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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
●
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.”
