ARI - Standards for Ground Source Heat Pumps (Closed Loop)

4301 NORTH FAIRFAX DRIVE ! ARLINGTON, VIRGINIA 22203

Standard 330

1998

STANDARD for

GROUNDSOURCECLOSED-LOOP HEATPUMPS

Price $10.00 (M) $20.00 (NM) ©Copyright 1998, by Air-Conditioning and Refrigeration InstitutePrinted in U.S.A. Registered United States Patent and Trademark Office

IMPORTANT

SAFETY RECOMMENDATIONS

It is strongly recommended that the product be designed, constructed, assembled and installed in accordance withnationally 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-artand accepted industry practices. However, ARI does not certify or guarantee safety of any products, componentsor systems designed, tested, rated, installed or operated in accordance with these standards or that any testsconducted under its standards will be non-hazardous or free from risk.

ARI CERTIFICATION PROGRAM PROVISIONS

Scope of the Certification Program

The certification program includes ground source closed-loop heat pumps that are electrically driven,mechanical compression type systems as defined in the standard and included in this program.

Equipment Covered: This program applies only to ground source closed-loop heat pumps, ratedbelow 135,000 Btu/h [40 kW] at ARI Standard Rating Conditions (Cooling).

Exclusion: This certification program does not apply to the rating and testing of individualassemblies, such as condensing units or coils, for separate use.

Certified Ratings

The following certification program ratings are verified by test:

1. Cooling Capacity, Btu/h [W]2. EER, Btu/W•h [W/W]3. Heating Capacity, Btu/h [W]4. COP, W/W5. Fluid Flow, gpm [L/s]

Note:

This standard supersedes ARI Standard 330-93.

TABLE OF CONTENTS

SECTION PAGE

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

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

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

Section 4. Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Section 5. Testing and Rating Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Section 6. Performance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Section 7. Marking and Nameplate Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Section 8. Voluntary Conformance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

TABLES

Table 1. Classification of Ground Source Closed-Loop Heat Pumps . . . . . . . . . . . . . 2

Table 2. Minimum External Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

APPENDICES

Appendix A. References - Normative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Appendix B. References - Informative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ARI STANDARD 330-1998

1

GROUND SOURCE CLOSED-LOOP HEAT PUMPS

Section 1. Purpose

1.1 Purpose. The purpose of this standard is to establish Rating Heating Conditions.for ground source closed-loop heat pumps: definitions andclassification; requirements for testing and rating;performance requirements; marking and nameplate data;and conformance conditions.

1.1.1 This standard is intended for the guidance ofthe industry, including manufacturers, engineers,installers, contractors and users.

1.1.2 Review and Amendment. This standard issubject to review and amendment as technologyadvances.

Section 2. Scope

2.1 Scope. This standard applies to factory-made 100EF [-3.9EC to 37.7EC]. Rated efficiencies include anresidential, commercial and industrial ground source closed- allowance for power to circulate the fluid. A ground sourceloop heat pumps, as defined in Section 3. closed-loop heat pump consists of one or more factory-made

2.1.1 Energy Source. This standard applies only toelectrically-driven, mechanical compression typesystems.

2.1.2 Alternative Applications. Equipment designedfor rating under this standard may not be suitable foralternative applications covered in related ARIStandards 320 and 325.

2.2 Exclusions. This standard does not apply toindividual assemblies for separate use.

Section 3. Definitions

3.1 Definitions. All terms in this document will follow thestandard industry definitions in the current edition ofASHRAE Terminology of Heating, Ventilation, Air-Conditioning and Refrigeration unless otherwise definedthis section.

3.2 Coefficient of Performance (COP). A ratio of theheating capacity in watts [W], excluding supplementaryresistance heat, to the power input in watts [W] at any givenset of rating conditions expressed in watts/watt [W/W].(The international community uses the term EER asequivalent to cooling COP.)

3.2.1 Standard Coefficient of Performance. A ratioof the capacity to power input obtained at Standard

3.3 Energy Efficiency Ratio (EER). A ratio of the coolingcapacity in Btu/h [W] to the power input in watts [W] at anygiven set of rating conditions, expressed in Btu/W•h [W/W].

3.3.1 Standard Energy Efficiency Ratio. A ratio ofthe capacity to power input values obtained at StandardRating Conditions.

