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12-5. In Case of Compressor Malfunction
12-5-1. Procedure for replacing compressor
(1) Recovering refrigerant
●
Any remaining refrigerant inside the unit should not be
released to the atmosphere, but recovered using the
refrigerant recovery unit for R410A.
●
Do not reuse the recovered refrigerant, since it will
contain impurities.
(2) Replacing Compressor
●
Soon after removing seals of both discharge and suc-
tion tubes of the new compressor, replace it quickly.
(3) Checking for sealing
●
Use nitrogen gas for the pressurized gas, and never
use a refrigerant other than R410A. Also do not use
oxygen or any flammable gas.
(4) Evacuation
●
Use a solenoid valve-installed vacuum pump
so
that even if power is cut off in the middle of evacuation
of air due to a power interruption, the valve will pre-
vent the pump oil from flowing back.
●
The equipment may be damaged if moisture remains
in the tubing, thus carry out the evacuation thoroughly.
●
When using a vacuum pump with exhaust air volume
more than 25L/min. and ultimate vacuum pressure
rate of 0.05Torr:
Standard time for evacuation
CAUTION
●
Should the compressor malfunction, be sure to make the switch to a replacement
compressor as quickly as possible.
●
Use only the tools indicated exclusively for R410A.
➞
See “12-3. Tools
Specifically for R410A.”
(1) Recover refrigerant
OK
(2) Replace compressor
OK
(3) Check for sealing
OK
(4) Evacuation
OK
(5) Recharge
Length of tubing
Less than 10 meters
More than 10 meters
Time
More than 10 minutes
More than 15 minutes
