Daikin FTK24NMVJU - Part 7 Trial Operation and Field Settings

Check SiUS041501E
91 Service Diagnosis
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 multimeter.

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.
Thermistor temperature Resistance (kΩ)
°C °F
Room temperature
thermistor
Other thermistors
–20 –4 73.4 197.8
–15 5 57.0 148.2
–10 14 44.7 112.1
–5 23 35.3 85.60
0 32 28.2 65.93
5 41 22.6 51.14
10 50 18.3 39.99
15 59 14.8 31.52
20 68 12.1 25.02
25 77 10.0 20.00
30 86 8.2 16.10
35 95 6.9 13.04
40 104 5.8 10.62
45 113 4.9 8.707
50 122 4.1 7.176
(R25°C (77°F) = 10 kΩ,
B = 3435 K)
(R25°C (77°F) = 20 kΩ,
B = 3950 K)
Room temperature thermistor
(˚C)
(˚F)
50
25
0
–15
5 32 59 86 113
0
15 30
45
(kΩ)
(R21673)
Other thermistors
(˚C)
(kΩ)
–15
0
15 30
45
150
100
50
(˚F)
5 32 59 86 113
Multimeter
Resistance range
(R19751)
Multimeter
(R20505)
Room temperature
thermistor