Replacement Of Compressors - Toshiba MMY-MAP0806HT8(J)P Service Manual

11-2. Replacement of Compressors

<Checking color of oil in faulty 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 faulty compressor only]
<Measuring amount of oil in faulty compressor>
Amount of oil in faulty 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 faulty 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 faulty 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 faulty compressor only.
Replace both the faulty compressor and the normal compressor(s).
Oil equalization
pipe
Ｄ：Weight
(not include oil）
24.5
22.0
Compressor
(kg)
− 230 −