45
Combustion
head
Combustion head
fixing screw
Electrode clamp
screw
Electrode
leads
Nozzle
holder
Diffuser clamp
screw
Burner
flange
Boiler Servicing
4 ± 0.3 mm
3 to 3.5 mm
Clamp screw
Figure 11-5:
15/21, 15/26, 26/36, 36/46
electrode settings
46/58 or 58/70 models
The procedure is as follows:
1. Combustion head: Loosen the two
screws securing the combustion head
(
not
the screws in the slotted ring,
Figure 11-8) and withdraw the head.
2. Clean and refit the combustion head.
3. Inspect the ignition electrodes:
Loosen the electrode clamp screw,
disconnect the leads and withdraw the
electrode assembly. Wipe clean and
check for any cracks in the ceramic
insulation. Replace if necessary.
4. Check the electrode and diffuser
settings:
Figure 11-7.
5.
To adjust the diffuser disc: Loosen
the diffuser clamp screw and slide
the disc along the nozzle holder to
achieve the gap 'A' in Figure 11-7,
tighten the screw.
Figure 11-6:
46/58, 58/70 burner
6. To adjust the electrodes: Loosen the
electrode clamp screw and move the
electrode unit to achieve the gap 'B'
in Figure 11-7, tighten the screw.
7. 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).
8. To adjust the head setting, refer to
Figure 11-8 and proceed as follows:
Loosen the two screws in the slotted
ring -
not
the two fixing screws, and
turn the blast tube until '0' or the
4th line lines up with the edge of the
slotted ring (see paragraph 7 above).
Tighten the two screws.
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
Figure 11-7:
46/58, 58/70 electrode settings
0
Screw
Slotted ring
Screw
Combustion
head
Combustion
head fixing
screw
Figure 11-8:
46/58, 58/70 head settings
All models
Photocell -
The photocell is a push-fit in the
burner body. Carefully pull it out to clean.
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.
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 in Section 10.
WARNING
!
