Service manual

3 – 8
500k
400k
300k
200k
100k
0
-20 0 20 60 80 100 120
3.06k
5.78k
2.28k
1.72k
40k
30k
20k
10k
0
-20 0 20 60
40
TH1 compressor thermistor
(CN8A 1 - 2 )
TH2 - TH4
TH6 - TH9
Temperature ( )
Temperature ( )
Thermistor ColorNo. Connector
Compressor thermistor
Heat exchanger pipe thermistor
Connector pin
Outdoor temp. thermistor
TH1
TH2
TH3
CN8A
CN8A
Red
No. 1 to 2
No. 3 to 4
No. 5 to 6
No. 7 to 8
No. 1 to 2
No. 3 to 4
No. 5 to 6
Orange
Suction thermistor
TH4
CN8A
Black
Thermistor unit A (suction)
TH6
CN8C
Blue
Thermistor unit B (suction)
TH7
CN8C
White
Thermistor unit C (suction)
TH8
CN8C
Brown
No. 7 to 8
Thermistor unit D (suction)
TH9
CN8C
Yellow
CN8A
Green
25
resistance
45 k
Resistance ( )
Resistance ( )
0
resistance
14.5 k
25
͠ resistance
4.431 k
To measure the resistance, first remove the connector from the board.
4.17k
500
400
300
200
100
0
-20 0 20 40
Temperature (
͠
)
80 100
3.25k
60
12.3k
6.14k
Resistance (k )
Thermistor
Heatsink
Color
Black
To measure the resistance, first remove
the connector as shown at right.
Signal
CN8B
Heatsink thermistor
TH5 (black)
25
͠ resistance 50k
Tester
1
3
Figure 3 Temperature properties of heatsink thermistor
Figure 2 Temperature properties of outdoor thermistors
Connector
CN8A
Connector
CN8C
18
TH2 : Heat exchanger pipe thermistor (CN8A 3 - 4 )
TH3 : Outdoor temp. thermistor (CN8A 5 - 6 )
TH4 : Suction thermistor (CN8A 7 - 8 )
TH6 : Thermistor unit A (CN8C 1 - 2 )
TH7 : Thermistor unit B (CN8C 3 - 4 )
TH8 : Thermistor unit C (CN8C 5 - 6 )
TH9 : Thermistor unit D (CN8C 7 - 8 )
18
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