Mitsubishi Electric SUZ-SM35VA, Technical & Service Manual

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OCH779
11-4. TROUBLE CRITERION OF MAIN PARTS
Parts name
Figure
Check method and criterion
Outdoor fan motor
R.V. coil (21S4)
Expansion valve coil
(LEV)
Measure the resistance between terminals with a tester.
(Temperature: − 10 to 40°C)
WH - BK
BK - RD
RD - WH
Normal
Measure the resistance between terminals with a tester.
(Temperature: − 10 to 40°C)
Normal
Measure the resistance with a tester.
Refer to “11-6. Test point diagram and voltage”, 11-6-1. (SM35/50) or
11-6-2. (SM60) “Inverter P.C. board”, for the chart of thermistor.
Color of the lead wire
Discharge temperature
thermistor (RT62)
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to “11-6. Test point diagram and voltage”, 11-6-1. (SM35/50) or
11-6-2. (SM60) “Inverter P.C. board”, for the chart of thermistor.
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
32 to 43 Ω
Measure the resistance between terminals with a tester.
(Temperature: − 10 to 40°C)
Compressor
U-V
U-W
V-W
Normal
W
U
V
WH
RD BK
W
U
V
WH RD BK
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor(RT68)
SUZ-SM35
1.60 to 2.17 Ω
1.41 to 2.00 k Ω
SUZ-SM50/60
0.82 to 1.11 Ω
SUZ-SM35 SUZ-SM50
15 to 20 Ω
LEV
WH
RD
YE
OG
BU
Measure the resistance with a tester.
(Temperature: − 10 to 40°C)
RD - OG
RD - WH
RD - BU
RD - YE
Normal
37 to 54 Ω
Color of the lead wire
SUZ-SM60
25 to 34 Ω
1.17 to 1.66 k Ω
SUZ-SM35/50 SUZ-SM60