Mitsubishi Electric Mr.SLIM PCA-RP50KAQ Service Manual page 28

9-6. HOW TO CHECK THE PARTS
PCA-RP50KAQ
PCA-RP100KAQ
Parts name
Room temperature Disconnect the connector then measure the resistance with a tester.
thermistor (TH1) (At the ambient temperature of 10°C~30°C)
Liquid pipe thermistor
(TH2)
Condenser/evaporator
temperature thermistor (TH5)
Vane motor (MV) Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20°C~30°C
White
Orange
Red
Yellow
Blue
Drain pump (DP)
Measure the resistance between the terminals with a tester.
(Option) (Winding temperature 20°C)
1
3
Drain float switch (FS)
Measure the resistance between the terminals with a tester.
Moving part
State of moving part
1
2
3
4
(Option)
9-6-1. Thermistor
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k' ± 3%
0
Fixed number of B=3480 ± 2%
1
Rt=15exp { 3480(
273+t
0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.4k'
30: 4.3k'
40: 3.0k'
PCA-RP60KAQ
PCA-RP125KAQ
Normal
4.3kΩ~9.6kΩ Open or short
Normal
Connector
Red - Yellow
Red - Blue
Red - Orange
Red - White
Normal
290Ω Open or short
Normal
UP Short
DOWN Open
Room temperature thermistor(TH1)
Pipe temperature thermistor/liquid(TH2)
Condenser/evaporator temperature
thermistor(TH5)
1
) }
273
PCA-RP71KAQ
PCA-RP140KAQ
Check points
Abnormal
(Refer to Thermistor characteristic graph.)
Abnormal
Open or short
300Ω
Abnormal
Abnormal
Other than short
Other than open
28
Switch
Magnet
Moving part
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature ( )