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5 Product information
• A room from which the air is to be extracted
must be fitted with a non-closable, free supply
air cross section of at least 150 cm², e.g. with
MLK door ventilation grille.
5 Product information
The unit is a small room fan for dehumidifying
rooms, especially cellars and other similar rooms.
The unit has a fixed internal grille and is equipped
with an integrated internal combination sensor for
humidity/temperature. A controlled dehumidifica-
tion takes place based on the comparison
between the indoor climate and the outdoor cli-
mate. The external shutter with integrated ex-
ternal combination sensor for humidity/temperat-
ure must be connected for this purpose. To aid in
the room dehumidification, 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.
For this purpose, the absolute humidity (aH) is
determined as a measure of the water vapour
content in the air using both combination sensors
(those for indoor and outdoor 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 12 minutes. Then the fan is switched off
for a further 12 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.
18
) the unit's fan is auto-
inner
DIP
switch
Button
LED 1
LED 2
DIP switch
Button
Display
LED 1: On
LED 1: Blinking*
LED 1: Blinks twice with
long pause
LED 2: On (in automatic
operation)
LED 2: Off
LED 1 + LED 2: Flash-
ing
* 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 [} 24].
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.
Switching off garage dehumidification/frost
protection:
Operating mode
Fan status
Frost protection func-
tion
Manual ventilation
Function
Automatic operating
mode
Manual ventilation
Frost protection
Active time during de-
humidification (Fan on)
Passive time during de-
humidification (Fan off)
Malfunction
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