Boiler Servicing
35
11.4. Cleaning the Burner
The procedure is:
1. Combustion head - Loosen the two
screws securing the combustion
head and withdraw the head.
2. Clean the combustion head.
3. Inspect the ignition electrodes -
Loosen the electrode clamp screw
and withdraw the electrode
assembly. Wipe clean and check for
any cracks in the ceramic insulation.
Replace if necessary.
4. Check the electrode settings as
shown in Figure 11-5.
5. Nozzle - The nozzle should be
replaced on an annual service -
Check that the nozzle size and type
are correct, refer to table in Section
2 and boiler data label.
6. With the combustion head removed,
loosen the electrode assembly
clamp screw and slide the
electrodes away from the nozzle.
7. Do NOT attempt to clean the
nozzle.
8. Remove the nozzle using a good
fitting spanner (16mm).
!
CAUTION
The use of an ill-fitting spanner will
damage the nozzle and could lead to
an incorrect flame pattern.
9. Always check the electrode settings
after replacing the nozzle, see Figure
11-5.
10. Refit the combustion head.
All models
Photocell - The photocell is a push-fit in
the burner body. Carefully pull out the
photocell to clean.
Burner fan - Remove the air intake from
the burner. Check, inspect and clean
the fan as required.
Replace the cover.
Pump filter - Remove the four screws
securing the pump end cover. Remove
the filter and wash in kerosene. Replace
the filter and end cover, ensure the ‘O’
ring is in position.
Re-assemble in reverse order.
To ensure safe and efficient operation
of the boiler it is important that re-
commissioning is carried out,
especially combustion checks (CO
2
level, flue gas temperature and
smoke number) after the boiler has
been serviced.
Refer to the Commissioning
instructions in Section 10.
!
WARNING
Figure 11-5: Electrodes showing settings
4 +_ 0.3mm
3 to 3.5mm
Clamp screw
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