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12.0 Servicing the Boiler - Page 27
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.
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 removing the sample point
2
screw on the flue elbow (Fig. 38) and inserting a suitable
sampling probe. If the CO/CO
more 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. 39).
8. Disconnect the three lead terminals from the combustion box
door taking note of their positions (Fig. 39).
9. Undo the four screws securing the combustion box door and
remove the door (Fig. 40).
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
d)
Insulation.
e)
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.
NOTE: General cleaning can be undertaken using a
vacuum. However debris should only be gently blown off
the burner skin due to its fragile nature.
11. Check system pressure is between 1 and 2.5 bar.
ratio is greater than 0.02 then a
2
(check also for condensate leaks)
.
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