Mitsubishi Electric MR. SLIM PCA Series Service Manual page 37

9-6. HOW TO CHECK THE PARTS
PCA-M35KA
PCA-M35KA-ER
PCA-M100KA
PCA-M100KA-ER
Parts name
Room temperature
thermistor (TH1)
Pipe temperature
thermistor/liquid(TH2)
Condenser/evaporator
temperature thermistor (TH5)
Vane motor (MV)
WH
MV
OG
RD
YE
BU
Drain pump (DP)
(Option)
1
3
Drain float switch (FS)
Moving part
1
2
3
4
(Option)
9-6-1. Thermistor
<Thermistor Characteristic Graph>
Room temperature thermistor(TH1)
Thermistor for
Pipe temperature thermistor/liquid(TH2)
lower temperature
Condenser/evaporator temperature
thermistor(TH5)
Thermistor R =15kΩ ± 3%
0
Fixed number of B=3480 ± 2%
1
Rt=15exp { 3480(
273+t
0˚C 15 kΩ
10˚C 9.6 kΩ
20˚C 6.3 kΩ
25˚C 5.4 kΩ
30˚C 4.3 kΩ
40˚C 3.0 kΩ
OCH659A
PCA-M50KA
PCA-M50KA-ER
PCA-M125KA
PCA-M125KA-ER
Disconnect the connector then measure the resistance with a tester.
Refer to "9-6-1. Thermistor".
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20 to 30°C
Connector
Red - Yellow
Red - Blue
300Ω ± 7 % (at 25 °C )
Red - Orange
Red - White
Measure the resistance between the terminals with a tester.
(Winding temperature 20°C)
Normal Abnormal
290Ω Open or short
Measure the resistance between the terminals with a tester.
State of moving part
UP
DOWN
1
) }
273
PCA-M60KA
PCA-M60KA-ER
PCA-M140KA
PCA-M140KA-ER
Check points
Normal
Normal
Short
Open
37
PCA-M71KA
PCA-M71KA-ER
Switch
Magnet
Moving part
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature (:)