Installation SiEN34-705
36 General Information
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 4.00MPa 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 4.00MPa.
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 4.00MPa for
approx. 24 hours
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