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

3.12 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 hydraulic circuit
upstream from the boiler on the cold water inlet.
In order for the boiler to work properly, the temper-
ature 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 thermostat)
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.

3.13 "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 (3) until
activation of the function in the absence of DHW requests.
Its activation is signalled by simultaneous flashing of the indicators
(11 and 12 Fig. 37).
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 regula-
tion" selector (6).
The central heating or DHW operating mode is displayed by the
relative symbols or
After the checks, deactivate the function switching the boiler off
and then on again.

3.14 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.

3.15 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.
56
.

3.16 RADIATORS ANTIFREEZE FUNCTION.

If the system return water is below 4°C, the boiler starts up until
reaching 42°C.
3.17 P.C.B. PERIODIC 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 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.

3.18 AUTOMATIC VENT FUNCTION.

In the case of new central heating systems and in particular mode
for floor systems, it is very important 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 D.H.W.,
120 s C.H.).
The function is activated in two different ways:
- at each new boiler power supply;
- by pressing the buttons at the same time (2 and 4 Fig. 37) for 5
seconds with the boiler in stand-by.
N.B.: if the boiler is connected to the CAR
function 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).

3.19 AIR FLOW RATE CONTROL FUNCTION.

Caution: parameter S9 is a safety value and must not be changed.
If the P.C.B. is replaced, set it to the value in the table (Ref. Par.
3.11) respecting the boiler model.
With ignition request, before the start of the fan, the condition of
the pressure switch contact is verified. If this is detected closed, the
continuation of the cycle is prevented. After a delay time of about
10 seconds, the fault "e13" is signalled: this condition persists until
the open contact has been detected.
If the detected contact is open, the fan activates at the speed "no.
of ignition consent revs". When the pressure switch is closed, the
fan speed switches to the "no. of ignition revs" and the ignition
cycle continues ignoring the pressure switch condition.
If the pressure switch does not close during operation at "no. of
ignition consent revs", after about 15 seconds the fault "e11" is
signalled: this persists until the pressure switch is closed. At the
same time, the fan speed is maintained at the "no. of ignition
consent revs".
the "stand-by"
V2