Si39-303
Appendix
General Information
147
7.12.4 Example 4:
Pressure down despite absence of leaks during air tight
test
(all model)
Situation
In order to carry out local air tight tests on the refrigerant piping the system was pressurized via the liquid
pipe service port and after 24 hours the pressure was found to have fallen. The local refrigerant piping
alone does not lose any pressure. Maybe the gas leak is supposed to be located in the indoor unit itself.
Source of
Problem and
Remedial Action
The system was pressurized from the liquid pipe side and the gas pipes were therefore not pressurized.
The system was then left under pressure for 24 hours but during that time gas leaked through into the gas
pipes due to internal leaks within electronic expansion valves and the gas pressure inside the liquid pipes
consequently dropped.
Main Points
When carrying out air tight tests on local pipework
it is essential that the system be pressurized via
both the liquid pipes and the gas pipes
.
Heat exchanger
Fan
Electronic
expansion valve
Filter
Filter
Indoor unit
Summary of Contents for VRV II Series
Page 6: ...Si39 303 iv Table of Contents...
Page 31: ...Si39 303 Installation General Information 25 Flaring Procedure...
Page 124: ...Appendix Si39 303 118 General Information 3P114237A...
Page 141: ...Si39 303 Appendix General Information 135 RXYQ8MY1B RXYQ10MY1B RXYQ12MY1B 4D040338A...
Page 142: ...Appendix Si39 303 136 General Information RXYQ14MY1B RXYQ16MY1B 4D040339A...
Page 144: ...Appendix Si39 303 138 General Information 7 11 Wiring Diagrams 7 11 1 Outdoor Unit RXYQ5MY1B...
Page 145: ...Si39 303 Appendix General Information 139 RXYQ8MY1B RXYQ10MY1B RXYQ12MY1B 3D038582...
Page 146: ...Appendix Si39 303 140 General Information RXYQ14MY1B RXYQ16MY1B 3D038058...
Page 147: ...Si39 303 Appendix General Information 141 7 11 2 Field Wiring RXYQ5 16MY1B 3D040746...
Page 148: ...Appendix Si39 303 142 General Information RXYQ18 32MY1B 3D040747...
Page 149: ...Si39 303 Appendix General Information 143 RXYQ34 48MY1B 3D040748...
Page 158: ...Appendix Si39 303 152 General Information...
Page 180: ...Refrigerant Piping Si39 303 174 Installation Manual...
Page 226: ...Troubleshooting Si39 303 220 Operation Manual...