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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
→
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 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]
<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”.
2 Amount of oil in faulty compressor A [cc]: 1000
≤≤
≤≤
≤ A < 1900
(1) Adjust the amount of oil in the new compressor to A cc.
(Lay the new compressor down and draw (1900 - A) [cc] of oil via the oil equalization pipe.)
3 Amount of oil in faulty compressor A [cc]: 1900
≤≤
≤≤
≤ A
(1) Adjust the amount of oil in the new compressor to A cc.
(Insert a hose into the discharge pipe or oil equalization pipe of the new compressor and inject (A-1900)
[cc] of oil using a funnel, etc.)
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