MODEINFORESET
+
-
+
-
Fig. 6.19
In the case of new heating systems and especially for underfloor
heating systems, it is very important that the air is properly vented.
The function consists in the cyclical activation of the pump and of the
diverter valve (in both DHW and CH positions).
As default, the function is activated automatically each time the
boiler is powered up and it last for 10 minutes. This automatic
activation can be disabled by setting parameter A.8 = 0.
The function can also be activated manually by entering the special
functions as described in Section 6.15 and selecting 'dI'. In this case
it has a duration of 16.5 hours.
Following activation, the indication 'dI' appears on the DHW digits
and the value of the time remaining to the end of the function in tens
of minutes on the heating digits.
The display of the 'radiator' or 'tap' symbols indicates whether the
function is active in DHW or Heating mode.
At the end of the boiler function it automatically returns to the
starting state.
The flashing 'RESET' symbol indicates that the function can be
terminated early using the relevant key.
6.18 AUTOMATIC VENT FUNCTION (DI)
Alpha E-Tec Plus 28NX, 33NX and 38NX - Commissioning
To activate the 'Flue' function, access the special functions as described in Section 6.15 and select the 'FU' function.
Before performing the test, ensure that the condensate drain trap has been filled correctly and check that there
are no obstruction in the air intake and flue exhaust circuits and that the sealed chamber is perfectley closed and
the flue system has already been installed.
Using this function activates the fan at a fixed speed (5500 rpm) for 15 minutes.
Once activated, the display shows 'FU' and the fan speed in rpm x 100. It is possible to exit the function by pressing the
RESET button.
6.19 FLUE INSTALLATION FUNCTION (FU)
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 any
case, it is always necessary to install a mixing valve in the hydraulic circuit upstream of the boiler in the cold water inlet.
This function is activated when the parameter P.15 is set at “1” and the boiler detects a probe on the domestic hot water inlet
(optional) or if the 'Solar ignition delay' parameter (t.3) is more than 0 seconds.
When there is a demand for hot water and the inlet water is hot enough or if there is 'Solar ignition delay' time, the boiler does
not switch on, the domestic hot water symbol (
) appears on the display along with the flashing solar function symbol ( ).
When the water supplied by the solar system is at a temperature lower than what is set, or if the 'Solar ignition delay' time
has elapsed, the boiler switches on. At this point, the solar function symbol ( ) remains permanently on.
For good functioning of the boiler, the temperature selected in the mixing valve must be 5°C greater with respect to
the DHW temperature selected via the boiler control panel.
6.20 SOLAR PANELS COUPLING FUNCTION
The boiler has a function that starts up the pump at least once every 24 hours for 30 seconds in order to reduce the risk of
the pump locking up due to prolonged inactivity.
This function can be deactivated via parameter 'P.8' with the boiler on Off/Standy-by.
6.21 PUMP ANTI-BLOCK FUNCTION
Both in DHW and DHW + CH phase the boiler is eqipped 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.
This function can be deactivated via parameter 'P.8' with the boiler on Off/Standy-by.
6.22 THREE-WAY ANTI-BLOCK FUNCTION
If the boiler sensors detect a temperature below 4°C, the boiler starts up until reaching 42°C.
This function can be deactivated via parameter 'P.8' with the boiler on Off/Standy-by.
6.23 ANTIFREEZE FUNCTION
48
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