Toshiba MMU-AP0091H service manual Compressor Replacing Procedure Outline, 199

15. REPLACING COMPRESSOR

15-1. Compressor Replacing Procedure (Outline)

WARNING

Never recover the refrigerant into outdoor unit.

Be sure to use a refrigerant recovery device for refrigerant recovery for reinstallation or repair work. Recovery into the outdoor unit is unavailable; otherwise a serious accident such as rupture or ingury could occur.

START

Recover refrigerant from outdoor unit, using a suitable device.

Turn off power to the troubled outdoor unit.

Remove the troubled compressor.

Measure oil amount in 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.

YES

Replace both the malfunctioning compressor

and the normal compressor.

Measure the oil amount in the normal compressor.

Adjust oil amount based upon the measured oil amount.

Install two compressors.

Check for leakage in the malfunctioning outdoor unit.

Vacuum the malfunctioning outdoor unit.

NOTE) Full opening operation of PMV by CN30 short-circuiting rwill return to fully closed after 2 minutes have passed.

To continue full-opening status, turn off power to the outdoor unit within 2 minutes.

NO

Exchange the malfunctioning compressor only.

*This flowchart is the standard for replacing compressors. Each case must be considered on individual circumstances.

Replace the compressors based on the following conditions of judgement.

1.Oil of 1900 cc is charged in a compressor for service.

2.The amount of oil is 3800 cc in an outdoor unit at shipment.

3.When a compressor is removed, it usually contains 800 to 1400 cc of oil.

Oil separator usually holds 0 to 1000 cc of oil.

Charge the refrigerant.

END

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