4301 NORTH FAIRFAX DRIVE ! ARLINGTON, VIRGINIA 22203

Standard 740

1998

STANDARD for

REFRIGERANTRECOVERY/RECYCLINGEQUIPMENT

Price $15.00 (M) $30.00 (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-art andaccepted industry practices. However, ARI does not certify or guarantee safety of any products, components orsystems designed, tested, rated, installed or operated in accordance with these standards or that any tests conductedunder its standards will be non-hazardous or free from risk.

ARI CERTIFICATION PROGRAM PROVISIONS

Scope of the Certification Program

The Certification Program includes recovery, recovery/recycle and recycle equipment including System DependentEquipment.

Certified Ratings

The following Certified Ratings are verified by tests at rating conditions specified in Section 4:

1. Liquid Recovery Rate (kg/min) 2. Vapor Recovery Rate (kg/min) 3. Final Recovery Vacuum Level (kPa) 4. Recycle Flow Rate (kg/min) 5. Moisture (PPM by wt.) 6. Acid (PPM by wt.) 7. Non-Condensables (% by vol.) 8. High Temperature Vapor Recovery Rate (kg/min) 9. Residual Trapped Refrigerant (kg)10. Quantity of Refrigerant Processed at Rated Conditions (kg)11. High Boiling Residue (% by vol.)

Note:

This standard supersedes ARI Standard 740-95.

TABLE OF CONTENTS

SECTION PAGE

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

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

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

Section 4. Test Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

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

Section 6. Minimum Data Requirements for Published Ratings. . . . . . . . . . . . . . . . . . .3

Section 7. Operating Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Section 8. Marking and Nameplate Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Section 9. Voluntary Conformance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

TABLES

Table 1. Standard Contaminated Refrigerant Samples. . . . . . . . . . . . . . . . . . . . . . . .5

Table 2. Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Table 3. Contaminants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Table 4. ARI Categories of Refrigerants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

FIGURES

Figure C1. Test Apparatus for Self-Contained Equipment. . . . . . . . . . . . . . . . . . . . . .11

Figure C2. System Dependent Equipment Test Apparatus. . . . . . . . . . . . . . . . . . . . . .12

TABLE OF CONTENTS (CONTINUED)

APPENDICES

SECTION PAGE

Appendix A. References - Normative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Appendix B. References - Informative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Appendix C. Methods of Testing for Rating RefrigerantRecovery/Recycling Equipment - Normative. . . . . . . . . . . . . . . . . . . . . . .10

C1. Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10C2. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10C3. Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10C4. Test Apparatus and Instrumentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10C5. Performance Test Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10C6. Sampling and Chemical Analysis Methods. . . . . . . . . . . . . . . . . . . . . . . . . .15C7. Performance Calculations for Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Appendix D.Particulate Used In Standard ContaminatedRefrigerant Sample - Normative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

ARI STANDARD 740-1998

1

REFRIGERANT RECOVERY/RECYCLING EQUIPMENT

Section 1. Purpose

1.1 Purpose. The purpose of this standard is to establishfor refrigerant recovery/recycling equipment: definitions;test requirements, rating requirements, minimum datarequirements for published ratings, operating requirements,marking and nameplate data; and conformance conditions.It establishes methods of testing for rating and evaluatingthe performance of refrigerant recovery/recycling equipmentfor contaminant or purity levels, capacity, speed, purge lossto minimize emission into the atmosphere of designatedrefrigerants and to assure that recycling equipment meets theminimum purity requirements for refrigerants established inthe Industry Recycling Guide (IRG-2).

1.1.1 Intent. This standard is intended for theguidance of the 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 equipment forrecovering and/or recycling single refrigerants, azeotropes,zeotropic blends, and their normal contaminants fromrefrigerant systems. This standard defines the testapparatus, test gas mixtures, sampling procedures andanalytical techniques that will be used to determine theperformance of refrigerant recovery and/or recyclingequipment (hereinafter, "equipment").

2.1.1 Equipment shall be as defined in 3.3.1 and3.3.2.

2.1.2 Refrigerants used to evaluate equipment shallbe pure halogenated hydrocarbons, azeotropes andblends containing halogenated hydrocarbons.

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, AirConditioning, and Refrigeration unless otherwise definedin this section.

3.2 Clearing Refrigerant. Procedures used to removetrapped refrigerant from air conditioning and refrigerationequipment before switching from one refrigerant to another.

3.3 Equipment Classification.

3.3.1 Self-Contained Equipment. A refrigerantrecovery or recycling system which is capable ofrefrigerant extraction without the assistance ofcomponents contained within an air-conditioning orrefrigeration system.

3.3.2 System Dependent Equipment. Refrigerantrecovery equipment which requires for its operation theassistance of components contained in an air-conditioning or refrigeration system.

3.4 High Temperature Vapor Recovery Rate. Forequipment having at least one designated refrigerant (see8.2) with a boiling point in the range of -50 to +10EC, therate will be measured for R-22, or the lowest boiling pointrefrigerant if R-22 is not a designated refrigerant.

