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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 a welded joint, take care as any oil left in the piping may burn in a
momentary flash of fire when the weld 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) × 1042
(Specific volume of oil: 1042 [cc/kg])
Compressor model
DA421A3FB-28M
DA421A3TB-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.
1
Amount of oil in faulty compressor A [cc]: 0
(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）
22.7
22.0
Compressor
(kg)
A < 1000
– 250 –
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