Grant 50/70 User, Installation And Servicing Instructions page 38

1.7 to 3.7mm
9.5 to 11.5mm
IMPORTANT:
The electrode settings given MUST be observed
4 Riello burner photocell - The photocell is a push-
fit in the burner body. Carefully pull out the
photocell to clean.
EOGB burner photocell - Remove the controls
cover plate (see Fig. 25) and carefully withdraw the
photocell, see Fig. 22.
5 Riello burner fan - With the air intake grille or
spigot 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.
EOGB burner fan - The fan wheel and housing
are accessible when the main burner and front
assemblies are separated. Clean as necessary.
Main burner assembly
38
7 - BOILER SERVICING
0.0 to 2.0mm
Fig. 28 - EOGB Sterling 90 burner head/electrode settings
Fig. 29 EOGB Sterling burner
Multi Pass Oil Boilers
36 mm
Measured from the face of the nozzle
to the front edge of the blast tube
6 Pump filter - With the burner cover removed
(Riello burner), 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
temperature and smoke number) after the boiler
has been serviced.
Refer to the Commissioning instructions starting on
page 33.
Front assembly
level, flue gas
2