2 Components
Service manual
42
ATXP20~3 FTXP20~7 ARXP20~3
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
2.13.1
Refrigerant thermistors
Checking procedures
INFORMATION
It is recommended to perform the checks in the listed
order.
To perform a mechanical check of the specific thermistor
Prerequisite:
Turn OFF the unit via the user interface.
Prerequisite:
Turn OFF the respective circuit breaker.
Prerequisite:
Remove the required plate work, see
1
Locate the thermistor and remove the insulation if needed.
Check if there is thermal contact between the thermistor and
the piping or ambient.
Is the thermistor correctly
installed (thermal contact
between the thermistor and the
piping)?
Action
Yes
Perform an electrical check of the
specific thermistor, see
"Checking procedures" on
page 42
No
Correctly install the thermistor,
see
To perform an electrical check of the specific thermistor
Prerequisite:
First perform a mechanical check of the thermistor,
see
"Checking procedures" on page 42
1
Locate the thermistor.
2
Measure the temperature using a contact thermometer.
Name
Symbol
Location
(PCB)
Connector
(pins)
Type
Air
thermistor
R1T
Main
S90:1‑2
1
Heat
exchanger
thermistor
R2T
Main
S90:3‑4
1
Discharge
pipe
thermistor
R3T
Main
S90:5‑6
1
Heat
exchanger
thermistor
R2T
Indoor
S32:1‑2
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. R1T 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 S90
pin 1‑2:
Measured resistance: 21.86 kΩ,
▪ Measured resistance value is inside the range. R1T
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.
Содержание Comfora FTXP20~71L2V1B
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