Toshiba MMY-MUP0801HT8P-TR Service Manual page 268

Model: MMY-MUP2201* and 2401*
For 22, 24HP
[When replacing normal as well as troubled compressor] - applicable to
<Remove the normal compressor>
• Remove the normal compressor in the same way as the troubled compressor.
Note:
• Be sure to insulate the removed compressor leads using insulation tape, etc.
WARNING
When detaching a pipe by heating with a burner at brazed joint, take care as any oil left in the piping may burn
in a momentary flash of fire when the brazing filler metal melts.
<Measuring amount of oil in normal compressor>
• As was the case with the troubled compressor, measure the amount of oil contained by placing the
compressor on a scale.
Amount of oil in normal compressor: B [cc] = (Weight of compressor as it was dismantled (kg) - 26.0 kg) × 1042
(Specific volume of oil: 1042 [cc/kg])
* The weight of the compressor without oil inside is 26.0 kg.
<Adjusting amount of oil in new compressors>
• Perform the adjustment on the basis of how much oil the failure compressor contained, A [cc], and how much
oil the normal compressor contained, B [cc], by following the steps below.
1
Combined amount of oil in troubled and normal compressors A+B [cc]: 0
(1) Adjust the amount of oil in the two new compressors to 1000 cc each (total 2200 cc).
• Lay the compressors down and draw 800 [cc] of oil from each of them via their oil equalization pipes.
Notes:
• Do not draw more than 800 [cc] of oil from a compressor as it may cause damage.
• If the troubled compressor contained 500cc or less, there may have been a problem with the oil equalization
circuit, etc. Perform checks in accordance with "11-3. Check Procedure to Search Cause of Compressor Oil
Shortage".
2
Combined amount of oil in troubled and normal compressors
A+B [cc]: 2200 A+B < 3800
(1) Adjust the amount of oil in the two new compressors to (A+B)/2 cc each.
• Lay the compressor down and draw [3800-(A+B)]/2 [cc] of oil from
each of them via their oil equalization pipes.
3
Combined amount of oil in troubled and normal compressors
A+B [cc]: 3800 A+B
(1) Adjust the amount of oil in the two new compressors to (A+B)/2 cc
each.
(Insert a hose into the discharge pipe or oil equalization pipe of each
compressor and inject (A+B)/2-1900 [cc] of oil using a funnel, etc.)
- 268 -
A+B < 2200
Compressor