Air Tightness Test And Vacuum Drying - Samsung AM MXVAFC Series Installation Manual

Air tightness test and vacuum drying

Air tightness test
f Use tools for R-410A to prevent the inflow of foreign substances and resist against the internal pressure . f
f Do not remove the core of filling port . f
f Use Nitrogen gas for air tightness test as shown in the illustration . f
C/O
Low pressure side
Filling port
Gas pipe
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) .
Keep it for minimum 24 hours to check if pressure drops .
If the pressure drops, check for gas leakage .
Maintain 1 . 0 MPa(145psi) of the pressure before
performing vacuum drying and check for further gas
leakage .
• Perform a Nitrogen gas leak test with the service valve of the outdoor unit closed .
• When charging the nitrogen gas, charge it from the both (high•low pressure) sides .
CAUTION
• 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 .
Manifold gage
High pressure
side
Service valve
Liquid pipe
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 .
After applying Nitrogen gas, check there's any change of
pressure, using a pressure regulator .
If the pressure is changed, apply soap water to check for leakage
and check the pressure of the nitrogen gas again .
After checking the first gas leakage, maintain 1 . 0 MPa(145psi) to
check for further gas leakage .
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