Flexit Nordic KS3 User manual

INSTALLATION INSTRUCTIONS
Air handling unit with optional kitchen hood connection
Nordic KS3
ART.NO. 800300, 800301
120321-02
2023-05
INSTALLATION
INSTRUCTIONS
Flexit
GO

2
NORDIC KS3
Contents
1. Preliminaries ....................................................................................................................... 6
1.1. Inspection/Maintenance......................................................................................... 6
1.2. Space required......................................................................................................... 6
1.3. Location requirements ........................................................................................... 6
1.4. Recommended sound attenuation for wall-mounting....................................... 7
2. Installation........................................................................................................................... 8
2.1. With kitchen hood ................................................................................................. 10
2.2. Without a kitchen hood ........................................................................................ 10
2.3. What is included?................................................................................................... 11
3. Duct connection................................................................................................................ 12
3.1. Connection to the unit.......................................................................................... 12
4. Electrical work ................................................................................................................... 13
4.1. Automatic control.................................................................................................. 14
4.2. External components............................................................................................ 14
5. System and general drawings......................................................................................... 15
5.1. System drawing (electric heating battery).......................................................... 15
5.2. General drawing .................................................................................................... 15
5.3. Nipple location....................................................................................................... 16
6. Technical data ................................................................................................................... 17
7. Dimensioned drawings .................................................................................................... 18
8. Capacity and sound data ................................................................................................. 19
9. Final checks/Starting ........................................................................................................ 20
9.1. Final checks ............................................................................................................ 20
9.2. Startup and connection of the unit..................................................................... 21
10. Complaints ........................................................................................................................ 22
11. Disposal ............................................................................................................................. 22

3
NORDIC KS3
FRONTFRONT
DANGER! DO NOT
TOUCH
Symbols used
These products bear a number of symbols used for
labelling the actual product and in installation and user
documentation.
Extract air Extract air
from kitchen
Outdoor air
Supply air
Exhaust air
DANGER:
ELECTRICITY
INFO! When a text box is this
FRORXULWbPHDQVWKDWLWFRQWDLQV
important information.
i
CAUTION! When a text box is this
colour, it means that material
damage may be the consequence
of not following the instructions.
!
DANGER! When a text box is
this colour, it means that a life-
threatening or serious personal
injury may be the consequence of
not following the instructions.
!
NOTICE! When a text box is this
colour, it means that a poor
utilisation ratio or product
operating issues may be the
consequence of not following the
instructions.
EXAMPLE OF NIPPLE LOCATIONS
(shown as a right model)
EXAMPLE OF NIPPLE LOCATIONS
(shown as left model)

4
NORDIC KS3
• To avoid the risk of fire, electric
shock or injury, read all the safety
instructions and warning texts
before using the unit.
• There is a fire risk if cleaning is not carried
out in accordance with the instructions.
• All electrical connections must be carried out
by qualified electricians.
• If the power lead is damaged, it must
be replaced by the manufacturer, the
manufacturer’s service agent or a similarly
qualified person.
• The unit must not be used to extract
combustible or flammable gases.
• The air must not be released into extract
air ducts used for air extracted from
appliances which burn gas or other fuel.
• CAUTION! Accessible parts may become
hot when used together with kitchen
equipment.
• Do not flame food under the kitchen hood.
• It is the installer’s responsibility to carry out
a full safety and function assessment of the
appliance.
• WARNING! Failure to install the screws
or fixing device in accordance with these
instructions may result in electrical hazards.
• Follow the current regulations for extract
air.
• Before opening the door: switch off the
KHDWOHWWKHIDQVFRQWLQXHIRUbPLQXWHVWR
remove hot air, unplug the unit and wait 2
minutes before opening the doors, as the
unit contains elements that must not be
touched when hot.
• Connection/disconnection to supply
mains and interconnection of separate
components must be possible.
• Allow disconnection of the appliance after
installation, by accessible plug or a switch in
the fixed wiring.
• Dette apparatet kan brukes av barn over
This appliance may be used by children of 8
years or above or by persons with reduced
!SAFETY
INSTRUCTIONS
!
sensory capacity or reduced physical or
mental capacity, or by persons lacking
experience or knowledge, provided they
have received instruction in the safe use of
the appliance or are supervised to ensure
safe use and providing they are aware of the
risks.
• The product is not suitable for use by
children. Children must not be allowed to
play with the appliance. Children must not
carry out cleaning or maintenance without
supervision.

