Swegon CASA W4 Smart Guide

W4_f_EN-t
Installation, commissioning and maintenance instruction
Swegon Home Solutions
CASA®W4 Smart

W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
Installation, operation and maintenance instructions
for design engineers, installation engineers and service personnel
Contents
2
Important information ............................................. 3
1. General Description .............................................. 5
1.1 Enclosure .........................................................................5
1.2 Fans.................................................................................5
1.3 Filter ................................................................................5
1.4 Heat exchanger................................................................5
1.5 Temperature ....................................................................5
1.6 Protective functions .........................................................6
2. Installation............................................................. 7
2.1 Ventilation unit installation site ........................................7
2.1.1 Wall mounting..............................................................7
2.1.2 Ceiling mounting..........................................................7
2.2 Condensate discharge......................................................8
2.3 Ducts...............................................................................9
2.4 Sealing around duct penetration collars ...........................9
2.5 Electric and control cables..............................................10
2.6 Bypass for kitchen..........................................................10
2.7 Installation of the Smart control panel............................11
2.8 Connecting water pipes in the Econo model ..................11
3. Commissioning.................................................... 12
3.1 Air flows........................................................................12
3.1.1 Setting the basic air flows ...........................................12
3.1.2 Travelling ....................................................................12
3.1.3 Maximum automatic boost .........................................12
3.2 Commissioning external equipment ...............................12
3.2.1 Digital switch input (DI)...............................................13
3.2.2 Control inputs (AI) ......................................................13
3.2.3 Relay outputs (DO)......................................................13
3.2.4 Control outputs (SEC/SEM – AO4)...............................13
3.3 Smart functions .............................................................14
3.3.1 Shortcuts ....................................................................14
3.3.2 Summer mode............................................................14
3.3.3 Cooker hood function.................................................14
3.3.4 Central vacuum function.............................................15
3.3.5 Fireplace function .......................................................15
3.3.6 Automatic Home/Away/Boost system..........................15
3.3.7 Automatic humidity system.........................................15
3.3.8 Automatic air quality control.......................................16
3.3.9 Temperature boost......................................................16
3.4 Heating/cooling .............................................................17
3.5 Anti-frost protection ......................................................17
3.6 Restoring factory settings...............................................17
3.7 Changing the service code.............................................17
3.8 Use................................................................................17
4. Service.................................................................. 18
4.1 Service reminder ............................................................18
4.2 Opening the ventilation unit ..........................................18
4.3 Filter ..............................................................................18
4.4 Heat exchanger..............................................................18
4.5 Fans...............................................................................18
4.6 Other servicing...............................................................18
5. Alarms and Troubleshooting.............................. 20
5.1 Alarm, cooker hood.......................................................20
5.2 Alarm, control panel ......................................................20
5.3 Troubleshooting.............................................................20
6. List of components ............................................. 22
7. Technical data...................................................... 23
7.1 Fan outputs (EN 13141-4)..............................................23
7.1.1 W4 .............................................................................23
7.1.2 W4 Econo...................................................................23
7.2 Outputs of the components...........................................24
7.3 Acoustic data.................................................................24
7.4 Econo, pressure loss in water-heated air heaters.............26
7.5 Econo, sizing of the water-heated air heater ..................26
7.6 Electrical wiring diagram................................................27
7.6.1 W4 .............................................................................27
7.6.2 Control functions with accessories ..............................28
7.7 Control diagram ............................................................30
7.7.1 W4 .............................................................................30
7.7.2 W4 Econo...................................................................31
7.8 Dimensions....................................................................32
7.9 Weights .........................................................................32
7.10 Ventilation unit codes ..................................................33
7.11 Accessories for installation ...........................................33
8. Commissioning form........................................... 34
Warranty Conditions .............................................. 35
EC Declaration of Conformity ................................ 36

W4.080219
We reserve the right to alter specifications. 3www.swegonhomesolutions.com
Important information
Qualified personnel only
Only qualified personnel should carry out installation,
configuration and commissioning.
Standards and requirements
The pertinent national standards and regulations
dealing with installation, configuration and com-
missioning must be followed if the equipment is to
operate correctly.
At the address, www.swegonhomesolutions.com
(Toolbox > Find PDF), you will find the document
“Project planning instructions for ventilation”, in
which power supply, sound, air flows and duct sys-
tem requirements are presented.
Measurement and electrical work
If you carry out voltage tests, measure the electri-
cal insulation resistance at various points or perform
other remedial measures that could damage sensitive
electronic equipment, you must first isolate the venti-
lation unit from the electrical supply grid.
Surge protection
Swegon recommends that all ventilation units
equipped with Smart automatic control be equipped
with a surge protection device.
Earth fault circuit breaker
Swegon recommends that all ventilation units
equipped with Smart automatic control be equipped
with a residual current device. Comply with local
electrical safety regulations when you install electrical
equipment.
To open the ventilation unit for service
Always ensure that the ventilation unit’s power sup-
ply has been isolated before you open the inspection
door! Wait a few minutes before you open the in-
spection door on the ventilation unit so that the fans
have time to stop and air heaters, if fitted, have time
to cool down.
Always turn the ventilation unit’s service switch to
the 0-position before opening the inspection door.
There are no components inside the electrical equip-
ment cabinet that can be serviced by the user. Leave
the servicing or these components to service person-
nel. Do not restart the ventilation unit before you’ve
identified the cause of the fault and service personnel
have serviced the ventilation unit.
Drying laundry
A tumbler dryer of extract air type or a drying cabinet
must not be connected to the system due to the high
moisture content in the air it discharges. However,
we recommend the use of a condensing tumbler
dryer without duct connection.
Models equipped with water-heated air
heater
When there is a water-heated air heater in the ven-
tilation system (Econo model ventilation unit or duct
mounted air heater) the system should be equipped
with shut-off damper so that the air heater cannot
freeze during a power failure.
Commissioning
Do not commission the ventilation unit until all car-
pentry work that produces large quantities of sand-
ing dust or other impurities has been completed.
The duct connection spigots of the ventilation unit
must be covered by lids while the unit is being trans-
ported, kept in storage and mounted at its final
location.
Make sure that the ventilation unit, filters and ducts
are clean and that there are no loose objects in them
before you commission the ventilation system.
Condensation
The surface temperature of the ventilation unit can
drop down to 12 °C during periods of low outdoor
temperature and depending on the moisture content
of the air surrounding the unit, moisture may con-
dense on the surface. Consequently, condensation
should be taken into account when choosing fur-
nishings that are to be installed in the vicinity of the
ventilation unit.
NOTE! The manual’s original language is Finnish.
!
This document is intended for everyone involved in the installation work for or the use of a Swegon CASA ven-
tilation unit. Read this Instructions for Use before you use the ventilation unit. Save the Instructions for Use for
future use. If you mislay the Instruction for Use, you can download a new copy from our website.
The ventilation unit is not designed to be used by children (below 8 years old) or by persons whose senses, physi-
cal or mental capacity or a lack of knowledge and experience limits safe use of the ventilation unit. Such persons
may use the ventilation unit if supervised by a person who is responsible for their safety, or according to the
instructions.