3.4 Ground Source Closed-Loop Heat Pump. A groundsource closed-loop heat pump typically uses fluid circulatedthrough a subsurface piping loop as a heat source/heat sink.The heat exchange loop may be placed in horizontaltrenches or vertical bores, or submerged in a body of surfacewater. The temperature of the fluid is related to climatic andoperating history conditions and usually varies from 25EF to

assemblies which normally include an indoor conditioningcoil with air moving means, compressor(s) and refrigerant-to-fluid heat exchanger(s), including means to provide bothcooling and heating, cooling only or heating only functions.When such equipment is provided in more than oneassembly, the separate assemblies shall be designed to beused together, and the requirements of rating outlined in thestandard are based upon the use of matched assemblies.

3.4.1 Functions. Ground source closed-loop heatpumps shall provide the function of air-circulating,cooling and heating with controlled temperature, andmay include the functions of water heating, air-cleaning, dehumidifying or humidifying.

Models designated as "cooling only" units need notinclude the heating function, and models designated as"heating only" units need not include the coolingfunction provided the following are met on thecorresponding model:

1. The components of the air-conditioningrefrigerant system (cooling system) aresubstantially the same on the heat pumpsystem.

2. Switches, thermostats and/or other controls ofelectrical components required for the reversecycle can be altered or deleted as required toprovide heating or cooling only.


2

3. All other chassis components, fans, motors,pumps, housings, etc., must be substantially thesame between both versions.

3.5 Published Rating. A statement of the assigned valuesof those performance characteristics, under stated ratingconditions, by which a unit may be chosen to fit itsapplication. These values apply to all units of like nominalsize and type (identification) produced by the samemanufacturer. As used herein, the term "published rating"includes the rating of all performance characteristics shownon the heat pump or published in specifications, advertisingor other literature controlled by the manufacturer, at statedrating conditions.

3.5.1 Standard Rating. A rating based on testsperformed at Standard Rating Conditions.

3.5.2 Application Rating. A rating based on testsperformed at application rating conditions (other thanStandard Rating Conditions).

3.6 Rating Conditions. Any set of operating conditionsunder which a single level of performance results, and whichcauses only that level of performance to occur.

3.6.1 Standard Rating Conditions. Rating conditions accordance with ASHRAE Standard 37, and with the testused as the basis of comparison of performance methods and procedures as described in this standard exceptcharacteristics. that the total cooling and heating capacity shall be the

3.7 "Shall," "Should," "Recommended" or "It IsRecommended." "Shall," "should," "recommended" or "it isrecommended" shall be interpreted as follows:

3.7.1 Shall. Where "shall" or "shall not" is used fora provision specified, that provision is mandatory ifcompliance with the standard is claimed.

3.7.2 Should, Recommended or It Is Recommended."Should," "recommended" or "it is recommended" isused to indicate provisions which are not mandatory butwhich are desirable as good practice.

Section 4. Classification

4.1 Classification. Normally, ground source closed-loopheat pumps within the scope of this standard may beclassified as shown in Table 1.

Section 5. Testing and Rating Requirements

5.1 Standard Rating. Standard ratings shall be establishedat the Standard Rating Conditions specified in 5.1.3. Allstandard ratings shall be verified by tests conducted in

average of the air-enthalpy method and the water coilmethod.

Table 1. Classification of Ground Source Closed-Loop Heat Pumps

Types of Ground Source Closed-Loop Heat Pumps

ARI Type+

Designation Cooling Arrangement Heating and Cooling Only Heating Only

*

Single Package HSP-GS HCSP-GS HOSP-GS FAN COMP EVAP COND

Split System HRCU-GS-CB HCRCU-GS-CB HORCU-GS-CB FAN COMP EVAP COND

Split System with No Indoor Fan HRCU-GS-C HCRCU-GS-C HORCU-GS-C COMP EVAP COND

A suffix of "O" following any of the above classifications indicates equipment not intended for use with field-+

installed duct systems (see 5.1.3.6).Denotes cooling mode function.*


3

Standard Ratings relating to cooling or heating capacitiesshall be net values, including the effects of circulating-fanheat, but not including supplementary heat. Standard InputRatings shall be the total power input to the compressor(s)and fan(s), plus controls and other items included as part ofthe model number(s).

