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

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3 Refrigerant Management CHAPITRE 3 PAGE 10 Recovery methods Since a recovery unit will remove more refrigerant from a system than any other practicable method, its use should be regarded as the norm and not the exception. Recovery units are being more widely used due to their increasing availability. It is important to use appropriate equipment considering the characteristics of the refrigeration or air conditioning system and the technical specifications of the recovery unit regarding mainly capacity of the unit, rate of recovery, and type of refrigerant that can be recovered. As with vacuum pumps, recovery Condenser Filters Oil Separator Receiver Compressor Accumulator units will work much more efficiently if connection hoses are kept as short and as large in diameter as possible. However, not being able to get a recovery unit close to a system is not an acceptable excuse for not using one. If long hoses have to be used, all that will happen is that recovery will take longer. There is no longer any acceptable reason or excuse for releasing refrigerants into the atmosphere. These images show a typical configuration and the main components of a recovery unit. High-Pressure Cuto� Coaxial Coil 68 Configuration and the main components of a recovery unit
3 Refrigerant Management Open Refrigerant recovery unit Open Open Open Recovery Unit Using recovery units Recovery units are connected to the system by available service valves or line tap valves or line piercing pliers as shown in the image. Some of them can handle refrigerants in vapour phase and others in both vapour and liquid phases by throttling the liquid before it enters the compressor. For vapour-only recovery machines, it must be ensured that the compressor does not suck in liquid refrigerant as this will cause serious damage. Many have onboard storage vessels. Recovery Cylinder CHAPITRE 3 PAGE 11 Scale Connection of a recovery unit to a refrigeration system 69
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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
Page 9 and 10:
Introduction Characteristics of Sel
Page 11 and 12:
Introduction Another form of refere
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Introduction Choose your chapter Th
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1 Environmental impact of refrigera
Page 17 and 18: 1 Environmental Impact The ozone la
Page 19 and 20: 1 Environmental Impact RADIATION FR
Page 21 and 22: 1 Environmental Impact The ozone la
Page 23 and 24: 1 Environmental Impact Effects of o
Page 25 and 26: 1 Environmental Impact The greenhou
Page 27 and 28: 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: 3 Refrigerant Management Refrigeran
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 and 116: 5 Retrofitting procedures that you
Page 117 and 118: 5 Retrofitting MVAC retrofitting pr
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5 Retrofitting Although, in general
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5 Retrofitting Further reading UNEP
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6 Summary 6.1. Overview of refriger
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6 Safe Refrigerant Handling Oxygen
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6 Safe Refrigerant Handling The com
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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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