Baxi Maxflow Combi WM Installation And Servicing Instructions page 27

Sensing Electrode
Spark Electrode
Burner
Securing Screw
Injector
Fig. 47
Fig. 48
Securing Screw
Injector Manifold
Sealing Washer
Gas Supply
Reducing Valve Cartridge
Reducing Valve
10.0 Servicing the Boiler
10.1 Annual Servicing (Continued)
15. Gently clean the heat exchanger with a soft
brush, taking care not to damage any of the fins.
16. Inspect the side insulation pieces and replace
if they are damaged or deteriorated in any way
and brush out any debris or deposits from the
combustion box. Do not allow any foreign matter
to enter the gas valve pressure sensor on the
combustion box base.
17. Undo the screws securing the injector
manifold to the burner assembly and remove the
manifold. Examine the injectors for blockage,
cleaning as necessary. Do not use hard tools,
such as pins or wire (Fig. 47).
18. Clean the burner with a soft brush taking care
not to damage the electrodes. Check the
condition, positions and gaps of the electrodes.
19. The pressure reducing valve should not
require any maintenance on an annual basis, but
if problems are experienced with pressure the
cartridge should be cleaned.
Cleaning The Cartridge
20. Turn off the mains water supply. Unscrew the
cartridge from the the valve body and rinse
thoroughly in clean water (Fig. 48).
21. Check the primary system pressure vessel
charge and system pressure, and the d.h.w.
pressure vessel charge. Repressurise as
necessary.
22. Turn the heads of the temperature/pressure
relief valve, the d.h.w. pressure relief valve and
primary system pressure relief valve NOT MORE
THAN 1 / TURN to ensure that they will open and
4
reseat, and that any discharge pipework is clear.
NOTE: To test the valves as described above
it is not necessary to turn the relief valve head
"over centre" past the return cam.
23. Reassemble in reverse order of dismantling
and recommission.
24. Complete the relevant section of the
"Benchmark" Installation, Commissioning and
Service Record Log Book and hand it back to the
user.
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