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221474C
2.2 Isolation and Access
Before starting, refer to Section 1.1.
Isolate the boiler from the electrical supply and close the gas
service cock, refer to Section 1.3.
Remove the outer case and the inner case cover, refer to Sections
1.4 and 1.5.
Disconnect the electrical plug connector from the fan, see diagram
2.1.
Remove the flue collector securing screws, see diagram 2.1.
Remove the fan securing screws.
Pull the fan forwards, at the bottom and rotate to disengage the fan
outlet to flue elbow and rear bracket.
Take care not to damage the seal.
Tilt the fan and withdraw.
Remove the flue collector, note, this may be a tight fit.
Remove the combustion chamber front panel, secured with four
screws, see diagram 2.2.
Remove the spark electrode assembly from the burner, secured by
2 nuts, see diagram 2.3 and carefully lay it down in the combustion
chamber.
Remove the burner support bracket wing nut and securing screw,
see diagram 2.4.
NOTE: The sensing lead is connected to the burner. Disconnect
the lead when the burner is being removed.
Remove the main burner from the main injector at the rear, see
diagram 2.4. Raise the burner up and forwards. Take care not to
damage the combustion chamber insulation.
2.3 Heat Exchanger
Place a sheet of paper or similar in the combustion chamber, to act
as a collector for deposits removed.
Brush the heat exchanger with a suitable brush, remove paper
together with any debris.
2.4 Main Injector
Inspect the injector and clean as necessary.
Do not use wire or a sharp instrument on the hole.
2.5 Main Burner
Use a vacuum cleaner or suitable brush to clean the burner
thoroughly, making sure that all burner ports are clear and free from
obstructions.
Do not use a brush with metallic bristles.
2 Servicing
Diagram 2.1
FAN OUTLET
SEAL
PLUG
FLUE
COLLECTOR
SECURING
SCREWS (2)
FAN
SECURING
SCREWS
6922
Diagram 2.2
SECURING
SCREW (4)
COMBUSTION
CHAMBER FRONT PANEL
HEAT
EXCHANGER
5684