11 Maintenance notes
Pump-down method for replacing the compressor
SMGB0091 rev.2 - 11/2015
293
11
No.
Procedure
Remarks
11
After collecting the refrigerant, remove the change
hose (collector side) of the low-pressure side, so that
the low-pressure side of the refrigerant cycle will be the
atmosphere pressure.
-
Make sure that there is no pressure increase of the
low-pressure sides after collecting the refrigerant.
-
Make sure that the refrigerant cycle is the atmosphere
pressure. Otherwise, problems such as the blowing of
gas and the suction of the cutting material) may occur
when you are removing the compressors.
12
Turn OFF the main switch of the RASC unit.
-
13
Perform the replacement of the compressor and the
change of the refrigerant oil according to the section
“9.3.10 Replacement of the compressor”
.
Make sure that you follow the instructions.
14
Perform the vacuum from the check joint of the
low-pressure side.
If you collect the refrigerant only on the low-pressure side (A in
11). You cannot perform the vacuum of the refrigerant from the
check joint of the high-pressure side.
15
Open the liquid stop valve and the gas stop valve
completely when you finish the vacuum.
-
16
Make sure that the power is turned OFF and attach the
following items: the power supply wire, the thermistor, the
crankcase heater, the 63H wiring, the panel and the nut).
-
17
Set the DSW back to the original setting. Make sure that all
the wirings to the compressor are connected correctly.
-
18
Recharge the refrigerant that is collected in the process by
the stop valve of the liquid side during the cooling at the
TEST RUN mode.
If the replacement of the compressor takes more than two hours,
an additional change of the refrigerant is necessary.
Additional change = (replacing time – 2 hours) x 0.5kg.