Viessmann VITODENS 200 WB2A, Installation & Servicing Instructions Manual

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6 Routine Servicing
a)
Remove the outer casing as follows: Open the lower hinged controls cover.
Remove the two screws securing the bottom of the upper decorative cabinet and
remove this by pulling forward and place in a safe position. Disconnect the fixing
clips at the side of the control pod and hinge the pod forwards. (Refer to figure 5/F).
b)
Remove the sealed chamber front panel by removing the two fixing screws at
the bottom and hinge upwards unhooking from the top fixing lugs. Place the
cover in a safe position.
c)
Pull electrical cable connector from the fan motor (A), pressure switch (B), gas
valve (C), ionisation electrode (D) and ignition unit (E).
d)
Disconnect the union and release the gas connection pipe taking care not to
lose the sealing washer.
e)
Remove the four nuts (G) and remove the burner plate complete with the burner.
f)
Check the burner plate gasket for damage and change if necessary. Generally
this gasket should be changed every two years.
6.1 Routine Servicing
6.2 Ignition and Detection Electrodes
g)
Remove the ignition and detection electrodes.
h)
Check the electrodes for wear and contamination.
i)
Clean the electrodes with a small non abrasive brush.
j)
Check all clearances. If the gaps are not as specified or the electrodes are
damaged, replace and align the electrodes together with new gaskets after
inspection of the burner. Tighten the electrode fixing screws to 2.5Nm.
See diagrams overleaf
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