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Appendix
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
The system was pressurized from the liquid pipe side and the gas pipes were therefore not
Problem and
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
Remedial Action
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.
198
Indoor unit
Heat exchanger
Electronic
Filter
Filter
expansion valve
Pressure gauge
Outdoor unit
Closed
Closed
SiEN34-705
General Information
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