Solar Panels Coupling Function; Chimney Sweep'' Function; Pump Anti-Block Function; Three-Way Anti-Block Function - Immergas VICTRIX EXA 28 1 ERP Instruction And Recommendation Booklet

3.9 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
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 sufficient to receive water from a storage tank
located upstream of the boiler. The 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.

3.10 ''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 ther-
mostat remain active. To activate the chimney
sweep function, press the "Reset" button (3)
until activation of the function in the absence
of DHW requests.
Its activation is signalled by simultaneous flash-
ing of the indicators (11 and 12 Fig. 2-1).
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 (6).
The central heating or DHW operating mode is
displayed by the relative symbols
After the checks, deactivate the function switch-
ing the boiler off and then on again.

3.11 PUMP ANTI-BLOCK FUNCTION.

The boiler has a function that starts the pump at
least 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.
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.
3.13 RADIATORS 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 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.

3.15 AUTOMATIC VENT FUNCTION.

In the case of new central heating systems and in
particular mode for floor systems, it is very im-
portant that dearation is performed correctly. 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 is activated in two different ways:
- every time the boiler is powered;
- by pressing the buttons at the same time (2
and 4 Fig. 2-1) for 5 seconds with the boiler in
stand-by.
IMPORTANT NOTE: if the boiler is con-
nected to the CAR
can only be activated via the remote control
panel.
In the first case, the function has duration of 8
minutes and it can be interrupted by pressing
the "reset" button (4). In the second case it has
duration of 18 hours and it can be interrupted by
simply switching the boiler on.
Activation of the function is signalled by the
countdown shown on the indicator (14).
3.16 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.
or .
- 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.
- Check that the system static pressure (with sys-
tem cold and after refilling the system by means
of the filling 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;
- Check the condition and integrity of the electri-
cal system and in particular:
V2 the "stand-by" function
- supply voltage cables must be inside the
- there must be no traces of blackening or
- 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:
- system regulation probes intervention;
- domestic hot water control thermostat inter-
- 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.
IMPORTANT NOTE: in addition to yearly
maintenance, you must also check the thermal
system and energy efficiency, with the frequency
and procedures that comply with the technical
regulations in force.
31
fairleads;
burning.
vention.