Service manual

31
11-2. Trouble criterion of main parts
MUH-A18WV - MUH-A24WV - MUH-A30WV -
E1E1E1
Part name FigureCheck method and criterion
Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)
Compressor
(MC)
INNER
PROTECTOR
160i 5: OPEN
90i10: CLOSE
Normal
MUH-A18WV
Terminal
C – R
C – S
1.59 " ~ 1.95 "
2.65 " ~ 3.24 "
MUH-A24WV
0.71 " ~ 0.87 "
1.45 " ~ 1.77 "
MUH-A30WV
0.56 " ~ 0.71 "
1.43 " ~ 1.76 "
Abnormal
Open or
short-circuit
R.V. coil(21S4)
LEV(Expansion valve)
MUH-A30WV
Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)
Normal
2.673 k" ~ 3.268 k"
Abnormal
Open or short-circuit
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Abnormal
Open or
short-circuit
Normal
30.3 " ~ 37.0 "
Measure the resistance with a tester.
(Part temperature : –10˚C ~ 40˚C)
Measure the resistance with a tester.
(Part temperature –10˚C ~ 40˚C)
Discharge temperature
thermistor(RT62)
MUH-A30WV
Ambient temperature
thermistor(RT63)
MUH-A30WV
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
(Part temperature 0˚C ~ 40˚C)
Normal
120 k" ~ 800k"
Abnormal
Open or short-circuit
Normal
5 k" ~ 60 k"
Abnormal
Open or short-circuit
Measure the resistance with a tester.
(Part temperature –10˚C ~ 40˚C)
Normal
5 k" ~ 60 k"
Abnormal
Open or short-circuit
Defrost thermistor
(RT61)
w Reference value
MUH-A18WV MUH-A24WV MUH-A30WV
Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)
Color of
lead wire
WHT – BLK
BLK – RED
BLK – YLW
YLW – RED
Open or
short-circuit
102 " ~ 126 "
97 " ~ 120 "
–
–
55 " ~ 68 "
–
26 " ~ 33 "
55 " ~ 68 "
55.4 " ~ 67.7 "
–
49.3 " ~ 60.3 "
22.9 " ~ 28.0 "
Normal
Abnormal
Outdoor fan motor(MF)
MUH-A18/A24WV
INNER
PROTECTOR
145i 8: OPEN
( 88i15: CLOSE
w
)
MUH-A30WV
INNER
PROTECTOR
135i 5: OPEN
( 83i15: CLOSE
w
)
REDORN WHT
YLW
BLK
MAIN
AUX.1AUX.2
C
P
P
~
BLK
R
MAIN
AUX
RED
S
C
WHT
MAIN
AUX
BLK
MUH-A18WV
MUH-A24WV
MUH-A30WV
RED
WHTORN
P
P
C
RED
ORN WHT
YLW
BLK
MAIN
AUX.1 AUX.2
LEV
WHT
6
RED1
ORN4
YLW5
BRN2
BLU3
:INNER PROTECTOR
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