Appendix A - Daikin FTXB50BV1B Service Manual

6.0 Appendix A

6.1 Thermistor resistance checking procedures
Remove the connectors of thermistors at PCB and measure resistance of each thermistor using tester as
shown below.
Resistance value refer to Resistance table below.
Indoor Wall Mounted
Outdoor Outdoor split
Table 1: Resistance R25 = 20K ohm
Temperature (°C)
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
Table 2: Resistance R25 = 10K ohm
t°C Rmin (kΩ) Rnom (kΩ)
-10 4.42E+01 4.53E+01
-9 4.21E+01 4.32E+01
-8 4.02E+01 4.12E+01
-7 3.83E+01 3.92E+01
-6 3.66E+01 3.74E+01
-5 3.49E+01 3.57E+01
-4 3.33E+01 3.41E+01
-3 3.18E+01 3.26E+01
-2 3.04E+01 3.11E+01
-1 2.90E+01 2.97E+01
0 2.78E+01 2.84E+01
1 2.66E+01 2.71E+01
2 2.54E+01 2.59E+01
3 2.43E+01 2.48E+01
4 2.33E+01 2.37E+01
5 2.23E+01 2.27E+01
6 2.14E+01 2.18E+01
7 2.05E+01 2.08E+01
8 1.96E+01 2.00E+01
9 1.88E+01 1.91E+01
10 1.80E+01 1.83E+01
11 1.73E+01 1.76E+01
12 1.66E+01 1.69E+01
13 1.59E+01 1.62E+01
14 1.53E+01 1.55E+01
15 1.47E+01 1.49E+01
16 1.41E+01 1.43E+01
17 1.35E+01 1.37E+01
:
ARXN/RXN50/60L,RX50CG
10KΩ (Table 2)
10KΩ(Table 2)
Resistance value (kΩ)
211.0
150.0
116.5
88.0
67.2
51.9
40.0
31.8
25.0
20.0
16.0
13.0
10.6
8.7
7.2
Rmax (kΩ) t°C
4.65E+01
4.43E+01 41
4.22E+01 42
4.02E+01 43
3.83E+01 44
3.65E+01 45
3.49E+01 46
3.33E+01 47
3.18E+01 48
3.03E+01 49
2.90E+01 50
2.77E+01 51
2.65E+01 52
2.53E+01 53
2.42E+01 54
2.31E+01 55
2.21E+01 56
2.12E+01 57
2.03E+01 58
1.94E+01 59
1.86E+01 60
1.78E+01 61
1.71E+01 62
1.64E+01 63
1.57E+01 64
1.51E+01 65
1.45E+01 66
1.39E+01 67
Tester
Resistance range
Rmin (kΩ) Rnom (kΩ)
5.47E+00 5.56E+00
5.28E+00 5.37E+00
5.10E+00 5.18E+00
4.92E+00 5.01E+00
4.75E+00 4.84E+00
4.59E+00 4.67E+00
44.4E+00 4.52E+00
4.29E+00 4.37E+00
4.15E+00 4.22E+00
4.01E+00 4.09E+00
3.88E+00 3.95E+00
3.75E+00 3.82E+00
3.63E+00 3.70E+00
3.51E+00 3.58E+00
3.40E+00 3.47E+00
3.29E+00 3.36E+00
3.18E+00 3.25E+00
3.08E+00 3.15E+00
2.98E+00 3.05E+00
2.89E+00 2.96E+00
2.80E+00 2.86E+00
2.71E+00 2.78E+00
2.63E+00 2.69E+00
2.55E+00 2.61E+00
2.47E+00 2.53E+00
2.40E+00 2.45E+00
2.32E+00 2.38E+00
ARXN/RXN25/35L/M,
ARXN/RXN50/60M
10KΩ (Table 2)
20KΩ (Table 1)
Rmax (kΩ)
5.64E+00
5.45E+00
5.27E+00
5.09E+00
4.92E+00
4.76E+00
4.60E+00
4.42E+00
4.30E+00
4.16E+00
4.03E+00
3.90E+00
3.77E+00
3.65E+00
3.54E+00
3.43E+00
3.32E+00
3.22E+00
3.12E+00
3.01E+00
2.93E+00
2.84E+00
2.75E+00
2.67E+00
2.59E+00
2.51E+00
2.44E+00
58