4
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
Included in the delivery:
• Ventilation unit, W4
• Anti-vibration mountings (2 pcs.)
• Instructions for Use (FI, SE, EN + NO, DE)
• Installation, commissioning and maintenance instruc-
tion (FI + SE)
• “Remember to change the filter” decal
• Product information sheet
• Smart control panel*
• Modular cable, 20 m*
• Wall mounting bracket*
• Condensate discharge tube*
*) Included in the delivery
*) W4 models W04VR05S11HA
W04VL05S11HA
W04VREES11HA
W04VLEES11HA
Standard connections:
• Power supply cable with mains plug
• Modular cable with RJ9 connector (1.5 m)
• Free configurable I/O contacts for connection of acces-
sories (2 pcs.)

W4.080219
We reserve the right to alter specifications. 5www.swegonhomesolutions.com
1. General Description
The most important function of the ventilation system
is to ensure clean and fresh indoor air and to remove
moisture. The air in the home should be changed at
a continuous and sufficient rate to ensure a pleasant
indoor climate and avoid damage to building elements
caused by dampness. The ventilation unit should be
stopped only while service work is in progress.
1.1 Enclosure
The ventilation unit conforms to enclosure class IP34
when the cover is closed.
1.2 Fans
The Swegon CASA W4 is equipped with energy-efficient
fans with EC motors, advantageous in that their speed
is variably controllable and their efficiency is high even
when they operate in the lower speed range. The power
supply and control cables of the fans have quick-fit con-
nectors making the fans easily removable from the unit,
if required.
The fans can be controlled in four operating modes
from a Smart control panel or in three operating modes
from a compatible Swegon CASA cooker hood:
• Boost = large air flow is used when the ventilation
requirement increases, e.g. for cooking, taking a
sauna, showering or drying laundry.
• Home = normal air flow. Guarantees that there is
sufficient fresh indoor air in the home, and that the
building construction is at its best.
• Away = low air flow. Reduces power consumption
when the ventilation requirement in the home is
small.
• Travelling = very low air flow and lower supply air
temperature. Used when no one is present in the home.
(Can only be selected from a Smart control panel.)
The unit’s weekly timer has four programs that can
switch in the various fan modes at the preset times. On
the unit with electric post heating, you can also select
the required temperature of the supply air. Even when
the ventilation unit is being controlled with the weekly
timer, it is always possible to change the fan mode from
a control panel or a cooker hood.
You can select an air flow boost time of 30, 60 or
120 minutes or continuous boost from a Smart control
panel. When the unit is controlled from a cooker hood,
the fan’s air flow boost time is 60 minutes. You can
select a damper open time of 30, 60 or 120 minutes.
1.3 Filter
The ventilation unit houses a G3 filter for the extract
air and a F7 fine filter and a heat resistant filter for the
supply air.
1.4 Heat exchanger
The plate heat exchanger in W4, which is based on
the counterflow technology, is made of aluminium
fins and its efficiency is high, above 80 %. The incom-
ing and outgoing air flows in a counterflow plate heat
exchanger use separate channels, and thanks to this the
heat exchanger does not return any odours or moisture
back into the room air. The heat exchanger can be easily
removed from the unit for inspection and servicing.
1.5 Temperature
The user sets the required value for minimum supply
air temperature, and the ventilation unit then strives to
reach this temperature if possible. Swegon recommends
that the supply air temperature is set between 15–20 °C
and the factory setting is 17 °C, which is sufficient for
draught-free ventilation. The supply air temperature
should be 3–4 °C lower than the room temperature, so
that the supply air mixes fully with the room air.
Remember the following when setting the supply air
temperature:
• A high temperature setting will also increase the
ventilation unit’s power consumption.
• A low temperature setting, for example, 14 °C, can
cause condensation to collect in the system.
• The ventilation unit cannot cool the supply air with-
out an air cooler (duct coil), which is available as an
accessory.
In the Econo models, the setpoint can be set with
a thermostat inside the ventilation unit. You can
turn the thermostat dial to the minimum setting if
heating is not required.
W4's intelligent summer mode helps to maintain
the home's indoor air comfort even during hot sum-
mer days. Very economical comfort coolness can be
produced almost free of charge by utilising the heat
exchanger and the difference between indoor and
outdoor temperatures intelligently. The heat exchanger
takes care of the cool indoor air during hot summer
days and cools the incoming outdoor air. At night the
air passes the heat exchanger and the home is cooled
with outdoor air. This is managed by an advanced auto-
matic system.

