Mitsubishi Electric MS-18NN Series Service Manual page 26

MS-18NN- , MS-24NN-
S 1
10-2-2 Trouble criterion of main parts
Part name
Room
Measure the resistance with a tester.
temperature
(Part temperature 10°C ~ 30°C)
thermistor
Indoor coil
thermistor
Measure the resistance between the terminals with a tester.
(Coil wiring temperature-10°C ~ 40°C)
Compressor
Measure the resistance between the terminals with a tester.
(Coil wiring temperature10°C ~ 30°C)
Indoor fan
motor
Measure the voltage Power ON.
Measure the resistance between the terminals with a tester.
(Coil wiring temperature-10°C ~ 40°C)
Outdoor fan
motor
WHT-BLK
BLK-RED
BLK-YLW
Vane motor
26
S 1
Check method and criterion
Normal
8kΩ ~ 20kΩ
18NN
C-R
0.88~1.08Ω
C-S
1.73~2.12Ω
WHT-BLK
BLK-RED
Normal
BRN-YLW
4.5 ~ 5.5V
(When fan revolved one time)
YLW-GRY
0V 5V 0V
(Approx.)
18NN
102 ~ 126Ω
98 ~ 120Ω
-
Measure the resistance between the terminals with a tester.
(Part temperature10°C ~ 30°C)
Normal
Opened or short-circuited
358 ~ 387Ω
Abnormal
Opened or short-circuited
Normal
24NN
0.73~0.90Ω
1.61~1.97Ω
Normal
Ω
116 ~ 126
Ω
159 ~ 172
Abnormal
Remain 0V or 5V
Normal
24NN
71.5 ~ 87.5Ω
90.1 ~ 110.2Ω
80.8 ~ 99.4Ω
Abnormal
Abnormal
Opened or
short-circuited
Abnormal
Opened or
short-circuited
18NN
Abnormal
24NN
Opened or
short-circuited
Figure
P
P