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4 MAINTENANCE AND CLEANING
Regular maintenance is an obligation required by the law and is
essential to the safety, efficiency and duration of the boiler.
Schedule maintenance in time
It allows for the reduction of consumption, polluting emissions and
keeping the product reliable over time.
Before beginning the maintenance tasks:
ƒ Turn off 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, respect the instructions giv-
en in the "1 WARNINGS AND SAFETY" chapter.
This normally means the following tasks:
ƒ removing any oxidation from the burner
ƒ removing any scale from the heat exchangers
ƒ checking electrodes
ƒ checking and cleaning the drainage pipes
ƒ checking the external appearance of the boiler
ƒ checking the ignition, switch-off and operation of the appliance,
in both domestic water mode and heating mode
ƒ checking the seal on the couplings, gas and water and conden-
sate connecting pipes
ƒ checking the gas consumption at maximum and minimum out-
put
ƒ checking the position of the ignition electrode
ƒ checking the position of the detector electrode (see specific par-
agraph)
ƒ checking the gas failure safety device
b
The use of protective clothing is recommended during the
installation of the boiler, to avoid any risk of personal injury.
b
After carrying out the necessary maintenance operations, a
flue gas analysis must be run to guarantee correct operation.
b
If, after replacing the electronic board or carrying out main-
tenance on the detection electrode or burner, the flue gas
analysis returns values outside the tolerance range, it may
be necessary to modify them as explained in paragraph "3.17
Combustion check".
NOTA: If the electrode is replace, there might be slight variations
in the combustion parameters that return within the nominal
value range after a few hours of operation.
b
Do not clean the appliance or its parts with inflammable sub-
stances (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
ƒ Disconnect the electricity supply by turning the main system
switch to OFF.
ƒ Close the gas shut-off valve.
ƒ Remove the casing as explained in paragraph "2.10 Removing
the casing".
ƒ Disconnect the connecting cables of the electrodes.
ƒ Disconnect the power cables of the fan.
ƒ Take out the clip (A) of the mixer.
ƒ Loosen the nut of the gas train (B).
ƒ Take out and rotate the gas train.
ƒ Remove the 4 nuts (C) that fix the combustion unit.
ƒ Take out the air/gas conveyor assembly including the fan and
mixer, being careful not to damage the insulating panel and the
electrodes.
ƒ Remove the siphon connecting pipe from the condensate drain
fitting of the heat exchanger and connect a temporary collect-
ing pipe. At this point proceed with the heat exchanger cleaning
operations.
ƒ Vacuum out any dirt residue inside the heat exchanger, taking
ƒ Clean the coils of the heat exchanger with a soft bristled brush.
b
ƒ Clean the spaces between the coils using a blade (0.4 mm
ƒ Vacuum away any residue produced by the cleaning interven-
ƒ Rinse with water, taking care NOT to damage the retarder insu-
ƒ Make sure the retarder insulation panel is undamaged and re-
ƒ After completing the cleaning operations, carefully reassemble
ƒ To close the fixing nuts of the air/gas conveyor assembly, use a
ƒ Turn the power and gas feeding to the boiler back on.
b
ƒ Leave it to work for a few minutes.
ƒ Clean the coils of the heat exchanger with a soft bristled brush.
b
ƒ Rinse with water, taking care NOT to damage the retarder
ƒ Turn the power and gas feeding to the boiler back on.
Cleaning the burner
ƒ Switch off the electricity supply by turning the main system
ƒ Close the gas shut-off valve.
ƒ Remove the casing as explained in paragraph "2.10 Removing
ƒ Disconnect the connecting cables of the electrodes.
ƒ Disconnect the power cables of the fan.
ƒ Take out the clip (A) of the mixer.
ƒ Loosen the nut of the gas train (B).
ƒ Take out and rotate the gas train.
ƒ Remove the 4 nuts (C) that hold the combustion unit.
ƒ Take out the air/gas conveyor assembly including the fan and
ƒ Clean the burner with a soft bristled brush, taking care not to
.
b
ƒ Check that the burner insulating panel and the sealing gasket
.
ƒ After completing the cleaning operations, carefully reassemble
ƒ To close the fixing nuts of the air/gas conveyor assembly, use a
ƒ Turn the power and gas feeding to the boiler back on.
46
care NOT to damage the retarder insulating panel.
DO NOT USE METAL BRUSHES THAT COULD DAMAGE
THE COMPONENTS
thick), also available in a kit.
tion.
lating panel.
place it if necessary following the relative procedure.
the components, following the above instructions in reverse or-
der.
tightening torque of 8 Nm.
If there are stubborn fuel gas deposits on the heat exchanger
surface, remove them by spraying with natural white vinegar,
taking care NOT to damage the retarder insulating panel.
DO NOT USE METAL BRUSHES THAT COULD DAMAGE
THE COMPONENTS
insulating panel.
switch OFF.
the casing".
mixer, being careful not to damage the ceramic panel and the
electrodes. At this point proceed with the burner cleaning oper-
ations.
damage the insulating panel and the electrodes.
DO NOT USE METAL BRUSHES THAT COULD DAMAGE
THE COMPONENTS
are undamaged and replace them if necessary, following the
relative procedure.
the components, following the above instructions in reverse or-
der.
tightening torque of 8 Nm.
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