6
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
1.6 Protective functions
The heat exchanger’s freeze protection
W4's defrosting function guarantees continuous and bal-
anced ventilation in the home even during extreme condi-
tions. If there is a risk of the heat exchanger in the ventila-
tion unit freezing, the preheater is activated and the speed
of the fans is changed and in doing so the heated extract
air prevents freezing inside the heat exchanger.
The fans’ overheating protection
The fans have thermal overload cut-outs, which stop
them if the temperature rises too high. The controller
also stops the fans if a serious malfunction occurs in the
ventilation unit. The protective function resets itself au-
tomatically when the temperature drops or the malfunc-
tion has been remedied.
Electric air heater
The electric air heater is equipped with overtemperature
protection. If the overtemperature protection trips, you
must not continue to use the ventilation unit until the
cause of the overtemperature protection tripping has
been established and the fault has been rectified.
An automatic overtemperature protection switches off
the air heater if a fault situation arises. This protective
device automatically resets itself when the air heater has
cooled down.
The thermal overload cut out with manual reset can be
reset by pressing a button inside the ventilation unit. The
acknowledgement buttons are located next to the air
heaters. The buttons are marked in the illustrations below.
When you press the reset buttons and feel a click, the
overtemperature protection (thermal overload cut out) has
then been reset.
Ventilation unit with water-heated air heater
The ventilation unit with water-heated air heater has a
temperature sensor that protects the air heater from freez-
ing. The air heater freezing warning alarm appears on the
screen if the temperature of the water heated air heater
drops too low, but the unit continues to operate normally.
If the air heater’s temperature drops further, the controller
will stop the ventilation unit to prevent the air heater from
freezing. An alarm is then shown on the cooker hood.
When the temperature of the air heater has risen suf-
ficiently, the ventilation unit and panel show a so-called
remaining info-alarm, . The Info alarm can be reset
from “Alarm” on the main menu.
Cold supply air
The ventilation unit has built-in condensation protection
on the ventilation duct. If it is discovered that the supply
air is too cold, the ventilation unit stops and an alarm is
shown the cooker hood.
Temperature sensors
If a sensor fault is detected, the ventilation unit enters
restricted mode to prevent damage to the ventilation
unit. The functions related to the current sensor in ques-
tion are deactivated and the ventilation unit works as
well as possible. The ventilation unit's function returns
to normal once the fault has been corrected.
Reset button for the over-
temperature protection on
the preheating air heater
Reset button for the over-
heating protection on the
post heating air heater
(Only models with electric
air heater)

W4.080219
We reserve the right to alter specifications. 7www.swegonhomesolutions.com
2. Installation
2.1 Ventilation unit installation site
The temperature in the space where the unit will be
installed must be more than +10 °C. The ventilation unit
can be installed in a machine room, store room, etc. The
ventilation unit can be installed in a machine room, stor-
age space, etc.
The ventilation unit should not be secured to a wall that bor-
ders to a living room or a bedroom due to the risk of noise.
During installation, arrange electric and control cables to
make them easily accessible.
The ventilation unit can be mounted either on the wall
in a wall mounting bracket or on the ceiling with a
mounting frame. The mounting frame required can be
purchased separately as an accessory.
The unit should be mounted as near as possible to a wall
or ceiling. The space between the ventilation unit and the
wall should be insulated so that the sound from the unit
will not be transmitted out through the rear wall.
Connect the extract air from a CASA cooker hood, if
installed, via a duct to the extra duct connection spigot
on the top side of the ventilation unit, which on delivery
is plugged.
2.1.1 Wall mounting
Mount the ventilation unit on a wall by means of a wall
mounting bracket which is available as an accessory.
If the wall is composed of vertical studs and wall boards,
the wall must be reinforced with horizontal studs that
will support the weight of the unit. Swegon also recom-
mends that the wall be insulated with mineral wool or
similar insulation for preventing sound from propagat-
ing to other rooms.
Screw the wall mounting firmly in horizontal position
onto the wall where a wall stud will support the weight
of the unit.
Screw the adjustment feet in position on the lower edge
of the rear wall of the ventilation unit before lifting the
unit onto the wall bracket.
414
346
80
299299
505
68
54
14
439
Lift up the ventilation unit onto the wall mounting
bracket so that the ears on the bracket engage in the
corresponding notches at the top on the backside of
the unit. The ventilation unit’s heat exchanger can
be removed to make it easier to lift the unit. See the
”Servicing” Section.
Set the final position of the ventilation unit with the
help of the adjustable feet so that the ventilation unit
tilts backwards slightly.
2.1.2 Ceiling mounting
The ventilation unit can also be mounted in a ceiling
mounting frame (available as an accessory) on the ceiling.
Fasten the ceiling mounting frame in ceiling anchor
sleeves with four M8 threaded rods. The length of rods
must be adjusted so that they will be positioned approx.
15 mm under the inner surface of the ceiling mounting
frame. Install at least three threaded rods in the corners
of the ceiling mounting frame. To avoid a possible col-
lision with the ducts, one of the threaded rods can be
located in the hole next to the corner.
Screw in the M8 nuts onto the threaded rods to such a
height that the ceiling mounting frame will be
1
2
1.Horizontal stud for the ventilation
unit’s mounting bracket
2.Acoustic insulation
1
2
3
1.Insulated wall
2.Horizontal stud
3.Wall mounting
bracket
Wall mounting bracket’s dimensions
299299
505
68
54
14
505

8
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
horizontal when the top of the frame goes against
the nuts. Fit the ceiling mounting frame through the
selected holes towards the nuts of the threaded rods
and lock the frame into position with nuts from under-
neath. Adapt the installation height so that the locking
screws in the mounting frame’s front section will extend
sufficiently far below the ceiling.
Important
If you improperly tighten the ceiling mounting
frame, this could turn the frame and the venti-
lation unit will not have room inside the frame.
!!
Run the mounting hooks through the assembly open-
ings above the ventilation unit and secure them with
tension rivets. Position the hooks so that the sharp point
is facing the rear side of the ventilation unit.
The hooks must absolutely not be secured with riv-
ets directly above the ventilation unit.
Run the power supply and data cables, and on the
Econo model the water pipes, through the ceiling
mounting frame.
Screw the adjustment feet in position on the lower edge
of the rear wall of the ventilation unit before lifting the
unit onto the frame. The ventilation unit’s heat exchang-
er can be removed to make it easier to lift the unit. See
the ”Servicing” Section.
Lift the ventilation unit so that the hooks go through
the fastening holes in the mounting frame. The ventila-
tion unit is locked in place when the ends of the locking
rails are touching the front plate of the mounting frame
and can be seen from the openings on the front edge of
the frame. (see picture)
Finally adjust the position of the ventilation unit using the
adjustment feet, so that the unit tilts backwards by a few
degrees. However, make sure that the ceiling mounting
frame isn’t rotated too much.
The pipe connections of the Econo model should be ar-
ranged inside the ventilation unit. The connection work
will be facilitated if you temporarily remove the heat
exchanger and filter from the unit. Connect the inlet flow
pipes to the thermostat (3/8” female threads) and the re-
turn pipe in the coupling with ∅15 mm on the ball valve.
2.2 Condensate discharge
Connect the discharge hose to the ventilation unit’s
condensate discharge connection (3/8" male threads).
The condensate is led off to a floor drain or the like us-
ing a hose (accessory, CDH3), or a hose or pipe with an
inner diameter of at least 12 mm. The hose must not be
led off directly to the drain. The tube must not have a
second water trap or be run horizontally. The damming
height of the water trap should be at least 100 mm.
A hose to lead off the condensate is available as an ac-
cessory (CDH3). The hose has a ready-made loop that
serves as a water trap.
200 mm

