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

More documents

Recommendations

Info

5 Retrofitting EXISTING CFC OR HCFC SYSTEMS ISOLATE COMPRESSOR DRAIN MINERAL OIL REFILL WITH ALTERNATIVE OIL OPERATE SYSTEM DRAIN OIL IF > 5.0 % CHECK OIL CONTAMINATION The procedures to perform this retrofitting are explained below. If the ODS refrigerant replacement is being performed with the use of a “dropin” refrigerant, some of the steps presented may not be necessary. It is important always to consult the refrigerant manufacturer’s guidelines for retrofitting and the use of “drop-in” refrigerants. The retrofit to flammable refrigerants (such as hydrocarbons) must be executed taking into considerations safety aspects. IF < 5.0 % FILL ALTERNATE REFRIGERANT REMOVE CFC OR HCFC REFRIGERANT REFILL WITH ALTERNATIVE OIL 112
5 Retrofitting General retrofitting process flows The specific procedures are: Retrofitting stationary RAC systems 4 MVAC retrofitting procedure 4 Retrofitting stationary RAC systems Here are the sequential steps involved in a retrofit of a CFC or HCFC based system. 1 - Record the system performance data prior to retrofit in order to establish the normal operating conditions for the equipment. Data should include temperatures and pressure measurements throughout the system, including the evaporator, compressor suction and discharge, condenser and expansion device. These measurements will be useful when adjusting the system during the retrofit. 2 - Pump down the system and recover the refrigerant before opening the refrigeration system. 3 - Recovered refrigerant must be stored only in a specified refillable container or cylinder and properly labelled. 4 - Recovery of refrigerant shall be done using a recovery machine or a recovery and recycling machine, operated only by a qualified technician. 5 - Knowing the recommended CFC or HCFC charge size for the system is helpful. If it is not known, weigh the entire amount of refrigerant removed. This amount can be used as a guide for the initial quantity of replacement refrigerant to be charged into the system. 6 - The technician should exert all efforts to ensure the prevention of refrigerant emissions during the recovery operation. 113
Page 1 and 2:
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
Page 13 and 14:
Introduction Choose your chapter Th
Page 15 and 16:
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 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: 5 Retrofitting • Upon evaluation
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
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
show all

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

Create successful ePaper yourself

Delete template?

Save as template?