andrews MAXXflo EVO CWH 150/302 Installation And Maintenance Manual page 55

6.1.1.1 INSPECT AND CLEAN BURNER ASSEMBLY
To view the burner and the inside of the heat exchanger it is recommended that you remove the
front of the heat exchanger complete with the fan, venturi and gas valve.
The following steps need to be completed before the combustion chamber and burner can be inspected:-
• Isolate heater from the electrical supply.
• Open the outer heater cover door by removing the screws on the left hand side and opening the door
of the heater.
• Disconnect the electrical connections to the fan
Disconnect power
supply
• Disconnect the venturi from the fan, by removing the two cap head screws. Remember to retain the
cork gasket for re-assembly
• Disconnect the spark and Ionisation leads
• Undo the six burner door nuts
Disconnect
• Pull the whole burner assembly outwards and left away from the gas valve
Maintenance
Disconnect PWM
c c o control
55
D D Disconnect
MAXXfl o EVO 150/302