumps: definitions and classifications; standard equipment: requirements for testing and rating; specifications, literature and advertising 

requirements; performance requirements; design, construction and assembly requirements for safety; and conformance conditions. 

1.1.1 This standard is intended for the guidance of 

the industry, including manufacturers. architects 

and engineers. contractors and users. 

1.2 Review and Amendment. This standard is subject to 

review and amendment as the technology advances. 

Section 2. Scope 

2.1 Scope. This standard applies to factory-made residential. commercial and industrial packaged terminal 

heat pumps, in all sizes, as defined in 3.l. 

2.2 Exclusions. This standard does not apply to the 

rating and testing of individual assemblies, such as a 

cooling section or heating section, for separate use. 

2.2.1 This standard does not apply to room air 

conditioners [as defined in the ANSI Standard for 

Room Air Conditioners (Association of Home Appliance Manufacturers Standard ANSIIAHAM 

RAC-1-1982)], to room fan-coil air conditioners 

(as defined in ARI Standard 440 for Room FanCoil Air Conditioners), to water-source heat 

pumps (as defined in ANSI! ARI Standard 320 for 

Water-Source Heat Pumps), or to packaged terminal air-c<;lOditioners (as defined in ARI Standard 

310 for Packaged Terminal Air-Con~itioners). 

Section 3. Definitions 

3.1 Packaged Terminal Heat Pump. Package terminal 

heat pump means a separate unencased refrigeration 

system installed in a cabinet of similar function and configuration to that of a packaged terminal air-conditioner. 

It utilizes reverse cycle refrigeration as its prime heat 

source and should have other supplementary heat source 

available to builders with the choice of hot water, steam 

or electric resistance heat. 

3.1.1 Installation. The assembly is intended for 

free conditioned-air distribution but, as an application condition, may be employed with minimal 

ductwork having a total external static resistance 

up to 0.1 in. of water HG. [24.9Pa]. 

3.2 Published Rating. Published Rating i~ a statement 

of the assigned values of those performance characteristics, under stated rating conditions, by which a unit 

may be chosen to fit its application. These values apply 

to all units of like nominal size and type (identification) 

produced by the same manufacturer. 

3.2.1 Standard Rating. A rating based on tests 

performed at Standard Rating Conditions. 

3.2.2 Application Rating. A rating based on tests 

performed at application rating conditions (other 

than Standard Rating Conditions). 

3.3 Rating Conditions. Any set of operating conditions 

under which a single level of performance results, and 

which causes only that level of performance to occur. 

3.3.1 Standard Rating Conditions. Rating conditions used as the basis of comparison of performance characteristics. . 

3.4 Energy Efficiency Ratio (EER). A ratio calculated 

by dividing the cooling capacity in Btuh by the power 

input in watts at any given set of rating conditions, expressed in Btu per watt-hour (BtuIW). 

3.4.1 Standard Energy Efficiency Ratio. A ratio 

calculated from the capacity and power input . 

values obtained at Standard Rating Conditions. 

3.5 Coefficient of Performance (COP). A ratio calculated by dividing the total heating capacity provided by 

the refrigeration system including circulating fan heat 

but excluding supplementary resistance heat, Btuh by 

the total electrical input watts x 3.412. [A ratio calculated for both cooling and heating capacities by dividing 

capacity in watts by power input in watts.] 

3.S.1 Standard Coefficient of Performance. A 

ratio calculated from the capacity and power input 

values (obtained in accordance with 3.5) at Standard Rating Heating Conditions. 

3.6 "Shall" "Should" 'fRecommended" or "It is Recommended':. "Shall", ':should", "recommended" or "it 

is recommended" shall be interpreted as follows: 

3.6.1 Shall. Where "shall" or "shall not" is used 

for a provision specified, that provision is mandatory if compliance with the standard is claimed. 

3.6.2 Should, Recommended or It is Recommended. "Should", "recommended" or "it is recommended" is used to indicate provisions which 

1 
" 

., 

are not mandatory but which are desirable as good 

practice. 

Section 4. Standard Equipment 

4.1 Equipment. A packaged terminal heat pump may be 

intended for heating only, or both heating and cooling. 

