Daikin Altherma EBLQ011CA3V3 - Page 85

2 Components
Service manual
85
EBLQ+EDLQ011~016CAV3+W1 + EBLQ+EDLQ011~016CA3V3+W1
+ EK(2)CB07CAV3 + EKMBUHCA3V3+9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
Is the thermistor correctly
installed (thermal contact
between the thermistor and the
piping)?
Action
No Correctly install the thermistor,
see "Repair procedures"on
page86.
To perform an electrical check of the specific thermistor
Prerequisite: First perform a mechanical check of the thermistor,
see "Checking procedures"on page84.
1 Locate the thermistor.
INFORMATION
Remove the thermistor from its holder if not reachable with
a contact thermometer.
2 Measure the temperature using a contact thermometer.
Name Symbol Location
(PCB)
Connector
(pins)
Type
Outlet water
after plate
type heat
exchanger
thermistor
R1T A1P X5A: 1‑2 1
Ambient
sensor user
interface.
R1T A5P X5M: 1‑2 1
Ambient
sensor ON/
OFF
thermostat.
R1T A3P X2M: 1‑2 1
External
indoor floor/
ambient
thermistor
R2T A3P X1M: 1‑3 1
Inlet water
thermistor
R4T A1P X8A: 1‑2 1
Domestic
hot water
tank
thermistor
R5T A4P X2M: 3‑4 1
External
indoor or
outdoor
ambient
thermistor
R6T A1P X5M: 5‑6 1
INFORMATION
The thermistors may vary according to the specific unit.
3 Determine the thermistor resistance that matches the measured
temperature.
Type 1 thermistor
T °C kΩ T °C kΩ T °C kΩ T °C kΩ
–20 197.81 10 39.96 40 10.63 70 3.44
T °C kΩ T °C kΩ T °C kΩ T °C kΩ
–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
–9
–8
–7
–6
–5
–4
–3
–2
–1
106.03
100.41
95.14
90.17
85.49
81.08
76.93
73.01
69.32
21
22
23
24
25
26
27
28
29
23.91
22.85
21.85
20.90
20.00
19.14
18.32
17.54
16.80
51
52
53
54
55
56
57
58
59
6.91
6.65
6.41
6.65
6.41
6.18
5.95
5.74
5.14
0 65.84 30 16.10 60 4.87
1
2
3
4
5
6
7
8
9
62.54
59.43
56.49
53.71
51.09
48.61
46.26
44.05
41.95
31
32
33
34
35
36
37
38
39
15.43
14.79
14.18
13.59
13.04
12.51
12.01
11.52
11.06
61
62
63
64
65
66
67
68
69
4.70
4.54
4.38
4.23
4.08
3.94
3.81
3.68
3.56
4 Disconnect the thermistor connector from the appropriate PCB.
5 Measure the resistance between the appropriate pins of the
thermistor connector.
6 Check that the measured resistance value matches the
resistance determined through the measured temperature
(earlier step in the procedure). E.g. R4T thermistor:
▪ Measured temperature with contact thermometer: 23.1°C,
▪ Resistance value determined through temperature (using the
table for type 1 thermistors):
Resistance at 23°C: 21.85kΩ,
Resistance at 24°C: 20.90kΩ,
▪ Disconnect connector and measure resistance between X8A
pin 1‑2:
Measured resistance: 21.86kΩ,
▪ Measured resistance value is inside the range. R4T
thermistor passes the check.
INFORMATION
All thermistors have a resistance tolerance of 5%.
INFORMATION
The user interface allows to monitor most thermistors.
If the measured resistance value matches the resistance
determined through the measured temperature, but the
temperature for the corresponding thermistor is NOT
correct on the user interface display, replace the applicable
PCB.