Technical data

Additional information
104
System components (VD2/VD2A/CT3 only)(continued)
Flue gas temperature sensor, Part No. 7450 630 Accessory
See page 48 for CM2 flue gas
temperature switch.
The sensor measures the flue gas
temperature and monitors the
selected limit value.
Electrical connection
The sensor is inserted in socket
”15” on the boiler control.
Check flue gas temperature sensor
1. Disconnect plug aG in the
terminal compartment of the
boiler control.
2. Measure resistance of sensor at
terminals ”1” and ”2” of the plug.
Flue gas
temperature
in °C / °F
Resistance
in Ω
ΩΩ
Ω
180 / 176
160 / 320
200 / 392
650
800
880
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 60
Ambient temperature
during operation:
–20 to + 600°C
3
2 to + 1112°F
during storage and transport:
–20 to + 70°C
–4 to + 158°F
5285 941 v.1.5
0
500
40 80
120 160 200 240 280
540
580
620
660
700
740
780
820
860
900
940
980
1020
Resistance in
Ω
Ω Ω
Ω
Flue gas temperature in °C / °F
32 104 176
248 360 392 464 536