10.0 Changing Components
21
10.4
Burner(s)
1. Undo the disconnecting union on the gas
inlet. Remove the screw securing the burner
ignition control to the gas valve. Draw the
control off the valve (Fig. 43).
2. Undo the two nuts securing the valve, injector
manifold and burner assembly to the boiler.
3. Hold the manifold and carefully draw the
assembly away from the boiler. Retain the
washer from the gas inlet connection.
4. Carefully draw the insulation piece away over
the burners (Fig. 44).
5. Undo the screws securing the burner(s) to be
replaced. Remove the burner(s) (Fig. 44).
6. Reassemble in reverse order, replacing the
insulation piece if it is damaged.
10.5
Injector(s)
(Figs. 44 & 45)
1. Using a suitable spanner undo from the
manifold the injector(s) to be replaced.
2. Reassemble in reverse order using a new
sealing washer for each injector.
10.6
Pilot Assembly
1.Disconnect and remove the pilot feed pipe.
Pull the electrode leads off the gas valve burner
ignition control and unclip them from the
separation brackets.
2. Undo the pilot bracket securing screws.
Withdraw the bracket from the burner mounting
plate. Carefully remove the pilot injector from
the bracket (Figs. 44 & 46).
3. Inspect the injector and replace if it is blocked
or damaged. Check the condition of the pilot
bracket sealing gasket and replace if necessary.
4. The new pilot assembly must be fitted as
shown, with the spark electrode to the right
(Fig. 46).
5. Clip the electrode leads into the separation
brackets. Ensure that the leads do not cross
over each other.
6. Reassemble in reverse order.
Manifold
Burner
Securing
Screws
Injector and Washer
Pilot Feed Pipe
Pilot Injector
Fig. 42
Fig. 44
Fig. 45
Fig. 46
Insulation
Pilot Bracket
Sealing Gasket
Securing Screw
Gas Valve
Disconnecting Union
Sealing Washer
Gas Cock
Fig. 43
Burner Ignition
Control
Spark Electrode
