40
SERVICING
icos system - Installation and Servicing
50
FAN AND VENTURI ASSEMBLY REMOVAL AND CLEANING
1. Disconnect the electrical leads from the fan.
2. Undo the gas pipe union connection to the injector
housing.
3. Undo the screw on the fan mounting bracket.
4. Lift off fan and venturi assembly.
5. Inspect the injector for blockage or damage.
51
BURNER REMOVAL AND CLEANING
1. Remove the 6 screws securing the burner (the 3
screws at the rear are extended to ease access).
2. Lift off the burner from the combustion chamber.
IMPORTANT
The burner head is a ceramic plaque
construction. Care must be taken to ensure that
the burner is not placed down upon its face as
this may cause damage to the ceramic.
3. Brush off any deposits that may be on the
ceramic with a SOFT brush.
4. Inspect the sealing gasket around the burner and
combustion chamber insulation for any signs of
damage. Replace as necessary.
Note.
Take care not to disturb the ionisation probes at the
front and rear of the combustion chamber.
nm7400
Ionisation
Probes
1
2
4
SERVICING
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