Komfovent DOMEKT C8 automation User manual

EN
DOMEKT
C8 automation
INSTALLATION
MANUAL

EN
CONTENT
1. INTRODUCTION ...........................................................................................................................................................................................................3
1.1. Safety requirements ............................................................................................................................................................................................3
1.2. Design of the units...............................................................................................................................................................................................3
1.2.1. Classication of units by duct connection side .............................................................................................................................5
1.2.2. Switching inspection side of DOMEKT R 200 V..............................................................................................................................6
1.3. Components...........................................................................................................................................................................................................7
1.3.1. Vertical units...............................................................................................................................................................................................7
1.3.2. Flat units.......................................................................................................................................................................................................8
2. UNIT TRANSPORTATION..........................................................................................................................................................................................9
3. MECHANICAL INSTALLATION............................................................................................................................................................................10
3.1. List of parts in the package............................................................................................................................................................................10
3.2. Installation site requirements.......................................................................................................................................................................10
3.2.1. Maintenance area.................................................................................................................................................................................. 10
3.2.2. Humidity in the installation room ...................................................................................................................................................12
3.3. Unit dimensions.................................................................................................................................................................................................12
3.3.1. Vertical units............................................................................................................................................................................................ 12
3.3.2. Flat units....................................................................................................................................................................................................13
3.3.3. Location and dimensions of xture elements.............................................................................................................................13
3.3.4 Dimensions of DOMEKT R 200V with a kitchen hood ............................................................................................................... 14
3.4. DOMEKT R 200 V and kitchen hood installation .................................................................................................................................... 15
3.5. Duct system installation..................................................................................................................................................................................16
3.6. Connection of external heating/cooling units .......................................................................................................................................19
3.7. Connection of condensate drain.................................................................................................................................................................20
4. ELECTRICAL INSTALLATION...............................................................................................................................................................................21
4.1. Electrical input requirements........................................................................................................................................................................ 21
4.2. Connecting electrical components ............................................................................................................................................................21
4.3. Control panel installation............................................................................................................................................................................... 24
4.4. Connecting the unit to an internal computer network or the Internet.........................................................................................25
5. STARTING AND CHECKING THE UNIT............................................................................................................................................................27
5.1. Control panel C6.1.............................................................................................................................................................................................28
5.2. Control panel C6.2.............................................................................................................................................................................................29
5.3. Start-up of the unit using a computer.......................................................................................................................................................29
5.4. Quick check .........................................................................................................................................................................................................31

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1. INTRODUCTION
This manual is intended for qualied technicians installing the DOMEKT air handling unit. Qualied professionals are per-
sons with sucient professional experience and knowledge of ventilation systems, their installation, knowledge of electrical
safety requirements and ability to work without risk to themselves or others.
1.1. Safety requirements
To avoid misunderstandings, read this manual carefully before installing the unit.
Air handling unit may only be installed by a qualied technician in accordance with the instructions given in this manual
and in accordance with applicable legal and safety requirements. The air handling unit is an electrical-mechanical device
that contains electrical and moving parts, therefore, ignoring the instructions in the manual not only shall invalidate the
manufacturer’s warranty but can also cause direct damage to property or human health.
• When performing any kind of work, make sure the unit is unplugged from electrical supply.
• Use caution when working near heaters inside or outside the unit, as their surfaces may be hot.
• Do not connect the unit to the power supply network before all the external assemblies are fully
installed.
• Do not connect the unit to the electrical supply, if there is visible damage that occurred during
transport.
• Do not leave objects or tools inside the unit.
• It is forbidden to operate the unit in the premises where there is a risk of release of explosive
substances.
• Use appropriate personal protective equipment (gloves, goggles) when installing or repairing
the unit.
This sign means that the product may not be disposed of together with your household waste as dened
in Directive (2002/96/EC) and national legislation on the management of WEEE. This product must be dis-
posed of at an appropriate collection point or recycling facility for waste electrical and electronic equipment
(WEEE). Improper handling of this type of waste due to hazardous substances inside electrical and electronic
equipment can endanger the environment and human health. By helping to ensure proper disposal of this
product, you will also contribute to the ecient use of natural resources. For more information on how to
dispose of such waste for further recycling, contact your city authorities, waste management organisations,
approved WEEE systems or your household waste management bodies representatives.
1.2. Design of the units
Domekt CF is an air handling unit with a counter-ow recuperator (heat exchanger). Lamellas of the heat exchange come
in contact with dierent air ows. Exchange of heat or cold takes place between extracted indoor and fresh outdoor air. If no
recuperation is required, the air bypass damper is opened and the heat exchanger is closed. This way the outdoor air passes
around the recuperator and enters the premises directly.
Counter-ow heat
exchanger
Air ter
Air ter
Air bypass
Fan
Fan Heater or
cooler
OUTDOOR
ROOM
Rotary heat
exchanger
Fan Air ter
Fan Heater or
cooler
Air ter
OUTDOOR
ROOM

