Benchmark MAIN Installation & Service Instructions Manual page 40

Pipe Connecting
Clips
Heat Exchanger
Electrodes
Electrode
Grommets
Electrode
Leads
40
© Baxi Heating UK Ltd 2007
Fig. 61
Burner
Fig. 62
14.0 Changing Components
14.3 Heat Exchanger (Fig. 61)
1. Remove the fan as described in section 14.1.
2. Drain the primary circuit. Prise the pipe connecting clips
off the joints in the flow and return pipes. Remove the heat
exchanger return pipe.
3. Lift the heat exchanger to disconnect the flow pipe joint.
Withdraw it from the appliance, taking care not to damage
the rear insulation piece.
8. Fit the new heat exchanger.
9. Reassemble in reverse order of dismantling, and
repressurise the system.
14.4 Burner (Fig. 62)
1. Remove the four screws securing the combustion box
door and remove the door.
2. On 28 HE models undo the screws securing the burner to
the injector manifold.
3. Draw the burner out of the combustion box, pulling the
electrode grommets from the slots in the combustion box
lower panel.
4. Disconnect the electrode leads and grommets from the
electrodes. Completely remove the burner.
5. Undo the screws securing the electrodes to the burner.
Examine the condition of the electrodes, replacing if
necessary. Fit the electrodes to the new burner.
6. Engage the burner location brackets over the studs on the
injector manifold and reassemble in reverse order.