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Maintenance
High limit safety cut-out
4. Acknowledge excess temperature at the program-
ming unit of the control unit with
Sensors
Sensor type Pt1000:
Flow temperature sensor
■
Buffer temperature sensor
■
Return temperature sensor
■
■
Flue gas temperature sensor
■
Outside temperature sensor
Connection
See chapter "Connection and wiring diagram" from
page 94.
Checking the sensors
Flue gas temperature sensor
2.25
1.75
1.25
0.75
0
A
Temperature in °C
Fig. 37
Data point shown: resistance of 1.1 k
A
perature of 25 °C
Further PT1000 sensors
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
-30
-20
-10
Temperature in °C
Fig. 38
1. Pull out corresponding plug.
66
(cont.)
d
.
100
200
at a tem-
Ω
0
10
20
30
40
For the curve of the sensor from the extension kit for
heating circuit with mixer, see page 70.
300
50
2. Check the sensor resistance at the plug.
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