33
ENGLISH
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 fi nished, 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 fi nished, put back the components in the reverse
order to that described, checking the gasket and sealing OR are correctly
positioned.
