Thermistor Temperature Characteristics - IVT 09LR-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
Heat exchange thermistor
TH2 (Orange),
25ºC resistance 4.431 k
60
40
20
0
-10 0
2. Outdoor unit thermistor temperature characteristics
500K
400K
Resistance
(K )
300K
200K
100K
0
Compressor thermistor
Heat exchanger thermistor
Outdoor air temperature thermistor
Suction thermistor
2-way valve thermistor
Signal
TH1
TH2
Room temperature
thermistor TH1 (Yellow)
25ºC resistance 10 k
10 20 30
Connector
CN8
1
+ -
Tester
Resistance at 25
52.76 k
5.8K 3.06K
4.17K 2.28K
1.72K
-20 0 20 60 80 100 120
Temperature( )
TH1 Compressor thermistor
Thermistor No.
TH1
TH2
TH3
TH4
TH5
Room temperature
Color
Yellow
thermistor TH1 (CN8 3 - 4 )
Orange
Heat exchange
thermistor TH2 (CN8 1 - 2 )
TH2
1 2
Tester
40
Connector
CN8
10 1
40K
Resistance at 0
Resistance
(In case of TH2 heat exchanger thermistor)
30K 14.57 k
(K )
Resistance at 25
4.431 k
20K
TH2
10K
0
-20 0 20 40
Temperature(
TH2 Heat exchanger thermistor
TH3 Outdoor air temperature thermistor
TH4 Suction thermistor
TH5 2-way valve thermistor
Connector Color
Before measuring resistance,
No. (1) - No. (2) Red
disconnect connectors from PWB.
No. (3) - No. (4) Orange
No. (5) - No. (6) Green
No. (7) - No. (8) Black
No. (9) - No. (10) Yellow
3 – 5
TH1
4
3
Tester
10
+ -
Tester
TH5
60
)
12LRN