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12.0 Servicing the Boiler – page 26
12.1
Annual Servicing
IMPORTANT: When servicing ensure that both the gas and
electrical supplies to the boiler are isolated before any work
is started.
When the boiler control knob is switched off the control
PCB remains live. Therefore it is important to isolate the
electrical supply.
Hazardous materials are not used in the construction of
Baxi products, however reasonable care during service is
recommended.
When replacing the combustion box door after servicing it is
essential that the retaining screws are tightened fully.
1.
For reasons of safety and economy, it is recommended
that the boiler is serviced annually. Before servicing
please read Section 1.2 Important Information.
2.
After servicing, complete the relevant section of the
"Benchmark" Installation, Commissioning and Service
Record Log Book. This should be in the possession of
the user.
3.
If it is intended to undertake a flue gas analysis as part
of the service, then whilst the boiler is running measure
the CO and CO
content of the flue products, by
2
removing the sample point screw on the flue elbow
(Fig. 39) and inserting a suitable sampling probe. If the
CO/CO
ratio is greater than 0.02 then a more
2
extensive service and investigation will be required. If
the CO/CO
ratio is less than 0.02 proceed as follows:
2
4.
Ensure that the boiler is cool.
5.
Ensure that both the gas and electrical supplies to
the boiler are isolated.
6.
Remove the outercase and lower door panel (see
Fitting the Outercase, Section 11.0).
7.
Release the four ¼ turn screws securing the air box
door panel and remove the door (Fig. 40).
8.
Disconnect the leads from the centre and right hand
terminals (earth and flame sensing probe). The spark
electrode lead is permanently fixed to the electrode.
Undo the re-usable cable tie and pull down the sleeving
to expose the joint in the electrode lead. Disconnect the
lead (Fig. 41a).
9.
Undo the four screws securing the combustion box
door and remove the door (Fig. 41).
10. Visually check for debris/damage and clean or replace
if necessary the following:
a)
Burner (Fragile - handle with care).
b)
Heat exchanger fins.
c)
Fan compartment (check also for condensate leaks)
d)
Insulation
e)
Door seals-Important: Pay particular attention to the
condition of the combustion box door seals.
f)
Electrodes
g)
Check condensate trap for debris. NOTE: If necessary
remove the trap drain plug and place a vessel
underneath to catch the condensate (care should be
taken as this could be hot). Clean the trap and refit the
drain plug.
h)
Top of heat exchanger
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