258
[When replacing normal as well as faulty compressors] - applicable to MMY-MAP1404
#
and 1604
#
<Dismantling normal compressors>
• Dismantle the normal compressors in the same way as the faulty compressor.
Note:
• Be sure to insulate the removed compressor leads using insulation tape, etc.
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 [cc] = (Weight of compressor as it was dismantled (kg) - 22.7) × 1042
(Specific volume of oil: 1042 [cc/kg])
Note:
• When a compressor is empty, it weighs 22.7kg.
<Adjusting amount of oil in new compressors>
• Perform the adjustment on the basis of how much oil the faulty compressor contained, A [cc], and how much oil
the normal compressors contained, B and C [cc], by following the steps below.
1
Combined amount of oil in faulty compressor and two normal compressors A+B+C [cc]: 0
A+B+C < 3000
(1) Adjust the amount of oil in the three new compressors to 1000cc each (total 3000cc).
• Lay the compressors down and draw 900 [cc] of oil from each of them via their oil equalization pipes.
Notes:
• Do not draw more than 900 [cc] of oil from a compressor as it may cause damage.
• 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
Combined amount of oil in faulty compressor and two normal
compressors A+B+C [cc]: 3000 A+B+C < 5700
(1) Adjust the amount of oil in the three new compressors to (A+B+C)/3 cc each.
• Lay the compressors down and draw [5700-(A+B+C)]/3 [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 [cc]: 5700 A+B+C
(1) Adjust the amount of oil in the three new compressors to (A+B+C)/3 cc each.
(Insert a hose into the discharge pipe or oil equalization pipe of each
compressor and inject (A+B+C)/3-1900 [cc] of oil using a funnel, etc.)
Compressor
