Sensors - Viessmann Vitotronic 300 Installation And Service Instructions Manual

Vitotronic 300, GW5B Installation and Service

Sensors

Viessmann NTC 10 kΩ (blue identification)
Temperature
Viessmann NTC 10 kΩ
Temperature
Temperature
DHW tank, supply and room temperature sensor
Note: The supply temperature sensor of the mixing
valve extension kit is a contact temperature
sensor.
The room temperature sensor is connected
at terminals 3 and 4 in the Vitotrol 300A.
Installation and Service
Instructions for Vitotrol 300A
1. Pull corresponding plug.
2. Check the sensor resistance and compare it with
the curve.
3. In the case of severe deviation, check the installation
and replace the sensor if required.
Outside temperature sensor
1. Pull 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,
disconnect 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.
Flue gas temperature sensor, part no. 7452 531
Viessmann NTC 20 kΩ (orange identification)
When a limit entered in the Vitotronic 300, GW5B is
reached (see coding address "1F" in group 2 "Boiler"),
a service message appears.
1. Disconnect plug aG.
2. Check the sensor resistance and compare it with the
curve.
3. In the case of severe deviation, check the installation
and replace the sensor if required.
Components
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