Potterton Performa 28i Installation And Servicing Instructions page 31

Electrodes
Electrode
Grommets
Electrode
Leads
Side Insulation
Combustion
Box Door
Fig. 51
Injector
Manifold
Injector
Burner
Fig. 50
Rear Insulation
Side Insulation
Front Insulation
12.0 Changing Components
Inlet Elbow
12.5
1. Remove the burner as described in Section
12.4.
2. Undo the screws securing the injector
Gasket
manifold to the inlet elbow and remove the
manifold.
3. Unscrew and replace injectors as required
and examine the sealing gasket, replacing as
necessary. Reassemble in reverse order.
12.6
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 lead and grommet from the
electrode being replaced. Undo the securing
screw and withdraw the electrode to the burner.
4. Reassemble in reverse order.
12.7
1. Remove the four screws securing the
combustion box door and remove the door.
2. Slide the side insulation pieces carefully out
of their carriers.
3. To replace the rear insulation piece it is
necessary to remove the heat exchanger as
described in Section 12.3 and slide out the side
pieces.
4. The combustion box door insulation piece
can be replaced by carefully bending up the two
retaining tabs.
5. Replace all insulation pieces and reassemble
in reverse order.
13.8
Injectors (Fig. 50)
Electrodes (Fig. 50)
Insulation (Fig. 51)
31