3/8" male thread
Detailed installation
instructions:
www.swegon.com

x

W4.080219
We reserve the right to alter specifications. 9www.swegonhomesolutions.com
There is a metal water trap available as an accessory
(UVL).
Check that the condensate discharge outlet is not
clogged and check its outflow by pouring water on
the bottom of the ventilation unit. The condensate
discharge connection is located on the rear of the unit
under the rotary heat exchanger.
Important
Check whether the ventilation unit has
been supplied in the right-hand or left-
hand version to make certain that you are
connecting the ventilation ducts to the
correct duct connection spigots on the unit.
Check the ventilation plans to make sure
that the duct connections are correctly in-
stalled. See also the dimensional drawings
in the Section entitled: “Technical data”.
!!
2.3 Ducts
Install the ventilation ducts, sound attenuators, sup-
ply air diffusers, air intake grilles and exhaust air ducts
as shown in the ventilation drawings. To prevent the
propagation of sound, do not install the ducts directly
against structural building elements.
Insulate the ventilation ducts in order to reduce loss
of heat or cooling energy and to prevent water from
condensing on surfaces. In addition, it is advisable to
insulate the ducts to prevent the spread of fire. It is of
greatest importance to insulate cold ducts without
gaps in the insulation, so that moisture cannot
condense.
2.4 Sealing around duct penetration
collars
It is advisable to use a mounting frame for sealing the
vapour barrier in the attic tie beams.
It is important to the preserve the tightness of the
vapour barrier at the duct penetration collars. A building
element penetration seal (accessory) will facilitate this.
This item is available in sets of 3 pieces, for diameters:
100, 125 and 160 mm, and are attached to the vapour
barrier with tape.
Cut up the openings with approx. 10 mm smaller diam-
eter than that of the ducts. Secure the mounting frame
in the ceiling with screws through the holes on the
sides. The plastic film of the vapour barrier should either
be stretched and fastened between the mounting frame
and the structural element of the building, or be taped
tightly against the mounting frame.
The thickness of the insulation and the nature of the
surface layer of the ventilation ducts vary depending on
insulation material, climate zone and national standards
in force. For this reason, Swegon does not offer any
recommendations. Most manufacturers of insulation
material offer calculation programs for the calculation of
sufficient and correct insulation.
In renovation projects, it is advisable to examine the
existing ducts to determine whether they are sufficiently
and correctly insulated. Insulating in the right way is
necessary for the ventilation unit to operate correctly. If
the ducts are uninsulated, even across a small area,
there is a high degree of risk of condensation and
indirect damage.
The supply air duct should be fitted with acoustic insula-
tion along the stretch between the unit duct outlet and
the sound attenuator, so that fan sound will not be
propagated out into the room.
In general, ventilation ducts should be insulated in the
following manner:
• Insulate outdoor air ducts run through warm spaces.
• Exhaust air ducts should always be insulated in ac-
cordance with national regulations. See separate pro-
ject planning instructions (for example Fire resistance
classification requirements).
• Insulate supply air ducts in cold spaces.
• Insulate extract air ducts in cold spaces.
• If the air inside the duct is colder than in the sur-
roundings; the insulation should be protected by a
vapour barrier.
Important
Even small gaps in the insulation impair
the sound attenuation and bring about
a risk of condensation and consequential
damages.
!!
Important
Before commissioning the ventilation system,
check that the ventilation unit, filters, con-
densation drain and ducts are clean and that
there are no loose objects inside them.
The ventilation ducts should be cleaned
regularly and always when the home is
renovated.
!!
Important
It is absolutely forbidden to operate the
ventilation system during the construction
period or if dust-raising work is carried out.
Before installing the unit, the ducts should
be blanked off with covers to prevent the
entry of impurities.
!!

10
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
Important
If any further electrical wiring is required,
only a qualified electrician shall be allowed
to carry out this work. The electric and
control cables are located on the upper side
of the ventilation unit. Make sure that the
electric cable can be connected to a wall
outlet without obstruction.
!!
2.6 Bypass for kitchen
The cooker hood is usually connected to the ordinary
extract air duct. However the cooker hood can be
connected to the ventilation unit’s separate extract air
connection, in order to meet national regulations or for
achieving a more effective than normal extract air flow.
The extract air from a compatible Swegon CASA cooker
hood can be conveyed via a duct to an extra duct connec-
tion on the top of the ventilation unit. The duct between
the cooker hood and the ventilation unit must be installed
in such a way that makes it possible to clean it.
The ventilation unit can be controlled from the cooker
hood control panel.
Important
The bypass for a kitchen is intended for use
when the air flows from the cooker hood/
kitchen are boosted. The kitchen’s general
ventilation must take place via the extract
air duct. If the general ventilation takes
place continuously via the cooker hood, the
supply air and extract air flows through the
heat exchanger will be out of balance, and
this will lower the efficiency and impair
the ventilation unit’s anti-freeze protection
functions during the winter.
!!
2.5 Electric and control cables
A 1.5 m long cable with earthed plug-in contact is fitted
to the ventilation unit for measuring the voltage. The
cable extends from the top of the unit. The mains plug
serves as the ventilation unit’s main switch and it should
be connected to an electric socket at an easily acces-
sible spot. For power required, see the Section entitled:
“Technical data”.
There is an earthing point on the top surface of the
ventilation unit body.
On top of the ventilation unit are two modular cables
for control of the unit. The maximum connected length
of the modular cable in the system is 40 metres. If the
modular cable is lengthened within some building ele-
ment (such as in a wall), the cable should be lengthened
in a ∅20 mm dia. conduit, anticipating a possible later
change of cabling.
When installing the unit, make sure that you provide
adequate access to the connector of each cable (loose
ones as well), e.g. for servicing and adjusting the unit, if
and when the need arises.
In apartment buildings, a control panel can be used as a
so-called hand-held terminal in conjunction with service
and installation work.
Any accessories are either connected to the ventilation
unit’s four-way connector (2 optional functions) or to
the external connection modules (3 optional functions).
Cables are routed via the lead-through openings in the
top of the ventilation unit. The connection of any acces-
sories is described in the section “External connections”.
Cables to connection modules and accessories are not
included in the supply.