3.5 Published Ratings. A statement of the assigned valuesof those performance characteristics, under stated ratingconditions, by which a unit may be chosen to fit itsapplication. Theses 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 unit or published in specifications, advertising orother 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 Push/Pull Method. The push/pull refrigerant recoverymethod is defined as the process of transferring liquidrefrigerant from a refrigeration system to a receiving vesselby lowering the pressure in the vessel and raising thepressure in the system, and by connecting a separate linebetween the system liquid port and the receiving vessel.

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

ARI STANDARD 740-1998

2

3.7.1 Standard Rating Conditions. Rating conditions 3.16 Trapped Refrigerant. The amount of refrigerantused as the basis of comparison of performance remaining in the equipment after recovery orcharacteristics. recovery/recycling operation before clearing.

3.8 Reclaim. To process used refrigerant to new product3.17 Vapor Recovery Rate. The average rate thatspecifications. Chemical analysis of the refrigerant shall berefrigerant is withdrawn from the mixing chamber betweenrequired to determine that appropriate specifications are two pressures as vapor recovery rate is changing dependingmet. The identification of contaminants and required on the pressure. (The initial condition is vapor only atchemical analysis shall be specified by reference to nationalsaturation pressure and temperature at either 24EC or at theor international standards for new product specifications.boiling point 100 kPa, whichever is higher. The final

3.9 Recover. To remove refrigerant in any condition froma system and store it in an external container.

3.10Recycle. To reduce contaminants in used refrigerantsby separating oil, removing non-condensables and reducingmoisture, acidity and particulate matter to the levelsprescribed in Industry Recycling Guide (IRG-2).

3.11Recycle Equipment. Equipment that recycles andwhose type of equipment is "Recovery/Recycle" or"Recycle."

3.12Recycle Flow Rate The amount of refrigerantprocessed divided by the time elapsed in the recycling mode.For equipment which uses a separate recycling sequence, therecycle rate does not include the recovery rate (or elapsedtime). For equipment which does not use a separaterecycling sequence, the recycle rate is a rate based solely onthe higher of the liquid or vapor recovery rate, by which thecontaminant levels were measured.

3.13Residual Trapped Refrigerant. Refrigerant remainingin equipment after clearing.

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

3.14.1Shall. Where "shall" or "shall not" is used fora provision specified, that provision is mandatory ifcompliance with the standard is claimed.

3.14.2Should, 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.

3.15 Standard Contaminated Refrigerant Sample. Amixture of new or reclaimed refrigerant and specifiedquantities of identified contaminants which constitute themixture to be processed by the equipment under test. Thesecontaminant levels are expected only from severe serviceconditions.

pressure condition is 10% of the initial pressure, but notlower than the equipment final recovery vacuum and nothigher than 100 kPa.).

Section 4. Test Requirements

4.1 Testing Requirements. All standard ratings shall beverified by tests conducted in accordance with the provisionsset forth in Appendix C to this standard.

4.1.1 Equipment. Equipment shall be tested using allcomponents as recommended by the manufacturer.

4.1.2 Electrical Conditions. Tests shall be made atthe electrical characteristics specified on the unitnameplate.

Section 5. Rating Requirements

5.1 Standard Rating Conditions. Published Ratings shallinclude all of the standard ratings as shown in Tables 2 and3, for each refrigerant designated by the manufacturer. Thestandard contaminated refrigerant sample shall have thecharacteristics specified in Table 1, except that recoveryequipment not rated for any specific contaminant shall betested with new or reclaimed refrigerant. Testing shall beconducted at an ambient temperature of 24EC 1EC excepthigh temperature vapor recovery shall be 40EC 1EC.

For purposes of characterized performance, refrigerants havebeen categorized as shown in Table 4. Representative testrefrigerant(s) have been selected within each category fortest and rating purposes as shown in Table 4. Designatedindividual refrigerants may be selected for testing andrating.

Representative test refrigerants other than those designatedin the third column of Table 4 may be selected for testpurposes to form multiple individual refrigerants within achosen category. If the representative test refrigerant isreplacing a normally designated representative testrefrigerant per Table 4, then the refrigerant with the highest

ARI STANDARD 740-1998

3

vapor pressure within the category is used as therepresentative test refrigerant.

5.2 Tolerances. Performance related parameters shall be connections and clearing within 15 minutes. Specialequal to or better than the published ratings. equipment, other than a vacuum pump or manifold gauge set

Section 6. Minimum Data Requirements for conditions at ambient temperature.Published Ratings

6.1 Minimum Data Requirements for Published Ratings. 24EC with additional limited evaluation at 40EC. NormalPublished Ratings shall include all of the Standard Ratingsoperating conditions range from 10EC to 40EC.as shown in Tables 2 and 3 for each refrigerant designatedby the manufacturer.

Section 7. Operating Requirements

7.1 Equipment Information. The equipment manufacturershall provide operating instructions, necessary maintenanceprocedures and source information for replacement parts andrepair.

7.2 Filter Replacement for Recycle Equipment. Theequipment shall indicate when any filter/drier(s) needsreplacement. This requirement can be met by use of a mois-ture transducer and indicator light, by use of a sightglass/moisture indicator or by some measurement of theamount of refrigerant processed such as a flow meter or hourmeter. Manufacturer must provide maximum quantityrecycled or filter change interval in their writteninstructions.

7.3 Purge of Non-Condensable. If non-condensables are Standard Publication 38.purged, the equipment shall either automatically purge non-condensables or provide an indicating means to guide thepurge process. Recycle equipment must provide purgemeans.

