32
FAMILY CX
Cleaning the primary heat exchanger (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 “3.12”.
- 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.
- Remove the siphon connecting pipe from the condensate drain fitting of
the heat exchanger and connect a temporary collecting pipe. At this point
proceed with the heat exchanger cleaning operations.
- Vacuum out any dirt residues inside the heat exchanger, being careful
NOT to damage the retarder insulating panel
- Clean the coils of the heat exchanger with a soft bristled brush.
b
DO NOT USE METAL BRUSHES THAT COULD DAMAGE THE
COMPONENTS
- Clean the spaces between the coils using 0.4 mm thick blade, also
available in a kit
- Vacuum away any residues produced by the cleaning
- Rinse with water, being careful NOT to damage the retarder insulating
panel
- Make sure the retarder insulation panel is undamaged and replace it if
necessary following the relative procedure.
- Once the cleaning operations are finished, carefully reassemble all the
components, following the above instructions in the reverse order.
- To close the fixing nuts of the air/gas conveyor assembly, use a tightening
torque of 8 Nm.
- Turn the power and gas feeding to the boiler back on.
b
If there are obstinate combustion products on the surface of the heat
exchanger, clean by spraying natural white vinegar, being careful
NOT to damage the retarder insulating panel
- Leave it to work for a few minutes
- Clean the coils of the heat exchanger with a soft bristled brush.
b
DO NOT USE METAL BRUSHES THAT COULD DAMAGE THE
COMPONENTS
- Rinse with water, being careful NOT to damage the retarder insulating
panel
- Turn the power and gas feeding to the boiler back on.
Cleaning the burner (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 “3.12”.
- 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 ceramic panel and the electrodes. At this
point proceed with the burner cleaning operations.
- Clean the burner with a soft bristled brush, being careful not to damage
the insulating panel and the electrodes.
- DO NOT USE METAL BRUSHES THAT COULD DAMAGE THE
COMPONENTS.
- Check that the burner insulating panel and the sealing gasket are
undamaged and replace them if necessary, following the relative
procedure.
- Once the cleaning operations are finished, carefully reassemble all the
components, following the above instructions in the reverse order.
- To close the fixing nuts of the air/gas conveyor assembly, use a tightening
torque of 8 Nm.
- Turn the power and gas feeding to the boiler back on.
Cleaning the siphon
- Remove the syphon as indicated in the section “Removing internal
components”.
- Clean the siphon, it can be washed with detergent water.
- Wash the SRD device making water circulate from the discharge
attachment. Never use metal or pointed tools to remove deposits or
residues inside the device, which could damage it.
- After the cleaning operations, reassemble the siphon and the SRD
device, taking care to fit the components with due care.
b
Having cleaned the siphon and the SRD device, the siphon must be
fi lled with water (see paragraph 3.14) before starting the boiler again.
At the end of the maintenance operations on the siphon and the SRD
device we recommend run the boiler in condensate regime for a few
minutes and check there are no leaks from the entire condensate
evacuation line
Maintenance of the ionisation electrode
The detector electrode/ionisation probe play an important role in the boiler
ignition phase and maintaining an effi cient combustion; in this regard, if it is
replaced, it must always be positioned correctly and the reference position
indicated in the fi gure must be complied with.
detector electrode/
ionisation sensor
fl ame 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.
