McQuay MDS030AR User Manual

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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/cm
2
pressure gas for more than 3 minutes---may be can find
big gap;
Second step, keep 15.0kg/cm
2
pressure gas for more than 3 minutes---may be can
find big gap;
Third step, keep 28.0kg/cm
2
pressure gas for more than 24 hours.
Notes: Keep the 28.0kg/cm
2
pressure gas must more than 24 hours.
The pressure can not be more than 28.0kg/cm
2
!
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/cm
2
and the ambient
temperature is 25 ; after 24 hours, the pressure is 27.5kg/cm
2
and the tempera-
ture is 20 , then you can have a conclusion that it is OK.
24 hours
First step
Pass
Work flow
Second step
Pass
15kg/cm
2
x 3min.
3kg/cm
2
x 3min.
30kg/cm
2
28kg/cm
2
3kg/cm
2
0kg/cm
2
15kg/cm
2
Third step 
3min. 3min.
Pressure
24 hours later, if the
pressure remains to
28kg/cm
2
, then pass
Pass
No
yes
Pressure
charging
Pass
check and
maintain it
refrigerant piping
assembly finished
is the pressure
released?

McQuay MDS030AR Specifications

General

Brand	McQuay
Model	MDS030AR
Category	Air Conditioner
Language	English