7.4 Purge Loss. The total refrigerant loss due to purgingnon-condensables, draining oil and clearing refrigerant (seeC7.5) shall be less than 3% (by weight) of total processedrefrigerant.

7.5 Permeation Rate. High pressure hose assemblies 16 b. Refrigerant(s) If rating for designatedmm nominal and smaller shall not exceed a permeation rate individual refrigerants.of 3.9 g/cm/yr (internal surface) at a temperature of 48.8EC.2

Hose assemblies which have been UL recognized as havingpassed ANSI/UL 1963 requirements shall be acceptedwithout testing. See C5.1.4.

7.6 Clearing Trapped Refrigerant. For equipment ratedfor more than one refrigerant, the manufacturer shallprovide a method and instructions which will accomplish

shall be furnished. The clearing procedure shall not relyupon the storage cylinder below saturated pressure

7.7 Temperature. The equipment shall be evaluated at

7.8 Purity Requirements. Recycle equipment must meetthe purity requirements prescribed in the IndustryRecycling Guide (IRG-2).

7.9 Exemptions. Equipment intended for recovery onlyshall be exempt from 7.2, 7.3 and 7.8.

Section 8. Marking and Nameplate Data

8.1 Marking and Nameplate Data. The nameplate shalldisplay the manufacturer's name, model designation, type ofequipment, designated refrigerant(s) and electricalcharacteristics where applicable.

Recommended nameplate voltages for 60 Hertz systems shallinclude one or more of the equipment nameplate voltagesshown in Table 1 of ARI Standard 110. Recommendednameplate voltages for 50 Hertz systems shall include one ormore of the utilization voltages shown in Table 1 of IEC

8.1.1 Type of Equipment.

a. Recovery, Recovery/Recycle, or Recycleb. Self-Contained or System Dependent

8.1.2 Designated Refrigerants.

a. Category(ies). If rating for all refrigerantswithin a category.

ARI STANDARD 740-1998

4

8.2 Data for Designated Refrigerants. For eachrefrigerant category designated, the manufacturer shallinclude all the following that are applicable per Table 2 for9.1 Conformance. While conformance with this standardall refrigerants per Section C5.1.2. is voluntary, conformance shall not be claimed or implied

a. Liquid Recovery Rate (kg/min) Scope (Section 2) unless such claims meet all of theb. Vapor Recovery Rate (kg/min) requirements of this standard.c. High Temperature Vapor Recovery Rate (kg/min)d. Final Recovery Vacuum (kPa)e. Recycle Flow Rate (kg/min)f. Residual Trapped Refrigerant (kg)g. Quantity of Refrigerant processed at rated

conditions (kg)h. Refrigerant Loss (kg)

Section 9. Voluntary Conformance

for products or equipment within its Purpose (Section 1) and

ARI STANDARD 740-1998

5

Table

1. S

tandard

Conta

min

ate

d R

efr

igera

nt

Sam

ple

s

Refr

igera

nt

Type

Conta

min

ants

R11

R12

R13

R22

R113

R114

R123

R134a

R500

R502

R503

R401A

R401B

R401C

R402A

R402B

Mois

ture

Conte

nt:

ppm

by

Weig

ht

of

Pure

Refr

igera

nt100

80

30

200

100

85

200

200

200

200

30

200

200

200

200

200

Part

icula

te C

onte

nt:

ppm

by

Weig

ht

of

Pure

Refr

igera

nt

180

80

N/A

80

80

80

80

80

80

80

N/A

80

80

80

80

80

Aci

d C

onte

nt:

ppm

by

Weig

ht

of

Pure

Refr

igera

nt

2500

100

N/A

500

400

200

500

100

100

100

N/A

200

200

200

200

200

Oil

(HB

R)

Conte

nt:

% b

yW

eig

ht

of

Pure

Refr

igera

nt

20

5N

/A5

20

20

20

55

5N

/A5

55

55

Vis

cosi

ty/T

ype

3300/

MO

150/

MO

N/A

300/

MO

300/

MO

300/

MO

300/

MO

150/

PO

E150/

MO

150/

MO

N/A

150/

AB

150/

AB

150/

AB

150/

AB

150/

AB

Non-C

ondensa

ble

Gase

s(A

ir C

onte

nt)

: %

by V

olu

meN

/A3

33

N/A

3N

/A3

33

33

33

33

Supers

crip

ts:

1Part

icula

te c

onte

nt

shall

consi

st o

f in

ert

mate

rials

and s

hall

com

ply

wit

h p

art

icula

te r

equir

em

ents

in A

ppendix

D.

2A

cid c

onsi

sts

of

60%

ole

ic a

cid a

nd 4

0%

hydro

chlo

ric

aci

d o

n a

tota

l num

ber

basi

s.3

PO

E =

Poly

oest

er,

AB

= A

lkylb

enze

ne, M

O =

Min

era

l O

il.

N/A

- N

ot

Applic

able

.