Section 5. Rating Requirements 

5.1 Standard Ratings. Standard Ratings shall be established at the Standard Rating Conditions specified in 

5.1.1 through 5.1.3. All Standard Ratings shall be verified by tests conducted in accordance with the ANSI! 

ASHRAE Standard 37-1988 Methods of Testing for Rat-

. ing Unitary Air Conditioning and Heat Pump Equipment, (American National Standard Institute, American 

Society of Heating, Refrigerating and Air Conditioning 

Engineers, Inc.), except that no secondary check shall 

be used and no ductwork shall be attached to the condenser, or (cooling) with the ASH RAE Standard 

Method of Testing for Room Air Conditioners and Packaged Terminal Air Conditioners (American Society of 

Heating, Refrigerating and Air Conditioning Engineers, 

Inc. Standard 16-88), or (heat pump heating) with ASH-

. RAE Standard Method of Testing for Rating Room Air 

Conditioner and Packaged Terminal Air Conditioner 

Heating Capacity (American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc. Standard 

58-1986), and with the test method and procedures as 

described in this standard. 

2 

5.1.1 Values of Standard Ratings. Standard Ratings relating to capacities shall be net ratings, reflectirig the effects of circulating fan heat, but not 

including supplementary heat and shall be expressed only in terms of Btu per hour Btuh [watts] 

in multiples of 100 Btuh [30 watts]. Cooling and 

heat pump heating capacity shall be expressed in 

total (sensible plus latent) capacity. Air flow rates 

sh.all be expressed in multiples of 10 cubic feet per 

mmute cfm, [5Us]. Power input shall be expressed 

in multiples of 5 watts. 

5.1.1.1 Values of Standard Energy Efficiency 

Ratios or Coefficients of Performance. Standard 

ratio~ of energy efficiency for cooling, whenever 

pubhshed, shall be expressed in mUltiples of the 

nearest 0.1 Btu/Wh [cooling COP in multiples of 

0.1 J:. standard coefficients of performance for 

heatang. whenever published, shall be expressed 

in multiples of the nea(est 0.1. 

5.1.2 Standard Rating Conditions. The conditions 

of test for Standard katings shall include: 

5.1:2.1 Cooling (Not required for heating only 

uOIts) 

Air temperature entering indoor 

portion of air conditioner 

.................. 80F [26.7°C] dry 

bulb, 67F [19.4°C] 

wet bulb 

Air temperature entering outdoor 

portion of unit .... 95F [35.0°C] dry bulb 

(and 75F [23.9°C] wet 

bulb when condensate is 

rejected to the air 

stream) . . Static pressure difference between 

room air inlet and outlet of 

unit .............. 0 in. water HG. [0 Pal 

Fan speed ........ Unit to be tested at manufacturer's recommended 

fan speed setting 

Ventilation dampers ................ closed 

5.1.2.2 Heating 

a. High Temperature Heat Pump Heating· 

Air temperature enterin~ indoor 

portion of unit. . . . 70F [21.1°C] dry 

bulb, 60F [15.6°C] 

wet bulb, maximum 

AIr temperature entering outdoor portion of unit ... .47F [8.3°C] dry • 

bulb, 43F [6.1 0c] 

wet bulb 

b. Low Temperature Heat Pump Heating· 

(This standard,rating temperature only applies if 

the manufacturer's published rating includes 

low temperature heat pump specifications) 

Air temperature entering indoor 

portion of unit . ..... 70F [21.1°C] dry 

bulb, 60F [15.6°C] 

wet bulb, maxiJnllm 

Air temperature entering outdoor 

portion of unit ...... 17F [- 8.3°C] dry 

bulb, 15F [ - 9.4°C] 

wet bulb 

Static pressure difference between room air inlet and 

outlet of unit ..... 0 in. water HG. [0 Pal 

Fan speed .... ' .. Unit to be tested at manufacturer's recommended 

fan speed setting 

Ventilation dampers ... . .......... closed 

• If unit defrosts during the test. the indoor supply air temperature 

shall not drop below 6S F [lS.3°e] for more than one minute. Compliance with this requirement is not required if the control circuitry is • 

such as to provide for supplementary heat during defrost. 
5.1.2.3 Air Flow. 

