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Design & installation Guide For McQuay MDS Multi System
4.3.7 Process sequence of air leakage test
■ Main points of testing
Please test as follows:
● The Pressure charging must be tested both in liquid pipe and gas pipe.
◆ First step, keep 3.0kg/cm2 pressure gas for more than 3 minutes---may be can find big gap;
◆ Second step, keep 15.0kg/cm2 pressure gas for more than 3 minutes---may be can
find big gap;
◆ Third step, keep 28.0kg/cm2 pressure gas for more than 24 hours.
Notes:
Keep the 28.0kg/cm2 pressure gas must more than 24 hours.
The pressure can not be more than 28.0kg/cm2!
● Check the pressure decrease or not
◆ If the pressure remain the same, then it is OK;
◆ If the pressure decrease, then we should find out the leak gap.
◆ If the ambient temperature when pressure is charged is different from the temperature when
observing, the pressure need to be modified as follows:
Modified value = (temperature when pressure is charged- temperature when observing)x 0.1;
e.g.: when pressure is charged to 28.0kg/cm2 and the ambient temperature is 25℃; after
24 hours, the pressure is 27.5kg/cm2 and the temperature is 20℃, then you can
have a conclusion that it is OK.
No
yes
Pressure
charging
Pass
check and
maintain it
refrigerant piping
assembly finished
is the pressure
released?
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