ARI STANDARD 740-1998

6

Table

1. S

tandard

Conta

min

ate

d R

efr

igera

nt

Sam

ple

s (C

onti

nued)

Refr

igera

nt

Type

Conta

min

ants

R404AR

406AR

407AR

407BR

407CR

407DR

408AR

409AR

410AR

411AR

411BR

412A

R23

R507

R508AR

508B

R509

Mois

ture

Conte

nt:

ppm

by

Weig

ht

of

Pure

Refr

igera

nt2

00

200

200

200

200

200

200

200

200

200

200

200

30

200

20

20

100

Part

icula

te C

onte

nt:

ppm

by

Weig

ht

of

Pure

Refr

igera

nt

180

80

80

80

80

80

80

80

80

80

80

80

N/A

80

N/A

N/A

80

Aci

d C

onte

nt:

ppm

by W

eig

ht

of

Pure

Refr

igera

nt

2500

200

500

500

500

500

200

200

500

200

200

200

N/A

100

N/A

N/A

100

Oil

(HB

R)

Conte

nt:

% b

yW

eig

ht

of

Pure

Refr

igera

nt

55

55

55

55

55

55

N/A

5N

/AN

/A5

Vis

cosi

ty/T

ype

3150/

PO

E150/

AB

150/

PO

E150/

PO

E150/

PO

E150/

PO

E150/

MO

150/

MO

150/

PO

E150/

MO

150/

MO

150/

AB

N/A

150/

PO

EN

/AN

/A150/

MO

Non-C

ondensa

ble

Gase

s(A

ir C

onte

nt)

: %

by V

olu

me

33

33

33

33

33

33

33

33

3

Supers

crip

ts:

1Part

icula

te c

onte

nt

shall

consi

st o

f in

ert

mate

rials

and s

hall

com

ply

wit

h p

art

icula

te r

equir

em

ents

in A

ppendix

D.

2A

cid c

onsi

sts

of

60%

ole

ic a

cid a

nd 4

0%

hydro

chlo

ric

aci

d o

n a

tota

l num

ber

basi

s.3

PO

E =

Poly

ole

ster,

AB

= A

lkylb

enze

ne, M

O =

Min

era

l O

il.

N/A

- N

ot

Applic

able

.

ARI STANDARD 740-1998

7

Table 2. Performance

Parameter Recovery Recycle Recycle Equipment

Type of Equipment

Recovery/ System Dependent

Liquid Refrigerant Recovery Rate (kg/min) X X N/A N/A1 1

Vapor Refrigerant Recovery Rate (kg/min) X X N/A N/A1 1

High Temp. Vapor Recovery Rate (kg/min) X X N/A N/A1 1

Final Recovery Vacuum (kPa) X X N/A X

Recycle Flow Rate (kg/min) N/A X X N/A

Refrigerant Loss (kg) X X X X3 3

Residual Trapped Refrigerant (kg) X X X X2 2 2 2

Refrigerant Processed At Rated Conditions (kg)N/A X X N/A

If not rated use N/A, "Not Applicable."X Mandatory rating or equipment requirements.

Superscripts:1 For a recovery or recovery/recycle unit, one must rate either liquid refrigerant recovery rate or vapor

refrigerant recovery rate or one can rate for both. If rating only the one, the other shall be indicated byN/A, "not applicable."

2 Mandatory rating for equipment tested for multiple refrigerants.3 Mandatory rating if multiple refrigerants, oil separation or non-condensable purge are rated.

Table 3. Contaminants

Contaminant

Type of Equipment

Recovery Recovery/Recycle RecycleSystem Dependent

Equipment

Moisture Content (PPM by weight) * X X N/A

Chloride Ions (pass/fail) * X X N/A

Acidity (PPM by weight) * X X N/A

High Boiling Residue (% by volume) * X X N/A

Particulates (pass/fail) * X X N/A

Non-Condensables (% by volume) * X X N/A

* For recovery equipment, these parameters are optional. If not rated, use N/A, "not applicable."X Mandatory rating.

ARI STANDARD 740-1998

8

Table 4. ARI Categories of Refrigerants

Category Refrigerant Representative Test Refrigerants (DesignatedNumber Number Category Refrigerants)

Low Pressure

I R-113 R-11 and R-123R-123R-11

Medium Pressure - Low Moisture

II R-114 R-114

Medium Pressure

III R-12 R-134aR-134aR-401CR-406AR-500

Medium High Pressure

IV R-401A R-22 and R-407CR-409AR-401BR-412AR-411AR-407DR-22R-411BR-502R-407CR-402BR-408AR-509

High Pressure

V R-407A R-410AR-404AR-402AR-507R-407BR-410A

Very High Pressure - High Moisture

VI R-13 R-508AR-23R-508AR-503R-508B

ARI STANDARD 740-1998

9

APPENDIX A. REFERENCES-NORMATIVE

A1 Listed here are all standards, handbooks, and other A1.5 Addendum 700-1 to Appendix C to ARIpublications essential to the formation and implementation Standard 700-95, Air-Conditioning and Refrigerationof the standard. All references in this appendix are Institute, 4301 North Fairfax Drive, Suite 425,considered as part of this standard. Arlington, Virginia, U.S.A.

