Mitsubishi Electric MUH-GA50VB-E1 Service Manual page 27

10-3. Trouble criterion of main parts
MUH-GA50VB MUH-GA60VB MUH-GA80VB
Part name
Defrost thermistor
(RT61)
Discharge temperature
thermistor(RT62)
MUH-GA80VB
Ambient temperature
thermistor(RT63)
MUH-GA80VB
Compressor
(MC)
INNER
PROTECTOR
160i 5: OPEN
90i10: CLOSE
Outdoor fan motor(MF)
MUH-GA50VB
MUH-GA60VB
INNER
PROTECTOR
130i 5: OPEN
w
( 83i15: CLOSE )
MUH-GA80VB
INNER
PROTECTOR
135i 5: OPEN
w
( 83i15: CLOSE )
R.V. coil(21S4)
LEV(Expansion valve)
MUH-GA80VB
w Reference value
Check method and criterion
Measure the resistance with a tester.
(Part temperature –10˚C ~ 40˚C)
Refer to 10-5. "Test point diagram and voltage", "Outdoor deicer P.C. board",
the chart of thermistor.
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 10-5. "Test point diagram and voltage", "Outdoor deicer P.C. board",
the chart of thermistor.
Measure the resistance with a tester.
(Part temperature –10˚C ~ 40˚C)
Refer to 10-5. "Test point diagram and voltage", "Outdoor deicer P.C. board",
the chart of thermistor.
Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)
Terminal
MUH-GA50VB
C – R 1.59 " ~ 1.95 "
2.65 " ~ 3.24 "
C – S
Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)
Color of
lead wire
MUH-GA50VB-
70.4 " ~ 85.5 "
WHT – BLK
BLK – RED 73.6 " ~ 89.3 "
–
BLK – YLW
–
YLW – RED
Measure the resistance between the terminals with a tester.
(Part temperature –10˚C ~ 40˚C)
Normal
2.673 k" ~ 3.268 k"
Measure the resistance with a tester.
(Part temperature : –10˚C ~ 40˚C)
Color of lead wire
WHT – RED
RED – ORN
41.0 " ~ 49.0 "
YLW – BRN
BRN – BLU
Normal
MUH-GA60VB MUH-GA80VB
0.71 " ~ 0.87 " 0.56 " ~ 0.71 "
1.45 " ~ 1.77 " 1.43 " ~ 1.76 "
Normal
MUH-GA50VB- MUH-GA60VB MUH-GA80VB
E1 E2
63.1 " ~ 76.6 " 61.0 " ~ 74.0 "
79.1 " ~ 96.1 " 82.5 " ~ 100.2 "
– –
– –
Normal
27
Figure
WHT
C
P
AUX.
S
RED
MUH-GA50VB
MUH-GA60VB
AUX.
P
BLK
MUH-GA80VB
55.4 " ~ 67.7 "
–
49.3 " ~ 60.3 "
AUX.1 AUX.2
22.9 " ~ 28.0 "
BLK YLW
6
WHT
1
RED
4
ORN
P :INNER PROTECTOR
~
MAIN
R
BLK
MAIN
RED ORN WHT
MAIN
P
C
RED ORN WHT
LEV