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Appendix
SiEN34-705
198
General Information
7.14.4 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
.
Outdoor unit
Indoor unit
Pressure gauge
Closed
Closed
Gas pipe
Liquid pipe
Nitrogen Gas
Electronic
expansion valve
Filter
Filter
Heat exchanger
Содержание RXQ10PY1
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