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12.0 CHANGING COMPONENTS
30
Publication No. 5111811
12.3 Heat Exchanger (Fig. 52)
1. Remove the fan as described in section 12.1.
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.
4. Fit the new heat exchanger, ensuring that the
tabs on the side insulation carriers engage in the
slots in the heat exchanger side plates.
5. Reassemble in reverse order of dismantling, and
repressurise the system.
12.4 Burner (Fig. 53)
1. Remove the four screws securing the combustion
box door and remove the door.
2. Draw the burner out of the combustion box,
pulling the electrode grommets from the slots in the
combustion box lower panel.
3. Disconnect the electrode leads and grommets
from the electrodes. Completely remove the burner.
4. 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.
5. Engage the burner location brackets over the
studs on the injector manifold and reassemble in
reverse order.
Burner
Electrode
Grommets
Electrode
Leads
Electrodes
Pipe Connecting Clips
Heat Exchanger
Fig. 52
Fig. 53