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English
• ANTIFREEZE FUNCTION
• With Integrated Modulating Electric Heater
In the event that the unit is installed in a cold climate
(outdoor winter design temperature lower than -5°C),
we recommend the use of versions with an electric
antifreeze resistance on the external air intake circuit
(ENY - SER/SEL/SPER/SPEL MODELS).
The electric heaters available for units preheat the
supply air entering the heat exchanger in order to
prevent the freezing of the humid air extracted and
discharged by the heat exchanger in the opposite
circuit.
In fact, when the external air drops below the
critical temperature, posing the risk of freezing of
the discharged air, the resistance is activated and
supplies the minimum heat output such that the
temperature of the discharged air is kept above
freezing conditions (set point 4°C).
The electric heaters are selected in order to main-
tain the minimum conditions of indoor comfort at
outdoor temperatures down to -10°C, and in order
to avoid the degenerative formation of ice upon
discharge down to -15°C outside.
The electric heater is fitted with a safety thermostat
that turns off the unit in case of uncontrolled heat-
ing. In case the resistance does not start up, instead,
the unit will turn off if the supply air temperature
falls below 5°C.
Activation of the resistance as a result of the anti-
freeze function is represented by the icon
.
The operating logics and alarm signals are shown in
the table at the end of the chapter on ANTI-FREEZE
FUNCTIONS.
• BOOSTER MODE
• FIREPLACE FUNCTION
• BOILER FUNCTION
Like for “Party Mode”, “Booster Mode” determines an in-
crease in the timed speed respect to the nominal speed.
The percentage of the duration and of the speed in-
crease of the ventilation unit can be configured by the
installer upon a specific request of the user.
The standard duration is 3 hours (default) and the
standard percentage is 130% beyond the nominal
speed.
Booster mode can be stopped at any time before the
end of the set time.
Simply repeat the command with which it was
enabled.
This is enabled by a remote control normally located
in a bathroom or kitchen.
The power board of the centralised unit receives the
pulse from the outside and enables the “Booster Mode”.
In this case the “Boost” icon appears as a notification
on the screen of the unit’s control panel.
If the unit is interfaced with a negative pressure am-
bient pressure switch and is set in the DIP-SWITCH
configuration recommended in presence of a natural
draught chimney, the unit is automatically turned off
when the ignition of the fireplace causes negative
pressure in the room.
This occurs in order to prevent the ambient pressure
induced by the action of the dual flow ventilation
unit from counteracting the natural draught of the
fireplace and releasing smoke into the room.
If the unit is interfaced with a remote switch and is
set in the DIP-SWITCH configuration recommended in
presence of an atmospheric boiler, the unit is forced
into a strong imbalance supply mode in order to
facilitate the ignition of the boiler.
The mode remains active as long as the switch stays
in the activation position.
OPERATING LOGICS
DAY
°C
DAY
°C
P
AUTO