W4.080219
We reserve the right to alter specifications. 11www.swegonhomesolutions.com
The modular cable connected to any outlet socket on
the panel.
Finally, refit the front panel.
2.8 Connecting water pipes in the Econo
model
The pipe connections of the Econo model should be ar-
ranged inside the ventilation unit. The connection work
will be facilitated if you temporarily remove the heat
exchanger and filter from the unit. Connect the inlet
flow pipes to the thermostat (3/8” female threads) and
the return pipe in the coupling with ∅15 mm on the
ball valve.
The Econo model requires a continuous circula-
tion of hot water during the heating season. The
Econo model ventilation unit should be equipped
with shut-off damper so that the water-heated air
heater cannot freeze during a power failure.
2.7 Installation of the Smart control panel
A maximum of two Smart control panels can be con-
nected to the ventilation unit, with different mutual ID
numbers. A 20 metre long modular cable is included to
connect the control panel. Run the cable to the desired
place where the panel will be mounted. A Smart control
panel can be mounted up to 40 metres from the unit
(using 2 x 20 metre long modular cables).
The front panel on the Smart control panel is released
using a screwdriver to push the retaining clips through
the holes on either side.
If several control panels are connected in chain, the
middle panel’s bus termination is moved to the “Open”
position. The jumpers do not need to be adjusted if only
one control panel is used.
Bus termination: openBus termination: terminated

12
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
The ventilation system’s settings in connection with
commissioning and servicing are made from the pass-
word-protected “Settings” menu on a Smart control
panel. To open the menu, enter code 1234. (The code
can be changed). In conjunction with commissioning,
you always need to set at least the air flow and carry
out any adjustments to the Smart sensor if fitted.
Settings
Airflow adjustments
IO controls
Smart functions
Heating / Cooling
Defrost settings
Reset factory settings
Change service code
3.1 Air flows
Sizing curves for air flows are set out in the section
“Technical data”. A qualified person should set the ven-
tilation unit’s and the ventilation equipment’s air flows
with the help of measurement equipment so that they
correspond with the ventilation plan.
All basic air flows must be set so that the ventila-
tion unit operates correctly! Enter the settings in the
commissioning protocol.
In new homes, there is still construction moisture and the
house initially requires higher ventilation in order to remove
the moisture from the building. A great deal of moisture
in the home manifest itself in the form of moisture on cold
surfaces. We recommend that in new houses to use higher
volumes of air at first to remove moisture.
It is recommended in order to improve the efficiency of
the ventilation to use an automatic moisture sensor or
to actively use the ventilation unit’s boost speed, if there
is a sauna, pool or equivalent moisture producer in the
home.
3.1.1 Setting the basic air flows
Before you start to adjust the air flows, ensure that the
filters are clean and that there are no foreign objects or
debris inside the ventilation unit.
3. Commissioning
Choose commissioning mode when the ventilation
unit’s fans run at the speed being set and functions that
can disrupt the setting, such as anti-freeze protection,
are disabled.
Airflow adjustments
Commissioning mode
Home (exhaust)
Away (supply)
Away (exhaust)
Boost (supply)
Boost (exhaust)
Travelling (supply)
Max Smart boost (supply)
50%
35%
38%
90%
92%
35%
82%
Control type Fan control
Home (supply) 48%
Adjust the control functions for the operating modes
Home, Away and Boost so that the air flow rates ac-
cording to the ventilation plan are reached.
Fill in your entered settings in the commissioning report.
3.1.2 Travelling
You can reduce ventilation unit’s power consumption
by using the “Travelling” function, when the home is
empty for long periods, among others by reducing the
ventilation. Set the supply air flow to “Travelling” mode.
The extract air flow is determined automatically based
on the basic air flows.
3.1.3 Maximum automatic boost
Automatic functions boost the ventilation as required all
the way up to the maximum automatic boost. The func-
tions can be limited by reducing the value.
3.2 Commissioning external equipment
External equipment can be connected to the ventilation
unit’s configurable I/O connections (connection instruc-
tions can be found in the section “Technical data”). You
can connect two optional inputs to the ventilation unit’s
circuit board and to the SEC/SEM expansion modules,
which are available as accessories, you can connect
three. The connection of an external duct mounted air
Important
Set the air flows in accordance with national
regulations when you commission the ven-
tilation system. The system should be com-
missioned by a qualified person, and the air
flows must not be changed on one’s own
responsibility, since doing so could disrupt
the way the ventilation system operates.
!!
Important
The functions described in this instruction
apply to the ventilation unit and control
panels with software version 1.12 and later.
In older control panels they only apply to
basic functions.
!!

W4.080219
We reserve the right to alter specifications. 13www.swegonhomesolutions.com
19. RH AI*
20. CO2AI*
21. VOC AI*
*) See the instruction supplied with the optional
equipment.
3.2.3 Relay outputs (DO)
The IO connections can be used for relay control
(24 VDC). See the connection instructions in the section
“Technical data”.
As relay outputs you can select:
22. Alarms
23. Duct damper
24. Away
25. Boost
26. Modbus*
27. DI control The position of the output is controlled by
relay control DI.
Important
The control card can be damaged if you
short-circuit the I/O-connection selected by
the relay output.
!!
3.2.4 Control outputs (SEC/SEM – AO4)
The ventilation unit’s operating mode can be read as a
voltage signal on the AO4 output. If the ventilation unit
is controlled variably with Smart functions, the actual
value is regulated between the voltages 2 – 5 – 8 V.
Actual value for the fan speed 0-10 VDC
0 V = Not DDC control
1 V = Travelling
2 V = Away
5 V = Home
8 V = Boost
10 V = Stopped
heater is performed to the SET expansion module, ac-
cording to the instruction supplied with the accessory.
When you connect external equipment to the venti-
lation unit, the function of I/O connections must be
defined in the menu “Setting/IO-control” (the standard
option is shown in the figure).
IO controls
IO 1
IO 2
IO 3 (ext.)
IO 4 (ext.)
Boost - DI
Away - DI
Emg.Stop_NO - DI
Fireplace - DI
IO 5 (ext.) DDC control - AI
3.2.1 Digital switch input (DI)
Switch input options are:
1. Emg. Stop NC
2. Emg. Stop NO
3. Stop
4. Fireplace
5. Cooker hood
6. Central vacuum
7. Forced boost
8. Away
9. Boost
10. Modbus (not priority)
11. Relay control (not priority)
The priority of the selected inputs is determined accord-
ing to the previous list, so that a function that is higher
on the list has a higher priority than those below.
3.2.2 Control inputs (AI)
12. By selecting DDC - AI, the ventilation unit’s operat-
ing mode can be controlled by a voltage signal.
Operating mode control 0–10 VDC (+/- 0.5 V)
0 V = Not DDC control
1 V = Travelling
2 V = Away
5 V = Home
8 V = Boost
10 V = Stopped
13. Variable control occurs between the voltages 2 V
– 5 V – 8 V. The ventilation then switches variably
between operating modes Away - Home - Boost.
Otherwise, control is performed according to the
normal DDC control.
14. Modbus AI*
15. PA supply air*
16. PA extract air
17. l/s (supply air)*
18. l/s (extract air)*

