Replacing Compressor; Compressor Replacing Procedure - Toshiba Super MMU-AP0091H Service Manual

15. REPLACING COMPRESSOR

15-1. Compressor Replacing Procedure (Outline)
Is the outdoor unit a single system?
NO
Open PMV of the troubled
unit manually.
(Short CN30 on I/F P.C. board,
and turn off the power supply.),
and recover refrigerant by
refrigerant recovery device.
(NOTE)
Turn off power of the troubled outdoor unit.
Take off the troubled compressor.
Measure oil amount of the troubled compressor.
Check oil color of the troubled compressor.
ASTM: Is 4 or more?
Judge the oil status based on the oil color,
(
and then decide to exchange the troubled
compressor only or both compressors.
Replace both troubled compressor and normal compressor.
Measure oil amount of the normal compressor.
Adjust oil amount based upon the measured oil amount.
Install two compressors.
Check leakage of the troubled outdoor unit.
Vacuuming for the troubled outdoor unit.
Charge the refrigerant.
START
YES
Using refrigerant
recovery method at
replacing of
compressor, recover
the refrigerant.
YES
END
Never recover the refrigerant into out-
door unit.
Be sure to use a refrigerant recovery device for
refrigerant recovery in reinstallation or repair
work. Recovery into outdoor unit is unavailable;
otherwise a serious accident such as rupture or
injury will be caused.
NOTE) Full opening operation of PMV by CN30
short-circuiting returns full closing when 2
minutes passed.
To continue full-opening status, turn off
power of the outdoor unit within 2 minutes.
NO
Exchange the troubled compressor only.
)
* This flowchart is the standard one of compressor replacing.
Various cases are considered at each field
Replace the compressors based on the following
conditions of judgment.
1. Oil of 1900cc is charged in a compressor for service.
2. Oil amount is 3800cc in an outdoor unit at shipment.
3. When a compressor is removed, it usually includes oil
with 800 to 1400cc.
Oil separator usually holds oil with 0 to 1000cc.
242
WARNING