Inlet air temperature ...... 70 F [21.1 °C] to 80 

F [26.7°C] dry 

bulb 

Heating or cooling means .. . .... Not operated 

Static pressure difference between 

room air inlet and outlet of unit 

................... 0 in. water HG. [0 Pal 

Fan speed .................... max. setting 

Ventilation dampers ................ closed 

5.1.2.4 Electrical Conditions. Recommended 

nameplate voltages for 60 Hertz systems are one 

or more of the utilization voltages shown in 

Table 1 of ARI Standard 110 for Air Conditioning and Refrigerating Equipment Nameplate Voltages . 

All Standard Rating tests shaH be performed at 

the nameplate rated voltage and frequency. 

5.1.3 Equipment. The filter and any air-mixers, 

air-inlets, griHes, deflecting vanes. and, any other 

regularly-furnished equipment shall be in place 

during all preceding tests. 

5.2 Standard Electrical Ratings. Standard electrical ratings of watts, power factor, Btu per watt-hour (BtuIW), 

and coefficient of performance (COP), whenever published, shaH be based on tests conducted in accordance 

with, and at Standard Rating Conditions, described in 

5.1.1 through 5.1.3, and shall be based on the total power 

input to the product, which includes the watts input to 

the compressor(s) and fanes), plus controls and accessories included as part of the model number. Electrical 

ratings in this paragraph shall be given at the voltage 

specified by the manufacturer. 

5.3 Part-Load Rating. Packaged terminal heat pumps 

which are capable of capacity control shall be rated at 

each step of capacity reduction provided by the heat 

pump. and allowed by the controls. 

The conditions of test for part-load ratings are the same 

as for the Standard Ratings (see 5.1) except for the following: 

5.3.1 Cooling. 

Air temperature eptering outdoor 

portion of unit ........... 82 F [27.8°C] dry bulb 

(and 65 F [IB.3°C] wet 

bulb when condensate 

is rejected to the air 

stream) 

5.3.2 Heating. 

Air temperature entering outdoor 

portion of unit ........... 62 F [16.7°C] dry bulb. 

56.5 F [13.6°C] wet 

bulb 

5.4 Application Ratings. Ratings at conditions olher 

than those specified in 5.1.2 and 5.1.3 may be published 

as application ratings. and shall be based on dala determined by the methods of testing prescribed in 5.1. 

5.5 Publication of Ratings. Whenever application ratings are published or printed. they shaH include. or be 

accompanied by. the Standard Rati~g. clearly designated as such, including a statement "Of the conditions at 

which the ratings apply. 

5.5.1 Size Designation. The size designation used 

in published specifications. literature. or advertising, controlled by the manufacturer. for heat 

pumps rated under this standard. are to be expressed only in Btuh [watts] at the Standard Rating Conditions specified in 5.1.2 and 5.1.3 and in , 

the terms described in 5.1.1 Horsepower. tons. or 

other units shall not be used as size designations. 

5.6 To comply with this standard. published capacities. 

air flows, EER and COP for any production unit shall 

have an aHowance for testing and manufacturing variations. The amount of this allowance for capacity shaH 

not be lower than minus 5 percent of the rated values. 

Section 6. Performance Requirements 

6.1 Performance Requirements. To comply with this 

standard, packaged terminal heat pumps shaH be designed and produced in accordance with the pr~visio~s 

of this section, in such a manner that any production umt 

wiH meet the requirements detailed herein. 

6.2 Maximum Operating Conditions Test. Packaged terminal heat pumps shaH be designed and produced to 

pass the foHowing maximum operating conditions. te~t 

with an indoor coil air quantity and an outdoor coil aIr 

quantity as obtained when maintaining a static pressure 

of 0 in. water HG. [0 Pal difference between the respective air inlets and outlets of the unit. The unit shall 

be tested at the fan speed control setting employed for 

the Standard Rating Test-Cooling. 

6.2.1 Temperature Conditions. 

6.2.1.1 Cooling (not required for heating-only 

units) 

Air temperature entering indoor 

portion of unit ...... 95 F [35.0°C] dry bulb. 

