Mitsubishi Electric PCA-RP71HA PCA-RP71HA Service Manual page 22

9-5. HOW TO CHECK THE PARTS
PCA-RP71HA
PCA-RP125HA
Parts name
Room temperature Disconnect the connector then measure the resistance using a tester.
thermistor (TH1)
(Surrounding temperature 10:~30:)
Pipe temperature
thermistor (TH2)
Condenser/Evaporator
temperature thermistor
(TH5)
Fan motor Measure the resistance between the terminals using a tester.
(Winding temperature 20:)
Relay
Protector connector
White
Orange
Red
Yellow
Blue
Protector
Black
OPEN : 135i5:
CLOSE : 95i15:
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15kΩ ± 3%
0
Fixed number of B=3480kΩ ± 2%
Rt=15exp { 3480(
273+t
0: 15kΩ
10: 9.6kΩ
20: 6.3kΩ
25: 5.4kΩ
30: 4.3kΩ
40: 3.0kΩ
Normal
4.3k"~9.6k" Open or short
Connector
PCA-RP71HA
White–Black
140.5"
Black–Blue
Blue–Yellow
Yellow–Red
Room temperature thermistor(TH1)
Pipe temperature thermistor(TH2)
Condenser/evaporator temperature
thermistor(TH5)
1
1
) }
273
Check points
Abnormal
(Refer to <Thermistor Characteristic graph> for a detail.)
Normal
PCA-RP125HA
75.6"
15.4" 36.7"
28.5" 23.6"
80.4" 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 (:)