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Air tightness test and vacuum drying
Vacuum drying pipes and indoor units
pump is stopped.
Completely close the liquid gas side service valve of the outdoor unit.
Connect the manifold gauge to the liquid
side pipe and gas side pipe (when installing
outdoor units in module).
Perform vacuum drying of the liquid side pipe
and gas side pipe (when installing outdoor
units in module) using a vacuum pump.
After vacuum pump stops, check whether the
Torr) for an hour.
No
Charge additional refrigerant to the pipe
If the pressure rises in an hour, either water is remaining inside the pipe or there is a leakage.
within the pipe. Therefore, pay special attention to the pipe sealing in the winter.
76
gauge to liquid side pipe and the gas side pipe.
Make sure that check valve is installed to prevent pump oil from
Check for gas leakage
Vacuum destruction
Yes
• Apply nitrogen gas to the pipe at
Perform vacuum drying again
No
Pressure increase
Yes
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