Viessmann VITODENS 200 WB2A, Installation & Servicing Instructions Manual

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a)
Gain access by following step 9.1(b).
b)
Close the isolation valves between the boiler and the central heating system.
Attach a suitable hose to the drain point on the lower right hand side of the
boiler and drain the boiler.
c)
Disconnect the two screws securing the motor and valve in place and
withdraw the assembly.
NOTE: There may be a small discharge of water hence precautions should be taken.
d)
Unplug the electrical wiring from the assembly after releasing the securing tab.
e)
Replace the internal assembly and reassemble in reverse order.
f)
Finally, close the drain, open the CH isolation valves, ensure that the outer
casing is secured in position and carry out an ignition and control check.
a)
Pull the leads from the flue gas temperature sensor.
b)
Pull the sensor together with its mounting bush from its aperture in the boiler flue.
c)
Replace as reverse of removal and reconnect leads.
d)
Check for correct functioning
9 Replacement of Parts
9.14 Flue Gas Temperature Sensor
9.15 Diverter Valve Mechanism (Combi Only)
A
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