Check; Thermistor Resistance Check - Daikin FTXG-J Service Manual

Check

5. Check

5.1

Thermistor Resistance Check

Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of
each thermistor using tester.
The relationship between normal temperature and resistance is shown in the table and the
graph below.
110
The data is for reference purpose only.
Thermistor temperature (°C)
–20
–15
–10
–5
0
5
10
15
20
25
30
35
40
45
50
(kΩ)
150
100
50
When the room temperature thermistor is directly mounted on the display PCB, remove the
display PCB from the control PCB to measure the resistance.
When the connector of the indoor heat exchanger thermistor is soldered on the PCB,
remove the thermistor and measure the resistance.
Resistance (kΩ)
197.8
148.2
112.1
85.60
65.93
51.14
39.99
31.52
25.02
20.00
16.10
13.04
10.62
8.707
7.176
(R25°C = 20 kΩ, B = 3950 K)
–15 0 15 30
Resistance range
SiBE041012_B
45
(˚C)
(R11905)
Tester
Room temperature
thermistor
Tester
(R11906)
Service Diagnosis
(R17417)