Mitsubishi Electric PKA Series Service Manual page 22

9-6. HOW TO CHECK THE PARTS
PKA-RP35HAL
Parts name
Room temperature Disconnect the connector then measure the resistance using a tester.
thermistor (TH1)
(At the ambient temperature 10 ~30 )
Liquid pipe temperature
thermistor (TH2)
Condenser / Evaporator
temperature thermistor
(TH5)
Vane motor (MV) Measure the resistance between the terminals using a tester. (Coil temperature 25 )
Red
M
Yellow
Brown-Red
Brown
Orange Green
Connect pin No.
Fan motor (MF)
Refer to 9-6-2.
9-6-1. Thermistor
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k' ± 3%
0
Fixed number of B=3480 ± 2%
Rt=15exp { 3480(
273+t
0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.4k'
30: 4.3k'
40: 3.0k'
PKA-RP50HAL
Normal Abnormal
4.3k ~9.6k Open or short
Normal
- -
Brown-Orange Brown-Yellow
350 ± 7%
Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)
Condenser/evaporator temperature ther-
mistor (TH5)
1 1
) }
273
Check points
Refer to the thermistor.
Abnormal
- -
Brown-Green
Open or short
22
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature ( )