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7.3
CLEANING THE PRIMARY HEAT
EXCHANGER
- Refer to 7.9 and carry out the component removal procedure
- Remove the casing as indicated in the paragraph "7.10 CA-
SING REMOVAL ("Fig. 25")" .
- Disconnect the connecting cables of the electrodes.
- Disconnect the power cables of the fan.
- Remove the combustion unit as described in "7.22 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 retar-
der 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 reas-
semble all the components, following the above instruc-
tions 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 vi-
negar, 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 retar-
der insulating panel
- Turn the power and gas feeding to the boiler back on.
7.4
CLEANING THE BURNER
Refer to 7.9 and carry out the component removal procedure
- Remove the casing as indicated in the paragraph "7.10 CA-
SING REMOVAL ("Fig. 25")" .
- Disconnect the connecting cables of the electrodes.
- Disconnect the power cables of the fan.
- Remove the combustion unit as described in "7.22 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 ope-
rations.
- 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 reassem-
ble 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.
7.5
CLEANING THE SIPHON
Remove the syphon as indicated in the section "Removing
the siphon".
- Clean the siphon, it can be washed with detergent water.
- Wash the SRD device making water circulate from the dischar-
ge attachment. Never use metal or pointed tools to remove
32
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 filled with water 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 con-
densate regime for a few minutes and check there are no
leaks from the entire condensate evacuation line.
7.6
ELECTRODES VERIFICATION
The electrodes play an important role in the boiler ignition phase;
in this regard, if they are replaced, they must always be positio-
ned correctly and the reference position indicated in the figure
must be complied with.
detector electrode/
ionisation sensor
Fig. 23
a
Do not sandpaper the electrodes.
b
During the annual maintenance, check the state of wear of
the electrodes and replace them if have badly deteriorated.
The removal and eventual replacement of the electrodes involves
also the replacement of the sealing gaskets.
7.7
CLAPET
Refer to 7.9 and carry out the component removal procedure.
The boiler has a check valve.(clapet)
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 mem-
brane 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 cor-
rectly and safely.
Fig. 24
flame ignition
electrode
D
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