Daikin FTXA20A Service Manual page 152

2 | Components
Service manual
152
T °C kΩ T °C
–9 106.03 21
–8 100.41 22
–7 95.14 23
–6 90.17 24
–5 85.49 25
–4 81.08 26
–3 76.93 27
–2 73.01 28
–1 69.32 29
0 65.84 30
1 62.54 31
2 59.43 32
3 56.49 33
4 53.71 34
5 51.09 35
6 48.61 36
7 46.26 37
8 44.05 38
9 41.95 39
4 Measure the resistance between the appropriate connection points of the
thermistor.
5 Check that the measured resistance value matches the resistance determined
through the measured temperature (earlier step in the procedure). E.g:
▪ Measured temperature with contact thermometer: 23.1°C,
▪ Resistance value determined through temperature (using the thermistor
table A):
Resistance at 20°C: 24.3 kΩ,
Resistance at 25°C: 19.4 kΩ,
▪ Measure resistance between pin 1‑2:
Measured resistance: 21.86 kΩ,
▪ Measured resistance value is inside the range. Thermistor passes the check.
INFORMATION
All thermistors have a resistance tolerance of 3%.
Does the measured resistance of the
thermistor match with the
temperature determined resistance?
Yes
No
kΩ T °C kΩ
23.91 51 6.91
22.85 52 6.65
21.85 53 6.41
20.90 54 6.65
20.00 55 6.41
19.14 56 6.18
18.32 57 5.95
17.54 58 5.74
16.80 59 5.14
16.10 60 4.87
15.43 61 4.70
14.79 62 4.54
14.18 63 4.38
13.59 64 4.23
13.04 65 4.08
12.51 66 3.94
12.01 67 3.81
11.52 68 3.68
11.06 69 3.56
Action
Thermistor is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
Replace the specific PCB, see
"2 Components" [
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
T °C kΩ
4
40].
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05