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9-5. In case of compressor malfunction
● Should the compressor malfunction, be sure to replace compressor as quickly as
CAUTION
● Use only the tools indicated exclusively for R407C. ➞ See "10-3. Tools specifically
10-5-1.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 R407C.
• Do not reuse the recovered refrigerant, since will
contain impurities.
(2) Replacing compressor
• Soon after removing pinched pipes of both discharge
and suction 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 R407C. 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
prevent 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 of evacuation
Length of tubing
Time
More than 10 min. More than 15 min.
possible.
for R407C".
Less than 10 m
More than 10 m
(1). Recovering refrigerant
(2). Replacing compressor
(3). Checking for sealing
(4). Evacuation
(5). Recharging
39
OK
OK
OK
OK
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