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221469B
2.1 Pilot Check
Check if the pilot flame is burning correctly and of the correct
size, see diagram 4.4. If the pilot flame is not correct, the pilot
injector will require removing when accessible.
2.2 Isolation and Access
Before starting, refer to Section 1.1.
Isolate the boiler from the electrical supply and close the gas
service cock, refer to Section 1.3.
Remove the outer case and the cover of the inner case, refer to
Sections 1.4 and 1.5.
Remove the fan from the flue collector, refer to Section 4.1
Remove the flue collector, secured with two screws.
Remove the main burner, refer to Section 4.2.
2.3 Cleaning the Heat Exchanger
Place a sheet of paper in the combustion chamber to cover the
injector and pilot assembly, to collect any debris.
Brush the heat exchanger.
Remove the paper together with any debris.
Do not use a brush with metal bristles.
2.4 Cleaning the Main Burner
Use a vacuum cleaner or suitable brush to clean the burner
thoroughly, making sure that all the burner ports are not
obstructed.
Do not use a brush with metal bristles.
2.5 Cleaning the Pilot Injector
If the pilot flame was not burning correctly, it is necessary to
remove the pilot injector, refer to Section 4.5.
Inspect the injector and clean if necessary, by blowing clear
only.
Do not use a wire or sharp instrument.
2.6 Service Checks
Inspect the pilot burner, spark electrode, adapter olive on the
pilot tube and thermocouple. Clean if necessary or renew, refer
to Section 4.4, 4.5 and 4.6.
Check the main injector, cleaning or renewing as necessary,
refer to Section 4.3.
Before replacing any parts removed during servicing, inspect
the condition of all seals and joints, renewing as necessary.
Check the condition of the combustion chamber insulation.If
renewing, refer to Section 4.30.
Check the spark gap, upon assembly, see diagram 4.4.
2.7 Initial Assembly
Assemble the following parts only, in the reverse order of
removal.
Make sure that the main burner is located on the main injector
and is horizontal, the tips of the rearmost blade under the two
burner guides.
The combustion chamber front panel should be fitted loosely,
then the flue collector also fitted loosely, ensuring that it is
seated correctly on the heat exchanger and over the top edge
of the front panel.
Fit the fan, locate it into the flue elbow and the clip at the rear,
then secure with the two screws.
Connect the electrical cables to the fan, the polarity of the two
connectors is not important.
Secure the flue collector and combustion chamber front panel
by tightening the wing nut and screws evenly.
2.8 Operational Checks
Check the safety valve manually by turning the knob in the
direction of the arrow.
Light the boiler, carry out operational checks and any necessary
adjustments as described in Commissioning in the Installation
Instructions.
2.9 Completion
Hook the outer case on the top and secure with the screws
previously removed, see diagram 6.1 installation section.
2 Servicing
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