In Case Of Replacing Of Both Troubled And Normal Compressors; Measurement Of Oil Amount In The Normal Compressor; Adjustment Of Oil Amount In The Service Compressor - Toshiba Super MMU-AP0091H Service Manual

[In case of replacing of both troubled and normal compressors]

<Removal of normal compressor>
• Remove the normal compressor same as the case to remove the troubled compressor.
(NOTE)
• Be sure to apply insulation to the removed cable terminals with insulating tape, etc.
Be careful that oil in the pipe may emit fire when broiling the welded point with a burner.
<Measurement of oil amount in the normal compressor>
• As same as measurement of oil amount in the troubled compressor, put the compressor on a scale and
measure oil amount.
Oil amount of the normal compressor: B [cc] = (Removed compressor mass (kg) –23.5) × 1042
(NOTE)
• When the compressor holds no oil, the compressor mass is 23.5kg.
<Adjustment of oil amount in the service compressor>
• Adjust oil amount by the contents below:
Based on oil amount of troubled compressor: A[cc] and oil amount of normal compressor: B [cc]
1. In case of the total oil amount of the compressors: A + B [cc] is
1) Adjust oil amount in the two service compressors to 1000cc each. (Total: 2000cc)
• Lay down the two service compressors, and then extract oil by 900 [cc] from each oil-equalization pipe.
(NOTE)
• Do not extract oil over 900 [cc] because a trouble may be caused on the compressor.
• If oil amount of the troubled compressor is below 500cc, a trouble on the oil-equalization circuit, etc is
considered. Check the compressor based upon "15-3. Check procedure search the cause of com-
pressor oil shortage".
2. In case of total oil amount: A + B [cc] is 2000 < A + B < 3800
1) Adjust oil amount in the two service compressors to A + B [cc] each.
• Lay down the two service compressors and then extract oil by
3800 – (A + B) [cc] from each oil-equalization pipe.
2
3. In case of total oil amount of the compressors: A + B [cc] is
1) Adjust oil amount in the two service compressors to A + B [cc] each.
(Insert a hose into the discharge pipe or oil-equalization pipe of the
service compressor, and then add oil by
 A + B – 1900  [cc] using a funnel or so on.)
 
2
WARNING
(Specific gravity of oil: 1042 [cc/kg])
0 < A + B < 2000
2
3800 < A
2
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Compressor