Installing the Refrigerant Pipe Work
Connect the manifold gauge to the liquid side pipe
and gas side pipe.
Perform vacuum drying of the liquid side pipe and
gas side pipe using the vacuum pump.
Perform vacuum drying works for 2 hours and 30
minutes or more.
Close the valve after checking the vacuum gauge
pressure has reached at 5Torr.
Pressure Increase
Fill refrigeration agent
CAUTION
• If pressure rises in an hour, moisture remains in the pipe work or there is a leak.
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English
Yes
No
No
Make sure that install check valve to prevent pump oil
from flowing into the pipe.
The time of vacuum drying may differ depending on
the length of the pipe or outdoor temperature. Perform
vacuum drying for at least 2 hours and 30 minutes.
Check the vacuum pressure using the vacuum gauge.
Check for gas leakage
purging the system with nitrogen to absorb
moisture and then vacuum
system again.(0.05 Mpa)
Vacuum desiccate again, to reach 5Torr
(666.6Pa, 0.0067 kgf/cm², 5 mmHg).
(2 hours and more)
Pressure Increase
Yes