A1.1 ANSI/UL Standard 1963, Refrigerant A1.6 ASHRAE Terminology of Heating,Recovery/Recycling Equipment, First Edition, 1991 Ventilation, Air Conditioning, & Refrigeration, SecondAmerican National Standards Institute/Underwriters Edition, 1991, American Society of Heating,Laboratories, Inc., 11 West 42nd Street, New York, Refrigerating, and Air-Conditioning Engineers, Inc.,New York 10036, U.S.A./333 Pfingsten Road, ASHRAE, 1791 Tullie Circle, N.E., Atlanta, Georgia,Northbrook, Illinois, 60062, U.S.A. 30329, U.S.A.

A1.2 ARI Standard 110-97, Air-Conditioning and A1.7 Industry Recycling Guide (IRG-2), DecemberRefrigerating Equipment Nameplate Voltages, Air- 1994, Handling and Reuse of Refrigerants in theConditioning and Refrigeration Institute, ARI, 4301 United States, developed by The Ad-Hoc CommitteeNorth Fairfax Drive, Suite 425, Arlington, VA 22203, for the Use of Recycled Refrigerants - comprised ofU.S.A. representatives of equipment manufacturers,

A1.3 ARI Standard 700-95, Specifications forFluorocarbon and Other Refrigerants, 1995, Air-Conditioning and Refrigeration Institute, 4301 North A1.8 IEC Standard Publication 38, IEC StandardFairfax Drive, Suite 425, Arlington, Virginia, U.S.A. Voltages, 1983, International Electrotechnical

A1.4 Appendix C to ARI Standard 700-95,Analytical Procedures for ARI Standard 700-95, 1995,Air-Conditioning and Refrigeration Institute, 4301North Fairfax Drive, Suite 425, Arlington, Virginia,U.S.A.

contractors, refrigerant manufacturers and the GeneralServices Administration of the U.S. Government.

Commission, 3, rue de Varembe, P.O. Box 131, 1211Geneva 20, Switzerland.

APPENDIX B. REFERENCES-INFORMATIVENone.

ARI STANDARD 740-1998

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APPENDIX C. METHODS OF TESTING FOR RATINGREFRIGERANT RECOVERY/RECYCLING

EQUIPMENT - NORMATIVEC1 Purpose. The purpose of this appendix is to specify C4.2.4 Alternative Vapor Feed. An alternativemethods of testing for rating refrigerant recovery/recycling method for vapor feed shall be to pass theequipment. Specified are: test apparatus and refrigerant through a boiler and then through aninstrumentation, performance test procedures, sampling automatic pressure regulating valve set at differentand chemical analysis methods, and performance saturation pressures, moving from saturatedcalculations for ratings. pressure at 24EC to final pressure of recovery.

C2 Scope. This appendix applies to refrigerant C4.2.5 Liquid Feed. Liquid refrigerant feedrecovery/recycling equipment as defined in Section 3 of this consisting of control valves, sampling port andStandard. piping.

C3 Definitions. Definitions for this appendix are identical C4.2.6 Instrumentation. Instrumentationwith those in Section 3 of this standard. capable of measuring weight, temperature,

C4 Test Apparatus and Instrumentation.

C4.1 General Recommendations. Therecommended test apparatus is described in thefollowing paragraphs. If alternate test apparatus areemployed, the user shall be able to demonstrate thatthey produce results equivalent to the specified refereeapparatus.

C4.2 Self-Contained Equipment Test Apparatus.The apparatus, shown in Figure C1, shall consist of:

C4.2.1 Mixing Chamber. A mixing chamberconsisting of a tank with a conical-shaped bottom,a bottom port and piping for delivering refrigerantto the equipment, various ports and valves foradding refrigerant to the chamber and stirringmeans for mixing.

C4.2.2 Filling Storage Cylinder. The storagecylinder to be filled by the refrigerant transferredshall be cleaned and at the pressure of therecovered refrigerant at the beginning of the test.It will not be filled over 80%, by volume.

C4.2.3 Vapor Feed. Vapor refrigerant feedconsisting of evaporator, control valves and pipingto create a 3.0EC superheat condition at anevaporating temperature of 21EC 2EC.

pressure and refrigerant loss, as required.

C4.2.7 Size. The size of the mixing chambershall be a minimum of 0.09 m. The bottom port3

and the refrigerant feed shall depend on the size ofthe equipment. Typically, the mixing valves andpiping shall be 9.5 mm. For large equipment tobe used on chillers, the minimum inside diameterof ports, valves and piping shall be the smaller ofthe manufacturer's recommendation or 37 mm.

C4.3 System Dependent Equipment Test Apparatus.This test apparatus is to be used for final recoveryvacuum rating of all system dependent equipment.

C4.3.1 Test Setup. The test apparatus shown inFigure C2 consists of a complete refrigerationsystem. The manufacturer shall identify therefrigerants to be tested. The test apparatus can bemodified to facilitate operation or testing of thesystem dependent equipment if the modificationsto the apparatus are specifically described withinthe manufacturer's literature. (see Figure C2.) A6.3 mm balance line shall be connected across thetest apparatus between the high and low pressuresides, with an isolation valve located at theconnection to the compressor high side. A 6.3 m-m access port with a valve core shall be located inthe balance line for the purpose of measuring finalrecovery vacuum at the conclusion of the test.

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Figure C1. Test Apparatus for Self-Contained Equipment

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Figure C2. System Dependent Equipment Test Apparatus

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C5 Performance Testing Procedures. C5.2 Equipment Preparation and Operation. The

C5.1 General Testing.

