Outside Temperature Sensor; Flue Gas Temperature Sensor, Part No. 7452 531 - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

Sensors
(cont.)
Viessmann NTC 10 k (blue marking)
Ω
20.0
10.0
8.0
6.0
4.0
2.0
1.0
0.8
0.6
0.4
10 30 50
Temperature in °C
Fig.53

Outside temperature sensor

Viessmann NTC 10 k
Ω
200
100
80
60
40
20
10
8
6
-20 -10 0
Temperature in °C
Fig.54

Flue gas temperature sensor, part no. 7452 531

When a specified limit is reached (see coding address
"1F" in the "Boiler" group), a service display appears.
70 90 110
10 20 30
1. Pull out corresponding plug.
2. Check the sensor resistance and compare it with
the curve.
3. In the case of severe deviation, check the installa-
tion and replace the sensor if required.
1. Pull out plug .
!
2. Check the sensor resistance across plug terminals
1 and 2, and compare with the curve.
3. If the event of severe deviation from the curve, dis-
connect the wires from the sensor and repeat the
test on the sensor.
4. Depending on the result, replace the lead or the
outside temperature sensor.
The burner is not blocked.
Components
85