Check
SiBE041525F
79
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 a 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.
The data is for reference purpose only.
Thermistor temperature (°C)
Resistance (k
Ω
)
Room temperature thermistor
Other thermistors
–20
73.4
197.8
–15
57.0
148.2
–10
44.7
112.1
–5
35.3
85.60
0
28.2
65.93
5
22.6
51.14
10
18.3
39.99
15
14.8
31.52
20
12.1
25.02
25
10.0
20.00
30
8.2
16.10
35
6.9
13.04
40
5.8
10.62
45
4.9
8.707
50
4.1
7.176
(R25°C = 10 k
Ω
, B = 3435 K)
(R25°C = 20 k
Ω
, B = 3950 K)
Room temperature thermistor
(˚C)
50
25
0
–15
0
15
30
45
(k
Ω
)
(R11952)
Other thermistors
(˚C)
(k
Ω
)
–15
0
15
30
45
150
100
50
Multimeter
Resistance range
(R19751)
Multimeter
(R20505)
Room temperature
thermistor
Summary of Contents for FTX20K2V1B
Page 12: ...SiBE041525F 1 List of Functions Part 1 List of Functions 1 Functions 2...
Page 15: ...SiBE041525F Specifications 4 Part 2 Specifications 1 Specifications 5...
Page 16: ...Specifications SiBE041525F 5 Specifications 1 Specifications See corresponding databook...
Page 51: ...SiBE041525F Remote Controller 40 Part 5 Remote Controller 1 Remote Controller 41...
