12-2. 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 Replace the troubled compressor only.
ASTM grade: 4 or above Replace both the troubled compressor and 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.
<Adjusting amount of oil in new compressor> (0.502 gal at shipment)
• Perform the adjustment on the basis of how much oil the troubled compressor contained, A [gal], by
following the steps below.
1 Amount of oil in faulty compressor A [gal]: 0 ≤ A < 0.264
(1) Adjust the amount of oil in the new compressor to 0.264 gal.
(Lay the new compressor down and draw 0.238 [gal] of oil via the oil-equalization
pipe.)
Notes:
• Do not draw more than 0.238 [gal] of oil as it may cause damage to the compressor.
• If the troubled compressor contained 0.132 [gal] or less, there may have been a problem with the oil
equalization circuit, etc. Perform checks in accordance with “12-3. Check Procedure to Search Cause of
Compressor Oil Shortage”.
Compressor
Oil equalization
pipe
(lbs)
Compressor model
DA421A3TB-20M1
48.2
※Please check the type name of the compressor as it was dismantled.
Ｄ：Weight
[When replacing troubled compressor only]
<Measuring amount of oil in troubled compressor>
Amount of oil in troubled compressor: A [gal] = (Weight of compressor as it was dismantled
(lbs) - D) x 0.1249 (Specific volume of oil: 0.1249 [gal/lbs])
(not include oil）
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