C5.1.1 Temperatures. Testing shall beconducted at an ambient temperature of 24EC1EC except high temperature vapor recoveryshall be at 40EC 1EC. The evaporator conditionsof C4.2.3 shall be maintained as long as liquidrefrigerant remains in the mixing chamber. C5.4 Recovery-Only Testing. Recovery equipment

C5.1.2 Refrigerants. The equipment shall betested for all representative test refrigerants indesignated refrigerant categories or designated C5.5 Test Batch. The test batch consisting ofindividual refrigerants. All tests in Section C5 refrigerant sample (see Section C5.3) of the testshall be completed for each refrigerant before refrigerant shall be prepared and thoroughly mixed.proceeding with the next refrigerant. Continued mixing or stirring shall be required during

C5.1.2.1 Refrigerant Categories. Forpurposes of characterized performance,refrigerants have been categorized as shownin Table 4. C5.5.1 Control Test Batch. Prior to starting

C5.1.2.1.1 Representative testrefrigerant(s) have been selected withineach category for test and ratingpurposes as shown in Table 4.

C5.1.2.2 Designated individualrefrigerants may be selected for testing andrating.

C5.1.2.2.1 Representative testrefrigerants other than those designatedin the third column of Table 4 may beselected for test purposes to formmultiple individual refrigerants within achosen category. If the representativetest refrigerant is replacing a normallydesignated representative test refrigerantper Table 4, then the refrigerant with thehighest vapor pressure (at 40EC) withinthe category is used as the representativetest refrigerant.

C5.1.3 Selected Refrigerants . An individualrefrigerant may be selected for rating by amanufacturer; he may not imply compliance withthe category requirements.

C5.1.4 Hose Assemblies. For the purpose oflimiting refrigerant emissions to the atmosphere,hose assemblies shall be tested for permeationaccording to ANSI/UL Standard 1963, Section40.10.

equipment shall be prepared and operated per theoperating instructions.

C5.3 Contaminated Refrigerants. The standardcontaminated refrigerant sample shall have thecharacteristics specified in Table 1, except as providedin C5.4

not rated for any specific contaminant shall be testedwith new or reclaimed refrigerant.

the test while liquid refrigerant remains in the mixingchamber. The mixing chamber shall be filled to 80%level by volume.

the test for the first batch for each refrigerant, aliquid sample will be drawn from the mixingchamber and analyzed per Section C6 to assurethat contaminant levels match Table 1 within 10ppm for moisture, 20 ppm for oleic acid and0.5% for oil.

C5.6 Recovery Tests (Recovery andRecovery/Recycle Equipment).

C5.6.1 Determining Recovery Rates. Theliquid and vapor refrigerant recovery rates shall bemeasured during the first test batch for eachrefrigerant (see C7.1, C7.2 and C7.4). Equipmentpreparation and recovery cylinder changeovershall not be included in elapsed timemeasurements for determining vapor recovery rateand liquid refrigerant recovery rate. Operationssuch as subcooling the recovery cylinder shall beincluded. Recovery cylinder shall be the samesize as normally furnished by the equipmentmanufacturer. Oversized tanks shall not bepermitted.

C5.6.1.1 Liquid Refrigerant RecoveryRate. If elected, the recovery rate using theliquid refrigerant feed means (see C4.2.5)shall be determined. After the equipmentreaches stabilized conditions of condensingtemperature and/or recovery cylinderpressure, the recovery process shall bestopped and an initial weight shall be taken ofthe mixing chamber (see C7.2). The recovery

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process shall be continued for a period of timesufficient to achieve the accuracy in C7.4.The recovery process shall be stopped and afinal weight shall be taken of the mixingchamber.

C5.6.1.2 Vapor Refrigerant Recovery in C.5.7.2.Rate. If elected, the average vapor flow rateshall be measured to accuracy requirementsin clause C7.4 under conditions with noliquid refrigerant in the mixing chamber.The liquid recovery feed means shall be used.At initial conditions of saturated vapor at thehigher of 24EC or the boiling temperature(100 kPa), the weight of the mixing chamberand the pressure shall be recorded. At finalconditions representing pressure in themixing chamber of 10% of the initialcondition, but not less than the final recoveryvacuum (see C7.6) nor more than 100 kPa,measure the weight of the mixing chamberand the elapsed time. At initial conditions,the recovery cylinder shall be at saturationpressure at ambient conditions.

C5.6.1.3 High Temperature VaporRecovery Rate. Applicable for equipmenthaving at least one designated refrigerant (see8.2) with a boiling point between -50EC and+10EC. Measure the rate for R-22, or therefrigerant with the lowest boiling point if R-22 is not a designated refrigerant. Repeat thetest in C5.6.1.2 at saturated conditions at40EC and continue to operate equipment toassure it will achieve the final recoveryvacuum (see C5.6.3). At initial conditionsthe recovery cylinder shall be at saturatedpressure at 40EC.

C5.6.2 Recovery Operation. This test is fordetermining the final recovery vacuum and theability to remove contaminants as appropriate. Ifequipment is rated for liquid recovery (seeC5.6.1.3), liquid recovery feed means described inC4.2.5 shall be used. If not, vapor recovery meansdescribed in C4.2.3 or C4.2.4 shall be used.Continue recovery operation until all liquid isremoved from the test apparatus and vapor isremoved to the point where equipment shutsdown by automatic means or is manually shut offper operating instructions.

