5 Product information
18
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
outer
< aH
inner
) the unit’s fan is auto-
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
outer
> aH
inner
), air is not exchanged. This pre-
vents moist air from flowing in. The fan is only
switched on again once the climate conditions
make dehumidification possible.
Button 1
Reference value de-
termination
Button 2
Manual ventilation
LED 1
Operating mode
LED 2
Fan status
Display
Function
LED 1: On
Automatic operating
mode
LED 1: Blinking*
Manual ventilation
LED 1: Blinks twice with
long pause
Frost protection
LED 1: Blinks three
times with long pause
Protection against in-
sufficient humidity
LED 2: On (in automatic
operation)
Active time during de-
humidification (Fan on)
LED 2: Off
Passive time during de-
humidification (Fan off)
LED 2: Blinking*
Successful dehumidific-
ation achieved (reset-
table with button 1)
* 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
.
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:
