33
11.0 SERVICING
11.1 Annual Servicing (Cont)
7. Undo the nut on the gas inlet pipe to the venturi
(Fig. 42) and pull the sensing pipe off the fan.
8. Disconnect the electrode leads, noting their
position, and the fan electrical plugs (Fig. 43).
9. Undo the four nuts retaining the combustion box
cover to the heat exchanger.
10. Carefully draw the fan, collector and cover
assembly forward, being careful to retain the injector
in the venturi (Figs. 42 & 43).
11. Clean any debris from the heat exchanger and
check that the gaps between the tubes are clear.
12. Inspect the burner, electrodes position and
insulation, cleaning or replacing if necessary. Clean
any dirt or dust from the air box.
13. Reassemble in reverse order.
NOTE: The sensing pipe must be reconnected to
the fan, not the venturi.
DHW Filter (Fig. 45)
14. If the flow of domestic hot water is diminished, it
may be necessary to clean the filter.
15. Initially check the cold water inlet tap filter.
16. Turn the tap off and draw off from a hot tap. Undo
the blanking cap and remove the threaded bush
(Fig. 44).
17. Extract the filter and rinse thoroughly in clean
water. Reassemble and check the flow. If required
clean the restricter filter as described below.
18. Pull off the hall effect sensor. Undo the restricter
from the inlet/return manifold.
19. Rinse the filter thoroughly in clean water and
reassemble in reverse order.
20. Turn the selector switch fully anticlockwise
against the spring pressure to the reset position and
hold for 5 seconds to reset the boiler.
21. 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. 43
Cold Water
Inlet Tap
Blanking
Cap
Threaded
Bush
Fig. 44
Fig. 42
Hall Effect
Sensor
Hydraulic
Inlet
Assembly
Fig. 45
Gas Inlet Pipe
Venturi
Injector
Restricter
Fan, Collector and
Cover Assembly
Filter
Electrode
Leads
4 ± 0.5
10 ± 1
7.5 ± 1
Electrode Position
Viewing Window
Burner
Publication No. 5116282
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