71 F [21.2°C] wet bulb 

Air temperature entering outdoor 

portion of unit ...... 115 F [46.1 DC] dry 

bulb (and 75 F 

[23.9DC] wet bul.b 

when condensate IS 

rejected to the condenser air stream) 

3 
4 

6.2.1.2 Heating 

Air temperature entering indoor 

portion of unit ...... SO F [26.7°C] dry bulb 

Air temperature entering outdoor 

portion of unit ...... 75 F [23.9°C] dry bulb, 

65 F [IS.3°C] wet bulb 

6.2.2 Vo/rages. 

6.2.2.1 Tests shall be run a~ 90 percent and 110 

percent of the unit's nameplate rated voltage at 

the unit service connection and at rated frequency. 

6.2.2.2 The power supplied to the heat pump 

shall be adjusted just piror to the shutdown period (See 6.2.3.2) so that the resulting voltage 

at the unit's service connection is 86' per cent of 

nameplate rated voltage when the· compressor 

is on locked rotor. (For those dual voltage units 

which specify a minimum voltage of 5 per cent 

below the lower rated voltage, this locked-rotor 

voltage setting shall be 91 per cent of the lower 

rated voltage.) For the purpose of this standard, 

the compressor nameplate locked-rotor amperes may be used to determine this voltage. 

The proper value of no-load voltage which will 

give the specified voltage at locked-rotor conditions should be determined prior to the test. 

6.2.2.3 Within one minute after the heat pump 

has resumed continuous operation (See 

6.2.4.3), the voltage shall be restored to the 

value specified in 6.2.2.1. 

6.2.2.4 Dual voltage units whose lower voltage 

is 208 volts, and 208 volt single voltage units 

which specify on their specification sheets a 

minimum voltage to be applied at the unit service connection for the Maximum Operating 

Conditions Test, shall be tested at this minimum 

voltage in accordance with 6.2.2.1, 6.2.2.2 and 

6.2.2.3. This provision applies only when the 

minimum voltage does not exceed 198Y. 

6.2.3 Procedure. 

6.2.3.1 The heat pump shall be operated for 

two hours at the temperature conditions and 

voltage(s) specified. 

6.2.3.2 All power to the heat pump shall be cut 

off for a period sufficient to cause the compressor to stop (not to exceed five seconds) and then 

restored. 

6.2.4 Requirements. 

6.2.4.1 During both entire tests, the heat pump 

shall operate without damage to any of its parts ~ 

6.2.4.2 The heat pump shall operate continuously without interruption for any reason for the 

two-hour period preceding the power interruption. 

6.2.4.3 The unit shall resume continuous operation within two hours of restoration of power 

and shall then operate continuously for one 

hour. Operation and resetting of safety devices 

prior to establishment of continuous operation is 

permitted. 

6.3 Low-Temperature Operation Test (Cooling). (Not 

required for heating-only units). Packaged terminal heat 

pumps shall be designed and produced to pass the following low-temperature operation test when operating 

with initial air quantities as determined in the Standard 

Rating Test-Cooling, with 0 in. water HG. [0 PaJ static 

difference between air inlets and outlets of the unit, and 

with·controls and dampers set to produce the maximum 

tendency to frost o'r ice the evaporator, provided such 

settings are not contrary to the manufacturer's instructions to the user. 

6.3.1 Temperature Conditions. 

Air temperature entering indoor 

portion of unit ....... 67 F [I9.4°C] dry bulb, 

57 F [I3.9°C] wei bulb 

Air temperature entering outdoor 

portion of unit ...... 67 F [I9.4°C] dry bulb. 

57 F [I3.9°C] wet bulb· 

6.3.2 Procedure. The test shall be continuous with 

the unit on the cooling cycle. for not less than 

twelve hours after establishment of the specified 

temperature conditions. The unit will be permitted 

to start and stop under control of an automatic 

limit device, if provided. 

6.3.3 Requirements. 

6.3.3.1 During the entire test, the heat pump 

shall operate without damage to the equipment. 

6.3.3.2 During the entire test. frost or ice shall 

not form on the cooling coil to the point where 

icing could progress to cause the air flow to be 

cut off. 

