Air humidity
The primary purpose of ventilation is to extract humidity from the house so it does not damage the
building, and to achieve a good indoor climate. During long periods with sub-zero temperatures, air
humidity in the house may fall to a level that is critical for the building and for the indoor climate.
Wooden floors, furniture and walls can be damaged by very dry air, which also whirls up dust, resulting
in a poor indoor climate.
This is rectified by an integrated humidity control system that maintains good, relative air humidity.
When the average air humidity in the house falls below a set level (default set at 30%), ventilation may
be reduced. It will typically only be for a short period of time. This will help avoid further reduction of
the air humidity in the house.
The humidity control system also has a function that allows increased ventilation, should the air
humidity increase, for instance when having a bath. The risk of mould growth in the bathroom is
reduced, and the bathroom mirror will rarely steam up.
The humidity control system follows the average air humidity level measured over the previous 24
hours. In this way the system automatically adapts to summer and winter conditions.
Air humidity
↳
Vent.low humidity
Settings:
Standard setting:
Description:
Level 1 / Level 2 / Level 3 / Level 4 / Off
Level 1
At low humidity, the unit changes to the set fan speed
level.
↳
Low humidity level
Settings:
Standard setting:
Description:
15
↔
45 %
30 %
The control system calculates an average air humidity
level measured over the previous 24 hours. If the
average air humidity in the extract air falls below this
level, the "Low humidity" function will be activated.
Note! The function is only active in winter mode.
↳
Vent.high humidity
Settings:
Standard setting:
Description:
Level 2 / Level 3 / Level 4 / Off
Level 3
At high humidity levels, for instance when having a
bath, the unit changes to the set fan speed level.
↳
Max time high humidity
Settings:
Standard setting:
Description:
1
↔
180 minutes / Off
60 minutes
The function “High humidity” stops when actual
humidity falls below 3% above the average air
humidity.
The run of this function has been time limited.
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