35
Grant Euroflame Condensing External Modules
9 - BOILER SERVICING
Fig. 22
4 ± 0.3 mm
3 to 3.5 mm
Clamp screw
Cleaning the burner
9.4
Fig. 21 - Removal/replacement of spiral turbulators
See Section 13
1 Combustion head - Loosen the two screws
securing the combustion head and withdraw the
head. Clean and refit the combustion head.
2 Inspect the ignition electrodes - Remove the
combustion head.
Loosen the electrode clamp screw and withdraw
the electrode assembly. Wipe clean and check for
any cracks in the ceramic insulation. Replace if
necessary.
Check the electrode settings
Electrode tips approximately 4 mm apart and 3 to
3.5 mm in front of the nozzle, see Fig 22.
3 Nozzle - The nozzle should be replaced on an
annual service - Check that the nozzle size and type
are correct, refer to table in Section 3.3 and boiler
data label.
Turbulators
IMPORTANT:
The ends of the
turbulators must
be vertical
Position in vertical plane
With the combustion head removed, loosen the
electrode assembly clamp screw and slide the
electrodes away from the nozzle.
Do NOT attempt to clean the nozzle.
Remove the nozzle using a good fitting spanner
(16 mm). The use of an ill-fitting spanner will
damage the nozzle and could lead to an incorrect
flame pattern. Always check the electrode
settings after replacing the nozzle, see Fig. 22.
4 Photocell - The photocell is a push-fit in the burner
body. Carefully pull out the photocell to clean.
5 Burner fan - With the air intake grille removed,
remove the screws securing the fan housing cover
(R/H side of burner) and remove the cover. Inspect
the fan and housing and clean as necessary.
Replace the cover.
6 Pump filter - With the burner cover removed,
remove the four screws securing the pump end
cover. Remove the filter and wash in kerosene.
Check for the presence of sludge or water. 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 starting on
page 30.
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