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Domekt R – air handling units with a rotary recuperator (heat exchanger). The rotating drum of the rotary recuperator
absorbs heat or cold from the air of the premises, transferring it to the fresh outdoor air. If recuperation is not required, the
rotation of the rotary heat exchanger is stopped.
Counter-ow heat
exchanger
Air ter
Air ter
Air bypass
Fan
Fan Heater or
cooler
OUTDOOR
ROOM
Rotary heat
exchanger
Fan Air ter
Fan Heater or
cooler
Air ter
OUTDOOR
ROOM
If the capacity of the heat exchanger is not sucient to reach the temperature set by the user, heaters
or coolers may additionally be switched on1. Heat exchanger and heater (or cooler) are designed to
compensate for heating/cooling losses during the ventilation of the premises, thus AHU is not recom-
mended to be used as main heating/cooling source of the building. AHU may not reach the supply
temperature setpoint if the actual room temperature diers a lot from the desired value, since in that
case heat exchanger capacity will be low.
Counter ow (CF) heat exchangers may freeze at low outside air temperatures. For this reason, these units are equipped
with several dierent frost protection functions:
• Standard – Air-handling unit is stopped when outside air temperature drops below -4°C for longer than 1 hour. Then
the unit is switched on periodically every several hours to check whether the outdoor temperature has increased, if so,
ventilation is resumed.
• Special – when outside air temperature drops below -4°C, the unit slows down supply of cold air and increases extrac-
tion of warm indoor air to ensure that less cold air and more extracted warm air enters the heat exchanger, thus prevent-
ing frost formation inside the heat exchanger. This function is sucient to ensure frost protection for temperatures up
to -10°C. As soon as the outside temperature drops below -11°C, the air-handling unit is stopped because an additional
heater is necessary to protect the heat exchanger under such temperature conditions.
Special frost protection mode changes the balance of airows, which may lead to pressure dieren-
ces indoors, therefore, this mode is not recommended in very airtight buildings (A+ or higher energy
eciency class) or in houses with a replace.
• External pre-heater – by measuring indoor humidity as well as indoor and outdoor air temperatures, the exact weather
conditions are calculated when the heat exchanger might freeze. Then the pre-heater is switched on and operated in a
way to ensure that the temperature of air entering the air-handling unit is always higher than the freezing point. External
pre-heater is controlled by 0..10 V signal. It may be electric or water heater (water–glycol solution). Use of a pre-heater for
frost protection of the counter ow heat exchanger requires humidity control. Humidity sensor is integrated in a remote
controller that must be installed in ventilated premises (do not leave this remote controller on the air handling unit). If
you operate your unit with your smart phone or computer instead, you should install a separate humidity sensor (see
Chapter “Electrical Installation”).
For information on how to set a frost protection mode2, see “Domekt User Manual”.
1 Depends on the unit components.
2 Only in CF units.

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1.2.1. Classication of units by duct connection side
Depending on the installation and connection of the ducts, the air handling units are divided into:
• Vertical units – when all ducts are connected at the top.
• Flat units – thinner units are designed for mounting over suspended ceilings. All ducts are connected at the sides of the unit.
Vertical unit Flat unit
Fig. 1. Classication of units by duct connection
Also, each unit may be left or right inspection side1. The inspection side indicates which side of the unit contains the air
supply duct to the premises.
Air duct to the premises
Right inspection side Left inspection side Right inspection side Left inspection side
Air duct to the premises
Fig. 2. Classication of units by inspection side
1 Depends on your order.

