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EXCLUSIVE X
COMBUSTION SELF-CALIBRATION
Function used by the after sales service to make an automatic combustion bend correction if
the CO
values (shown in the technical data) are outside the permitted range.
2
- Power the boiler electrically by bringing the main switch to "ON".
- Set the boiler status to OFF.
- Select TECHNICAL
COMBUSTION CONTROL
- Set the values to:
RESTORE = use the old bend (if the CO
RESET = use the new bend (if the CO
This parameter is only available when the system is OFF.
4.25
Maintenance and cleaning
Periodic maintenance is an "obligation" required by the law and is essential to the safety,
efficiency and duration of the boiler. It allows for the reduction of consumption, polluting
emissions and keeping the product reliable over time. Before starting maintenance
operations:
- close the fuel and water taps of the heating and domestic hot water system.
To ensure product characteristics and efficiency remain intact and to comply with
prescriptions of current regulations, it is necessary to render the appliance to systematic
checks at regular intervals. When carrying out maintenance work, observe the instructions
given in the "WARNINGS AND SAFETY" chapter. This normally means the following tasks:
- removing any oxidation from the burner
- removing any scale from the heat exchangers
- checking electrodes
- checking and cleaning the drainage pipes
- checking the external appearance of the boiler
- checking the ignition, switch-off and operation of the appliance, in both domestic water
mode and heating mode
- checking the seal on the couplings, gas and water and condensate connecting pipes
- checking the gas consumption at maximum and minimum output
- checking the position of the ignition electrode
- checking the position of the detector electrode/ionisation probe (see specific paragraph)
- checking the gas failure safety device.
b
During boiler maintenance the use of protective clothing is recommended, in order
to avoid personal injury.
b
After carrying out the maintenance operations the analysis of the combustion
products needs to be carried out to make sure it is operating correctly.
b
If, after replacing the electronic board or having carried out maintenance on the
detector electrode or the burner, the analysis of the combustion products returns
values outside tolerances, it might necessary to change these values as described
in the section "4.24 Combustion Control Parameters".
Note: When replacing the electrode there could be slight variations of the
combustion parameters that fall within nominal values after a few hours of
operation.
b
Do not clean the appliance or its parts with inflammable substances (e.g. petrol,
alcohol, etc.).
b
Do not clean panels, painted parts and plastic parts with paint thinner.
b
Panel cleaning must be carried out only with soapy water.
Cleaning the primary heat exchanger and the burner
- 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 "2.6 Removing the casing".
- 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 uni.t
- Take out the air/gas conveyor assembly including the fan and mixer, being careful not to
damage the insulating panel and the electrodes.
Primary heat exchanger
- 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.
20
SELF-CALIBRATION
value is too high)
2
value is too low).
2
B
C
A
- 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.
- Once the operations have been completed, reassemble the components by operating
in the reverse order to what is described.
Burner
- 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.
b
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 air filter
- Unscrew the fixing screw A and remove the air filter.
- Blow compressed air on the filter to remove any impurities.
- In case of persistent dirt wash with water.
25kW
25kW
A
35-40kW
30-35-40kW
A
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