ENGLISH
27
Maintenance of the ionisation electrode
The detector electrode/ionisation probe play an important role in the boiler ignition phase
and maintaining an efficient combustion; in this regard, if it is replaced, it must always be
positioned correctly and the reference position indicated in the figure must be complied with.
detector electrode/
ionisation sensor
flame ignition
electrode
a
Do not sandpaper the electrode.
b
During the annual maintenance, check the state of wear of the electrode and replace
it if has badly deteriorated.
The removal and eventual replacement of the electrodes, including the ignition electrode,
involves also the replacement of the sealing gaskets.
In order to prevent operating faults, the detector electrode/ionisation probe should be
changed every 5 years since it is subject to wear during the ignition.
Check valve (Fig. 23)
The boiler has a check valve. To access the check valve:
-
remove the fan by unscrewing the 4 screws (
D
) fixing it to the conveyor
-
make sure there are no foreign material deposits on the membrane of the check valve
and if any remove them and checking for damage.
-
check the valve opens and closes correctly
-
re-assemble the components in reverse order, making sure the check valve is put back
in the correct direction.
When there is maintenance work on the check valve make sure that it is positioned correctly
to ensure the system operates correctly and safely.
5.25 Removing internal components
Removing the combustion unit (Fig. 22)
-
Switch off the electrical supply by turning the system’s main switch to “Off”.
-
Close the gas shut-off valve.
-
Remove the casing as indicated in the paragraph “2.12”.
-
Disconnect the connecting cables of the electrodes.
-
Disconnect the power cables of the fan.
-
Take out the clip (
A
) of the mixer.
-
Loosen the nut of the gas train (
B
).
-
Take out and turn the gas train.
-
Remove the 4 nuts (
C
) that fix the combustion unit.
-
Take out the air/gas conveyor assembly including the fan and mixer, being careful not to
damage the insulating panel and the electrodes.
-
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
-
Remove the components as described in the chapter “Removing the combustion unit”.
-
Unscrew and remove the screws fixing the electrodes.
-
The removal and eventual replacement of the electrodes, involves also the replacement
of the sealing gaskets.
-
Once the operations are finished, carefully reassemble all the components, following the
above instructions in the reverse order.
-
Always ensure that the electrodes are positioned correctly and respect the reference
position indicated in the figure (Fig. 24) (maintenance of the ionisation electrode).
-
To close the screws fixing the electrodes use a tightening torque of 2 Nm.
-
Once the operations are finished, put back all the components, following the above
instructions in the reverse order.
-
Turn the power and gas feeding to the boiler back on.
Removing the burner insulating panel
-
Remove the components as described in the chapter “Removing the combustion unit”.
-
Unscrew and remove the screws fixing the electrodes.
-
The removal and eventual replacement of the electrodes, involves also the replacement
of the sealing gaskets.
-
Remove the 4 screws fixing the burner to the conveyor and take it out together with the
gasket.
-
Remove and replace the burner insulating panel.
-
Put back the burner working in the opposite direction to what has been described,
remembering to put in the relative gasket that should be replaced.
-
To close the burner screws fixing use a tightening torque of 3.5 Nm.
-
Once the operations are finished, put back all the components, following the above
instructions in the reverse order.
-
Turn the power and gas feeding to the boiler back on.
Removing the motor of the three-way valve (Fig. 25)
-
Switch off the electrical supply by setting the system’s main switch to “off”.
-
Remove the casing as indicated in the paragraph “3.12”.
-
Remove the split pin (
A
).
-
Take out the motor (
B
).
-
Re-assemble the components in reverse order.
Removing the combustion unit (Fig. 26)
-
Switch off the electrical supply by turning the system’s main switch to “Off”.
-
Close the gas shut-off valve.
-
Remove the casing as indicated in the paragraph “3.12”.
-
Remove the 4 screws (
D
) fixing the burner to the conveyor and take it out together with
the gasket (
E
).
-
Change the burner.
-
Put back the burner working in the opposite direction to what has been described,
remembering to put in the relative gasket.
Removing the fan and the mixer (Fig. 27)
-
Remove the components as described in the chapter “Removing the combustion unit”.
-
Completely unscrew the 2 screws (
B
) and loosen the 2 screws (
C
) to extract the fan.
-
Unscrew the 3 screws (
A
) fixing the mixer to the fan and remove it.
-
To remove the check valve (
D
) fully unscrew also the 2 screws (
C
).
-
Once the operations are finished, put back all the components, following the above
instructions in the reverse order.
-
Turn the power and gas feeding to the boiler back on.
Removing the heat exchanger (Fig. 28)
-
Remove the components as described in the chapter “Removing the combustion unit”.
-
Loosen the nuts of the 2 trains (
A
and
B
).
-
Take out the clips (
C
) to remove the 2 trains (
A
and
B
) Take out the condensate drain
pipe (
D
).
-
Unscrew the 4 screws (
E
) fixing the heat exchanger to the seat.
-
Take out the heat exchanger.
-
Once the operations are finished, put back all the components, following the above
instructions in the reverse order.
-
Pay attention when inserting the trains
A
and
B
, use pliers at the base of the flaring to
prevent the inlet overtravel of the heat exchanger connections.
-
Turn the power and gas feeding to the boiler back on.
Once the operations are finished, reassemble all the components, following the above
instructions in the reverse order.
Removing the retarder insulating panel
-
Remove the components as described in the chapter “Removing the combustion unit”.
-
Protect the lower part of the coils inside the heat exchanger to prevent that during the
successive operations dust and parts of the insulating panel falling inside them.
-
THE CHARACTERISTICS OF THE MATERIAL ENSURE THAT PERSONAL
PROTECTIVE EQUIPMENT ARE NOT NEEDED BUT, FOR SAFETY REASONS, WE
RECOMMEND THE USE OF A MASK, GLOVES AND PROTECTIVE GLASSES.
-
With the help of a blade, cut the insulating panel to be replaced about 60 mm from its
circumference.
-
Lift and remove the 2 pieces of panel from the seat.
-
The panel is fixed with a clip; if, when being removed, the clip remains attached to the
relative pin, unscrew and remove it or, if damaged, with the help of pliers.
-
Vacuum out any residues on the heat exchanger coils and retarder support.
-
Place the new retarder insulating panel near the seat and insert it all the way pressing
the middle part.
-
Once the operations are finished, put back all the components, following the above
instructions in the reverse order.
-
Turn the power and gas feeding to the boiler back on.
Removing the siphon
-
Switch off the electrical supply by turning the system’s main switch to “Off”.
-
Take out the 4 silicone pipes as indicated in (Fig. 29a)
-
Take out the condensate collection pipe (Fig. 29b)
-
Unscrew the SRD device (Fig. 29c)
-
Unscrew the screw (
A
) and remove the plate (
B
) as indicated in (Fig. 29d)
-
Take out the inside part (
C
) of the siphon as indicated in (Fig. 29e)
Once the operations are finished, put back the components in the reverse order to that
described, checking the gasket and sealing OR are correctly positioned.