5
NORDIC KS3
• Tumble dryers must not be
connected to the unit.
• The room must have a separate,
adequate air supply when products
such as gas cookers, gas heaters, fireplaces,
wood-burning stoves, oil-fired boilers, etc.,
are used.
!
• This unit is only designed for
ventilation air in homes and
commercial buildings.
• To maintain a good indoor
climate, comply with regulations and avoid
condensation damage, the unit must never
be stopped apart from during service/
maintenance or in connection with an
accident.
• The unit must not be operated without the
filters being in place.
• All plumbing work must be carried out by
an authorised plumber.
• The location of the water battery must be
approved by a plumber owing to the risk of
water leaks.
• If the supply cord is damaged,
it must be replaced by the
manufacturer, its service agent or
similarly qualified persons in order
to avoid a hazard.
• Applicable for Germany market only:
When the range hood and appliances
supplied with energy other than electricity
are simultaneously in operation, the
negative pressure in the room must not
exceed 4 Pa (4 × 10-5 bar).
i

6
NORDIC KS3
1. Preliminaries
See separate documentation for installation of ducts,
valves, etc.
INFO! The unit is designed for
indoor installation.
i
1.1. INSPECTION/MAINTENANCE
The unit must be installed with space for service and
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fans and recovery system.
The control cable with plug for automatic control on top
of the unit must be easily accessible.
1.2. SPACE REQUIRED
Type A B C
KS3 280 mm 1 mm 300-540 mm
A: Space in front of unit
B: Space at side of unit
C: Space above unit
These are minimum requirements and only take service
needs into account. National statutory requirements for
electrical safety may deviate from this. Check which rules
apply in your country.
1.3. LOCATION REQUIREMENTS
Nordic KS3 has been designed for location in the kitchen
over the cooker as it can contains an integrated kitchen
hood.
The unit can also be placed in other heated rooms and
used without a kitchen hood.
KS3 is available in left or right versions (exhaust air
nipple to the left or right), depending on what is the
most favourable in relation to the duct location.
A = 280 mm
C = 300-540 mm631 mm
598 mm
(unit) (duct cover)
598 mm
B = 1 mm B = 1 mm
572 mm
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Figure 1
Figure 2
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A
B B
C

7
NORDIC KS3
1.4. RECOMMENDED SOUND ATTENUATION FOR WALL-MOUNTING
The wall bracket is used for wall mounting (included).
The unit should preferably not be placed against a wall
where noise is undesirable in the room on the other side
(bedroom).
Insulation, double plasterboards or interrupted studs
can be used to avoid transmission of noise and
vibrations.
15 mm
Where there is a duct enclosure over the unit
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Figure 3

8
NORDIC KS3
2. Installation
Nordic KS3 is designed for installation in the kitchen
above the cooker, see Fig. 7. The unit can also be placed
in other heated rooms and used without a kitchen hood.
KS3 is available in left and right versions, depending on
what is the most suitable for the duct location (see chap.
5.3. Nipple location on page 16.)
The unit can only be installed to hang on a wall (wall
mounting and screws are supplied), see Fig. 4.
Attach the wall mounting to the wall and hang the unit
in place on the upper edge of the mounting bracket.
Remember to attach the damping strips to the mounting
bracket. Hold the unit at an angle when hooking it onto
the wall, see Fig. 5.
The unit must also be attached to the wall at the lower
edge by means of a small attachment plate. This is
necessary, regardless of whether a kitchen hood is con-
nected or not. The attachment plate can be found at the
back of the unit. Turn the plate downwards and attach it
with a screw to the wall (the screw is supplied). See Fig.
6.
For secure mounting, it is necessary to use additional
studs (transoms). The location of these is shown in Fig. 7.
NB The wall must have good sound insulation, see chap.
1.4. Recommended sound attenuation for wall-mounting
on page 7.
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kitchen hood. If tiles are to be attached over the top of
the cooker, there should be no tiles on the wall where
the kitchen hood is installed.
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and the cooker must be at least 45 cm for electric
cookers and at least 65 cm for gas cookers. For the
external dimensions of the unit, see chap. 7. Dimensio-
ned drawings on page 18.
min. 600 mm
Figure 4
Figure 6
Figure 5