14
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
Summer mode
Mode
Fresh air limit
Fresh air start limit
5°C
User
14°C
Room temperature start limit Off
Supply air temperature min.
AC boost
Room temperature boost limit
User
14°C
22°C
Hood boost
Use in away mode
Outdoor air limit determines at which outdoor air
temperature the function is permitted. Outdoor air start
limit determines the need of cooling.
If you select “Room air temperature limit”, the need
of cooling is determined by the room air’s temperature
exceeding the Room temperature start limit. The supply
air limit determines the supply air’s minimum tempera-
ture. If you change the value, you must take the risk of
condensation on the pipes into consideration.
By changing the value Boost limit value room temp. dur-
ing AC boost you can determine at which room tem-
perature the ventilation shall start to variably boost.
Selecting Hood boost allows you to operate the damper
on a compatible cooker hood to the open position to
boost cooling.
Selecting In use in Away mode allows you to determine
whether ventilation boosting will be permitted in Away mode.
3.3.3 Cooker hood function
The cooker hood function balances the ventilation when
the cooker fan is used to help prevent excessive negative
pressure and improves fume extraction capability of the
cooker hood. This function enables you to boost the venti-
lation if necessary. The function starts automatically when
the damper in a Swegon CASA cooker hood is opened or
for a cooker hood defined I/O input (IO-control) receives
the signal and runs until the damper is closed.
The function is put into service from the Settings/Smart
functions/Cooker hood boost menu. The settings menu
is opened when the function is put into service.
Cooker hood function
Home state Compensation
Boost state Compensation
20%
Hood boost
0%
Roof fan
85%
In use
Commissioning mode
Select “Commissioning mode” for air flow settings. This
activates the signal to be set and the damper is oper-
ated to the open position.
3.3 Smart functions
The Smart functions can be activated from the control
panel or via external inputs, or they can act as so-called
background functions as required. These functions are
set as needed from the “Smart functions” menu.
Smart functions
Smart functions
Summer mode
Cooker hood function
Central vacuum function
Fireplace function
Auto Home/Away/Boost
Auto RH control
Auto Air Quality control
Temperature boost
3.3.1 Shortcuts
From the “Shortcuts” menu you can set which functions
are to be visible to the user. When boost is selected,
boosting is used on all connected sensors.
Smart functions
Fireplace function
Travelling
Central vacuum function
Boost
Summer mode
Temperature boost
Shut down
3.3.2 Summer mode
Summer mode bypasses the ventilation unit’s heat
exchanger when it needs to cool and the outdoor air is
colder than the room air. You then get cool outdoor air
in the room.
The heat exchanger takes care of the cool indoor air
during hot summer days. The capacity in summer mode
can be selected from a quick menu, and the ventilation
unit will then automatically determine the cooling.
If you wish to set the function’s settings in more detail,
you select “User” mode on the settings menu.

W4.080219
We reserve the right to alter specifications. 15www.swegonhomesolutions.com
The function’s settings can be adjusted from the
Settings/Smart Functions/Fireplace function menu.
Fireplace function
Run time
Speed difference 20%
60 min
Selectable settings for the fireplace function are the
function for the desired operating time (max. 60 min)
and the desired difference in fan speed (max. 50 %). If
problems occur with the chimney draught when lighting
the fire, the percentage value can be increased slightly
from the default value.
Use of the fireplace function repeatedly in extreme cold
can cause freezing in the ventilation unit.
3.3.6 Automatic Home/Away/Boost system
The function is available only on models equipped with a car-
bon dioxide sensor. The automatic control system controls
the ventilation strength variably according to the carbon
dioxide level in the home.
This function should always be set in conjunction with
commissioning.
The function can be activated and set from the Settings/
Smart Functions/Home/Away/Automatic Boost menu.
NOTE! The function is only visible if the sensor has been
detected.
Auto Home/Away/Boost
Mode
A+ now
Home limit
Away limit
750 ppm
900 ppm
600 ppm
In use
The settings menu shows the value “A+now” the
current level of carbon dioxide. The function is set by
defining the limits values Home and Away. A suitable
Home limit value can be determined by reading the
“A+now” value from the menu when a normal number
of people are in the home. Similarly you can determine
the Away limit value by reading the “A+now” value
when the property has been empty for several hours.
3.3.7 Automatic humidity system
The function is available only on models equipped with
a humidity sensor. The function is put into service from
the ”Smart-functions” menu. The function boosts the
ventilation variably based on the moisture load caused
by people, for example, increased moisture load in the
home due to showering. If the home’s moisture level (RH)
remains above 60 % for a long period, we recommend
that the ventilation is boosted and that a check is made of
the moisture source.
The function can be activated and set from the Settings/
Smart Functions/Auto RH control menu.
Compensation (home). Set the Home mode’s com-
pensation value so that the air flows are kept as set out
in the ventilation plan.
Compensation (boost). Fine tune Boost mode’s com-
pensation value if necessary.
Cooker hood boost. Adjust the function’s boost speed
(supply air %), for example, to achieve sufficient dis-
charge velocity or odour extraction.
Choose Roof fan when using a cooker hood whose
extract air does not pass through the ventilation unit.
Compensation is now achieved by slowing the extract
air fan and the cooker hood only controls the roof fan.
Also see the section “Commissioning external equipment”.
When the outdoor air is very cold, you can lower the
supply air fan’s speed so that the supply air temperature
does not drop too much.
3.3.4 Central vacuum function
The central vacuum function helps to balance the
ventilation when using a central vacuum cleaner, which
prevents excessive negative pressure and improves the
cleaning result. A switching signal can be connected
to the ventilation unit’s signal input (IO-control) so that
the function is activated automatically when the central
vacuum is started.
The function can also be started from a Smart control pan-
el, the function then runs until the set time has elapsed.
The function’s settings can be adjusted from the
Settings/Smart Functions/Central vacuum boost menu.
Central vacuum function
Run time
Compensation 20%
0 min
The “Operating time” setting is used to state how
long a function started from Smart functions should be
enabled (maximum 120 minutes). You can adjust the
function's effectiveness using the compensation setting
(max 50 %).
3.3.5 Fireplace function
The smart fireplace function facilitates lighting the fire
and ensures clean combustion. Problems caused by too
little draught in an open fireplace usually occur in the
autumn, when the temperature difference between the
indoor and outdoor air is slight and the chimney is cold.
The Fireplace function attempts to give a temporary
positive pressure in the home when the fireplace is lit,
without changing the fan speeds. After the first phase
passes the fireplace function switches to maintenance
mode and compensates the need of combustion air. The
function can be cancelled from the control panel.
The function can be started from Smart functions or by
enabling the I/O input intended for the fireplace func-
tion (IO-control). The function runs for the set time and
can also be stopped from a Smart control panel.

