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

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3 Refrigerant Management Examples of refrigerant recovery Now you have relevant download and read the briefing, attempt to apply the information to the following examples. Domestic refrigerator 4 Commercial cold room system 4 Air-conditioning system 4 Mobile air conditioning (MAC) system 4 80
3 Refrigerant Management CHAPITRE 3 PAGE 24 Recovery from a domestic refrigerator It is possible to recover refrigerant from a hermetically sealed system, which has no service valve. A line-tap valve (piercing valve) should be fitted to the system, and a recovery unit used to remove the refrigerant from the unit via the line-tap as with the larger system. Line-tap valves should never be left permanently in place, but removed after use if placed on the process tube (if the equipment is going for disposal). Because of the small charge of refrigerant, only vapour recovery is needed. It is recommended to install tap-valves on both and low pressure side, as shown here: Recovery from a domestic refrigerator Recovery from commercial cold room system Liquid transfer Connect the recovery cylinder’s hose to the system’s outlet stop valve on the condenser/receiver. To control liquid flow, install a sight glass to the hose and cylinder. From the recovery cylinder’s vapour side, use a drier. Outlet/discharge side of the recovery unit goes to the system’s high-pressure side at the inlet condenser or compressor high-pressure stop valve. All of the system’s stop valves have to be opened, including the solenoid valves. Run the recovery unit and keep an eye on the sight glass. When there is no more liquid transferred through the sight glass, and there is no icing left on the compressor shell, on the receiver or anywhere else, this indicates there is negligible amounts of refrigerant left in the system. Vapour transfer When liquid transfer is completed, connect the hoses from the recovery unit suction/inlet side to the compressor low or highpressure side. For better recovery, connect hoses to both the high and low pressure sides using a service manifold. The recovery discharge/outlet side should be connected to the recovery cylinder’s vapour side. Be sure that all service/shut off valves are open to avoid “locking” refrigerant into the system. 81
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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
Page 7 and 8:
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
Page 29 and 30: 1 Environmental Impact Alternative
Page 31 and 32: 1 Environmental Impact The way forw
Page 33 and 34: 2 Refrigerants 2.1. Section objecti
Page 35 and 36: 2 Refrigerants Chemical properties
Page 37 and 38: 2 Refrigerants Safety characteristi
Page 39 and 40: 2 Refrigerants Types of refrigerant
Page 41 and 42: 2 Refrigerants Those with ozone dep
Page 43 and 44: 2 Refrigerants Those with zero ozon
Page 45 and 46: 2 Refrigerants Carbon dioxide (CO2,
Page 47 and 48: 2 Refrigerants Azeotropic Blends An
Page 49 and 50: 2 Refrigerants Using Refrigerant Bl
Page 51 and 52: 2 Refrigerants Lubricants Today, al
Page 53 and 54: 2 Refrigerants Refrigerants and app
Page 55 and 56: 2 Refrigerants Properties of most c
Page 57 and 58: 3 Refrigerants Content Management M
Page 59 and 60: 3 Refrigerant Management The majori
Page 61 and 62: 3 Refrigerant Management Handling o
Page 63 and 64: 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 77 and 78: 3 Refrigerant Management CHAPITRE 3
Page 79: 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 and 116: 5 Retrofitting procedures that you
Page 117 and 118: 5 Retrofitting MVAC retrofitting pr
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
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6 Safe Refrigerant Handling Safe ha
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6 Safe Refrigerant Handling leak de
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6 Safe Refrigerant Handling • Lea
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6 Safe Refrigerant Handling Storage
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6 Safe Refrigerant Handling Recomme
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6 Safe Refrigerant Handling 3 - Sho
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Glossary Glossary Absolute pressure
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Glossary Fossil fuels Carbon-based
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Glossary hole in late 1985, governm
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Glossary Sealed system A refrigerat
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Acknowledgements Acknowledgements I
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Copyright Copyright © United Natio
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