Three-Way Anti-Block Function; Radiators Anti-Freeze Function; Solar Panels Coupling Function; Yearly Appliance Check And Maintenance - Immergas Maior Eolo 24 4E Installation Manual

3.10 "CHIMNEY SWEEP" FUNCTION.
When activated, this function forces the boiler
to variable output for 15 minutes.
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 (5) event for
activation in the absence of DHW requests.
Its activation is signalled by the indication of the
flow temperature on the indicator(17), the power
percentage on indicator (21) and switch-on of the
relative symbol .
This function allows the technician to check the
combustion parameters.
Once the function is activated, it is possible to
select whether to make the chick in CH status
or DHW status by opening any hot water cock
and regulating the power by turning the "CH
regulation" selector (1).
Functioning in CH or DHW mode is displayed
by the relative flashing or
On completion of the checks, deactivate the
function by pressing the "Reset" button (5) for
8 seconds.
3.11 PUMP ANTI-BLOCK FUNCTION.
The boiler has a function that starts the pump
once every 24 hours for the duration of 30 se-
conds in order to reduce the risk of the pump
becoming blocked due to prolonged inactivity.
3.12 THREE-WAY ANTI-BLOCK
FUNCTION.
The boiler is supplied with a function that ac-
tivates the motorises three-way unit every 24
hours, carrying out a complete cycle in order
to reduce the risk of three-way block due to
prolonged inactivity.
3.13 RADIATORS ANTI-FREEZE
FUNCTION.
If the system return water is below 4°C, the boiler
starts up until reaching 42°C.
3.14 P.C.B. PERIODICAL SELF-CHECK.
During functioning in central heating mode or
with boiler in stand-by, the function activates
every 18 hours after the last boiler check/power
supply. In case of functioning in domestic hot wa-
ter 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,
including signalling.
3.15 SOLAR PANELS COUPLING
FUNCTION.
The boiler is set-up to receive pre-heated water
from a system of solar panels up to a maximum
temperature of 65°C. In all cases, it is always ne-
cessary to install a mixing vale on the hydraulic
circuit upstream from the boiler on the cold
water inlet.
Note: for good functioning of the boiler; the
temperature selected on the solar valve must
be 5 °C greater with respect to the temperature
selected on the boiler control panel.
In this condition, parameter P0 (DHW ther-
mostat) must be set at "1" and the parameter P1
(solar delay time) at a temperature sufficient to
receive water from a storage tank situated up-
stream from the boiler. The greater the distance
from the storage tank, the longer the stand-by
time to be set. When these regulations have been
performed, when the boiler inlet water is at the
same or greater temperature with respect to that
symbols.
set by the DHW selector switch, the boiler does
not switch on.
3.16 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.
- Visually check the flue hood for deterioration
or corrosion.
- Check correct lighting and functioning.
- Check correct calibration of the burner in
domestic hot water and central heating phases.
- Check correct functioning of control and
adjustment devices and in particular:
- the intervention of main electrical switch
positioned outside of the boiler;
- system control thermostat 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. Intervention time
must be less than 10 seconds.
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety valve drain
is not blocked.
- Check that, after discharging system pressure
and bringing it to zero (read on boiler manome-
ter), the expansion vessel factory-set pressure
is at 1.0 bar.
- 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;
- water pressure switch,
- air pressure switch.
- Check the condition and integrity of the elec-
trical system and in particular:
- electrical power cables must be inside the
whipping;
- there must be no traces of blackening or
burning.
N.B.: on occasion of periodical maintenance of
the appliance it is appropriate also to check and
perform maintenance on the central heating
system, in compliance with that indicated by the
regulations in force.
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