Standard Ratings of units which do not have indoor air-circulating fans furnished as part of the model, i.e., splitsystem with indoor coil alone (see table 1), shall beestablished by subtracting from the total cooling capacity1250 Btu/h per 1000 scfm [775 watts per m /s], and by3

adding the same amount to the heating capacity. Totalpower input for both heating and cooling shall be increasedby 365 watts/1000 scfm [775 watts per m /s] of indoor air3

handled.

5.1.1 Values of Standard Capacity Ratings. These tests.)ratings shall be expressed only in terms of Btu/h [W] inmultiples of 100 Btu/h [10 W]. b. Heating (not required for cooling only

5.1.2 Values of Standard Energy Efficiency Ratio orCoefficients of Performance. Standard ratios of energyefficiency for cooling, whenever published, shall beexpressed in multiples of the nearest 0.1 Btu/W•h[cooling COP in multiples of 0.1]; standard coefficientsof performance for heating, whenever published, shallbe expressed in multiples of the nearest 0.1.

In calculating EER's or COP's, a penalty for water(fluid) pump effect of 0.8 watts per gpm per ft of H O2

[4.2 watts per L/s per kPa] (approximately 25% pumpefficiency total) shall be added to the measured powerinput. Furthermore, a pressure drop of 17 ft. of H O2

[51 kPa] shall be added for the loop to determine the 5.1.3.3 Electrical Conditions. Standard Ratingtotal pressure drop of the system for the pumping tests shall be performed at the nameplate ratedpenalty. voltage(s) and frequency.

5.1.3 Standard Rating Conditions. The testconditions for Standard Ratings shall include thefollowing:

5.1.3.1 Fluid. The fluid for all tests shall bebased on the use of a 15% solution by weight ofsodium chloride and water.

5.1.3.2 Standard Rating Conditions.

a. Cooling (not required for heating onlymodels).

Air temperature entering indoor portionof unit............80EF [26.7EC] dry bulb

67EF [19.4EC] wet bulbAir temperature surrounding

unit.................80EF [26.7EC] dry bulbFluid temperature entering

refrigerant-to-fluidheat exchanger..............77EF [25.0EC]

Fluid flow rate............... As specifiedby manufacturer

(Note: This flow rate shall be used for all

models).

Air temperature entering indoor portion ofunit.......70EF [21.1EC] dry bulb

60EF [15.6EC] wet bulb, max.Air temperature surrounding

unit.................70EF [21.1EC] dry bulbFluid temperature entering

refrigerant-to-fluidheat exchanger...................32EF [0EC]

Fluid flow rate................. As specified inStandard RatingCooling Test

For heat pumps with dual nameplate voltageratings, Standard Rating tests shall be performed atboth voltages, or at the lower of the two voltages, ifonly a single Standard Rating is to be published.

5.1.3.4 Indoor-Side Air Quantity. All StandardRatings shall be determined at an indoor-side airquantity, delivered against at least the minimumexternal resistance required by 5.1.3.6 as outlinedbelow. All air quantities shall be expressed as cfm[m /s] of Standard Air (density 0.075 lb per cu ft3

[1.2 kg/m ]).3


4

Table 2. Minimum External Resistance

Standard CoolingCapacity Ratings

MinimumExternal

Resistance

Btu/h x 1000 [kw]

In.of

H O2 [kPa]

Up thru 28.929 thru 42.943 thru 70.971 thru 105.9

106 thru 134.9135 thru 210.9211 thru 280.9281 thru 350.9351 thru 400.9401 thru 500.9501 and over

Up thru 8.48.5 thru 12.5

12.6 thru 20.720.8 thru 31.031.1 thru 39.539.6 thru 61.761.8 thru 82.282.3 thru 102.8

102.9 thru 117.4117.5 thru 146.7146.8 and over

0.100.150.200.250.300.350.400.450.550.650.75

0.0250.0370.0500.0620.0750.0870.1000.1120.1370.1620.187

a. Heat pumps shall be rated at the indoor-side air quantity delivered when operatingagainst the minimum external resistancespecified in 5.1.3.6 or at a lower indoor-side air quantity, if so specified by themanufacturer.

b. Heat pumps which do not incorporate anindoor fan, but are rated in combinationwith a device employing a fan shall berated as described under a. above. Forheat pumps of this class, the indoor-sideair quantity shall be as specified by themanufacturer in his standard ratings, orthe air quantity obtained through theindoor coil assembly when the pressuredrop across the indoor coil assembly andthe recommended enclosures andattachment means is not greater than 0.30in. of H O [0.075 kPa], whichever is less.2

