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221834B
Diagram 12.3
FLUE HOOD
FLUE HOOD
SECURING SCREW (2)
4055 S
ELECTRICAL
CONNECTIONS
SECURING
SCREWS (3)
AIR
PRESSURE
TUBES
RED
TUBE
CLEAR
TUBES
4043 S
12 Servicing
Diagram 12.1
SECURING
SCREW (2)
BYPASS
HEAT SHIELD
SECURING
SCREW(2)
4054
Notes
To ensure the continued efficient and safe operation of the
boiler it is recommended that it is checked and serviced at
regular intervals. The frequency of servicing will depend upon
the particular installation and usage, but in general once a year
should be enough.
It is the Law that any servicing is carried out by a competent
person.
Note. For obtaining a products of combustion reading use the
connection on top of the boiler, see diagram 6.1.
Should the gas pressure need adjusting refer to Section 10.4.
Isolate the boiler from the electrical supply.
Before starting a service, remove the casing, refer to diagram
5.1.
Turn the gas supply off at the gas service cock, see diagram 8.1.
Unless stated otherwise, parts removed for servicing should be
replaced in the reverse order to removal.
After completing any servicing of gas carrying components,
ALWAYS test for gas soundness and carry out functional check
of controls.
Also check for condensate leaks at fan outlet/flue elbow and fan
inlet/flue hood joints.
It should be noted that the burner is water cooled and a system
drain down is necessary if the burner is removed.
12.1 Heat Exchanger Cleaning
Remove the inner case cover, see diagram 5.3.
Remove the bypass heat shield, see diagram 12.1.
Note. The flue hood top will “spring” up.
Disconnect the fan air pressure tubes, combustion sampling
tube, electrical connections and remove the three fan securing
screws, fan and the flue hood.
Note. On reassembly it is suggested that the two top securing
screws for the bypass heat shield and the flue hood be partially
engaged before fitting of the bypass heat shield, see diagram
12.3.
Carefully remove the combustion chamber front panel, see
diagram 12.4.
Remove the loose baffle from the condensing section, see
diagram 12.5.
When replacing note that it is marked “Front”.
Place a container under condense drain trap, see diagram
12.8, and remove red cap.
Flush loose debris from secondary heat exchanger with
water poured from above, and allow the water to drain
through the flexible condensate tube at the right hand side
of the heat exchanger into the container.
Check that this tube is not partially blocked and the water
runs freely.
If there is any build up of debris in the condensate trap, the
trap should be removed and flushed out.
Important: With use a white oxide coating will form on the
aluminium parts - this should only be removed if the coating is
blocking the gaps between the fins.
When cleaning take care that the water does not overflow the
condensate catchment tray.
Place a sheet of paper over the burner, see diagram 12.6.
Clean the primary heat exchanger, with a suitable soft brush,
see diagram 12.6.