Check; Thermistor Resistance Check - Daikin CTXS07LVJU Service Manual

Check

8. Check

8.1

Thermistor Resistance Check

Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each
thermistor using multimeter.
164
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 soldered on a PCB, remove the PCB from the control
PCB to measure the resistance.
When the connector of indoor heat exchanger thermistor is soldered on a PCB, remove the
thermistor and measure the resistance.
Resistance (kΩ)
°F
–4 197.8
5 148.2
14 112.1
23 85.60
32 65.93
41 51.14
50 39.99
59 31.52
68 25.02
77 20.00
86 16.10
95 13.04
104 10.62
113 8.707
122 7.176
(R25°C (77°F) = 20 kΩ, B = 3950 K)
–15 0 15 30 45
5 32 59 86 113
Multimeter
Resistance range
(˚C)
(˚F)
(R14467)
Room temperature
thermistor
Multimeter
(R19752)
(R19751)
Service Diagnosis
SiUS121602E