Replacement Of Compressors - Carrier MMY-MAP0724FT9UL Service Manual

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> (0.502gal (1900cc) 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 < 0.264gal (1000cc)
(1) Adjust the amount of oil in the new compressor to 0.264gal (1000cc).
(Lay the new compressor down and draw 0.238gal (900cc) of oil via the oil-equalization pipe.)
Notes:
• Do not draw more than 0.238gal (900cc) of oil as it may cause damage to the compressor.
• If the faulty compressor contained 0.132gal (500cc) 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)]: 0.264gal (1000cc) ≤ ≤ ≤ ≤ ≤ A < 0.502gal (1900cc)
(1) Adjust the amount of oil in the new compressor to A gal (cc).
(Lay the new compressor down and draw (0.502gal (1900cc) - A) [gal (cc)] of oil via the oil equalization
pipe.)
3
Amount of oil in faulty compressor A [gal (cc)]: 0.502gal (1900cc) ≤ ≤ ≤ ≤ ≤ 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-0.502gal
(1900cc)) of oil using a funnel, etc.)
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