Mitsubishi Electric Mr.SLIM PKA-A12HA4 Service Manual page 22

9-6. HOW TO CHECK THE PARTS
PKA-A12HA4 PKA-A18HA4
Parts name
Room temperature
Disconnect the connector then measure the resistance with a tester.
thermistor (TH1)
(At the ambient temperature 50 F~86 F)
Liquid pipe thermistor
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Vane motor (MV)
Measure the resistance between the terminals with a tester. (Coil temperature 77
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
0
Fixed number of B=3480 ± 2%
t( )Rt=15exp { 3480(
0
10
20
25
30
40
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
thermistor (TH5)
± 3%
1 1
) }
273+t 273
1 1
T-32
273+ 273
1.8
Check points
(Refer to the next page for a detail.)
Abnormal
- -
Brown-Green
Open or short
<Thermistor for lower temperature>
50
40
30
20
10
0
22
F
)
-20 -10 0 10 20 30 40 50
-4 -14 32 50 68 86 104122 °F
Temperature
°C