Replacement Of Compressors - Toshiba MMY-MUP0801HT8P-TR Service Manual

11-2. Replacement of Compressors

<Checking color of oil in troubled compressor>
• Lay the troubled compressor down, draw a small amount of oil via the
oil equalization pipe, and check its color against color samples.
• Determine the number of compressors to be replaced according to the
color checking result.
ASTM grade: Below 4
ASTM grade: 4 or above
the normal compressor(s).
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.
Model: MMY-MUP0801*, 1001*, 1201*, 1401*, 2201* and 2401*
For 8, 10, 12, 14, 22, 24HP
[When replacing troubled compressor only]
<Measuring amount of oil in failured compressor>
Put the troubled compressor above the scale to measure the amount of oil.
Amount of oil in troubled compressor: A [cc] = (Weight of compressor as it was dismantled (kg) - 26.0kg) x 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 compressor> (1900 cc at shipment)
• Perform the adjustment on the basis of how much oil the troubled compressor contained, A [cc], by following
the steps below.
1
Amount of oil in troubled compressor A [cc]: 0
(1) Adjust the amount of oil in the new compressor to 1100 cc.
(Lay the new compressor down and draw 800 [cc] of oil via the oil-equalization pipe.)
Notes:
• Do not draw more than 800 [cc] of oil as it may cause damage to the compressor.
• 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
Amount of oil in troubled compressor A [cc]: 1100
(1) Adjust the amount of oil in the new compressor to A cc.
(Lay the new compressor down and draw (1900 - A) [cc] of oil via
the oil equalization pipe.)
3
Amount of oil in troubled compressor A [cc]: 1900
(1) Adjust the amount of oil in the new compressor to A cc.
(Insert a hose into the discharge pipe or oil equalization pipe of the
new compressor and inject (A-1900) [cc] of oil using a funnel, etc.)
Replace the troubled compressor only.
Replace both the troubled compressor and
A < 1100
A < 1900
A
- 266 -
Compressor
Oil equalization
pipe
Compressor