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12-2.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> (0.502 gal (1900 cc) at shipment)
• Perform the adjustment on the basis of how much oil the faulty compressor contained, A [gal (cc)], by following
the steps below.
1 Amount of oil in faulty compressor A [gal (cc)]: 0 A < 0.264 (1000)
(1) Adjust the amount of oil in the new compressor to 0.264 gal (1000 cc).
(Lay the new compressor down and draw 0.238 (900) [gal (cc)] of oil via the oil-equalization pipe.)
Notes:
• Do not draw more than 0.238 (900) [gal (cc)] of oil as it may cause damage to the compressor.
• If the faulty compressor contained 0.132 (500) [gal (cc)] 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”.
2 Amount of oil in faulty compressor A [gal (cc)]:
0.264 (1000) A < 0.502 (1900)
(1) Adjust the amount of oil in the new compressor to A gal (cc).
(Lay the new compressor down and draw (0.502 (1900) - A) [gal (cc)] of oil via
the oil equalization pipe.)
3 Amount of oil in faulty compressor A [gal (cc)]: 0.502 (1900) A
(1) Adjust the amount of oil in the new compressor to A gal (cc).
(Insert a hose into the discharge pipe or oil equalization pipe of the new
compressor and inject (A-0.502 (1900)) [gal (cc)] of oil using a funnel, etc.)
Oil equalization
pipe
Compressor
Compressor
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