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27 SERVICING
Caradon Plumbing Limited does not accept any liability
resulting from the use of unauthorised parts or the repair
and servicing of appliances not carried out in accordance
with the Company's recommendations and specifications.
A comprehensive service should be carried out at least
once a year. The User is advised to make a contract with
the local Gas Region or a CORGI registered heating
installer.
WARNING. ALWAYS turn OFF the gas supply at the gas
cock and switch OFF and disconnect the electricity supply
to the appliance BEFORE SERVICING OR REPLACING
ANY COMPONENTS.
CLEANING THE BOILER. Refer to Frame 5
Pull and lift off the lower front panel and top panel from
the boiler casing.
Unscrew the extended nuts at the top of the NOx
duct behind the control box and lift the NOx duct
clear of the burners as illustrated below.
Undo the 4 wing nuts securing the burner front
plate. Pull the front plate forwards, at the top,
and lift it out - taking care not to damage the
insulation.
The centre and RH burners can be lifted out
after they have been pushed back to clear the
injector.
To remove LH burner the pilot gas pipe
connection at the gas valve must be removed.
The LH burner may now be removed by
pushing it back to clear the injector and lifting it
out. To remove it away from the boiler, the flame
detector lead and spark lead must be
disconnected in the control box.
20
SERVICING
Remove the 2 screws securing the control box door, lift it
and carefully drop it down. Pull off the flame detector lead
and the spark electrode lead connections from the
S4561B1054 PCB (the left hand board). Undo the strain
relief clamp and feed the sleeved leads out of the box. The
burner can now be fully removed from the boiler.
Undo the screws securing the clean out cover and lift it off to
give access to the flue ways. Lift out the flue baffles. (Not
fitted to the CXA 110 or 120 boiler).
Remove all loose deposits from the heat exchanger,
especially from between the fins, using the brush provided,
and remove all debris from the combustion chamber floor.
Examine the burner assembly. Clean the burner bars by
brushing them down with a stiff bristle (not wire) brush.
Check each bar carefully to ensure that all flame ports are
clear, that there are no cracks and that all surfaces are free
from accumulated deposits.
If available, an industrial vacuum cleaner may be useful to
assist in this work. When cleaning the burner bars, take
care to avoid damage from rough handling to the pilot pipe,
electrodes and leads.
Inspect the pilot burner, injector, ignition electrode, and
flame detector electrode.
Ensure that they are clean and in good condition.
In particular, check that:
1.
The pilot burner is firmly secured.
2.
The pilot shield is clean and correctly positioned.
(Not fitted to the CXA 120 boiler).
3.
The ignition electrode and lead are clean,
undamaged, secure and correctly dimensioned.
Refer to diagram in Frame 28.
4.
The flame detector electrode and lead is clean,
undamaged, secure and correctly dimensioned.
Refer to Frame 28.
5.
The pilot burner head is clean and undamaged.
Note. Casing omitted for clarity
Concord CXA
- Installation and Servicing
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