Air Tightness Test And Vacuum Drying - Samsung DVM S Series Installation Manual

Air tightness test and vacuum drying

Air tightness test
Use tools for R-410A to prevent the inflow of foreign substances and resist against the internal pressure.
Do not remove the core of filling port.
Use Nitrogen gas for air tightness test as shown in the illustration.
H/P
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 4.1MPa.
Keep it for minimum 24 hours to check if pressure drops.
If the pressure drops, check for gas leakage.
Maintain 1.0MPa 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.
CAUTION
• When charging the nitrogen gas, charge it from the both (high•low pressure) sides.
• 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 4.1MPa, from entering into the pipe.
80
Manifold gage
High pressure
side
Service valve
Liquid pipe
H/R
Low pressure side
Filling
port
Gas
pipe
Liquid
pipe
If you apply pressure at more than 4.1MPa, 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 1.0MPa to check for
further gas leakage.
Manifold gage
High
pressure
side
Service valve
High pressure
gas pipe