Toshiba MMY-MAP0806HT7(J)P, Service Manual

Page: 257 / 350

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 Replace the faulty compressor only.
ASTM grade: 4 or above Replace both the faulty compressor and the normal compressor(s).
WARNING
When detaching a pipe by heating with a burner a
t 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.
<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.
1
Amount of oil in faulty compressor A [cc]:
0 ≤ A < 1000
(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”.
Compressor
Oil equalization
pipe
<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])
(kg)
Compressor model
RA641A3TB-20 M
2
4
.
5
RA421A3TB-20MD 22.0
※
Please check the type name of the compressor as it was dismantled.
Ｄ：
Weight
[When replacing faulty compressor only]
(
not include oil
）
− 2 5 6 −