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15 Important Safety Instructions
To reduce the risk of fire, electric shock or
injury, read all the safety instructions and
warning texts before using the unit.
• This unit is only designed for ventilation air in
buildings.
• It must not be used to extract combustible or
flammable gases.
• Remove the power plug before commencing any
service and maintenance work.
• Before you open the door, the unit must be dead
and the fans must have been given time to stop
(min. 3 minutes).
• The unit contains heating elements that must not be
touched when they are hot.
• The unit must not be operated without the filters
being in place.
• Do not cook any combustible substances or flame
anything under the fan (only when a kitchen hood is
connected).
• Do not leave a saucepan or frying pan containing oil
or grease unsupervised (only when a kitchen hood is
connected).
• Follow the instructions in the user manual.
To maintain a good indoor climate, comply
with regulations and, to avoid conden-
sation damage, the unit must never be
stopped apart from during service/mainte-
nance or in connection with an accident.
16 Functional Description
In the (HR-R) rotor, the cold outdoor air and the warm
extract air pass each other without being mixed. With
this principle, a large part of the heat in the extract
air will be transferred to the supply air (see drawings
in Chap. 8). If the outdoor temperature is extremely
low, a thermostat-controlled (EB1) heating element
will also ensure that the supply air has the desired
temperature. This supply air is passed via ducts and
valves to living rooms and bedrooms. The extract air is
extracted either from the same room or via door gaps/
overflow gratings to toilets and wet rooms. The used
air is passed via a duct system back to the unit, emits
heat and is blown out of the building via a roof hat or
wall grating.
The temperature of the supply air is controlled by the
rotor. Only when the rotor is not able to maintain the
set temperature, will the heating element start up.
When there is no need for heating (for example in the
summer), the rotor will stop.
16.1 Heating Elements
The heating elements are protected against
overheating by the (F20) overheating thermostat,
which switches off at 60 °C. As an additional safety
measure, the (F10) overheating thermostat switches
off at 85 °C. The F10 overheating thermostat can be
reset manually by pressing the reset button.
You will find the thermostat by opening the unit doors
(located right above the heating element).
16.2 Operation via Kitchen Hood (SL4 R)
A - Knob for damper/timer
B - Pushbutton for light
Open the damper when preparing food. The damper
closes automatically after a maximum of 60 minutes
or if you turn the damper knob to
as shown in Fig.
29. When the timer is activated, the air handling unit is
forced in addition to the damper function.
This is purely a ventilation system and
not a heating system. The home must
be heated in the normal manner. The
heat gained from heat recovery must
be seen in relation to a situation in
which the extract air is blown right out
of the home without recovery.
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