Daikin VRV Plus Series General Information Manual page 122

Si33-003.book Page 118 Monday, June 25, 2001 9:06 AM
Appendix
7.9.4 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 The system was pressurized from the liquid pipe side and the gas pipes were therefore not pressurized.
and Remedial The system was then left under pressure for 24 hours but during that time gas leaked through into the gas
Action 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.
118
: http://splitoff.ru/tehn-doc.html
SiE33-003
General Information