Main Combi 30 HE Installation & Service Instructions Manual page 28

Fan and Hood
Assembly
Fig. 43
Electrode
Grommets
Burner
Cartridge
Body
Filter Gauze
Flow
Regulator
Venturi
28
Baffle
Spring Clip
Threaded
Bush
Fig. 44
Blanking
Fig. 46
Inlet/Return Manifold
11.0 SERVICING
Tab
11.1
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).
Fig. 42
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.
NOTE: If necessary the secondary heat exchanger
may be dismantled - see section 12.24.
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.
Fig. 45
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. Reassemble and check the flow. If required
clean the manifold filter as described below.
22. Undo the filter cartridge from the inlet/return
manifold.
23. Dismantle the cartridge and carefully remove the
Cold Water
flow regulator and filter gauze. Rinse them thoroughly
Inlet Tap
Cap
in clean water and reassemble in reverse order.
24. Check that the pressure vessel charge is 0.5bar,
reassemble in reverse order of dismantling and
recommission.
25. Turn the selector switch fully anticlockwise against
the spring pressure to the reset position and hold for 2
seconds to reset the boiler.
26. Complete the relevant Service Interval Record
section of the Benchmark Commissioning Checklist at
the rear of this publication and then hand it back to the
user.
Annual Servicing (Cont)