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Installation 1
3.2.10
Air Tight Test
Essential Points of
The key to successful testing is strict adherence to the following procedure:
Testing
a) The liquid and gas piping in each refrigerant system should be pressurized in turn in accordance with
(Maintaining
Pressure Over a
Period)
∗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
46
Operational steps
Pressurize
Complete
refrigerant pipe
installation work
the following steps. (Nitrogen gas must be used.)
Step 1: increase pressure to 0.3MPa for 3
minutes or more
Step 2: increase pressure to 1.5MPa for 3
minutes or more
Step 3: increase pressure to 2.8MPa for
approx. 24 hours
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).
PACD011001G2 / PACD011004G3
Check for pressure drop
Locate and repair leaks
Indicates existence of major leaks
Indicates existence of minor leaks
Urban Multi Inverter "MX1" Series
Success
(V0987)
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