III - 56
Service Procedures
3
SM830063
8. Compressor Failure
8-1. Trouble shooting and method for checking the compressor
Generally, compressor failures are classified into the following items.
(1)
Mechanical trouble
1
Locking (dust, scoring, etc.)
2
Pressure shortage (damaged parts such as valves, tools, spare rings, etc.)
3
Abnormal sound (damaged parts such as status rotor, valves, etc.)
(2)
Electrical trouble
1
Burnt coil
2
Cutoff wire
3
Insulation failure
4
Ground fault
Failure is determined by the coil resistance value (which differs depending on the compressor), insulation resistance
value, current value, activation of earth leakage breaker, contamination of oil and refrigerant, smell, pressure, noise, etc.
on the basis of the remote controller displays such as "H01", "H02" (in case of a power control compressor) and "H11",
"H12" (in case of a standard compressor).
Reference note: Insulation resistance value (the insulation resistance between the live part and the non-live part is
measured using a DC 500V insulation resistance tester.)
a
Motor
300 M ohms or more
b
Compressor
100 M ohms (service part) or more
c
Outdoor unit.
10 M ohms or more (This is due to refrigerant. Refrigerant decreases the insulation
resistance value.)
8-2. Judgment of 2 compressors replacement
* 1. Judgment with resistance value
See the winding resistance in the product specifica-
tions.
* 2. Loosen the oil balancing pipe flare nut section and
remove.
If the motor is burnt out , be sure to clean the inside of
the refrigerant tubing.
Reference note: Example of a burnt motor
(1)
Ground fault: Actuation of earth leakage breaker.
(2)
Ground fault: Coil resistance between phases varies.
(3)
Cutoff wire.
*Short-circuiting between phases leads to severe trouble.
Motor burnt out
Remove the oil for color
check.
Judgment of compressor
breakdown
Replacement of one
broken compressor
Replacement of two
broken compressors
Compressor delivery
Replacement
(See the “Operation procedure
for replacing the compressor”.)
0331_M_I
Yes
No
*1
*2
Yes (4 or more)
No (Under 4)
Color check
4
[
*ASTM COLOR
*American Standard Testing Method
NOTE
1249_M_I
R
S
T
