DISMANTLING THE BURNER TRAY - continued
The filter element should also be blown clean. This component should not require replacement,
however if signs of deterioration are evident then a genuine spare must be used. If a large
amount of debris is present in the filter then the pipework and control should be thoroughly
cleaned before re-assembly.
CHECKING THE FAN ASSEMBLY
Disconnect the electrical supply, and remove the fan terminal cover. Check all components for
signs of deterioration paying attention to the wiring, and ensuring all electrical connections are
good.
Remove the terminal from the wall and check the flue tube is in the correct position. Check the
flue is free from obstruction along its entire length. Clean outlet and airflow sensors with a suit-
able brush. Clean fan vanes and remove any debris. Ensure sealing rings are in position. Refit
the terminal to the wall. Ensure that no plants etc. obscure the exhaust outlet.
Reconnect the electrical supply and check the operation of the fan. Press the ON switch, the fan
should build up speed with the warning light illuminated and then rest at normal operating
speed. The light on the control box should extinguish. The safety solenoid on the burner tray
should now open. Establish a pilot flame but DO NOT light the main burner. Block the fan outlet
with a piece of card. The fan should build up speed in an effort to clear the ‘obstruction’, when
this fails the pilot will be extinguished and the fan cut out. When you are sure the operation is
correct, refit the terminal cover and wire cage.
CONTROL BOX REMOVAL
Disconnect the electrical supply and isolate the gas supply. Remove the burner tray as previous-
ly described in the relevant section. Remove the two securing screws and lift away the control
box heatshield. Slide the control box to the left off its mounting bracket, and remove the multi-
way connector from the rear.
Replacement is reverse of removal, taking care to ensure the box is mounted securely and each
individual connector pin makes good contact with the control box pin.
Schematic of appliance wiring
20
13.2
13.3
13.4
Control Box
Thermal Switch
Fan
Pressure switch
Safety solenoid
Mains supply
©
2009 Focal Point Fires plc.
