Immergas MAIOR EOLO - Page 29

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INSTALLERUSERMAINTENANCE TECHNICIAN
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
ow temperature on the indicator (17), the power
percentage on the indicator (21) and activation
of the relative symbol .
is 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 visualised
by the relative ashing symbols or .
On completion of the checks, deactivate the
function by pressing the Reset button (5) for
8 seconds.
3.11 PUMP ANTIBLOCK FUNCTION.
e boiler has a function that starts the pump
once every 24 hours for the duration of 30
seconds in order to reduce the risk of the pump
becoming blocked due to prolonged inactivity.
3.12 THREEWAY ANTIBLOCK
FUNCTION.
e boiler is supplied with a function that ac-
tivates the motorised 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 RADIATOR ANTIFREEZE
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 standby, the function activates
every 18 hours aer the last boiler check/power
supply. In case of functioning in domestic hot
water mode the self-check starts within 10 min-
utes aer the end of the withdrawing in progress,
for duration of approx. 10 seconds.
N.B.: during self-check, the boiler remains o,
including signalling.
3.15 SOLAR PANELS COUPLING
FUNCTION.
e 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
necessary to install a mixing vale on the hy-
draulic circuit upstream from the boiler on the
cold water inlet.
Note: in order for the boiler to work properly, the
temperature selected on the solar valve must be
5°C greater than the temperature selected on the
boiler control panel.
In this condition, parameter P0 (DHW ther-
mostat) must be set at “1” and parameter P1
(solar delay time) must be set for a period that
is sucient to receive water from a storage tank
located upstream of the boiler. e greater the
distance from the storage tank, the longer the
stand-by time to be set. Once these adjustments
have been made, when the temperature of the
boiler inlet water is the same or greater than that
set by the DHW selector switch, the boiler does
not switch on.
3.16 APPLIANCE CHECK AND
MAINTENANCE.
e following checks and maintenance should
be performed at least once a year.
- Clean the ue side of the heat exchanger.
- Clean the main burner.
- Visually check the ue hood for deterioration
or corrosion.
- 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 main electrical switch posi-
tioned outside of the boiler;
- system control thermostat intervention;
- domestic hot water control thermostat inter-
vention.
- Check sealing eciency of the gas circuit and
the internal system.
- Check the intervention of the device against no
gas ionisation ame 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 drain valve
is not clogged.
- Check, aer discharging the system pressure
and bringing it to zero (read on boiler pressure
gauge), that the expansion vessel charge is at 1.0
bar.
- Check that the system static pressure (with
system cold and aer relling the system by
means of the lling cock) 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 electri-
cal system and in particular:
- supply voltage cables must be inside the
fairleads;
- there must be no traces of blackening or
burning.
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.
STD.002998/004