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1. Compressors
Compressor trouble can generally be grouped under the following categories:
Mechanical trouble → (A) Compressor lock-up
1
2
Electrical trouble
Troubleshooting consists in pinpointing the trouble from the winding resistance (which differs depending on the
7
compressor concerned), insulation resistance, current, leakage circuit breaker tripping, extent to which the oil and
refrigerant have become contaminated, abnormal smells, pressure, noise and other factors on the basis of the H01
and H02 (PC comp), H11 and H12 (AC comp), H21 and H22 (SC comp) remote control displays.
Remarks: Insulation resistance (measure the insulation resistance of the live parts and non-live parts using a DC
500V megger)
(a) Fan motor → 300 Ω or more
(b) compressor → 100 Ω or more (item supplied for servicing)
(c) unit
1-1. Judging whether a compressor needs to be replaced
Start
Is the motor in the failed
compressor burnt out?
Yes
Drain off the oil inside all
the compressors in the
same system.
ASTM No. 4 or above
(Oil color)?
Pungent smell?
No
(B) Trouble in boosting pressure
(C) Abnormal noises
→ (A) Winding burn-out
(B) Broken or disconnected wires
(C) Defective insulation
(D) Ground faults
→ 10 Ω or more (this is measured because the unit contains refrigerant which reduces the
insulation resistance)
No
Drain off the oil inside the compressor.
Two or more units incorporating
Yes
compressors with ASTM No. 4
or above(Oil color)?
No
Is the unit that incorporates a
compressor with ASTM No. 4
or above(Oil color) the PC unit?
No Two or more with ASTM No. 4
Replace only
failed compressor.
Ref. to item 1-2.
Yes
Yes
or above in the PC unit?
Yes
Replace (all 3)
Replace all
compressors
compressors in
in PC unit.
same system.
Ref. to item 1-5.
Ref. to item 1-6.
VII - 2
Replacement of Main Units
Yes ASTM No. 4 or above
(Oil color)?
Pungent smell?
No
Replace only
failed compressor.
Ref. to item 1-2.
1867_M_I
TD831077
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