SiE33-102 Installation
General Information 27
3.2.5 Air Tight Test
Operational steps
Essential Points of
Testing
(Maintaining
Pressure Over a
Period)
The key to successful testing is strict adherence to the following procedure:
a) The liquid and gas piping in each refrigerant system should be pressurized in turn in accordance with
the following steps. (Nitrogen gas must be used.)
∗Increasing the system pressure to 3.20MPa does not guarantee the identification of minor leaks if
pressure is maintained for only a short time. It is therefore recommended that the system remain
pressurized in accordance with Step 3 above for at least 24 hours.
Note: The pressure must on no account be increased beyond 2.8MPa.
b) Check for pressure drop
If there is no drop in pressure then the test is deemed a success.
If the pressure drops then the leak must be located. See following page.
However, if there is a change in the ambient temperature between the pressurizing stage and the time
when you check for a drop in pressure then you will have to adjust your calculations accordingly since a
change of 1˚C can account for a pressure change of approximately 0.01MPa.
Compensating adjustment value:
(temperature at time of pressurizing – temperature at time of checking) × 0.1
Example:
Time of pressurizing: 2.8MPa 25˚C
24 hours later: 2.75MPa 20˚C
The pressure drop in such a case is deemed to be zero (successful test).
Complete
refrigerant pipe
installation work
Pressurize Check for pressure drop Success
Locate and repair leaks
(V0987)
Step 1: increase pressure to 0.3MPa for 3
minutes or more
Indicates existence of major leaks
Step 2: increase pressure to 1.5MPa for 3
minutes or more
Indicates existence of minor leaks
Step 3: increase pressure to 2.8MPa for
approx. 24 hours
Si33-102.book Page 27 Tuesday, June 26, 2001 3:18 PM
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