Baxi Combi Instant 80 HE Installation & Servicing Instructions Manual page 30

Fan and Hood
Assembly
Fig. 43
Electrode
Grommets
Cartridge
Body
Filter Gauze
Flow
Regulator
Venturi
30
Spring Clip
Fig. 42
Fig. 44
Burner
Fig. 46
Inlet/Return Manifold
Baffle
Tab
11. Ease the front edge of the left hand baffle upwards,
disengaging the spring clip. Disengage the tab on the
baffle from the slot in the fan hood (Fig. 42).
12. Undo the screws securing the fan and hood to the
appliance back panel. Draw the assembly forwards
(Fig. 43).
13. 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. 44).
14. Disconnect the electrode leads and grommets from
the electrodes. Completely remove the burner (Fig. 44).
15. Brush any deposits from the injectors. Do not use a
pin or wire to clean them.
16. Brush the burner blades and venturis and clean the
combustion box.
17. Ensure that the heat exchanger fins are clear of any
obstruction.
DHW Filters (Fig. 46)
18. If the flow of domestic hot water is diminished, it
may be necessary to clean the filters.
19. Initially check the cold water inlet tap filter.
20. Turn the tap off. Undo the blanking cap and remove
the threaded bush (Fig. 45).
21. Extract the filter and rinse thoroughly in clean water.
Fig. 45
Threaded
Reassemble and check the flow. If required clean the
Bush
manifold filter as described below.
22. Undo the filter cartridge from the inlet/return
manifold.
23. Dismantle the cartridge and carefully remove the
flow regulator and filter gauze. Rinse them thoroughly in
clean water and reassemble in reverse order.
24. Check that the pressure vessel charge is 0.5bar and
reassemble in reverse order of dismantling.
Blanking Cold Water
Inlet Tap
Cap
25. Turn the selector switch fully anticlockwise against
the spring pressure to position R and hold for 2 seconds
to reset the boiler before recommissioning.
26. Complete the relevant section of the "Benchmark"
Installation, Commissioning and Service Record Log
Book and hand it back to the user.
11.0 Servicing the Boiler
11.1 Annual Servicing (Cont)
NOTE: If necessary the secondary heat exchanger
may be dismantled - see section 12.24.