Viessmann VITODENS 200 WB2A, Installation & Servicing Instructions Manual

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a)
Gain access by removing the burner assembly as described in section 9.1,
steps (b) to (g).
b)
Pull off the HT leads from the spark generator.
c)
Remove the ignition electrodes by releasing the two 5mm socket head screws
and withdrawing the electrodes.
d)
Fit a new electrode assembly using a new gasket and check all clearances. If
the gaps are not as specified align the electrodes. Tighten the electrode fixing
screws preferably to a torque of 2.5 Nm.
e)
Check the combustion chamber gasket for any damage and reassemble in
reverse order.
f)
Finally, ensure that the outer casing is secured in position and carry out a
combustion check as in 5.6.
a)
Gain access by removing the burner assembly as described in section 9.1,
steps (b) to (g).
b)
Remove the ignition and detection electrodes.
c)
Release the three Torx screws and remove the thermal insulating ring (B).
d)
Release the four Torx screws and remove the burner assembly (C) with its gasket.
e)
Replace the burner using a new gasket (D) preferably to a torque of 3.5 Nm.
f)
Refit the thermal insulating ring (B).
g)
Check the combustion chamber gasket for any damage and reassemble in
reverse order.
h)
Finally, ensure that the outer casing is secured in position and carry out a
combustion check as in 5.6.
9 Replacement of Parts
9.3 Burner
9.4 Ignition Electrodes
55