Replacement Of Compressors - Toshiba MMY-MAP0806FT8P-TR Service Manual

11-2. Replacement of Compressors

<Checking color of oil in troubled compressor>
• Lay the faulty 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
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.
[When replacing troubled compressor only]
<Measuring amount of oil in troubled compressor>
Amount of oil in troubled compressor: A [cc] = (Weight of compressor as it was dismantled (kg) - D) x
1042 (Specific volume of oil: 1042 [cc/kg])
Compressor model
RA641A3TB-20M
RA421A3TB-20MD
※
Please check the type name of the compressor as it was dismantled.
<Adjusting amount of oil in new compressor> (1900cc at shipment)
• Perform the adjustment on the basis of how much oil the troubled compressor contained, A [cc], by following
the steps below.
Amount of oil in faulty compressor A [cc]: 0 ≤ A < 1000
1
(1) Adjust the amount of oil in the new compressor to 1000cc.
(Lay the new compressor down and draw 900 [cc] of oil via the oil-equalization pipe.)
Notes:
• Do not draw more than 900 [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".
Replace the troubled compressor only.
Replace both the troubled compressor and the normal compressor(s).
Oil equalization
pipe
Ｄ：Weight
(not include oil）
23.6
21.9
Compressor
(kg)
− 260 −