Baxi 124 Combi Installation And Service Manual page 33

Flame
Sensing
Electrode
Electrode Position
Electrode
Leads
Gas Feed Pipe
Filter
Cartridge
Clip
Fig. 48
© Baxi Heating UK Ltd 2017
Spark Ignition
Electrode
Fig. 45
Fan, Collector and Cover
Assembly
Fig. 46
Securing Clip
Control Box removed
for clarity
View underneath
appliance
Inlet/Return Manifold
DHW Isolation
Cock
12.0 Servicing
12.2 Annual Servicing Inspection (Cont)
5. Remove the clip securing the gas feed pipe to the air/gas
venturi. Disconnect the pipe. Do not break the joint
between the pipe and gas valve unless necessary.
6. Disconnect the electrode leads, noting their position, and
the fan electrical plugs (Fig. 46).
7. Undo the four nuts retaining the combustion box cover
to the heat exchanger.
8. Carefully draw the fan, collector and cover assembly
forward (Figs. 46).
9. Clean any debris from the heat exchanger and check that
the gaps between the tubes are clear.
10. Inspect the burner, electrodes position and insulation,
cleaning or replacing if necessary. Clean any dirt or dust
from the air box.
11. Carefully examine all seals, insulation & gaskets, replacing
as necessary. Look for any evidence of leaks or corrosion,
and if found determine & rectify the cause.
Expansion Vessel Charge - 1.0 bar
12. To check the charge accurately ensure the system is
cold. It is also necessary to relieve the pressure by draining
the boiler. Using a suitable gauge check the pressure at the
valve on the underside of the vessel. Adjust the pressure as
required and repressurise the system.
Note: A right angled valve extension will aid checking
and repressurising.
DHW Filter (Fig. 48)
13. If the flow of domestic hot water is diminished, it may
be necessary to clean the filter. In areas of harder water it is
recommended that this is performed annually.
14. Turn the DHW isolation cock (Fig. 47) off and draw off
from a hot tap.
15. Remove the retaining clip and extract the filter cartridge
and rinse thoroughly in clean water. Reassemble and check
the flow.
16. Recommission the boiler as described in Section 10.0.
17. 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.
18. Reassemble in reverse order, ensuring the front case
panel is securely fitted.
Fig. 47
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