Maintenance - Wolf CGU-2-18 Installation And Maintenance Instructions Manual

Cleaning the gas burner:
- Switch OFF the boiler at the ON / OFF switch,
isolate it from the power supply and close the gas
valve
- Remove the casing lid of the gas fired boiler. For
this, pivot the control unit lid down, hook in the r.h.
and l.h. turnbuckle, undo the lower casing lid and
unhook at the top
- Push the retaining clip of the front cover up or down
out of the way and remove the front cover (only
with CGG-2(K)).
- Drain heating water, catch any water in a suitable
container
- Detach cables from the ionisation electrode [1] and
plug-in connection on the ignition electrode on the
gas combi valve
- Burner - remove fixing screws [2]
- Slacken the union nut on the flow and return
connection of the burner unit [3]
- Release the union nut of the gas supply pipe [4].
- The burner can be pulled out of the mounting
bracket by applying light outward pressure
- In its disassembled state both the electrodes and
the gas distributor pipe can be removed [5]
- Remove combustion residues with a brush
(non-metallic)
- Clean the nozzles and injectors, if required, with
a soft brush and compressed air
- Wash severely contaminated burners with a soapy
solution and rinse with tap water
- The burner is reinstalled in reverse order, but only
after cleaning the heating water heat exchanger
Burner unit fixing screws [2]
Please note: carry out in parallel with the other side
Fig.: Cleaning the gas burner
3062347_0309

Maintenance

Burner unit union nuts [3]
Fig.: Cleaning the gas burner
Fig.: Removed burner unit
Gas supply line union nut [4]
Fig.: Cleaning the gas burner
Ionisation electrode [1]
Burner unit fixing screws [2]
Gas distributor pipe hexagon nuts [5]
Ignition electrode [1]
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