C5.6.2.1 Oil Draining. Capture oil fromthe equipment at intervals as required in theinstructions. Record the weight of thecontainer. Completely remove refrigerantfrom oil by evacuation or other appropriatemeans. The weight difference shall be used

C5.6.3 Final Recovery Vacuum. At the end ofthe first test batch for each refrigerant, the liquidvalve and vapor valve of the apparatus shall beclosed. After waiting 1 minute, the mixingchamber pressure shall be recorded (see C7.6).

C5.6.4 Residual Refrigerant. This test willmeasure the mass of remaining refrigerant in theequipment after clearing and therefore thepotential for mixing refrigerants (see 7.6).

C5.6.4.1 Initial Conditions. At the end ofthe last test for each batch for eachrefrigerant, the equipment shall bedisconnected from the test apparatus (FigureC1). Recycle per C5.7, if appropriate.Perform refrigerant clearing operations ascalled for in the instruction manual. Captureand record the weight of any refrigerantwhich would have been emitted to theatmosphere during the clearing process foruse in C7.5. If two loops are used forrecycling, trapped refrigerant shall bemeasured for both.

C5.6.4.2 Residual Trapped Refrigerant.Evacuate an empty test cylinder to 1.0 kPaRecord the empty weight of the test cylinder.Open all valves to the equipment so as toprovide access to all trapped refrigerant.Connect the equipment to the test cylinderand operate valves to recover the residualrefrigerant. Record the weight of the testcylinder using a recovery cylinder pressure noless than specified in C4.2.2. Place the testcylinder in liquid nitrogen for a period of30 minutes or until a vacuum of 1000microns is reached, whichever occurs first.

C5.7 Recycling Tests (Recovery/RecycleEquipment).

C5.7.1 Recycling Operation. As each recoverycylinder is filled in C5.6.2, recycle according tooperating instructions. There will not necessarilybe a separate recycling sequence. Note non-condensable purge measurement in C7.5.

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C5.7.1.1 Recycle Flow Rate. While C6.1.2 Chloride Ions. Chloride ions shall berecycling the first recovery cylinder for each measured by turbidity tests. At this time,refrigerant, determine the recycling flow rate quantitative results have not been defined. Reportby appropriate means (see C7.3) to achieve chloride content as "pass" or "fail." In the future,the accuracy required in C7.4. when quantitative results are possible, report

C5.7.2 Non-Condensable Sample. Aftercompleting C5.6.3, prepare a second test batch C6.1.3 Acidity. The acidity test uses the(C5.5). Recover per C5.6.2 until the current titration principle. Report the acidity in parts perrecovery cylinder is filled to 80% level by volume. million by weight (mg KOH/kg) of sample.Recycle per C5.7.1. Mark this cylinder and setaside for taking the vapor sample. For equipmenthaving both an internal tank of at least 3 kgrefrigerant capacity and an external recoverycylinder, two recovery cylinders shall be markedand set aside. The first is the cylinder describedabove. The second cylinder is the final recoverycylinder after filling it to 80% level by volume andrecycling.

C5.7.3 Liquid Sample for Analysis. Repeatsteps C5.5, C5.6.2 and C5.7.1 with further testbatches until indication means in 7.2 show thefilter/drier(s) need replacing.

C5.7.3.1 Multiple Pass. For equipmentwith a separate recycling circuit (multiplepass), set aside the current cylinder and drawthe liquid sample (see C5.6) from theprevious cylinder.

C5.7.3.2 Single Pass. For equipment withthe single pass recycling circuit, draw theliquid sample (see C5.6) from the currentcylinder.

C5.8 Measuring Refrigerant Loss. Refrigerant lossdue to non-condensables shall be determined byappropriate means (see C7.5.1). The loss could occurin C5.6.1, C5.6.2 and C5.7.1.

C6 Sampling and Chemical Analysis Methods.

C.6.1Chemical Analysis. Chemical analysis methodsshall be specified in appropriate standards such asARI Standard 700, Appendix-C to ARI Standard 700and Addendum 700-1 to Appendix C. If alternate testmethods are employed, the laboratory must be able todemonstrate that they produce results equivalent to thespecified referee method.

C6.1.1 Water Content. The water content inrefrigerant shall be measured by Karl FischerCoulometric Titration Techniques. Report themoisture level in parts per million by weight.

chloride content as parts per million by weight.

C6.1.4 High Boiling Residue. High boilingresidues shall use measurement of the volume ofresidue after evaporating a standard volume ofrefrigerant. Using weight measurement andconverting to volumetric units is acceptable.Report high boiling residues as percent by volume.

C6.1.5 Particulates/Solids. Theparticulates/solids measurement employs visualexamination. Report results as "pass" or "fail."

C6.1.6 Non-condensables. The level ofcontamination by non-condensable gases in thebase refrigerant being recycled shall bedetermined by gas chromatography. Reportresults as percent by volume.

C7 Performance Calculations for Ratings.

C7.1 Vapor Refrigerant Recovery Rate. This rateshall be measured by weight change of the mixingchamber divided by elapsed time (see C5.6.1.2). Theunits shall be kg/min and the accuracy shall be perC7.4.

