Baxi 47 075 35 Installation & Servicing Instructions Manual page 58

Fig. 73
14.4 Venturi (Fig. 71)
1. Remove the collector and fan assembly as described in section 14.3.
2. Extract the injector from the venturi.
3. Undo the screws securing the fan to the venturi and the venturi to the collector.
IMPORTANT: When fitting the new venturi, ensure the arrows on it's base point into the collector (Fig. 73).
4. Examine the seals and burner gasket, replace if necessary.
5. Reassemble in reverse order, ensuring that the injector is in place.
14.5 Injector (Fig. 71)
1. Remove the collector and fan assembly as described in section 14.3.
2. Extract and replace the injector and reassemble in reverse order.
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14.6 Burner (Fig. 74)
1. Undo the screws securing the collector to the venturi and extension piece. Remove this extension piece from the cover (on 24 and
28 models).
2. Withdraw the burner from the cover and replace with the new one.
3. Examine the gasket, replacing if necessary.
4. Reassemble in reverse order.
14.7 Insulation (Fig. 75)
1. Remove the electrode leads, noting their positions. Also remove the electrodes as described in section 14.2.
2. Undo the screws securing the collector to the venturi and the nuts holding the cover to the heat exchanger. Draw the collector and
cover assembly away.
3. Remove the cover insulation piece.
4. Fit the new insulation carefully over the burner and align it with the slots for the electrodes.
5. If the rear insulation requires replacement remove it and all debris from the heat exchanger. Also it may be necessary to separately
remove the spring clip from the pin in the centre of the heat exchanger and the 'L' shaped clips embedded in the insulation.
6. DO NOT remove the shrink­wrapped coating from the replacement rear insulation. Keep the insulation vertical and press firmly into
position.
7. Examine the cover seal and replace if necessary.