66
4.
Acknowledge excess temperature at the program-
ming unit of the control unit with
d
.
Sensors
Sensor type Pt1000:
■
Flow temperature sensor
■
Buffer temperature sensor
■
Return temperature sensor
■
Flue gas temperature sensor
■
Outside temperature sensor
For the curve of the sensor from the extension kit for
heating circuit with mixer, see page 70.
Connection
See chapter "Connection and wiring diagram" from
page 94.
Checking the sensors
Flue gas temperature sensor
Temperature in °C
0
100
200
300
0.75
1.25
1.75
2.25
Resistance
in kΩ
A
Fig. 37
A
Data point shown: resistance of 1.1 k
Ω
at a tem-
perature of 25 °C
Further PT1000 sensors
Temperature in °C
Resistance
in kΩ
40
30
20
10
0
-10
-20
-30
1.15
1.10
1.05
1.00
0.95
0.90
0.85
1.20
50
Fig. 38
1.
Pull out corresponding plug.
2.
Check the sensor resistance at the plug.
Maintenance
High limit safety cut-out
(cont.)
5777 985 GB
Maintenance
