Potterton Performa 24 Installation & Servicing Instructions Manual page 26

Fig. 51
Fan and Hood
Assembly
Fig. 53
Electrode
Grommets
Electrode
Leads
Cartridge
Body
Filter Gauze
Fig. 55
Flow
Regulator
26
Venturi
Spring Clip
Burner
Gas Supply Pipe
Inlet / Return Manifold
Baffle
Tab
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. 52).
Fig. 52
11. Undo the screws securing the fan hood
assembly to the appliance back panel, and draw
the fan and hood assembly forwards (Fig. 51).
12. Draw the burner out of the combustion box,
pulling the electrode grommets from the slots in
the combustion box lower panel (Fig. 53).
13. Disconnect the electrode leads and grommets
from the electrodes. Completely remove the
burner (Fig. 53).
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.
D.H.W. Filters
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. 53a).
Threaded
20. Extract the filter and rinse thoroughly in clean
Bush
water. Reassemble and check the flow. If
Fig. 53a
required clean the manifold filter as described
below.
21. Undo the filter cartridge from the inlet/return
manifold (Fig. 56).
22. Dismantle the cartridge and carefully remove
the flow regulator and filter gauze. Rinse them
thoroughly in clean water and reassemble in
reverse order (Fig. 55).
Blanking Cold Water
Cap Inlet Tap
23. Check that the pressure vessel charge is
0.5bar, reassemble in reverse order of
dismantling.
24. Turn the selector switch fully anticlockwise
against the spring pressure to position R and hold
for 2 seconds to reset the boiler before
recommissioning.
25. Complete the relevant section of the
"Benchmark" Installation, Commissioning and
Service Record Log Book and hand it back to the
user.
Fig. 56
11.0 Servicing the Boiler
11.1 Annual Servicing (Cont)