39
Grant Vortex Oil Boilers
8 - BOILER SERVICING
Fig. 28
Combustion
head
Combustion head
fixing screw
Electrode clamp
screw
Electrode
leads
Nozzle
holder
Diffuser clamp
screw
Burner
flange
Fig. 29
Fig. 30
0
Screw
Slotted ring
Screw
Combustion
head
Combustion
head fixing
screw
A
B
Electrode clamp screw
5.75
0
-0.2
3
+0.5
0
Diffuser clamp screw
4.0
+0.5
7.5
+0.7
- 0.5
_
B
A
Diffuser disc
4
The combustion head position is adjustable on the
46/58 and 58/70 burners. Check that it is fully
closed (position 0), or the 4th line if the 58/70 has
been set to maximum output (70 kW).
To adjust the head setting, refer to Fig. 30 and
proceed as follows: Loosen the two screws in the
slotted ring - NOT the two fixing screws, and turn
the blast tube until '0' lines up with the edge of the
slotted ring. Tighten the two screws.
All models
1
Photocell - The photocell is a push-fit in the burner
body. Carefully pull out the photocell to clean.
2
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.
3
Pump filter - With the burner cover removed,
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 starting on
page 34.