10 11
Before using the fan, carefully read these instructions and the warranty conditions.
PRO MULTI is designed for fixed installation and must be installed by a qualified electrician.
All the illustrations referred to in the text can be found on page “III”. Fold the page out to the left so
that you can see the illustrations while reading the user guide.
The PRO MULTI exhaust fan is designed to boost the air flow in houses* with natural draught ventilation.
It is suitable for installation in wet rooms and can be installed in ducts with and without natural ventilation**.
The fan fits ducts with a diameter of Ø or
100 – Ø 140 mm. For larger duct dimensions a cover plate for
the PRO-series must be used. To ensure that the PRO MULTI does not affect other ventilation systems and
is not affected by them, the fan must always be installed in its own duct. Make sure that the duct is clear
of obstructions. Avoid insect mesh, filters and other objects that may obstruct the flow of air. To prevent
condensation in natural draught ducts (in winter), the ducts must be insulated where they pass through
unheated areas such a cold attics.
To avoid backdraughts when the fan is installed in ducts that have no natural draught** (eg through an
external wall), the PRO MULTI is set at the factory to operate continuously at a low speed, so creating a
constant basic flow of ventilation. If the fan is only required to operate with an on/off function, the basic
ventilation flow can be disabled when the fan is installed. For that situation, the fan can be fitted with the
PAX passad backdraught shutter (accessory), provided that another ventilation system ensures the basic
ventilation of the building. (Note that the backdraught fan accessory can not be combined with the fan
function “basic ventilation setting”). NOTE: A backdraught shutter is harmful if the fan is installed in a
ventilation duct with natural ventilation.
The fan is designed for use in a temperature range of 5 to 35 °C. If the fan is installed in a cold area or if it
has been stored in a cold place before installation, it may run slowly when started for the first time.
The fan will work normally when it reaches its working temperature.
Make sure that air can enter the bathroom, for example through a large gap at the door or by using a
transfer air unit. We recommend the use of genuine accessories (see page II) to ensure that the fan works
properly and delivers the correct capacity.
* Primarily detached houses and holiday homes, but can also be used in multi-dwelling
buildings with separate, short ventilation ducts.
** With natural draught ventilation, air is carried upwards through ventilation ducts and out of the
building (see page 15). For natural draught ventilation to work, the air inside the building must be
warmer (and therefore lighter) than the air outside. Natural draught ventilation therefore works
best during the winter. Natural draught ventilation will be reduced or absent if the temperature
differential (inside/outside) is small or non-existent. For this reason, buildings are often poorly
ventilated when the weather is warm.
DeScription oF autoMatic FunctionS/operatinG MoDeS
PRO MULTI includes an unique functionality that automatically activates optimized operation mode.
The fan has no controls, so there is no need for you to make any adjustments yourself.
The fan has three fixed speed settings, each of which is matched to different operating modes:
Setting 1: Low speed (basic flow/basic ventilation)
Setting 2: medium speed (activated by a presence sensor)
Setting 3: High speed (activated by a humidity sensor or started manually with a switch).
Basic ventilation mode
– PRO MULTI
is set at the factory to run constantly at a basic speed (setting 1),
so that it produces beneficial continuous basic ventilation which has a positive effect on the indoor
climate in the entire house. Important: Let your electrical installer know before the fan is installed if you
want this function deactivated
.
Presence and light sensor – with automatic timer function
Automatic impulse o forced flow or start, when someone moves in the vicinity area (see sketch on page
15) or if the light level changes rapidly. The fan runs in setting 2 for 15 minutes (timer function). The fan
then switches to setting 1 (basic flow) or stops. If the IR sensor registers a new “presence”, the fan forces/
starts again after 10 seconds.
Automatic humidity control – A built-in humidity sensor continuously measures the humidity level in
the room and automatically signals the fan to start/force if the humidity in the room increases rapidly
(for example if someone uses the shower). The fan then runs at setting 3 until the humidity in the room
is restored to the normal level. The fan then switches to setting 2 (presence) or setting 1 (basic flow), or it
stops. When the humidity in the room is above 70% RH***, the fan always runs in setting 3.
***At certain times of the year, this may mean that the fan runs constantly for a long time. This is good for the
building and for the people in it. (A humidity level above 70% RH is uncomfortable and encourages mould).
Airing function – If the fan has not run for at least 24 hours it starts automatically (in setting 3) and runs
for 30 minutes at six-hour intervals (in other words 4 x 30 min = two hours per day). The airing function
remains active until the fan receives a signal from the humidity sensor or the presence sensor. NOTE: For
the airing function to be activated, the basic ventilation mode must be disabled when the fan is installed.
Manual starting with a switch with 15-minute timer function
The fan can be connected to be manually forced/started with a separate switch or with the light switch of
the room. When the switch is turned on, the fan is forced/starts (setting 3). When the switch is turned off,
the fan continues to run for 15 minutes (the timer function). At the end of the run-on time the fan switches
to setting 2 (presence) or setting 1 (basic flow), or it stops.
Multi-pole switch (see Figure A3) – More information on page 13.
cLeaninG
For the fan to keep working and maintain its capacity it must be cleaned at least twice a year and more
often if necessary.
• Disconnectthefanfromtheelectricpowersupplybeforecleaningit.
• Pushthetwolockingbuttonstowardsthecentre(A1)andliftthemotorunitoutof
the frame (see Figure A). Then remove the motor unit (A2).
• Cleantheopening,theductandthemotorunitwithadampcloth(amilddetergent
may be used if necessary).
• Theimpellercanbecleanedinplace.Iftheimpellerisverydirtyyoucanremoveitbypulling
it straight out (see Figure B). It can then be washed and rinsed.
(To avoid rust, allow the impeller to dry before refitting it to the motor shaft.)
• Donotusesolventsonthefan.
• Donotimmersethefaninwaterorflushwaterjetsonit.
environMent
A fan that is no longer serviceable should be recycled as electronic scrap.
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