Potterton Performa 28i Installation And Servicing Instructions page 28

Fan and Hood
Assembly
Fig. 42a
Electrode
Grommets
Cartridge
Body
Filter Gauze
Flow
Regulator
Venturi
28
Spring Clip
Fig. 42
Fig. 43
Burner
Fig. 44
Inlet/Return Manifold
Baffle
Tab
Fig. 43a
Threaded
Bush
Blanking Cold Water
Inlet Tap
Cap
11.0 Servicing the Boiler
11.1 Annual Servicing (Cont)
10. Remove the spring clips retaining the air box
side baffle plates. Disengage the tabs on the
baffles from the slots in the fan hood (Fig. 42).
11. Undo the screws securing the fan and hood to
the appliance back panel. Draw the assembly
forwards (Fig. 42a).
12. 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
(Fig. 43).
13. Disconnect the electrode leads and grommets
from the electrodes. Completely remove the
burner (Fig. 43).
14. Brush any deposits from the injectors. Do not
use a pin or wire to clean them.
15. Brush the burner blades and venturis and
clean the combustion box.
16. Ensure that the heat exchanger fins are clear
of any obstruction.
DHW Filters (Fig. 44)
17. If the flow of domestic hot water is diminished,
it may be necessary to clean the filters.
18. Initially check the cold water inlet tap filter.
19. Turn the tap off. Undo the blanking cap and
remove the threaded bush (Fig. 43a).
20. Extract the filter and rinse thoroughly in clean
water. Reassemble and check the flow. If
required clean the manifold filter as described
below.
21. Undo the filter cartridge from the inlet/return
manifold.
22. Dismantle the cartridge and carefully remove
the flow regulator and filter gauze. Rinse them
thoroughly in clean water and reassemble in
reverse order.
23. Check that the pressure vessel charge is
0.5bar, reassemble in reverse order of
dismantling and recommission.
24. Complete the relevant section of the
"Benchmark" Installation, Commissioning and
Service Record Log Book and hand it back to the
user.