6 Technical data
19
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.
Manual operation is ended by again pressing but-
ton 2 or automatically after approximately 20
minutes.
Optionally, manual operation can take place with
an external button, see Wiring diagrams. The fan
cannot be switched off manually using the button
when in the automatic operating mode.
Manual ventilation – external button/switch:
Optionally to button 2, manual operation can take
place with an external button or switch, see Wir-
ing diagrams.
To achieve this, an automatic button/switch re-
cognition via the duration of the first activation
after power is supplied. A switch is recognised
when the switching contact is closed for more
than 10 seconds.
Manual ventilation with an external button is equi-
valent to using button 2.
If an external switch is connected, manual ventila-
tion is switched on or off in accordance with the
switch setting. An automatic switch-off of the
manual operating mode does not exist in this
case.
Manual ventilation is also possible during
frost protection and protection against insuffi-
cient humidity.
NOTICE Damage to the building fabric due to
manual ventilation
Excess manual ventilation can lead to room hu-
midification if the outdoor conditions are humid.
Therefore, you must pay attention to the duration
of the manual ventilation when using an external
switch.
6 Technical data
6.1 Ambient conditions
• Permissible maximum temperature of air me-
dium + 40 °C.
• Sufficient supply air intake must be ensured
during operation with air-ventilated fireplaces.
The maximum permitted pressure difference
per residential unit is 4 Pa.
6.2 Technical data table
.
7 Mounting preparations
Suitable mounting material is to be
provided by the customer.
7.1 Wall
Use mounting material suitable for base and of
sufficient dimensions. Ensure sufficient supply air.
The prescribed minimum distances to the
wall and the ceiling shown in the figure must
be observed.
1. Make sure the housing has a level base.
2. Fit wall breakthrough or drill core hole: Min-
imum diameter, 150 mm.
ð
Recommendation: Fit WH 150 wall sleeve.
Fit a wall breakthrough with a minimum dia-
meter of 170 mm.
3. Lay power cable (flush-mounted) up to install-
ation location, see above for spacing.
Feed
the power cable at least 110 mm out from
the wall
.
7.2 Ceiling
1. Perform installation preparations as described
in Chapter
