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POWER EVO-X 65 - 80
To access the check valve:
ƒ remove the fan by unscrewing the 4 screws (D) fixing it to the
conveyor
ƒ make sure there are no foreign material deposits on the mem-
brane of the check valve and if any remove them and checking
for damage.
ƒ check the valve opens and closes correctly
ƒ re-assemble the components in reverse order, making sure the
check valve is put back in the correct direction.
If maintenance has been carried out on the check valve, make sure
it is correctly repositioned to ensure the system operates properly
and safely.
Disassembling the internal components
4.1
Disassembling the air-gas conveyor
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 Removing
the casing".
ƒ Disconnect the connecting cables of the electrodes.
ƒ Disconnect the power cables of the fan.
ƒ Take out the clip (A) of the mixer.
ƒ Loosen the nut of the gas train (B).
ƒ Take out and rotate the gas train.
ƒ Remove the 4 nuts (B) that hold the combustion unit.
ƒ Take out the air/gas conveyor assembly including the fan and
mixer, being careful not to damage the insulating 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 "REMOV-
ING THE COMBUSTION UNIT".
ƒ Loosen and remove the screws (W) holding the electrodes.
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 correctly and
respect the reference position indicated in the figure (mainte-
nance of the ionisation electrode).
ƒ To close the screws fixing the electrodes, use a tightening
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.
D
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 Removing
the casing".
ƒ Remove the insulating panel as explained above.
ƒ Remove the 4 screws (D) fixing the burner to the conveyor, 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 compo-
nents, following the above steps in reverse order.
ƒ Turn the power and gas feeding to the boiler back on.
POWER EVO-X 50 DEP - 50
D
48
W
E
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