Check; Thermistor Resistance Check - Daikin K-Series Service Manual

SiBE061121.book Page 119 Monday, April 25, 2011 3:21 PM
SiBE061121

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.
Service Diagnosis
Thermistor temperature (°C)
–20
–15
–10
–5
0
5
10
15
20
25
30
35
40
45
50
(kΩ)
150
100
50
-15
For the models in which the thermistor is directly mounted on the PCB, disconnect the
connector for the PCB and measure.
Resistance (kΩ)
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 = 20 kΩ, B = 3950 K)
0 15 30 45
(˚C)
(R11905)
Tester
Resistance range
RTH1
Tester
(R3460)

Check

(R11906)
119