Removing The Burner - Viessmann Vitodens 050-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Removing the burner

Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain live even after the power
supply has been switched off.
Do not touch the wiring chambers (control
■
unit and mains connections).
When working on the appliance, isolate the
■
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer live and safeguard against
reconnection.
Prior to working on the appliance, wait at
■
least 4 min until the voltage has completely
dropped out.
1. Turn off the ON/OFF switch.
2. Close the gas shut-off valve and safeguard against
reopening.
3. Disconnect cables and leads from:
■ Fan motor (2 plugs)
A
■ Ionisation electrode
Ignition unit
■ C
■ Earth D
40
B
4x
F
D
C
B
A
Fig. 28
4. Undo gas supply pipe fitting
5. Undo 4 screws and remove the burner.
F
Note
Cover gas connection
can fall into it.
E
.
E
so that no small parts
E