39
14.0 Changing Components
© Baxi Heating UK Ltd 2011
14.3
Fan
1. Undo the nut on the gas pipe at the gas/air inlet (Fig. 77)
and the gas valve. Remove the pipe, taking care not to lose
the sealing washers. Also remove the injector.
2. Disconnect the electrode lead caps, remove the strain
relief clip from the sensing lead and disconnect the lead.
Remove the fan electrical plugs and pull the sensing pipe off
the fan.
3. Undo the screw securing the fan air inlet pipe to the
bracket on the boiler top panel. Remove the pipe (Fig. 78).
4. Undo the five retaining nuts and washers and remove the
fan, gas/air inlet and burner assembly (Fig. 79).
5. Remove the air box and gasket from the fan and transfer
to the new fan. Examine and replace the gasket if necessary.
6. Remove the four nuts and separate the fan from the
gas/air inlet. Note the position of the orifice plate and
examine the gasket, replacing if necessary (Fig. 79).
7. Fit the new fan, ensuring that the orifice plate is correctly
fitted, and that the gasket is in position.
8. Examine the insulation around the burner and the heat
exchanger gasket and replace if necessary.
9. Reassemble in reverse order, ensuring that the injector is
in place and the sensing pipe is connected to the fan.
14.4
Injector (Fig. 77)
1. Undo the nut on the gas pipe at the gas/air inlet and the
gas valve. Remove the pipe.
2. Extract and replace the injector and reassemble in reverse
order. Check the condition of the sealing washers, replacing
if necessary.
Air Box
Fan
Gasket
Orifice Plate
Fig. 79
Fig. 77
Gas Pipe
Injector
Fan Air Inlet Pipe
Gas/Air Inlet
Gasket
Gasket
Gas/Air Inlet
Fig. 78
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