C7.1.1 High Temperature Vapor RecoveryRate. This rate shall be measured by weightchange of the mixing chamber divided by elapsedtime (see C5.6.1.3). The units shall be kg/minand the accuracy shall be per C7.4.

C7.2 Liquid Refrigerant Recovery Rate. This rateshall be measured by weight change of the mixingchamber divided by elapsed time (see C5.6.1.3). Theunits shall be kg/min and the accuracy shall be perC7.4.

C7.3 Recycle Flow Rate. The recycle flow rate shallbe as defined in 3.11, expressed in kg/min, and theaccuracy shall be per C7.4.

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C7.3.1 For equipment using multi-passrecycling or a separate sequence, the recycle rateshall be determined by dividing the net weight, Wof the refrigerant to be recycled by the actual timeT required to recycle. Any set-up or operatorinterruptions shall not be included in the time, T.

C7.3.2 If no separate recycling sequence isused, the recycle rate shall be the higher of thevapor refrigerant recovery rate or the liquidrefrigerant recovery rate. The recycle rate shallmatch a process which leads to contaminant levelsin C7.9. Specifically, a recovery rate determinedfrom bypassing a contaminant removal devicecannot be used as a recycle rate when the C7.5.3 Clearing Unit. Refrigerant capturedcontaminant levels in C7.9 are determined by during the clearing process shall be measured inpassing the refrigerant through the contaminant accordance with C5.6.4.1removal device.

C7.4 Accuracy of Flow Rates. The accuracy of test vacuum shall be the mixing chamber pressure inmeasurements in C7.1, C7.2 and C7.3 shall be 0.008 C5.6.3, expressed in kPa. The accuracy of thekg/min for flow rates up to 0.42 kg/min and 2.0% for measurement shall be within 0.33 kPa.flow rates larger than 0.42 kg/min. Ratings shall beexpressed to the nearest 0.02 kg/min.

C7.5 Refrigerant Loss. This calculation will be minus the initial weight of the test cylinder inbased upon the net loss of refrigerant which would C5.6.4.2, expressed in kg. The accuracy shall be 0.02have been eliminated in the non-condensable purge kg and reported to the nearest 0.05 kg.process (see C5.7.1), the oil draining process (seeC5.6.2.1) and the refrigerant clearing process (seeC5.6.4.1), all divided by the net refrigerant content ofthe test batches. The refrigerant loss shall not exceed3% by weight.

C7.5.1 Non-Condensable Purge. Evacuate anempty container to 2 kPa. Record the emptyweight of the container. Place the container in adry ice bath. Connect the equipment purgeconnection to the container and operate purgeaccording to operating instructions so as tocapture the non-condensables and lost refrigerant.Weigh the cylinder after the recycling is complete.Equivalent means are permissible.

For units which either recycle or list non-condensable removal, non-condensable gases arepurged, operating the recycle device per themanufacturers instructions through an evaporatorpressure regulator (EPR) valve into a liquidnitrogen-chilled cylinder. This combination willsimulate the atmosphere while allowing thecapture of purge gases. The cylinder is weighedbefore and after the purge procedure.

C7.5.2 Oil Draining. Refrigerant removedfrom the oil after draining shall be collected andmeasured in accordance with C5.6.2.1.

C7.6 Final Recovery Vacuum. The final recovery

C7.7 Residual Trapped Refrigerant. The amount ofresidual trapped refrigerant shall be the final weight

C7.8 Refrigerant Processed. The amount ofrefrigerant processed before changing filters (seeC5.7.3) shall be expressed in kg to an accuracy of1%.

C7.9 Contaminant Levels. The contaminant levelsremaining after testing shall be published as follows:

Moisture content, ppm by weightChloride ions, pass/failAcidity, ppm by weightHigh boiling residue, % (by volume)Particulates-solid, pass/fail (visual examination)Non-condensables, % (by volume)

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SizeRange

AsReceived Blend

0-5 12 6

5-10 12 6

10-20 14 7

20-40 23 11

40-80 30 32

80-200 9 38

APPENDIX D. PARTICULATE USED IN STANDARDCONTAMINATED REFRIGERANT

SAMPLE - NORMATIVE

D1 Particulate Specification. D1.3 Particle Size Analysis. The coarse air cleaner

D1.1 The particulate material (pm) will be ablend of 50% coarse air cleaner dust as received, and50% retained on a 200-mesh screen. A source for thecoarse air cleaner dust is:

AC Spark Plug DivisionGeneral Motors CorporationFlint, Michigan

D1.2 Preparation of Particulate Materials. Toprepare the blend of contaminant, first wet screen aquantity of coarse air cleaner dust on a 200-mesh screen(particle retention 74 pm).

This is done by placing a portion of the dust on a 200-mesh screen and running water through the screenwhile stirring the dust with the fingers. The finecontaminant particles passing through the screen arediscarded. The larger than 200-mesh particles collectedon the screen are removed and dried for one hour at110EC. The blend of standard contaminant is preparedby mixing 50% by weight of coarse air cleaner dust asreceived (after drying for one hour at 110EC) with 50%by weight of the >200-mesh screened dust.

dust as received and the blend used as the standardcontaminant have the following approximate particlesize analysis:

Wt. % in various size ranges, pm.