16
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
NOTE! The function is only visible if the sensor has been
detected. The function is enabled automatically when
the sensor is detected.
Auto humidity control
Mode
Boost limit
Full boost limit
Sauna function
30 % + RH
Sauna boost 5 %
5 % + RH
RH now 30 %
The value “RH now”, the current moisture level, is
shown on the settings menu.
The ventilation starts to be boosted variably when the
extract air’s humidity has risen as much as the Boost
limit value. The Full boost limit value is used to set at
which humidity value in the extract air that full boost is
reached. Boost increases when the value decreases.
If you put automatic Sauna limit into service, the ven-
tilation is boosted with the set value during the sauna.
This function prevents any disruptive variations in the
fan speeds while the sauna is working.
3.3.8 Automatic air quality control
The function is available only on models equipped with
automatic air quality. Automatic air quality boosts the
ventilation variably according to the indoor air quality.
This function should always be set in conjunction with
commissioning.
The function can be activated and set from the Settings/
Smart Functions/Auto air quality control menu. NOTE!
The function is only visible if the sensor has been
detected.
Auto Air Quality control
Mode
Boost limit
Full boost limit 1400 ppm
800 ppm
AQ now 620 ppm
In use
Filter time 2 min
The settings menu shows the value “AQ now” the
current air quality level. The function is set by specifying
the boost limits where you want the ventilation boost
to start and the value at which you want the ventilation
unit to reach maximum boost. Appropriate values can
be established based on the “AQ now” value shown in
the menu.
If it seems that the ventilation system reacts too quickly
to changes in the air quality level, you can increase the
filtering time.
Important
Smart measurements: CO2, RH and VOC.
The absolute values in the measurement
result affect how well the control works.
!!
3.3.9 Temperature boost
Temperature boost is available if an air heater has been
installed in the system, which is available as an acces-
sory, and if you have set room air as the control method
on the “Heating/cooling” method. The function boosts
the air flow so that the required room temperature is
reached.
The function can be activated and set from the Settings/
Smart Functions/Heating boost menu. The function can
be boosted by increasing the boost value.
Temperature boost
Mode
Cooling Gain
Use in away mode
5 %
Heating gain 5 %
In use

W4.080219
We reserve the right to alter specifications. 17www.swegonhomesolutions.com
3.4 Heating/cooling
Commissioning and setting of the heating and cooling
equipment connected to the ventilation unit are per-
formed from this menu. Detailed instructions are sup-
plied together with accessories. As the factory setting,
the ventilation unit normally has internal post heating
that is controlled based on the supply air during the
heating season (post heating’s outdoor air limit). The
setting value for the supply air can be decreased in the
“Away” and “Travelling” operating modes.
Heating / Cooling
Adj. method
Setpoint
Setpoint (away)
17°C
Sensors / controls
Supply air
Setpoint (travelling)
Int. post heater
17°C
Ext. post heater
Post heater out limit
Ext. post cooling
Ext. electric preheater
17°C
Ext. liquid coil
8°C
The measurement value for the supply air and room air
temperature can be fine tuned from the Temperatures/
control functions menu, if the room temperature that is
measured with a separate thermometer deviates from
the temperature shown by the ventilation unit.
Important
Turning off the internal post heating or
lowering the limit value for the outdoor
temperature is not recommended, due to
the risk of condensation.
!!
3.5 Anti-frost protection
Anti-frost protection on the ventilation unit works
automatically. The effect of the anti-frost protection can
be increased if necessary by increasing the “Efficiency”
value.
Defrost settings
Efficiency
Fresh air limit
Supply air limit (min.)
0°C
Supply air limit
14°C
4
Reducing the strength of the ventilation means the
“Supply air limit” value prevents cold air from entering
the duct system.
3.6 Restoring factory settings
Resets all settings made from the control panel, with the
exception of the fan speeds.
3.7 Changing the service code
This menu is used to change the code to access the set-
ting menu.
Enter code
Accept
[ 12 3 4 ]
3.8 Use
Issues with reference to the usage of the ventilation
system are dealt with in the instructions for use supplied
with the unit.