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1.2.2. Switching inspection side of DOMEKT R 200 V
DOMEKT R 200 V is a universal unit and its inspection side may be easily switched during installation. Inspection side is
changed by removing front and back panels (fastened with screws) and rotating the unit.
SUP
SUP
SUP - supply air duct connection.
This air handling unit is designed to be integrated into the kitchen furniture (front panel has mounting plates for furni-
ture panel; see Section 3.4). In other cases, when the unit is mounted on a wall, you can remove these mounting plates and
swap the front and back panels for the unit to look nicer.

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1.3. Components
Below are the principal diagrams of air handling units, including the marking of assemblies of the unit.
1.3.1. Vertical units
DOMEKT R 200 V Domekt CF 200 V - CF 300 V
66
A B
C
D E
A BCDE
FF
3
4
5
2
9
10
8
A
B C
D
E
A
BC
D
ED
AC
BD
A
C
B
DABC
78 5 7 85
1
4
3
6
10
2
DA BC
RIGHT INSPECTION SIDE LEFT INSPECTION SIDE RIGHT INSPECTION SIDE LEFT INSPECTION SIDE
ODA A – outdoor intake air
SUP B – air supplied to the premises
ETA C – air extracted from the premises
EHA D – exhaust air
E – additional extraction
(air bypass without recuperation)
F – kitchen hood connection
1– counter-ow heat exchanger
2– supply air fan
3– extract air fan
4– electric heater
5– outdoor air lter
6– extract air lter
7– condensate drainage
8– air bypass damper
9– rotary heat exchanger
10 – C8 controller main board

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EN
1.3.2. Flat units
Domekt R 300 F
RIGHT
INSPECTION
SIDE
A
D
E
C
B
9
9
4 3
256 10
A
D
E
C
B
9943 2
5 6
10
LEFT
INSPECTION
SIDE
Domekt CF 200 F
RIGHT
INSPECTION
SIDE
B
C
D
A
12 46 57 8 3
10
B
C
D
A
124 65 7 8 10
3
LEFT
INSPECTION
SIDE
Domekt CF 250 F
RIGHT
INSPECTION
SIDE
13 45 67 8 210 1 34 56 782 10
B
C
D
A
B
C
D
A
LEFT
INSPECTION
SIDE
ODA A – outdoor intake air
SUP B – air supplied to the premises
ETA C – air extracted from the premises
EHA D – exhaust air
E – additional extraction
(air bypass without recuperation)
F – kitchen hood connection
1– counter-ow heat exchanger
2– supply air fan
3– extract air fan
4– electric heater
5– outdoor air lter
6– extract air lter
7– condensate drainage
8– air bypass damper
9– rotary heat exchanger
10 – C8 controller main board

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2. UNIT TRANSPORTATION
Equipment must be transported and stored in the original packaging. During transportation, equipment must be prop-
erly secured and further protected against possible mechanical damage, rain or snow.
L
≥L
Fig. 3. Examples of equipment packaging
Forklift truck or crane can be used for loading or unloading. For the crane operation, special lashes or ropes must be
used to securing them in the designated areas. Ensure that lifting lashes or ropes do not crush or otherwise damage the
housing of the unit. We recommend using special belt supports. When lifting and transporting the equipment with a forklift,
the forks must be long enough to prevent the unit from being overturned or mechanically damaging its bottom side. Air
handling units are heavy, therefore, be careful during lifting, moving or transportation. Use personal protective equipment.
Even small units should be transported on a forklift, a trolley or carried by multiple persons.
L
≥L
Fig. 4. Examples of transportation by crane, forklift and trolley
After delivery of the air handling unit, carefully inspect its packaging for damage. If mechanical or other damage is visible
(e.g., wet cardboard packaging), notify the carrier immediately. If the damage is signicant, do not accept the unit. Inform the
selling company or the representative of UAB KOMFOVENT within three business days about any damage detected during
delivery.1
Units should be stored in a clean, dry room at a temperature of 0-40 °C. When selecting a storage location, make sure the
unit is not accidentally damaged, that other heavy objects are not loaded on top and dust or moisture does not get inside
the unit.
1 UAB KOMFOVENT is not responsible for losses caused by the carrier during transportation and unloading.

