Check; Thermistor Resistance Check - Daikin 2MXS-N Series 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.
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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
SiUS121502E