156 720 607 090
13.3 Main Burner
Disconnect the pilot gas pipe at the gas valve.
Disconnect the pilot gas pipe from the pilot burner and
remove from the appliance complete with seal. Take care
not to lose the pilot injector.
Remove the two screws retaining the pilot bracket and
lift complete assembly clear.
Disconnect the union fittings at either end of the pressure
test pipe located to the left hand side of the burner.
Remove and retain the fibre washer.
Remove the pressure test pipe.
Lift and rotate the front edge of the burner backward
through 180 degrees. With the burner oriented
horizontally and upside down, withdraw forward beneath
the combustion chamber skirt. (fig. 19).
Inspect and clean the injectors if necessary.
Inspect and clean the main burner bars if necessary.
13.4 Re-assembling the Appliance
Re-assemble the appliance in reverse order ensuring the
following:
1. The flue hood outlet duct correctly enters the flue
terminal duct and the flue hood is fully seated against
the top of the heat exchanger.
2. The washer in the main gas line union connection
is correctly located.
3. The seals around the igniter cable/thermocouple
and pilot gas pipe are correctly seated in the
combustion chamber base and the pilot injector has
been fitted. (fig. 20).
Turn on the gas supply at the main gas service cock and
check for gas soundness BS 6891 while the appliance
is running.
Re-commission the appliance as detailed in Section 12.
Fig. 19
Fig. 20
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