6.3.3.3 During the test, and during the defrosting period after the completion of the test, all ice 

or meltage must be caught and removed by the 

drain provisions. 

6.4 Insulation Efficiency Test (Cooling). (Not required 

for heating-only units). Heat pumps shall be designed 

and produced to pass the following insulation efficiency 

°The wet bulb temperature condition is not required when testing 

air-cooled condensers which do not evaporate condensate. 

• 

• 
test when operating with air quantities as determined 

with 0 in. water HG. [0 Pal static difference between air 

inlets and outlets of the unit, and with controls, fans, 

dampers, and grilles set to produce the maximum tendency to sweat, provided such settings are not contrary 

to the manufacturer's instructions to the user. 

6.4.1 Temperature Conditions. 

Air temperature entering 

and surrounding indoor 

portion of unit ....... 80 F [26.7°C] dry bulb, 

. 75 F [23.9°C] wet bulb 

Air temperature entering 

outdoor portion of 

unit ................ 80 F [26.7°C] dry bulb, 

75 F [23.9°C] wet bulb6.4.2 Procedure. After establishment of the 

specified temperature conditions, the unit shall be 

operated continuously for a period of four hours. 

6.4.3 Requirements. During the test, no condensed water shall drip, run, or blow off from the 

unit. 

6.S Condesate Disposal Test-- (Cooling). (Not required 

for heating-only units). Heat pumps shall be designed 

and produced to pass the following condensate disposal 

test when operating with air quantities as determined 

with 0 in. water HG. [0 Pal static difference between air 

inlets and outlets of unit, and with controls and dampers 

set to produce condensate at the maximum rate, provided such settings are not contrary to the manufacturer's instructions to the user. 

6.5.1 Temperature Conditions. 

Air temperature entering and 

surrounding indoor portion 

of unit ............... 80 F [26.7°C] dry bulb, 

75 F [23.9°C] wet bulb 

Air temperature entering 

outdoor portion of 

unit .............. 80 F [26.7°C] dry bulb, 

75 F [23.9°C] wet bulb6.5.2 Procedure. After establishment of the specified temperature conditions, the heat pump shall 

be started with its condensate collection pan filled 

to the overflow point and shall be operated continuously for four hours after the condensate level has 

reached equilibrium. 

*The wet bulb temperature condition is not required when testing aircooled condensers which do not evaporate condensate. 

* *This test may be run concurrently with the Insulation Efficiency Test· 

(See 6.4). 

6.5.3 Reqlliremems. During the four-hour test and 

after the unit is turned off. there shall be no dripping. running-off. or blowing-off of moisture from 

the unit. 

6.6 Air Infiltration Test. Packaged terminal heat pumps 

shall be designed and produced to prevent excessive 

infiltration of outdoor air through the equipment and 

through its weather seals. 

6.6.1 Conditions. 

Indoor and outdoor 

air temperatures ........ 70-80 F [21.1-26.7°C] dry bulb 

Indoor static 

pressure ...... 0.1 in water HG. [24.9 Pal , 

below outdoor static pressure 

Ventilation dampers .................. closed 

Cooling and heating means (including fans) 

................ .. ............ not operating 

6.6.2 Procedure. The equipment shall be installed 

in a facility suitable to determine the ai~ infiltration 

quantity. . 

6.3.3 Requirements. The measured air flow rate 

cfm [Us] leading into the indoor portion shall be 

considered to be the infiltration rate through the 

equipment and shall not exceed 2 cfm per foot [3.1 

Us per m] of perimeter of the wall sleeve where it 

normally projects through the wall. 

6.7 Tolerances. The conditions for the tests outlined in 

6.2. 6.3, 6.4. 6.5 and 6.6 are average values subject to 

tolerances of ± 1.0 F [0.555°C] for wet-bulb and drybulb temperatures. and ± 1.0 per cent of the reading for 

voltages. 

Section 7. Voluntary Conformance 

7.1 Conformance. While conformance with this standard is voluntary, conformance shall not be claimed or 

implied for products or equipment within its Purpose 

(Section 1.) and Scope (Section 2.) unless such claims 

meet all of the requirements of the standard. 

5 "