Indoor-side air quantities as referred toherein apply to the air quantityexperienced when the unit is cooling anddehumidifying under the Standard HighTemperature Rating Cooling Conditionsspecified in this section. Heating-onlyunits shall use the air quantity experiencedwhen the unit is operating under theStandard High Temperature HeatingRating Conditions. This air quantity,except as noted in 6.3, shall be employedin all other tests prescribed herein withoutregard to resulting external static pressure,or if so specified by the manufacturer theair quantity employed in all of the testsshall be that achieved at the externalresistance employed in Standard RatingCooling test.

5.1.3.5 Requirements for Separated Assemblies.All Standard Ratings for heat pumps in which theoutdoor section is separated from the indoorsection, as in Type HRCU (shown in Section 4),shall be determined with at least 25 ft. [7.6 m] ofinterconnecting tubing on each line, of the sizerecommended by the manufacturer. Heat pumps inwhich the interconnecting tubing is furnished as anintegral part and a recommended length is notfurnished shall be tested with the complete lengthof tubing furnished, or with 25 ft. [7.6 m] oftubing, whichever is greater. The line sizes,insulation and details of installation shall be inaccordance with the manufacturer's publishedrecommendations.

5.1.3.6 Minimum External Resistances. Indoorair-moving equipment intended for use with fieldinstalled duct systems shall be designed to operateagainst, and tested at not less than, the minimumexternal resistance shown in table 2 whendelivering the rated capacity and air quantityspecified in 5.1.3.4. Indoor air-moving equipmentnot intended for use with field installed ductsystems shall be tested at 0 in. of H O [0 kPa]2

external pressure.

In interpreting this requirement, it is understoodthat the most restrictive filters, supplementaryheating coils and other equipment recommended asoptional parts of the heat pump be in place and thatthe net external resistances specified above areavailable for the external duct system.

5.2 Part-Load Rating. Heat pumps which are capable ofcapacity control shall be rated at each step of capacityreduction provided by the heat pump and allowed by thecontrols.

5.2.1 Part-Load Rating Conditions. The conditionsof test for part-load ratings are the same as for theStandard Ratings (see 5.1) except for the following:

5.2.1.1 Part-Load Rating Temperatures(Cooling).

Air temperature entering indoor portionof unit..........................80EF [26.7EC] dry bulb

67EF [19.4EC] wet bulbFluid temperature entering refrigerant-

to-fluid heat exchanger...............70EF [21.1EC]


5

5.2.1.2 Part-Load Rating Temperatures (Heatingnot required for cooling only models).

Air temperature entering indoor portion standard, ground source closed-loop heat pumps shall beof unit........................70EF [21.1EC] dry bulb designed and produced in accordance with the provisions of

60EF [15.6EC] wet bulb max. this section in such a manner that any production unit willAir temperature surrounding meet the requirements detailed herein.

unit...............................70EF [21.1EC] dry bulbFluid temperature entering refrigerant-

to-fluid heat exchanger...................41EF [5EC]

5.2.1.3 Capacity reduction means may be an indoor-side coil air quantity as determined under 5.1.3.4:adjusted to obtain the specified step of unloading.No manual adjustment of indoor air or water flowquantities from those of standard rating conditionsshall be made. Automatic adjustment of thequantities by system function, however, ispermissible. For water flow, a separate controlsignal output for each step of pump capacity will beconsidered automatic adjustment.

5.3 Application Ratings. Ratings other than thosespecified in 5.1.3 and 5.2.1 may be published as applicationratings, and shall be based on data determined by themethods prescribed in 5.1.

5.4 Publication of Ratings. Wherever application ratings heat exchanger..........100EF [37.8EC]are published or printed, they shall include, or be Fluid flow rate.............maintained sameaccompanied by, the Standard Capacity Ratings plus the as in 5.1.3.2Part-Load Rating (where applicable), and theircorresponding power inputs, clearly designated as such,including a statement of the conditions at which the ratingsapply.

