31
11-2. Trouble criterion of main parts
MUH-A18WV -
MUH-A24WV -
MUH-A30WV -
E1
E1
E1
Part name
Figure
Check method and criterion
Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)
Compressor
(MC)
INNER
PROTECTOR
160
i
5
:
OPEN
90
i
10
:
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
145
i
8
:
OPEN
( 88
i
15
:
CLOSE
w
)
MUH-A30WV
INNER
PROTECTOR
135
i
5
:
OPEN
( 83
i
15
:
CLOSE
w
)
RED ORN WHT
YLW
BLK
MAIN
AUX.1 AUX.2
C
P
P
~
BLK
R
MAIN
AUX
RED
S
C
WHT
MAIN
AUX
BLK
MUH-A18WV
MUH-A24WV
MUH-A30WV
RED
WHT
ORN
P
P
C
RED ORN WHT
YLW
BLK
MAIN
AUX.1 AUX.2
LEV
WHT
6
RED
1
ORN
4
YL
W
5
BRN
2
BLU
3
:INNER PROTECTOR
P
OB322-2.qxp 03.11.13 4:08 PM Page 31
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