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ENGLISH
Installing the Refrigerant Pipe Work (Continued)
Vacuum Drying
Use a manifold gauge for R410A to prevent the inflow of
foreign substances and resist against the internal pressure.
Use the vacuum pump with the check valve to prevent pump
oil from flowing backward while the vacuum pump is stopped.
Vacuum system to 5Torr (666.6Pa, 0.0067 kgf/cm², 5 mmHg).
Close the service valve of the liquid side pipe and gas side pipe
completely.
Pressure Increase
No
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.
Make sure that install check valve to prevent pump oil from
flowing into the pipe.
Perform vacuum drying works for
2 hours and 30 minutes or more.
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.
Close the valve after checking the vacuum
gauge pressure has reached at 5Torr.
Check the vacuum pressure using the vacuum gauge.
Fill refrigeration agent
Yes
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
No
Vacuum
pump
Liquid side pipe
Manifold gauge
High
pressure side
Low pressure side
Gas side
pipe
Service port
If pressure rises in an hour, moisture remains in the pipe work or there is a leak.
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2010-07-26 ｿﾀﾈﾄ 2:19:59
