Hitachi RAS-(3-6)HVNC1(E) Service Manual page 495

12 Maintenance notes
No.
Perform the replacement of the compressor and the change
of the refrigerant oil according to the section "replacing the
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compressor".
Perform the vacuum from the check joint of the low-pressure
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side.
Open the liquid stop valve and the gas stop valve comple-
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tely when you finish the vacuum.
Make sure that the power is turned OFF and attach the
following items: the power supply wire the thermistor the
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crankcase heater the 63H wiring the panel and the nut).
Set the DSW back to the original setting. Make sure that all
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the wirings to the compressor are connected correctly.
Recharge the refrigerant that is collected in the process by
18 the stop valve of the liquid side during the cooling at the
TEST RUN mode.
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SMGB0087 rev.0 - 12/2013
Procedure Remarks
Make sure that you follow the instructions.
If you collect the refrigerant only on the low-pressure side
(A in 10). You cannot perform the vacuum of the refrigerant
from the check joint of the high-pressure side.
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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 0.5 kg.
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