Baxi Potterton 47-393-42, 47-393-40, 47-393-39, 47-393-41 manual Fan Fig, Venturi Fig, Injector Fig

Fig. 79

Burner

Gasket

Venturi

Injector

Cover

Gas Inlet Pipe

Gas Inlet

Fan

Venturi

Injector

Collector

Fig. 78

Fig. 80

When fitting the venturi ensure that the arrow is pointing forward

14.0Changing Components

14.3Fan (Fig. 79)

1.Undo the nut on the gas inlet pipe to the venturi (Fig. 79) and pull the sensing pipe off the fan.

2.Disconnect the electrode leads, noting their position and disconnect the fan electrical plugs.

3.Undo the screws securing the collector to the cover (33 models) or extension piece (24 & 28 models).

4.Remove the collector and fan assembly, being careful to retain the injector in the venturi.

5.Undo the screws securing the fan to the venturi and fit the new fan, replacing the seal if necessary.

6.Examine the burner gasket and replace if necessary.

7.Reassemble in reverse order, ensuring that the injector is in place and the sensing pipe is connected to the fan.

14.4Venturi (Fig. 78)

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. 84).

4.Examine the seals and burner gasket, replace if necessary.

5.Reassemble in reverse order, ensuring that the injector is in place.

14.5Injector (Fig. 78)

1.Remove the collector and fan assembly as described in section 14.3.

2.Extract and replace the injector and reassemble in reverse order.

© Baxi Heating UK Ltd 2012 43