Mitsubishi Electric Mr. SLIM PCA-M71HA2 Service Manual page 19

9-6. HOW TO CHECK THE PARTS
Parts name
Room temperature Disconnect the connector then measure the resistance with a multimeter.
thermistor (TH1)
(At the ambient temperature 10 to 30°C)
Pipe temperature
thermistor/liquid (TH2)
Refer to the <Thermistor Characteristic Graph> below.
Condenser/evaporator
temperature thermistor
(TH5)
(MF)
Fan motor Measure the resistance between the terminals with a multimeter.
(Winding temperature 20°C)
Relay
connector
Protector
White
Orange
Red
Yellow
Blue
Protector
OPEN: 135±5°C
Black
CLOSE: 95±15°C
<Thermistor Characteristic Graph>
Thermistors for
lower temperature
Thermistor R =15 kΩ ± 3%
0
Fixed number of B=3480 kΩ ± 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
OCH753A
Connector Normal
White–Black 140.5 Ω
Black–Blue 15.4 Ω
Blue–Yellow 28.5 Ω
80.4 Ω
Yellow–Red
Room temperature thermistor(TH1)
Pipe temperature thermistor/ liquid (TH2)
Condenser/evaporator temperature
thermistor(TH5)
1
) }
273
Checkpoints
50
40
30
20
10
0
19
< Thermistor for lower temperature >
-20 -10 0 10 20 30 40 50
Temperature (°C)