25
9-3. Trouble criterion of main parts
MU-GA50VB -
MU-GA60VB -
MU-GA80VB -
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
MU-GA50VB
Terminal
C – R
C – S
1.59
"
~ 1.95
"
2.65
"
~ 3.24
"
MU-GA60VB
0.71
"
~ 0.87
"
1.45
"
~ 1.77
"
MU-GA80VB
0.56
"
~ 0.71
"
1.43
"
~ 1.76
"
Abnormal
Open or
short-circuit
LEV(Expansion valve)
MU-GA80VB
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Abnormal
Open or
short-circuit
Normal
41.0
"
~ 49.0
"
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)
MU-GA80VB
Ambient temperature
thermistor(RT63)
MU-GA80VB
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
w
Reference value
MU-GA50VB
MU-GA60VB
MU-GA80VB
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
70.4
"
~ 85.5
"
73.6
"
~ 89.3
"
–
–
63
"
~ 77
"
79
"
~ 96
"
–
–
55
"
~ 68
"
–
49
"
~ 61
"
22
"
~ 29
"
Normal
Abnormal
Outdoor fan motor(MF)
INNER
PROTECTOR
MU-GA50VB
MU-GA60VB
130
i
5
:
OPEN
( 83
i
15
:
CLOSE
w
)
MU-GA80VB
135
i
5
:
OPEN
( 87
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
MU-GA50VB/GA60VB
MU-GA80VB
RED
WHT
ORN
P
LEV
WHT
6
RED
1
ORN
4
YL
W
5
BRN
2
BLU
3
:INNER PROTECTOR
P
OB370-1.qxp 04.10.14 1:45 PM Page 25
