Service and maintenance
Bypass function
When the current room temperature exceeds the desired temperature, heat recovery is no longer
necessary. The bypass will then open up and lead the outdoor air past the heat exchanger, so it does
not get heated by the indoor air. This results in lower internal pressure in the unit and you thereby save
energy on fan operation.
The unit has a 100% bypass, which means that the outdoor air is led around the exchanger while,
simultaneously, a damper closes the heat exchanger, preventing any outdoor air from passing through
it.
Humidity control
As a standard the unit is fitted with an intelligent humidity control system that automatically adjusts to
the requirements of the family or the building.
By means of the integral humidity sensor, the control system calculates the average level for the
previous 24 hours. The average level determines whether fluctuations in the air humidity in the extract
air make it necessary to alter the air exchange. At the same time it adjusts to the air humidity levels of
summer and winter.
If the air humidity increases by more than 5-10% (summer/winter), forced ventilation is activated in
order to lower the humidity level as quickly as possible. If the average air humidity falls below the set
level for low humidity (set default at 30%), the unit will reduce operation and air exchange rate, in order
not to dehumidify the dwelling further.
The automatic humidity control system saves energy on operation and helps ensure a comfortable
dwelling.
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