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3.11 "CHIMNEY SWEEP" FUNCTION.
If this function is activated it takes boiler func-
tioning to the adjustable power of the central
heating selector switch.
In this state all adjustments are excluded and only
the safety thermostat and the limit thermostat
remain active. To activate the chimney sweep
function press the Reset button "C" for 8 to 15
seconds in absence of domestic hot water and
heating requests. Its activation is signalled by
the relative symbol (22 Fig. 2-1). This function
allows the technician to check the combustion
parameters. After the checks deactivate the func-
tion, switching the boiler off and then on again
using the Stand-by button.
3.12 PUMP ANTI-BLOCK FUNCTION.
The boiler features a function that starts the
pump at least once every 24 hours for 30 seconds
in order to reduce the risk of the pump becoming
blocked due to prolonged inactivity.
3.13 THREE-WAY ANTI-BLOCK
FUNCTION.
Both in "domestic hot water" and in "domestic
hot water-central heating" phase the boiler is
equipped with a function that starts the three-
way motorised group 24 hours after it was last
in operation, running it for a full cycle so as to
reduce the risk of the three-way group becoming
blocked due to prolonged inactivity.
3.14 RADIATORS ANTI-FREEZE
FUNCTION.
If the system return water is close to freezing,
the boiler starts up until it reaches a safety
temperature.
3.15 P.C.B. PERIODICAL SELF-CHECK.
During functioning in heating mode or with
boiler in standby, the function activates every 18
hours after the last boiler check/power supply. In
case of functioning in domestic hot water mode
the self-check starts within 10 minutes after the
end of the withdrawing in progress, for duration
of approx. 10 seconds.
N.B.: during self-check, the boiler remains off.
3.16 AUTOMATIC VENT FUNCTION.
In the case of new heating systems and in particu-
lar mode for floor systems, it is very important
that dearation is performed correctly. To activate
function "F8" press buttons "A and B" at the same
time (Fig. 2-1) for 5 seconds with the boiler in
stand-by. The function consists of the cyclic
activation of the pump (100 s ON, 20 s OFF)
and the 3-way valve (120 s domestic hot water,
120 s central heating). The function ends after
18 hours or by switching the boiler on using the
ignition button "
".
3.17 SOLAR PANELS COUPLING
FUNCTION.
The boiler is set-up to receive pre-heated water
from a solar panels system up to a maximum
temperature of 65 °C. If used with greater
temperatures, it is recommended to install a
mixing valve on the hydraulic circuit upstream
of the boiler. Set the "P71" function on "P71.1"
(Par. 3.9).
When the boiler inlet water is at a temperature
that is equal or greater than that set by the do-
mestic hot water selector switch "SET", the boiler
does not switch on.
3.18 YEARLY APPLIANCE CHECK AND
MAINTENANCE.
The following checks and maintenance should
be performed at least once a year.
- Clean the flue side of the heat exchanger.
- Clean the main burner.
- If deposits are detected in the combustion
chamber one must remove them and clean the
heat exchanger coils using nylon or sorghum
brushes; it is forbidden to use brushes made of
metal or other materials that may damage the
combustion chamber itself.
- Check the integrity of the insulating panels
inside the combustion chamber and if damaged
replace them.
- Visually check for water leaks or oxidation
from/on fittings and traces of condensate
residues inside the sealed chamber.
- Check contents of the condensate drain trap.
- Via the condensate drain cap check that there
are no residues of material that clog condensate
passage; also check that the entire condensate
drain circuit is clear and efficient.
In the event of obstructions (dirt, sediment,
etc.) with consequent leakage of condensate
in the combustion chamber, one must replace
the insulating panels.
- Check that the burner seal gaskets and the lid
are intact and perfectly efficient, otherwise
replace them. In any case the gaskets must be
replaced at least every two years, regardless of
their state of wear.
- Check that the burner is intact, that it has no
deformations or cuts and that it is properly
fixed to the combustion chamber lid; otherwise
it must be replaced.
- Visually check that the water safety drain valve
is not clogged.
- Check that, after discharging system pressure
and bringing it to zero (read on boiler pressure
gauge), the expansion vessel pressure is at 1.0
bar.
38
- Check that the system static pressure (with
system cold and after refilling the system by
means of the filling valve) is between 1 and 1.2
bar.
- Visually check that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- Check the condition and integrity of the electri-
cal system and in particular:
- supply voltage cables must be inside the
fairleads;
- there must be no traces of blackening or
burning.
- Check ignition and operation.
- Check correct calibration of the burner in
domestic hot water and central heating phases.
- Check the operation of the appliance control
and adjustment devices and in particular:
- intervention of the main electrical switch on
the boiler;
- system regulation probes intervention;
- domestic hot water control thermostat inter-
vention.
- Check sealing efficiency of the gas circuit and
the internal system.
- Check the intervention of the device against
no gas ionisation flame control. The relative
intervention time must be less than 10 seconds.
N.B.: in addition to yearly maintenance, one
must also check the thermal system, with fre-
quency and procedures that comply with the
indications of the technical regulations in force.
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