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(g)
Reassemble in the reverse order. Ensure that the 0-ring is
located in the end of the burner manifold.
(h) Check the gas soundness of the connection between the
burner manifold and the gas line. See Section 16-Routine
Cleaning and Inspection.
2-
THE MAIN BURNER INJECTOR
Fig. 18.
(a)
Remove the burner. See Instruction 1 preceding.
(b)
Remove the lint arrestor assembly.
(c)
Remove the main injector from the burner.
(d)
Fit the new main injector and re-assemble the main burner
assembly in the reverse order.
3.
THE LINT ARRESTER ASSEMBLY
(a)
Remove the main burner. See Instruction 1 preceding.
(b)
Remove the MS screw securing the lint arrester assembly and
lift the rear frame away from the burner.
(c)
Remove the clip beneath the arrester assembly and lift away
the side frames to left and right.
(d) Lift the front frame up and away from the burner mixing tube.
(e)
Clean the gauze by shaking, washing in soapy water or brushing
with a non-metallic brush. Take care not to damage the gauze
or its assembly housing.
4.
THE PILOT INJECTOR
Remove the main burner assembly. See Instruction 1
preceding.
(a)
Disconnect the thermocouple nut at the pilot burner assembly
and ease it from the assembly.
(b)
Disconnect the pilot pipe from the pilot burner. Slacken the
pilot tube conrjection at the adaptor within the combustion
chamber and move the pilot pipe away from the pilot
assembly.
(c)
The pilot injector may now be removed. It may be necessary to
carefully ease the injector free.
(d)
Fit a new pilot injector and reassemble in the reverse order.
5.
THE SPARK ELECTRODE
Fig. 20.
Remove the main burner assembly. See Instruction 1
preceding.
(a)
Release the hexagon nut securing the spark electrode to the
pilot assembly and remove.
(b)
Fit a new spark electrode. Check that the spark gap is 3-4 mm
(0.14 in.). See Fig. 19.
6.
THE PILOT SHIELD
Fig. 21.
Remove the main burner assembly. See· Instruction 1
preceding.
(a)
Remove the two M4 screws and nuts securing the pilot shield
to the pilot bracket.
(b)
Fit a new pilot shield and reassemble in the reverse order.
7. THE PILOT BURNER
Fig. 20.
Remove the main burner assembly. See Instruction 1
preceding.
(a)
Remove the spark electrode, pilot shield and injector as
previously described.
(b)
Remove the remaining M4 screw from the pilot bracket and
remove the pilot burner.
(c)
Fit a new pilot burner and reassemble in the reverse order.
Check that the pilot assembly is fitted above the mounting
bracket on the main burner.
8.
THE THERMOCOUPLE
Fig. 17.
(a)
Disconnect the thermocouple nut at the pilot bracket and ease
the thermocouple from the assembly.
19
Fig. 1 9. Pilot head/electrode position.
3
to
4
mm
10.1~-
in.)
-~--
PILOT FLAME LENGTH
13
to
18
mm
10.5
in. to
0.75
in.)
(b)
Release the thermocouple from its connection at the right
hand side of the gas valve.
(c)
Remove the sealing cover and gasket from the boiler base by
releasing the MS screw.
(d)
Remove the thermocouple from the boiler. To prevent the risk
of damage, remove the electrode lead before removing the
thermocouple
(e)
Reassemble in the reverse order using
a.
new thermocouple.
Avoid sharp bends in the thermocouple lead and ensure that
it follows the same route as the original. Check that the
thermocouple is seated correctly against the gasket where it
enters the burner compartment. Fit a new gasket if necessary.
9.
THE ELECTRODE LEAD
Fig. 22.
(a)
Carefully pull the lead off the connector tab at the electrode
and at the piezo unit.
(b)
Remove the lead and fit a replacement.
1
o.
THE COMBUSTION CHAMBER INSULATION
Fig. 17.
(a)
Cover the burner and pilot with a clean cloth to prevent any
loose matter falling onto the assembly.
(b)
Remove the flue hood as described in Section 16 (3b)-Routine
Cleaning and Inspection.
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