Work Flow - McQuay MDS030AR Applications Manual

Design & installation Guide For McQuay MDS Multi System
-86-
4.3.7 Process Sequence of Air Leakage Test
refrigerant piping
assembly finished
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
big gap;
Second step, keep 15.0kg/cm
find big gap;
Third step, keep 28.0kg/cm
Notes: Keep the 28.0kg/cm
The pressure can not be more than 28.0kg/cm
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
temperature is 25
ture is 20
30kg/cm
28kg/cm
15kg/cm
Pressure
2
3kg/cm
2
0kg/cm
Pressure
charging
2 pressure gas for more than 3 minutes---may be can find
2 pressure gas for more than 3 minutes---may be can
2 pressure gas for more than 24 hours.
2 pressure gas must more than 24 hours.
2
; after 24 hours, the pressure is 27.5kg/cm
, then you can have a conclusion that it is OK.

Work flow

2
2
Second step
2
15kg/cm x 3min.
2
First step
2
3min.
3kg/cm x
24 hours
3min. 3min.
is the pressure
released?
yes
check and
maintain it
!
Third step
24 hours later, if the
pressure remains to
2
28kg/cm
Pass
Pass
No
Pass
2 and the ambient
2
and the tempera-
Pass
, then pass