14
8-3. Trouble criterion of main parts
MU-A18ND MU-A24ND MU-A30ND
Part name
Figure
Check method and criterion
Measure the resistance between the terminals with a tester.
(Coil wiring temperature -10
°
C ~ 40
°
C)
Compressor
(MC)
INNER
PROTECTOR
155
i
5
:
OPEN
90
i
10
:
CLOSE
Normal
MU-A18ND
Color of
lead wire
C – R
C – S
1.26
"
~ 1.55
"
1.81
"
~ 2.23
"
MU-A24ND
0.74
"
~ 0.91
"
1.84
"
~ 2.26
"
MU-A30ND
0.54
"
~ 0.67
"
1.23
"
~ 1.52
"
LEV(Expansion valve)
MU-A30ND
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Normal
37.4
"
~ 53.9
"
Measure the resistance with a tester.
(Part temperature : 0˚C ~ 40˚C)
Measure the resistance with a tester.
(Part temperature –10˚C ~ 40˚C)
Discharge temperature
thermistor(RT62)
MU-A30ND
Ambient temperature
thermistor(RT63)
MU-A30ND
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
(Part temperature 0˚C ~ 40˚C)
Refer to 8-5. "Test point diagram and voltage", "Outdoor deicer P.C. board",
the chart of thermistor.
Refer to 8-5. "Test point diagram and voltage", "Outdoor deicer P.C. board",
the chart of thermistor.
MU-A18ND
MU-A24ND
MU-A30ND
Measure the resistance between the terminals with a tester.
(Coil wiring temperature -10
°
C ~ 40
°
C)
Color of
lead wire
WHT – BLK
BLK – RED
BLK – YLW
YLW – RED
63
"
~ 77
"
79
"
~ 96
"
–
–
57
"
~ 70
"
58
"
~ 71
"
–
–
57
"
~ 69
"
–
29
"
~ 35
"
29
"
~ 35
"
Normal
Outdoor fan motor
(MF)
INNER
PROTECTOR
135
i
5
:
OPEN
87
i
15
:
CLOSE
Measure the resistance with a tester.
(Part temperature : –10˚C ~ 40˚C)
Solenoid valve coil
(21S2)
MU-A30ND
Normal
MU-A30ND -
S1
1,738
"
~ 2,125
"
MU-A30ND -
S2
1,230
"
~ 1,330
"
WHT
BLK
YLW RED ORN
MAIN
AUX.
MAIN
AUX.
WHT
BLK
RED
ORN
MU-A18/A24ND
MU-A30ND
RED
WHT
BLK
P
C
S
R
:INNER PROTECTOR
P
LEV
WHT
6
RED
1
ORN
4
YL
W
5
BRN
2
BLU
3
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