9
NORDIC KS3
*min. req. 650mm for gas cookers
Figure 7
Min. req.
450 mm
Recommended
500 mm*
spikerslag
gips
i
so
l
er
i
ng
skruehull, festebrakett
stålkant, volumhett
e
2 mm over uttreks
d
insulation
gypsum
studs (mounting, upper edge)
studs (mounting,
lower edge)
screw hole, mounting bracket
steel edge, volume
hood
upper edge,
moulding
500-650 mm
distance between cooker top and
kitchen hood
Nordic KS3 + Slimline = 770 mm* Nordic KS3 + Facet = 767 mm* Nordic KS3 = 691 mm*
* Dimensions so that the
unit incl. kitchen hood is
on a level with the lower
edge of the top cabinet.
E.g. with 500 mm
between the top cabinet
and worktop, the dis-
tance from the worktop
to the screw hole in the
mounting bracket must
be 500 + 770 mm when
KS3 is used together with
Slimline.

10
NORDIC KS3
2.1. WITH KITCHEN HOOD
Hanging on a kitchen wall.
2.2. WITHOUT A KITCHEN HOOD
Hanging on wall, e.g. in laundry room.
!
There may be a risk of external
condensation on the unit if it
is placed in a room with high
humidity.

11
NORDIC KS3
2.3. WHAT IS INCLUDED?
6x
4x
6x
Figure 8 What is included?
1x
2x

12
NORDIC KS3
Figure 9 Duct connection Figure 10 Fitted ducts
3. Duct connection
3.1. CONNECTION TO THE UNIT
See Figure 9 Duct connection.
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- see the markings on top of the unit and see chap. 5.
System and general drawings on page 15.
Pull the duct insulation well up to the unit.
To prevent condensation, it is particularly important for
the outdoor and exhaust air ducts to have insulation and
a plastic sleeve pulled right down to the unit.
Seal the plastic sleeve to the unit with ties.
All ducts that pass through a cold zone must be
insulated.The ducts normally require min. 50 mm
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required insulation and vapour-proof sleeves being used
in accordance with location/temperature.
Lay the outdoor air duct with a slight incline towards the
outdoor air cap so that any water that enters drains out
again.
Silencers should be installed on the main trunk to
reduce fan noise to the rest of the duct system.
Guide the duct insulation
with plastic jacket right
down to the polystyrene
around the nipple. It is very
important that there are
no gaps between the duct
insulation and the polysty-
rene, as this could lead to
condensation and/or icing.
Pull the duct well over the
seal on the nipple.
Pull the plastic sleeve right
down to the unit.
Fasten the sleeve with ties.

13
NORDIC KS3
4. Electrical work
!
DANGER! All electrical work must
be performed by an authorised
person.
The unit should be installed
with an earth fault breaker.
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for the unit.
The unit is supplied with a 2.8 m cable with plug.
The cable comes out of the top of the unit and is
connected to a 230 V 50 Hz single-phase earthed power
point that is placed in an easily accessible position close
by. The power plug should be used as the service switch.
For fuse sizes see, see chap. 6. Technical data on page
17.
!
Ensure that the plug for
the unit is not boxed in.
Positioning must comply with
individual countries’ electrical
safety legislation. Check which
rules apply in your country.
i
Accessories
Cables are led out of the unit for a 230V network con-
nection, accessories (for example a control panel) etc. It
is important that there is easy access to these contacts
later on – should faults occur or when replacing the unit.
Accessories with a closing contact can be connected to a
3-core cable on top of the unit.
&RQȴJXUDEOHLQSXWV
Marking Colour Function Description
DI1 Brown Speed 3 )RUFHGDLUȵRZVXSSO\DLUH[WUDFWDLU
DI2 Green Speed 4 )RUFHGDLUȵRZVXSSO\DLU
G0 White Reference
Factory default settings.
51 2 43
!
The installation instructions for
the individual products must be
followed.
Cable type
1 Network cable
2 3-core cable (DI1&DI2)
3Cable for control panel (NordicPanel)
4 Not in use (accessories) (Accessories)
5 Power cable, unit
For installation of a control panel, see chap. 9.2. Startup
and connection of the unit on page 21.
Positioning of bushings
for electrical conductors
(shown as a left model)

14
NORDIC KS3
4.1. AUTOMATIC CONTROL
The signal cable must be laid between the unit and the
switch unit. See the separate instructions for automatic
control.
!
Signal cables must be at least 30
cm from power cables, dimmers,
thermostats etc. and should be
laid in a 20 mm wiring conduit at
installation. The cables must not be
more than 24 m long.
4.2. EXTERNAL COMPONENTS
See wiring diagram enclosed with unit.

