Mitsubishi Electric PCA-RP71HAQ Service Manual page 22

9-5. HOW TO CHECK THE PARTS
PCA-RP71HAQ
Parts name
Room temperature Disconnect the connector then measure the resistance with a tester.
thermistor (TH1)
(At the ambient temperature 10 ~30 )
Pipe temperature
thermistor (TH2)
Condenser/Evaporator
temperature thermistor
(TH5)
(MF) Measure the resistance between the terminals with a tester.
Fan motor
(Winding temperature 20 )
Relay
Protector connector
White
Orange
Red
Yellow
Blue
Protector
Black
OPEN : 135±5
CLOSE : 95±15
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15kΩ ± 3%
0
Fixed number of B=3480kΩ ± 2%
1
Rt=15exp { 3480(
273+t
0: 15kΩ
10: 9.6kΩ
20: 6.3kΩ
25: 5.4kΩ
30: 4.3kΩ
40: 3.0kΩ
PCA-RP125HAQ
Normal
4.3k ~9.6k Open or short
Connector
PCA-RP71
White–Black
140.5
Black–Blue
15.4
Blue–Yellow
28.5
Yellow–Red
80.4
Room temperature thermistor(TH1)
Pipe temperature thermistor(TH2)
Condenser/evaporator temperature
thermistor(TH5)
1
) }
273
Check points
Abnormal
(Refer to <Thermistor Characteristic graph> for a detail.)
Normal
PCA-RP125
75.6
36.7
23.6
47.8
22
Abnormal
Open or short
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature ( )