Immergas 3.028358, Instructions And Recommendations

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3.14 SOLAR PANELS COUPLING FUNCTION
The boiler is prepared to receive pre-heated water from a system of
solar panels up to a maximum temperature of 65°C. In any case, it
is always necessary to install a mixing valve on the hydraulic cir-
cuit upstream of the boiler, on the cold water inlet.
For good functioning of the boiler; the temperature se-
lected on the solar valve must be 5 °C greater with respect
to the temperature selected on the boiler control panel.
In this condition, parameter t2 (DHW thermostat) must be set at
“1” and parameter t3 (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.
3.15 "CHIMNEY SWEEP” FUNCTION
When activated, this function forces the boiler to variable output
for 15 minutes.
In this state, all adjustments are excluded and the safety thermo-
stat and the limit thermostat functions remain active. To activate
the chimney sweep function, press the “ ” button until acti-
vation of the function in the absence of DHW requests.
Its activation on the boiler display is confirmed by the indicators
flashing at the same time ( , ), while on the CAR
V2
(optional)
it is reported as “ERR>07”.
This function allows the technician to check the combustion pa-
rameters.
Once the function is activated, it is possible to select whether to
make the check in C.H. status or D.H.W. status by opening any hot
water cock adjusting the power via the buttons ( ).
The maximum power than can be supplied (99 %) is relative to the
power set by parameter “P2” (Par. 13).
The central heating or D.H.W. operating mode is displayed by the
relative symbols or .
After the checks, deactivate the function by switching the boiler
off and starting it again using “ ”.
The boiler needs a certain amount of time to stabilise it-
self before carrying out a combustion parameters check.
It is thus necessary to wait for the boiler to carry out a
self-diagnosis test, which is signalled by the ( ) flash-
ing symbol. Once the symbol stops flashing, it is possible
to check the combustion parameters.
3.16 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.
3.17 THREE-WAY ANTI-BLOCK SYSTEM
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 opera-
tion, running it for a full cycle so as to reduce the risk of the three-
way group becoming blocked due to prolonged inactivity.
3.18 RADIATORS ANTIFREEZE FUNCTION
If the system return water is below 4°C, the boiler starts up until
reaching 42°C.
3.19 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 water
mode the self-check starts within 10 minutes after the end of the
withdrawing in progress, for duration of approx. 10 seconds.
During the self-check the boiler remains inactive. Noti-
fications included.
3.20 AUTOMATIC VENTING FUNCTION
In the case of new central heating systems and in particular mode
for floor systems, it is very important that deaeration 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 by pressing buttons “ ” + “ ” at
the same time for 5 seconds with boiler in stand-by.
If the boiler is connected to the CAR
V2
the “stand-by” func-
tion can only be activated via the remote control panel.
The function lasts for 18 hours and it can be stopped by simply
pressing the button “ ”.
Activation of the function is signalled by the countdown shown
on the indicator ( ).