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outdoor climate. To do this, an external shutter
with an integrated external climate sensor MUST
be connected. To aid in the room dehumidifica-
tion, an aeration fan can be directly controlled by
the unit at the same time.
Function of the dehumidification control
The controlled ventilation dehumidifies the rooms
(cellars) through targeted removal of humid room
air and simultaneous supplying of dry outside air.
To do so, the absolute humidity (aH), as a meas-
ure for the water vapour content in the air, is de-
termined by both climate sensors (those for in-
terior and exterior spaces).
This measurement takes place immediately after
switching on the unit. As soon as the absolute
outside humidity falls below the absolute inside
humidity (aH
< aH
outer
matically activated and a dehumidification period
begins (active time).
Ventilation and air extraction take place for
roughly 10 minutes. Then the fan is switched off
for a further 10 minutes so that the moist room air
can mix with the dry air brought in from outside
(passive time). After the waiting period has
lapsed, the comparison of the inside and outside
humidity is repeated.
If the absolute humidity of the outside air is found
to be greater than that of the air inside the room
(aH
> aH
), air is not exchanged. This pre-
outer
inner
vents moist air from flowing in. The fan is only
switched on again once the climate conditions
make dehumidification possible.
Button 1
Button 2
LED 1
LED 2
) the unit's fan is auto-
inner
Reference value de-
termination
Manual ventilation
Operating mode
Fan status
Display
LED 1: On
LED 1: Blinking*
LED 1: Blinks twice with
long pause
LED 1: Blinks three
times with long pause
LED 2: On (in automatic
operation)
LED 2: Off
LED 2: Blinking*
* Simultaneous blinking:
Simultaneous blinking of LED 1 or LED 2 indic-
ates an operating mode or function. If both LEDs
blink simultaneously, there is a fault, see Fault
rectification [} 22].
Successful dehumidification – Button 1 /
Blinking LED 2:
In the case that the room humidity is reduced by
at least 0.2 g/m³, in comparison to the reference
value, the unit signals successful dehumidification
by LED 2 blinking. A reference value of 9 g/m³ is
set on-site. A new reference value can be set at
any time by pushing button 1 during ongoing op-
eration. Saving of the new reference value is con-
firmed by LED 2 blinking briefly.
Frost protection:
To prevent the room from cooling down, the
unit has a frost protection function. This
means that the fan automatically switches off
at inside room temperatures of less than 5°C.
Protection against insufficient humidity:
In the interest of health protection and energy effi-
ciency, the unit offers a function which protects
against insufficient humidity. This protective func-
tion ensures the switching off of the fan if a relat-
ive humidity of less than 30% is reached.
Manual ventilation – Button 2:
The unit switches the fan on and off automatically
and in a manner optimised to demand. When off,
the fan can be switched on manually with button 2
and manual ventilation therefore takes place.
5 Product information
Function
Automatic operating
mode
Manual ventilation
Frost protection
Protection against in-
sufficient humidity
Active time during de-
humidification (Fan on)
Passive time during de-
humidification (Fan off)
Successful dehumidific-
ation achieved (reset-
table with button 1)
17
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