Check; Thermistor Resistance Check - Daikin SiBE04-624_B_FTXR-E Service Manual

Check

3. Check

3.1

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.
134
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 humidity sensor PCB,
disconnect the connector of humidity sensor PCB from the control PCB to measure the
resistance.
When the connector of 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
45
(˚C)
(R11905)
Tester
Room temperature
thermistor
Tester
(R11906)
Service Diagnosis
SiBE04-624_B
(R17417)