Daikin Altherma 3 M - Page 264

3 | Components
Service manual
264
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
DANGER: RISK OF ELECTROCUTION
Confirm the rectifier voltage is below 10 V DC before proceeding, see "To prevent
electrical hazards"[4285].
2 Locate the thermistor. Check that the thermistor is correctly installed and that
there is thermal contact between the thermistor and the heat sink.
Is the thermistor correctly installed
(thermal contact between the
thermistor and the heat sink)?
Action
Yes Perform an electrical check of the
specific thermistor, see "Checking
procedures"[4261].
No Replace the main PCB, see "3.14Main
PCB"[4171].
To perform an electrical check of the fin thermistor
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "3.17Plate work"[4230].
1 Locate the thermistor on the appropriate PCB.
2 Measure the temperature using a contact thermometer.
Name Symbol Location (PCB) Connector
(pins)
Reference
(table)
Radiation fin
thermistor
R11T Main (O/U) X111A: 1‑2 A
INFORMATION
The thermistors may vary according to the specific unit.
3 Determine the thermistor resistance that matches the measured
temperature.
Thermistor – Table A
T °C kΩ T °C kΩ T °C kΩ T °C kΩ
–20 197.81 10 39.96 40 10.63 70 3.44
–19
–18
–17
–16
–15
–14
–13
–12
–11
186.53
175.97
166.07
156.80
148.10
139.94
132.28
125.09
118.34
11
12
13
14
15
16
17
18
19
38.08
36.30
34.62
33.02
31.50
30.06
28.70
27.41
26.18
41
42
43
44
45
46
47
48
49
10.21
9.81
9.42
9.06
8.71
8.37
8.05
7.75
7.46
71
72
73
74
75
76
77
78
79
3.32
3.21
3.11
3.01
2.91
2.82
2.72
2.64
2.55
–10 111.99 20 25.01 50 7.18 80 2.47