FAMILY
26
A
B
C
SERVICE
BOILER TYPE
BOILER TYPE
Family 25 KIS
A
Family 30 KIS
B
Family 35 KIS
C
-
Select COMBUSTION OFFSET
.
RESET
RESTORE
SERVICE
COMBUSTION OFFSET
RESTORE
: select this option when replacing the MAIN PCB electronic board
RESET
: select this option when replacing the detector electrode or on the burner
b
If after maintenance work on the elements of the combustion unit (Repositioning
the detector electrode or else replacing/cleaning the primary heat exchanger,
condensate siphon, fan, burner, flue gases conveyor, gas valve, gas valve
diaphragm), the boiler generates one or more alarms regarding combustion faults,
we recommend setting the main system switch to off for at least 5 minutes in these
cases we recommend setting the main system switch to off for at least 5 minutes.
5.24 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
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 “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 (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 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.
-
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.
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 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 filled 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.
