Check; Thermistor Resistance Check - Daikin H Series Service Manual

SiUS04-924_A

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
Temperature (°C / °F)
–20 / –4
–15 / 5
–10 / 14
–5 / 23
0 / 32
5 / 41
10 / 50
15 / 59
20 / 68
25 / 77
30 / 86
35 / 95
40 / 104
45 / 113
50 / 122
For the models in which the thermistor is directly mounted on the PCB, disconnect the
connector for the PCB and measure.
Resistance (k)
211.0
150.0
116.5
88.0
67.2
51.9
40.0
31.8
25.0
20.0
16.0
13.0
10.6
8.7
7.2
(R25°C (77°F) = 20 k, B = 3950 K)
(kΩ)
150
100
50
–15 0 15 30
5 32 59 86
RTH1
Tester
(R3460)
(˚C)
45
(˚F)
113
(R14467)
Tester
Resistance range
(R11906)
Service Diagnosis

Check