15
NORDIC KS3
5. System and general drawings
5.1. SYSTEM DRAWING (ELECTRIC HEATING BATTERY)
FI1 FI2
B1
EB FI0
F20
M4HR-R
M1
M2
K
B3/H1B4 B6
Outdoor air Supply air Extract air Exhaust air
(Shown as left-hand model. The right-hand model is inverted.)
5.2. GENERAL DRAWING
Outdoor Supply Extract Exhaust
air air air air
7
2
5
3
6
1
8
4
(Shown as left-hand model. The right-hand model is inverted.)
Abbreviation Description
B1 Supply air temperature sensor
B3 Temperature and humidity sensor, extract air
H1 Humidity sensor, extract air
B4 Outdoor air temperature sensor
B6 Exhaust air temperature sensor
EB Heating battery
F10 Overheating thermostat, manual reset
F20 Overheating thermostat, automatic reset
FI1 6XSSO\DLUȴOWHU
FI2 ([WUDFWDLUȴOWHU
M1 Supply air fan
M2 Extract air fan
HR-R Rotary wheel-type heat exchanger
M4 Rotor motor
K Kitchen hood connection
DA4 Damper
No. Abbreviation Description
1 FI2 ([WUDFWDLUȴOWHU
2 FI1 6XSSO\DLUȴOWHU
3 EB Heating battery
4 F10 Overheating thermostat, manual reset
4 F20 Overheating thermostat, automatic
reset
5 F10 reset button
6 M1 Supply air fan
7 M2 Extract air fan
8 HR-R Rotary wheel-type heat exchanger

16
NORDIC KS3
(Shown as a right-hand model)(Shown as a left-hand model)
5.3. NIPPLE LOCATION
Dimensions in mm.
369
89
509
229
94
202
369
89
509
229
94
202
106
106
106
106
598598
318
Ø125 Ø125
Ø125 Ø125
Ø125
Ø125
Ø125
Ø125
Ø125 Ø125
318

17
NORDIC KS3
6. Technical data
POWER 5DWHGYROWDJH$&b+] 230 V
Frequency 50 Hz
Fuse size 10 A
Rated power, total 679 W
Rated power, max. electric battery 500 W
Rated power, fans 2 x 85 W
Rated power, rotor motor 6 W
VENTILATION Fan type B-wheel
Fan motor control 0-10 V
Max. fan speed RPM 6 500
Automatic control Flexit GO
Heat exchanger Rotating 250*200*2,0
Humidity sensor Integrated
Protection rating IP21
Filter class ePM1 55% (F7)
Filter type (supply air/extract air) &RPSDFWȴOWHU
DIMENSIONS Filter dimensions (WxHxD) 275 x 96 x 132 mm
Weight, ventilation unit 45 kg
Weight, rotor 6,5 kg
Weight, door 7 kg
Weight, fan 0,9 kg
Duct connection Ø 125 mm (sleeve)
Height 631 mm
Width 598 mm
Depth 318 mm
COATING Colour White side/galvanised door
RAL 9003
NCS 0502-B50G
Gloss 55-65
Energy class: A
CTRL 0,65
LOCAL DEMAND CONTROL
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Accessories: App + CO2sensor/
motion sensor + damper
Result: ΔQFUHDVHGDLUȵRZUDWHLQ
zones that need it
ZZZȵH[LWFRP

18
NORDIC KS3
7. Dimensioned drawings
Dimensions in mm.
598598
631
30
318
Ø125

19
NORDIC KS3
8. Capacity and sound data
Capacity diagrams and performance data for the unit
can be found in the product data sheet and in our
calculation program Flexit Select.
Product data sheet
Nordic KS3

20
NORDIC KS3
9. Final checks/Starting
CAUTION! The installer may be
held liable for any incorrect or
defective installation.
9.1. FINAL CHECKS
Check the following points:
Description Chapter Performed
Duct insulation has been carried out
in accordance with the manual and
technical documents
3
Ducts have been connected to the
correct nipples
5
Adjustment has been carried out
in accordance with the manual and
project engineering documents
-
The unit operates normally in all
stages
-
The rotor rotates freely -
Rotor rotates when heating is
required
-
Heating comes on -
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and extract air
-
9