5.4.1 Capacity Designation. The capacity indoor portiondesignation used in published specifications, literature of unit..........80EF [26.7EC] dry bulbor advertising, controlled by the manufacturer, for heat Air temperature surroundingpumps rated under this standard, are to be expressed unit...............80EF [26.7EC] dry bulbonly in Btu/h [W] at the Standard Rating Conditions Fluid temperature enteringspecified in 5.1.3 plus Part-Load Rating Conditions refrigerant-to-fluidspecified in 5.2.1 and in the terms described in 5.1.1 heat exchanger............75EF [23.9EC]through 5.1.2. Fluid flow rate.............maintained same

5.5 Tolerances. To comply with this standard, StandardRatings for any production unit shall have an allowance for 6.2.2 Voltages.testing and manufacturing variations. The amount of thisallowance of heating and cooling capacity, ratios of energyefficiency for cooling and coefficients of performance forheating should not be lower than minus 5 percent.

Section 6. Performance Requirements

6.1 Performance Requirements. To comply with this

6.2 Maximum Operating Conditions Test. Ground sourceclosed-loop heat pumps shall be designed and produced topass the following maximum operating conditions test with

6.2.1 Temperature Conditions.

6.2.1.1 Cooling (not required for heating onlymodels).

Air temperature surroundingunit...............95EF [35.0EC] dry bulb

Air temperature enteringindoor portionof unit..........95EF [35.0EC] dry bulb

71EF [21.7EC] wet bulbFluid temperature entering

refrigerant-to-fluid

6.2.1.2 Heating (not required for cooling onlymodels).

Air temperature entering

as in 5.1.3.2

6.2.2.1 Tests shall be run at 90 percent and110 percent of the unit's nameplate rated voltage atthe unit's service connection and at rated frequency,or at a lower than 90 percent minimum or a higherthan 110 percent maximum voltage if so listed onthe nameplate.


6

6.2.2.2 The power supplied to the heat pumpshall be adjusted just prior to the shut down period(see 6.2.3.2) so that the resulting voltage at theunit's service connection is 86 percent ofnameplate rated voltage when the compressor is 6.3.1 Temperature Conditions (Cooling). (noton locked rotor. (For those dual voltage units so required for heating only)specified on their specification sheets for aminimum voltage 5 percent below the lower rated Air temperature entering indoor portionvoltage, this locked-rotor voltage setting shall be of unit....................80EF [26.7EC] dry bulb91 percent of the lower rated voltage.) 67EF [19.4EC] wet bulb

6.2.2.3 Within one minute after the heat pumphas resumed continuous operation (see 6.2.4.3),the voltage shall be restored to the values specifiedin 6.2.2.1.

6.2.2.4 Single phase dual voltage units whoselower voltage is 208V, which specify on theirspecification sheets a minimum voltage to beapplied at the unit service connection for themaximum operating conditions test, shall betested at the lower of this minimum voltage or 6.3.2 Temperature Conditions (Heating). (not198V in accordance with 6.2.2.1, 6.2.2.2 and required for cooling only)6.2.2.3.

6.2.3 Procedure.

6.2.3.1 The heat pump shall be operated for twohours at the temperature conditions and voltage(s)specified.

6.2.3.2 All power to the heat pump shall be cutoff for a period sufficient to cause the compressorto stop (not to exceed five seconds) and thenrestored.

6.2.4 Requirements.

6.2.4.1 During both entire tests, the heat pumpshall operate without failure to any of its parts.

6.2.4.2 The heat pump shall operatecontinuously without interruption for any reasonfor the two-hour period preceding the powerinterruption.

6.2.4.3 The unit shall resume continuousoperation within two hours of restoration of powerand shall then operate continuously for one hour.Operation and resetting of safety devices prior toestablishment of continuous operation ispermitted.

6.3 Low-Temperature Start and Operate Test. Groundsource closed-loop heat pumps shall be designed and

produced to pass the following low-temperature start andoperating test when operating with air quantities asdetermined in 5.1.3.4.

Fluid temperature entering refrigerant-to-fluid heat exchanger.............32EF [0EC]

Fluid flow rate......................maintained sameas in 5.1.3.2

6.3.1.1 Procedure. The low temperatureoperating test shall be continuous for a period ofnot less than 30 min. after the specifiedtemperature conditions have been established. Alimit device shall not operate during these tests.

