SiE33-102 Appendix
General Information 121
7.8.4 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
(3.33KPa) 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 the solenoid and check 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.
Si33-102.book Page 121 Tuesday, June 26, 2001 3:18 PM
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