Thermistor Temperature Characteristics - IVT 12KHR-N Service Manual

[3] THERMISTOR TEMPERATURE CHARACTERISTICS

1. Indoor unit thermistor temperature characteristics
Figure 1 Temperature properties of indoor thermistors
Thermistor
Room temperature
Heat exchange
To measure the resistance, first remove
k
the soldering as shown at right.
100
80
60
40
20
0
-10 0
2. Outdoor unit thermistor temperature characteristics
Resistance
(K )
Signal
TH1
TH2
Heat exchange thermistor
TH2 (Orange),
25ºC resistance 4.431 k
Room temperature
thermistor TH1 (Yellow)
25ºC resistance 10 k
10 20
Connector
CN8
500K
400K
300K
Resistance at 25
52.76 k
200K
5.8K
100K
0
-20 0 20 60 80
Temperature(
TH1 Compressor thermistor
Thermistor
Compressor thermistor
Heat exchanger thermistor
Outdoor air temperature thermistor
Suction thermistor
2-way valve thermistor
Room temperature
Color
thermistor TH1 (CN10 1 - 3 )
Yellow
Heat exchange
Orange
thermistor TH2 (CN11 1 - 2 )
CN10
30 40
1 10
+ -
40K
Tester
Resistance at 0
Resistance
30K 14.57 k
(K )
20K
3.06K
10K
4.17K 2.28K
1.72K
0
100 120 -20
)
TH2 Heat exchanger thermistor
TH3 Outdoor air temperature thermistor
TH4 Suction thermistor
TH5 2-way valve thermistor
No. Connector
TH1 No. (1) - No. (2)
TH2 No. (3) - No. (4)
TH3 No. (5) - No. (6)
TH4 No. (7) - No. (8)
TH5 No. (9) - No. (10)
3 – 5
TH1
TH2
CN11
1
3 1
Tester
Tester
Connector
CN8
1 10
+ -
Tester
(In case of TH2 heat exchanger thermistor)
Resistance at 25
4.431 k
TH2 TH5
0 20 40 60
Temperature( )
Color
Before measuring resistance,
Red
disconnect connectors from PWB.
Orange
Green
Black
Yellow
12KHR-N
2