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ƒ Loosen the nut of the gas train (B).
ƒ Take out and rotate the gas train.
ƒ Remove the 4 nuts (C) that hold the combustion unit.
ƒ Take out the air/gas conveyor assembly including the
fan and mixer, being careful not to damage the insulat-
ing panel and the electrodes.
ƒ Check that the burner insulating panel and the sealing
gasket are undamaged and replace them if necessary,
following the relative procedure.
Removing the ignition electrode, the detector electrode
ƒ Remove the components as described in the chapter
"REMOVING THE COMBUSTION UNIT".
ƒ Loosen and remove the screws (W) holding the elec-
trodes.
ƒ The removal and eventual replacement of the electrodes
also involves the replacement of the sealing gaskets.
ƒ Once the operations are finished, carefully reassemble
all the components, following the above instructions in
reverse order.
ƒ Always ensure that the electrodes are positioned cor-
rectly and respect the reference position indicated in
the figure (maintenance of the ionisation electrode).
ƒ To close the screws fixing the electrodes, use a tighten-
ing torque of 2 Nm.
ƒ Once the operations are finished, put back all the
components, following the above instructions in the
reverse order.
ƒ Turn the power and gas feeding to the boiler back on.
Replacing the burner insulating panel
ƒ Remove the burner insulating panel (A) by inserting a
blade just under the surface (as shown in the figure).
ƒ Remove any residual fixing adhesive.
ƒ Fit the new burner insulating panel.
ƒ The new insulating panel does not need to be fixed
with an adhesive as its geometric form ensures perfect
coupling with the heat exchanger flange.
A
Disassembling the burner
ƒ Switch off the electricity supply by turning the main
system switch OFF.
ƒ Close the gas shut-off valve.
ƒ Remove the casing as explained in paragraph "2.10 Re-
moving the casing".
ƒ Remove the insulating panel as explained above.
ƒ Remove the 4 screws (D) fixing the burner to the convey-
or, then take it out along with the gasket (E).
ƒ Replace the burner.
ƒ Refit the burner, following the above steps in reverse
order and remembering to insert the gasket.
ƒ To close the burner screws fixing use a tightening torque
of 3.5 Nm. If the insulation panel is damaged, replace it
as described above.
ƒ After completing all the operations, reassemble all the
components, following the above steps in reverse or-
der.
ƒ Turn the power and gas feeding to the boiler back on.
Disassembling the fan and mixer
ƒ Remove the components as explained in "DISASSEMBLING
THE COMBUSTION UNIT".
ƒ Completely unscrew the 2 screws (B) and loosen the 2
screws (C) to extract the fan.
ƒ Take out the silencer by releasing it from its support.
Loosen the 3 screws (A) fixing the mixer to the fan, then
take it out.
ƒ To disassemble the check valve (D), fully loosen the 2
screws (C) as well.
ƒ Once the operations are finished, put back all the com-
W
ponents, following the above instructions in the reverse
order.
ƒ Turn the power and gas feeding to the boiler back on.
silencer
45
MAINTENANCE AND CLEANING
E
D
fixing support
C
D
B
A
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