38
13.0 Servicing
© Baxi Heating UK Ltd 2009
13.1
Annual Servicing (Cont)
9. Undo the nut on the gas inlet pipe to the venturi (Fig. 65)
and pull the sensing pipe off the fan.
10. Disconnect the electrode leads, noting their position,
and the fan electrical plugs (Fig. 66).
11. Undo the four nuts retaining the combustion box cover
to the heat exchanger.
12. Carefully draw the fan, collector and cover assembly
forward, being careful to retain the injector in the venturi
(Figs. 65 & 66).
13. Clean any debris from the heat exchanger and check
that the gaps between the tubes are clear.
14. Inspect the burner, electrodes position and insulation,
cleaning or replacing if necessary. Clean any dirt or dust
from the air box.
15. Reassemble in reverse order.
NOTE:
The sensing pipe must be reconnected to the
fan, not the venturi.
DHW Filter
(Fig. 68)
16. If the flow of domestic hot water is diminished, it may
be necessary to clean the filter.
17. Initially check the cold water inlet tap filter.
18. Turn the tap off and draw off from a hot tap. Undo the
blanking cap and remove the threaded bush (Fig. 67).
19. Extract the filter and rinse thoroughly in clean water.
Reassemble and check the flow. If required clean the
restricter filter as described below.
20. Pull off the hall effect sensor. Undo the restricter from
the inlet/return manifold.
21. Rinse the filter thoroughly in clean water and reassemble
in reverse order.
22. Turn the selector switch fully anticlockwise against the
spring pressure to the reset position and hold for 5 seconds
to reset the boiler.
23. 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.
Fig. 66
Cold Water
Inlet Tap
Blanking
Cap
Threaded
Bush
Fig. 67
Fig. 65
Hall Effect
Sensor
Hydraulic Inlet
Assembly
Fig. 68
Gas Inlet Pipe
Venturi
Injector
Restrictor
(not on 40 models)
Fan, Collector and Cover
Assembly
Filter
Electrode
Leads
4 ± 0.5
10 ± 1
7.5 ± 1
Electrode Position
Viewing Window
Burner
