4.0 Options
blown into the room. The ventilation system will usually
heat the outdoor air up to a temperature that is close to
room temperature so the water-based afterheating surface
is only used to give the supply temperature a little lift.
100% stepless control is carried out via the built-in motor
valve.
The required supply temperature can be set from the Air
Dial in Main menu > Settings > Temperature > Supply
The afterheating surface can also in special cases be used
as total heating in passive or 0 energy houses if all parts of
the system have been dimensioned for it. If this setting is
selected, the required room temperature can be set in the
main menu.
Geothermal preheating/cooling
Supply air
to room
Extraction air
from room
Exhaust
±
Outdoor
air
Pump
The geothermal surface is able either to preheat or precool
the outside air depending on the season. The control
automatically determines what is required and controls the
surface in and out of operation as required. The geothermal
surface is provided with ‘anti-freeze’ (brine) which is circu-
lated in a buried ground pipe using a circulation pump. This
means that it is ‘free renewable energy’ that can be used
with a clean conscience.
In the winter, preheat can be used to prevent the system
from going into frost protection mode and in the summer
it can provide pleasant additional cooling by cooling the air
before it reaches the system. When the geothermal surface
is cooling, the ventilation system’s bypass of course opens
automatically.
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