196
[When replacing normal as well as faulty compressors] - applicable to MMY-
MAP0964HT6UL and MAP1144HT6UL
<Dismantling normal compressors>
• Dismantle the normal compressors in the same way as the faulty compressor.
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.
<Measuring amounts of oil in normal compressors>
• As was the case with the faulty compressor, measure the amount of oil contained by placing each compressor
on a scale.
Amount of oil in normal compressor: B, C [gal (cc)] = (Weight of compressor as it was dismantled (lb (kg)) - 50.0
(22.7) × 0.1249 (1042)
(Specific volume of oil: 0.1249 (1042) [gal/lb (cc/kg)])
Note:
• When a compressor is empty, it weighs 50.0 lb (22.7 kg).
<Adjusting amount of oil in new compressors>
• Perform the adjustment on the basis of how much oil the faulty compressor contained, A [gal (cc)], and how much
oil the normal compressors contained, B and C [gal (cc)], by following the steps below.
1 Combined amount of oil in faulty compressor and two normal compressors A+B+C [gal (cc)]: 0
A+B+C < 0.8 (3000)
(1) Adjust the amount of oil in the three new compressors to 0.3 (1000) gal (cc) each (total 0.8 (3000) gal (cc)).
• Lay the compressors down and draw 0.2 (900) [gal (cc)] of oil from each of them via their oil equalization pipes.
Notes:
• Do not draw more than 0.2 (900) [gal (cc)] of oil from a compressor as it may cause damage.
• If the faulty compressor contained 0.1 (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 Combined amount of oil in faulty compressor and two normal
compressors A+B+C [gal (cc)]: 0.8 (3000) A+B+C < 1.5 (5700)
(1) Adjust the amount of oil in the three new compressors to (A+B+C)/3 gal (cc)
each.
• Lay the compressors down and draw [1.5 (5700) - (A+B+C)]/3 [gal (cc)] of oil
from each of them via their oil equalization pipes.
3 Combined amount of oil in faulty compressor and two normal
compressors A+B+C [gal (cc)]: 1.5 (5700) A+B+C
(1) Adjust the amount of oil in the three new compressors to (A+B+C)/3 gal (cc)
each.
(Insert a hose into the discharge pipe or oil equalization pipe of each
compressor and inject (A+B+C)/3 - 0.5 (1900) [gal (cc)] of oil using a funnel,
etc.)
Compressor
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