11
Figure 20
Remove the screws securing the combustion
chamber cover. Lift off thelid and gasket
checking the gasket for signs of splitting,
and replace on re-fit as required.
Figure 21
Figure 22
Figure 23
Figure 24
Using a screwdriver through the holes in the
burner head, slacken then unscrew the
burner head.
Slacken with a spanner, then unscrew the
injector from its carrier. If servicing the
injector, blow through orifice, never drill or
broach out or use wire to clean. Replace if
blocked.
Remove the screws securing the electrode
assembly to the side of the burner assembly.
Examine the electrode assembly and if in
not good condition replace as necessary by
removing the screws as indicated and
disconnection of leads from wiring harness.
On service or replacement of the electrode
assembly check the spark electrode gap is
3.5mm = or -0.5mm.
Replace burner head and injector if
necessary and re-fit components in reverse
order of removal.
Disconnect connectors on gas valve from
wiring harness and remove silicon tube.
Figure 25
Figure 26
Remove the four screws securing the gas
valve to the burner assembly. The gas valve
can now be replaced.
After re-fitting in reverse order of removal,
and prior to fitting the controls cover,
ensure all joints are gas tight, and set burner
pressure to that indicated on the data
badge.
Vacuum switch
Remove the air grille or ducted air
attachement from the side of the burner
assembly.
Electrode assembly
Gas valve
Follow instructions for replacment of burner
head and injector then proceed as follows:
Disconnect the two silicon rubber tubes and
the electrical connectors.
Figure 27
Remove the vacuum switch bracket screws
the unscrew pressure from the bracket.
Re-fitting in reverse order of removal, then
ensure connections are made as indicated in
the diagram below.
Burner head, Injector and Electrode
assembly
