Potterton Performa 28i Installation And Servicing Instructions page 30

Heat Exchanger
Pipe Connecting
Clips
Electrodes
Electrode
Grommets
Electrode
Leads
30
Fig. 48
Burner
Fig. 49
12.0 Changing Components
12.3 Heat Exchanger (Fig. 48)
1. Note the positions of the two sensing tubes on
the outlet elbow and three wires on the fan motor
and remove them.
2. Slacken the screws on the outlet sealing collar.
Ease the collar upwards as far as possible.
3. Remove the four screws securing the
combustion box door and remove the door.
4. Remove the spring clips retaining the air box
side baffle plates. Disengage the tabs on the
baffles from the slots in the fan hood.
5. Undo the screws securing the fan hood to the
appliance back panel, and draw the fan and hood
assembly forwards.
6. Drain the primary circuit. Prise the two pipe
connecting clips off the joints in the flow and
return pipes.
7. Lift the heat exchanger to disconnect the flow
and return pipe joints. 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.
12.4 Burner (Fig. 49)
1. Remove the four screws securing the
combustion box door and remove the door.
2. Undo the screws securing the burner to the
injector manifold. 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.