Changing Components - Baxi 124 Combi Installation And Service Manual

Spark Ignition
Electrode
Electrode
Leads
Flame Sensing
Electrode
Fig. 49
Cover
Gasket
Air/Gas
Collector
Gas Feed Pipe
34
© Baxi Heating UK Ltd 2017
Control Box removed
for clarity
Air/Gas
Venturi
Fan
Clip
Gasket
Fig. 51
Fan

13.0 Changing Components

IMPORTANT: When changing components ensure that both
the gas and electrical supplies to the boiler are isolated before
any work is started. When the component has been changed
recommission the boiler as described in Section 10.0.
Always examine any seals or gaskets, replacing where
necessary. The Case Front Panel MUST seal effectively against
the air box side panels.
See Section 12.1 "Annual Servicing" for removal of case panel,
door etc.
13.1 Spark Ignition & Flame Sensing Electrodes (Fig. 49)
1. Disconnect the electrode leads, noting their positions.
2. Remove the retaining screws securing each of the electrodes
to the combustion box cover and remove the electrodes.
3. Check the condition of the sealing gaskets and replace if
necessary. Reassemble in reverse order.
4. After changing the Flame Sensing Electrode check the
combustion - see Section 14.1.
5. When satisfactory combustion readings are not obtained
ensure the electrode position is correct and perform the
combustion check again.
13.2 Fan (Fig. 50)
1. Remove the clip securing the gas feed pipe to the air/gas
venturi. Disconnect the pipe.
2. Undo the screws securing the air/gas collector to the extension
piece and disconnect the fan electrical plugs (Fig. 50).
3. Remove the collector and fan assembly, being careful to retain
the gasket.
4. Undo the screws securing the fan to the collector. Retain the
gasket.
5. Undo the screws securing the venturi to the fan (noting its
position) and transfer to the new fan, replacing the seal if
necessary.
6. Examine the gasket(s) and replace if necessary.
7. Reassemble in reverse order and perform the Calibration
Function - see Section 14.2.
Fig. 50
13.3 Air/Gas Venturi (Figs. 50 & 51)
1. Remove the clip securing the gas feed pipe to the venturi.
2. Undo the screws securing the collector to the extension piece
and disconnect the fan electrical plugs.
3. Remove the collector and fan assembly, being careful to retain
the gasket.
4. Undo the screws securing the venturi to the fan (noting its
position) and fit the new venturi, replacing the seal if necessary.
Venturi
5. Examine the gasket and replace if necessary.
6. After changing the venturi check the combustion - see Section
14.1.