Manual for Refrigeration Servicing Technicians - UNEP - Division of ...

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5 Retrofitting Retrofitting data sheet 116
5 Retrofitting MVAC retrofitting procedure Refer to the manufacturer’s retrofit procedures whenever available. The following are recommended procedures, specifically for retrofitting R12 MVAC systems to a R134a system: 1 - Check for leaks using a hand-held leak detector (refer also to SAE J1628: 2003) and set to detect R12 and/or use the soap bubble test. Make repairs if necessary. 2 - Run the vehicle to obtain suction and discharge pressures, which should be noted, and check again for leaks. 3 - Recover the entire refrigerant from the system following the standard procedure for CFC refrigerant recovery and store in a specified refillable container which is properly labelled. 4 - Remove the compressor from its mounting bracket and drain its lubricating oil. 5 - Rinse the internal parts by pouring alternative oil for new refrigerant into the compressor and manually rotating the compressor shaft. The amount of oil for rinsing is about 50% of the recommended factory oil charge. 6 - Repeat the oil rinsing procedure as necessary. 7 - Pour the proper amount of alternative refrigerant oil into the compressor as per the original equipment manufacturer (OEM) recommendations, and cap the suction and discharge lines until the system is ready for re-assembly. 8 - Flush the entire system with oxygen-free dry nitrogen and any cleaning agent not containing an ODS. 9 - Carry out tightness tests for each component for leaks. Repair or replace if necessary. 10 - Replace the expansion device and the filter drier with ones that are compatible with the alternative refrigerant. 11 - Change all flare type to O-ring type fittings. 12 - Replace all O-ring seals on pipes and hoses with those approved for R134a and PAG oils. 13 - Re-install and assemble system components. 14 - Modify the access valves/fittings to accept only the new alternative refrigerant fittings. 15 - Evacuate system to at least 1000 microns using the appropriate vacuum pump and an electronic vacuum gauge. Make corrections if necessary. 16 - Charge the system with the alternative refrigerant (SAE J1657: 2003) as recommended by the manufacturer whenever possible. Notice that the optimum charge will change when systems are retrofitted. 17 - Run the vehicle to observe the system operation and check again for leaks. 18 - Compare the new set of performance data to that obtained when the system was still using CFC. 19 - Label the system clearly. 117
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Manual for Refrigeration Servicing
Page 3 and 4:
Introduction When to use the manual
Page 5 and 6:
Introduction The Factors affecting
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Introduction How to assess conditio
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Introduction Characteristics of Sel
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Introduction Another form of refere
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Introduction Choose your chapter Th
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1 Environmental impact of refrigera
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1 Environmental Impact The ozone la
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1 Environmental Impact RADIATION FR
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1 Environmental Impact The ozone la
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1 Environmental Impact Effects of o
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1 Environmental Impact The greenhou
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1 Environmental Impact Timeline act
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1 Environmental Impact Alternative
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1 Environmental Impact The way forw
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2 Refrigerants 2.1. Section objecti
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2 Refrigerants Chemical properties
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2 Refrigerants Safety characteristi
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2 Refrigerants Types of refrigerant
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2 Refrigerants Those with ozone dep
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2 Refrigerants Those with zero ozon
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2 Refrigerants Carbon dioxide (CO2,
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2 Refrigerants Azeotropic Blends An
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2 Refrigerants Using Refrigerant Bl
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2 Refrigerants Lubricants Today, al
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2 Refrigerants Refrigerants and app
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2 Refrigerants Properties of most c
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3 Refrigerants Content Management M
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3 Refrigerant Management The majori
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3 Refrigerant Management Handling o
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3 Refrigerant Management Recovery c
Page 65 and 66: 3 Refrigerant Management Refrigeran
Page 67 and 68: 3 Refrigerant Management Refrigeran
Page 69 and 70: 3 Refrigerant Management Open Refri
Page 71 and 72: 3 Refrigerant Management CHAPITRE 3
Page 73 and 74: 3 Refrigerant Management Recycling
Page 75 and 76: 3 Refrigerant Management equipment
Page 79 and 80: 3 Refrigerant Management PAGE 22 Ex
Page 83 and 84: 3 Refrigerant Management Further re
Page 85 and 86: Summary This section will provide t
Page 87 and 88: 4 Servicing Practices Moisture Mois
Page 89 and 90: 4 Servicing Practices Non-condensab
Page 91 and 92: 4 Servicing Practices Evacuation A
Page 93 and 94: 4 Servicing Practices 7 - For large
Page 95 and 96: 4 Servicing Practices Pressure unit
Page 97 and 98: CHAPITRE 4 4PAGE 10 LEAK DETECTION
Page 99 and 100: 4 Servicing Practices Detection met
Page 101 and 102: 4 Servicing Practices CHAPITRE 4 PA
Page 103 and 104: 4 Servicing Practices Volumetric ch
Page 105 and 106: 4 Servicing Practices Electronic ch
Page 107 and 108: 4 Servicing Practices Why charge re
Page 109 and 110: 5 Retrofitting Content General retr
Page 111 and 112: 5 Retrofitting • Upon evaluation
Page 113 and 114: 5 Retrofitting General retrofitting
Page 115: 5 Retrofitting procedures that you
Page 119 and 120: 5 Retrofitting Although, in general
Page 121 and 122: 5 Retrofitting Further reading UNEP
Page 123 and 124: 6 Summary 6.1. Overview of refriger
Page 125 and 126: 6 Safe Refrigerant Handling Oxygen
Page 127 and 128: 6 Safe Refrigerant Handling The com
Page 129 and 130: 6 Safe Refrigerant Handling • Nev
Page 131 and 132: 6 Safe Refrigerant Handling Safe ha
Page 133 and 134: 6 Safe Refrigerant Handling leak de
Page 135 and 136: 6 Safe Refrigerant Handling • Lea
Page 137 and 138: 6 Safe Refrigerant Handling Storage
Page 139 and 140: 6 Safe Refrigerant Handling Recomme
Page 141 and 142: 6 Safe Refrigerant Handling 3 - Sho
Page 143 and 144: Glossary Glossary Absolute pressure
Page 145 and 146: Glossary Fossil fuels Carbon-based
Page 147 and 148: Glossary hole in late 1985, governm
Page 149 and 150: Glossary Sealed system A refrigerat
Page 151 and 152: Acknowledgements Acknowledgements I
Page 153: Copyright Copyright © United Natio
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