Air temperature entering indoor portionof unit....................60EF [15.6EC] dry bulb

Fluid temperature entering refrigerant-to-fluid heat exchanger..........25EF [-3.9EC]

Fluid flow rate...........maintained 90% of thatspecified in 5.1.3.2

6.3.2.1 Procedure. The unit shall soak for10 minutes with 25EF [-3.9EC] fluid circulatingthrough the coil. The unit shall start and run fora minimum of 30 min. without being interruptedby any type of safety control or limit control.

6.3.3 Requirements.

6.3.3.1 During the entire test, the heat pumpshall operate continuously without damage to theequipment.

6.3.3.2 For a dual voltage unit, unit shalloperate continuously at the lower voltage.

6.4 Insulation Efficiency Test (Cooling). Ground sourceclosed-loop heat pumps shall be designed and produced topass the following insulation efficiency test when operatingwith air quantities as determined in 5.1.3.4 with controls,fans, dampers and grilles set to produce the maximumtendency to sweat, provided such settings are not contraryto the manufacturer's instructions to the user.


7

6.4.1 Temperature Conditions.

Air temperature entering and 7.1 Nameplate Data. The nameplate shall display thesurrounding indoor manufacturer's name, model designation, and electricalportion of unit.......80EF [26.7EC] dry bulb characteristics.

75EF [23.9EC] wet bulbFluid temperature entering refrigerant- Recommended nameplate voltages for 60 Hertz systems

to-fluid heat exchanger........50EF [10.0EC] shall include one or more of the equipment nameplateFluid flow rate.......................maintained same voltage ratings shown in Table 1 of ARI Standard 110.

as in 5.1.3.2 Recommended nameplate voltages for 50 Hertz systems

6.4.2 Procedure. After establishment of thespecified temperature conditions, the unit shall beoperated continuously for a period of four hours.

6.4.3 Requirements. During the test, no condensedwater shall drop, run or blow off from the unit casing.

6.5 Tolerances. The conditions for the tests outlined in6.2, 6.3 and 6.4 are average values subject to tolerances of±1.0EF [±0.6EC] for air wet bulb and dry bulbtemperatures, ±0.5EF [±0.3EC] for fluid temperatures and±1.0 percent of the reading for voltages.

Section 7. Marking and Nameplate Data

shall include one or more of the utilization voltages shownin Table 1 of IEC Standard Publicaton 38.

Section 8. Voluntary Conformance

8.1 Conformance. While conformance with this standardis voluntary, conformance shall not be claimed or impliedfor products or equipment within its Purpose (Section 1) orScope (Section 2) unless such claims meet all of therequirements of the standard.


8

APPENDIX A. REFERENCES - NORMATIVE

A1 Listed here are all standards, handbooks and other A1.3 ASHRAE Terminology of Heating, Ventilation,publications essential to the formation and implementation Air-Conditioning and Refrigerating, American Societyof the standards. All references in this appendix are of Heating, Refrigerating and Air-Conditioningconsidered as part of the standard. Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA

A1.1 ARI Standard 110-97, Air-Conditioning andRefrigerating Equipment Nameplate Voltages, 1997, A1.4 IEC Standard Publication 38, IEC StandardAir-Conditioning and Refrigeration Institute, 4301 Voltages, 1983, International ElectrotechnicalNorth Fairfax Drive, Suite 425, Arlington, VA 22203, Commission, 3, rue de Varembe, P.O. Box 131, 1211U.S.A. Geneva 20, Switzerland.

A1.2 ASHRAE Standard 37-1988, Methods ofTesting Unitary Air-Conditioning and Heat PumpEquipment, 1988, American Society of Heating,Refrigerating and Air-Conditioning Engineers, Inc.,1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A.

30329, U.S.A.

APPENDIX B. REFERENCES - INFORMATIVE

B1. Listed here are standards, handbooks and other B1.2 ARI Standard 325-98, Ground Water-Sourcepublications which may provide useful information and Heat Pumps, 1998, Air-Conditioning and Refrigerationbackground but are not considered essential. References in Institute, 4301 North Fairfax Drive, Suite 425,this appendix are not considered part of the standard. Arlington, VA 22203, U.S.A.

B1.1 ARI Standard 320-98, Water-Source HeatPumps, 1998, Air-Conditioning and RefrigerationInstitute, 4301 North Fairfax Drive, Suite 425,Arlington, VA 22203, U.S.A.

Documents

ARI - Standards for Ground Source Heat Pumps (Closed Loop)