Additional information
101
System components
(continued)
Boiler temperature sensor, Part No. 7450 632 and DHW tank temperature sensor, Part No. 7450 633
Electrical connection
See page 38.
Check the sensor
1.
Disconnect plug
§
/
%
in the
terminal compartment.
2.
Measure resistance of sensor at
terminals ”1” and ”2” of the plug
or ”2” and ”3” (if a second DHW
tank temperature sensor is
connected).
Boiler water/
DHW tank
temperature
in °C / °F
Resistance
in
40 / 104
50 / 122
60 / 140
578
597
616
3.
Compare the value measured with
the actual temperature.
If the value differs significantly,
check installation and, if
necessary, replace sensor.
Technical data
Degree of
protection:
IP 32
Ambient
temperature
During operation:
– boiler temperature sensor:
0 to + 130°C
32 to + 266°F
– DHW tank temperature sensor:
0 to + 90°C
32 to + 194°F
During storage and transport:
–20 to + 70°C
- 4 to + 158°F
Extension kit for heating circuit with mixing valve, Part No. 7183 288
Accessory
Comprising supply temperature sensor as contact sensor for measuring the
supply temperature and mixing valve motor, with 4 m / 13 ft long connecting
cable and plug-in plug for connecting the heating circuit pump.
5285
941
-
0
1
400
0
540
560
580
600
620
640
660
680
700
720
740
760
20
40
60
80
100
120
140
Boiler water/DHW tank temperature in °C / °F
Resistance
in
32
68
104
140
176
212
248
284