18
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
4.1 Service reminder
The service reminder is activated with preset time inter-
vals and the symbol is displayed on the control panel’s
screen. As a factory setting, the service reminder is not
in operation. It can be put into operation under the
main menu item “Diagnostics”/”Service reminder”. The
recommended service interval for the ventilation unit is
six months.
When servicing has been performed, the service remind-
er is reset from “Alarm” in the main menu.
4.2 To open the ventilation unit
Before you begin any service work, isolate the power
supply voltage to the ventilation unit by pulling out its
electric plug from the wall socket. Wait a few minutes
before you open the inspection door of the ventilation
unit so that the fans have time to stop and possible air
heaters have time to cool down.
The inspection door can be opened by turning the lock
bolt with a screw driver for slotted screw heads.
Turn the service switch to the 0-position prior to com-
mencing servicing.
4.3 Filter
The filters should be replaced at least every six months.
The filters may need to be cleaned or replaced more often
in homes where there is considerable dust or if there are
many impurities in the outdoor air.
The ventilation unit must not be operated without
filters. Use only filters recommended by Swegon in the
ventilation unit. This is important, as filters with exactly
the same appearance and size can have very different
pressure losses and filter capacity. If an incorrect filter is
used, it is not certain that the ventilation unit will work
as designed. Check in the list of components that you
have selected correct filters.
4.4 Heat exchanger
You should check the condition of the heat exchanger
whenever you service the unit.
Withdraw the heat exchanger from the unit for inspec-
tion. Do not damage the heat exchanger fins.
Make sure that the passages through the heat exchang-
er rotor are not clogged and clean them e.g. with run-
ning warm water if required. Never use cleaning agents.
The passages of the heat exchanger should be dry
before you reinstall the heat exchanger in the unit.
4.5 Fans
The ventilation unit’s fans must be checked at least
every two years.
Dismantling the fans for cleaning
• Remove the filters and heat exchanger from the
ventilation unit.
4. Service
Important
The ventilation unit must not be operated
without filters! Only filters from Swegon
may be installed in the ventilation unit.
Find the correct filter in the Section enti-
tled: ”Technical data”.
!!
• Open the locking devices on the fans and loosen the
locks.
• Tilt the lower part of the fan toward the rear wall
until the fan disconnects from the mounting bracket
behind.
• Turn the fan sideways and pull it away from its posi-
tion. Be careful not to damage the insulation on the
electric cables.
• Loosen the fastening screws on the partition wall and
remove the partition wall if necessary.
• If necessary, clean the fan with a soft brush. Be care-
ful not to dislocate the impeller balancing weights. If
significant amounts of dirt collect on the fan impeller
cleaning should be left to a professional.
• Reinstall the fan by sliding it towards the rear wall
and lift it into place, fit the locks.
• Fit the heat exchanger and filter.
The ventilation unit’s fans must be loosened
from their locations and protected, for example,
with plastic bags, while the ventilation ducts are
cleaned.
4.6 Other servicing
Clean the inner surfaces of the ventilation unit by
vacuum cleaning or with a damp cloth, if needed.
Check that dirt has not collected on the surfaces of the
air heater/coolers, clean if necessary.
Check that the condensate discharge outlet is not
clogged and check its outflow by pouring water on
the bottom of the ventilation unit. The condensate
discharge connection is located on the rear of the unit
under the rotary heat exchanger.
Check that the ventilation unit works normally and that
no alarms are shown on the screen or on the cooker
hood.

W4.080219
We reserve the right to alter specifications. 19www.swegonhomesolutions.com
1.Supply air filter, F7 + heat resistant filter
2.Extract air filter, G3
3.Heat exchanger
4.Service switch
1.Extract air fan
2.Supply air fan
3.Condensate discharge connection
4.The fan’s locking device
5.Partition wall
1
2
3
4
1
2
3
4
4
The ventilation unit’s fans must be loosened from their
locations and protected, for example, with plastic bags, while
the ventilation ducts are cleaned.
The figures show the R-model of the ventilation unit.
5
The damper motor can be released if necessary by moving
the release magnet on top of the motor directly opposite
the “magnetic gear release” mark. When the magnet is in
position, the summer bypass damper can be opened or closed
manually.

20
W4.080219
We reserve the right to alter specifications.www.swegonhomesolutions.com
5. Alarms and Troubleshooting
5.1 Alarm, cooker hood
If the ventilation unit controlled by a cooker hood mal-
functions, all signal lamps on the cooker hood’s front
glass light three times at one minute intervals. Contact
an authorised service company.
5.2 Alarm, control panel
Any disruptions to the function of the ventilation unit are
indicated by symbols on the upper row of the base dis-
play. If there is an active alarm in the system, the screen
leaves its standby mode and does not enter standby
mode again as long as the alarm is active. The symbol for
an active alarm is . The condition that has caused the
alarm is shown by the “Alarm” item on the main menu.
A so-called info-alarm remains on the screen when the
active fault condition ceases. The Info alarm can be
reset from “Alarm” on the main menu.
5.3 Troubleshooting
A ventilation system is a unified whole composed
of several system components all of which influence
how the system operates. A malfunction in ventilation
performance could be caused by any component of the
ventilation system or by the way the system has been
installed. If during the ventilation unit’s warranty period
(2 years) after a check (see the enclosed check list) there
are functional disruptions in the ventilation unit, you can
register these using the response form at the address
www.casahelp.fi. There are also instructions, service
Status Alarms Cause Action
T1...T8 sensor fault Sensor is defective or the cable
is loose/not connected.
Contact a service company. The ventilation unit runs
in a restricted operating mode.
Post heater error Supply air too hot, control/air
heater fault or overtemperature
protection has tripped.
Contact a service company! Check the function of
the air heater for reheating and preheating.
Preheater error The temperature of the post
heating coil is too high. Control/
air heater fault or overtempera-
ture protection has tripped.
Contact a service company! Check the function of
the air heater for preheating.
Freeze risk water-
heated air heater
Outdoor temperature below
0 °C and the temperature of
the water has dropped below
the alarm limit.
Ensure that the circulation pump in the waterborne
heating system is running and that the water supply
to the ventilation unit’s air heater is hot enough.
Faulty supply air fan No speed signal from the fan. Contact a service company.
Faulty extract air fan No speed signal from the fan. Contact a service company.
Contact fault Control panel does not commu-
nicate with ventilation unit.
Restart the ventilation unit. Contact the service
company if the error persists.
External emergency
stop/fire alarm
External emergency stop
enabled. The ventilation unit is
stopped by the emergency stop
function even though the sup-
ply air is very cold.
The alarm clears automatically when the external
emergency stop or the fire alarm ceases. No info
alarm remains afterwards.
Service reminder The set service interval has
elapsed.
Service the ventilation unit and acknowledge the
service reminder.
Important
Frost protection function
Ice can form in the heat exchanger during
periods of cold weather if the extract air
is humid. A protective function then auto-
matically reduces the speed of the supply
air fan. Under such conditions, variations in
the fan speed are therefore normal.
Under such conditions, small amounts of
ice can form inside the ventilation unit.
!!
videos and frequently asked questions on the same
website. You directly access a web page with model
specific instructions by reading the QR code on the door
of the ventilation unit with a smartphone.
If a problem or a fault occurs on the ventilation system
after the warranty period (2 years), contact our network
of authorised service companies on www.swegonhome-
solutions.se, your real estate company’s service division
or another service company that is fully conversant with
ventilation repairs.