8-5. In case of compressor malfunction
●
Should the compressor malfunction, be sure to replace compressor as quickly as
possible.
●
Use only the tools indicated exclusively for R407C.
➞
See "10-3. Tools specifically
for R407C".
8-5-1.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:
55
CAUTION
(1). Recovering refrigerant
OK
(2). Replacing compressor
OK
(3). Checking for sealing
OK
(4). Evacuation
OK
(5). Recharging
Standard time of evacuation
Length of tubing
Less than 10 m
More than 10 m
Time
More than 10 min. More than 15 min.
