Check; Thermistor Resistance Check - Daikin SUPER MULTI NX CTXS07JVJU Service Manual

Check

7. Check

7.1

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.
 The room temperature thermistor is directly mounted on the display PCB. Remove the display
 When the indoor heat exchanger thermistor is soldered on the PCB, remove the thermistor and
191
The data is for reference purpose only.
Temperature (°F/°C )
–4 / –20
5 / –15
14 / –10
23 / –5
32 / 0
41 / 5
50 / 10
59 / 15
68 / 20
77 / 25
86 / 30
95 / 35
104 / 40
113 / 45
122 / 50
(kW)
150
100
PCB from the control PCB to measure the resistance.
measure the resistance.
Resistance (k)
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
(R 77°F (25°C) = 20 k, B = 3950 K)
50
86
32
5 59
–15 0
15 30
Resistance range
(°F)
113
45
(°C)
Room temperature
Tester
thermistor
Tester
(R11906)
Service Diagnosis
SiUS12-928_B
(R17417)