Viessmann VITODENS 200 WB2A, Installation & Servicing Instructions Manual

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a)
Gain access by following step 9.1(b).
b)
The DHW Comfort sensor is situated at the front of the domestic hot water heat
exchanger.
c)
Disconnect the two electrical connections from the sensor.
d)
Remove the sensor by sliding upwards out of its housing.
e)
Replace the sensor as reverse of removal.
f)
Finally, ensure that the outer casing is secured in position and carry out an
ignition and hot water temperature check.
9.12 DHW Comfort Sensor (B) (Combi only)
9 Replacement of Parts
a)
Gain access by following step 9.1(b).
b)
Isolate the DHW circuit closing the DHW inlet valve. Drain the DHW circuit by
opening any DHW tap below the level of the boiler.
c)
The DHW thermistor is situated over the domestic hot water outlet above the
piping frame.
d)
Disconnect the two electrical connections from the thermistor.
e)
Slide out the clip securing the thermistor in position and pull out the thermistor.
NOTE: There may be a small discharge of water hence precautions should be taken.
f)
Replace the thermistor and reassemble in reverse order.
g)
Finally, open the DHW inlet valve, ensure that the outer casing is secured in
position and carry out an ignition and hot water temperature check.
9.11 DHW Thermistor (A) (Combi only)
60