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Appendix
Si39-406
126
General Information
7.10.4 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 REYQ96MTJU
Page 1: ...Design Installation Testing Instruction R410A Heat Recovery 60Hz REYQ96MTJU Si39 406...
Page 6: ...Si39 406 iv Table of Contents...
Page 34: ...Installation Si39 406 28 General Information Flaring Procedure...
Page 68: ...Installation Si39 406 62 General Information Caution Caution label 3P124617 4P124614...
Page 114: ...Appendix Si39 406 108 General Information 3P135887 1...
Page 126: ...Appendix Si39 406 120 General Information 7 8 3 BS Unit BSVQ36MVJ BSVQ60MVJ 4D045338...
Page 128: ...Appendix Si39 406 122 General Information 7 9 2 Field Wiring REYQ96MTJU 3D042647A...
Page 156: ...Refrigerant Piping Si39 406 150 Installation Manual REYQ96MTJU...
Page 158: ...Refrigerant Piping Si39 406 152 Installation Manual REYQ96MTJU...
Page 230: ...Precautions for New Refrigerant R410A Si39 406 224 Precautions for New Refrigerant R410...
Page 236: ...375 Park Avenue Suite 3308 New York N Y 10152 info daikinac com www daikinac com...