Checking Temperature Sensors - Viessmann Vitotronic 200 Installation And Service Instructions For Contractors

Checking temperature sensors

Boiler, cylinder, flow and buffer temperature sensors; temperature sensor for low loss header;
return temperature sensor (Therm-Control sensor) and room temperature sensor
Note
The room temperature sensor is connected at termi-
nals 3 and 4 in the Vitotrol 300.
Viessmann NTC 10 k (blue ID label)
Ω
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50
Temperature in °C
Fig. 42
Outside temperature sensor
Viessmann NTC 10 k (blue ID label)
Ω
200
100
80
60
40
20
10
8
6
-20 -10 0
Temperature in °C
Fig. 43
Flue gas temperature sensor
When a specified limit is reached (see parameter "1F"
in the "Boiler" group), a service display appears.
70 90 110
10 20 30
Installation and service instructions "Vitotrol 300"
1. Pull out corresponding plug.
2. Check the sensor resistance and compare it to the
curve.
3. In the case of severe deviation, check sensor
installation 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 results are very different 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.
Troubleshooting
107