ENGLISH-74
Air tightness test and vacuum drying
AM
777
HXWAF
7
/ AM
777
HXWAJ
7
Manifold gauge
Filling port
High pressure gas pipe
Liquid pipe
Low pressure gas pipe
N
itr
ogen gas
Apply pressure to the liquid side pipe and gas side pipe
(when installing outdoor units in module) with Nitrogen
gas at 4.1 MPa (594.6 psi).
If you apply pressure at more than 4.1 MPa (594.6 psi), pipes
may get damaged. Apply pressure with pressure regulator and
pay attention to the pressure of the nitrogen.
Keep it for minimum 24 hours to check if pressure drops.
After applying Nitrogen gas, check there's any change of
pressure, using a pressure regulator.
If the pressure drops, check for gas leakage.
If the pressure is changed, apply soap water to check for leakage
and check the pressure of the nitrogen gas again.
Maintain 1.0 MPa (145 psi) of the pressure before
performing vacuum drying and check for further gas
leakage.
After checking the first gas leakage, maintain 1.0 MPa (145 psi) to
check for further gas leakage.
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Perform a Nitrogen gas leak test with the service valve of the outdoor unit closed.
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If the pipe is filled in a short time with a highly excessive pressure of Nitrogen gas, the pipes may get damaged.
Make sure to use a regulator to prevent the high pressure Nitrogen gas, over 4.1 MPa (594.6 psi), from entering
into the pipe.
CAUTION
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