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3. MECHANICAL INSTALLATION
3.1. List of parts in the package
Before installing the unit, check for any missing parts. If something is missing from the list, contact the company that sold
the air handling unit.
1. Air handling unit.
2. Control panel C6.1 or C6.21.
3. Control panel cable.
4. Unit suspension brackets2.
5. Mounting bolts for brackets3.
6. User guide.
7. Installation manual.
3.2. Installation site requirements
DOMEKT units are designed for installation in household or technical rooms with an air temperature of 0 °C to +40 °C,
relative humidity from 20% to 80% (non-condensing). It is recommended to install the air handling unit in a separate room or
in an insulated attic on a solid, level base with vibration damping mat. We recommend not to rest the unit against the wall to
prevent noise or vibration and accumulation of moisture or mould on the wall due to condensation.
It is forbidden to install DOMEKT air handling units outdoors. They are also not designed for ventila-
tion or dehumidication of humid premises (swimming pools, baths, car washes, etc.).
3.2.1. Maintenance area
When selecting the installation or mounting location of the unit, provide unrestricted and safe access to the equipment
for its repair or preventive maintenance. The inspection opening (if any) should not be less than the size of the unit and the
installation must allow easily dismantlement if necessary (e.g. in the case of complicated repairs). Minimum space for main-
tenance refers to an area free of any xed or immovable equipment, constructions, walls, structures or furniture.
Some DOMEKT units can be mounted on walls, whereas thinner DOMEKT units are designed for ceiling mounting. Re-
gardless of the mounting type (wall or ceiling), the unit must be tted with anti-vibration gaskets so that the vibrations of the
unit are not transmitted to the structure. For wall mounted units: anti-vibration strips are attached to the top and bottom of
the backside (at mounting brackets) so that the gaskets are pressed against the wall when the unit is mounted. Some units
are supplied with factory tted anti-vibration gaskets; in other cases, they are supplied separately.
1Depends on your order.
2, 3 Only for units to be mounted on the wall or ceiling.

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Wall mounted
units:
Domekt R 200 V
Domekt CF 200 V - 300 V
30 cm30 cm
30 cm
70 cm
Flat units are attached
to the ceiling:
Domekt R 250 F
Domekt CF 200 F - 250 F
10 cm
5 cm 5 cm
30 cm
30 cm
5 cm
5 cm
Suspended
ceilings Service opening
Flat units that can be wall-mounted or placed on the oor:
Domekt R 300 F
120 cm
30 cm30 cm
30 cm
30 cm
30 cm
30 cm
30 cm
120 cm
Fig. 5. Minimum space for maintenance
• It is forbidden to drill or screw into the casing of the unit, in places not provided for purpose, as there
is a danger of damaging cables or tubes inside the housing.
• Domekt CF 200 F, CF 250 F at units must be tted with a 15 mm slope on the drainage side to facili-
tate the discharge of condensate from the unit.
• Only these units can be mounted on the ceiling or wall and only in such positions as specied in
Fig. 5.

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3.2.2. Humidity in the installation room
If the unit is installed in a room with high humidity, condensation may occur on the walls of the unit in cold weather con-
ditions. Newly built ats or homes have high probability of condensation, especially in the rst year, until the construction or
nishing materials haven’t dried up completely. When installing the unit in the rooms with a high probability of condensa-
tion (For example, in bathrooms), it is necessary to ensure that the condensate does not damage the building structures or
furniture.
To reduce condensation on the outside of the AHU, the following is recommended:
• maintain a lower relative humidity in the room where the AHU is installed;
• install a pre-heater to increase the air temperature of the outdoor air entering the unit.
• if the air is drier outside, you can increase the ventilation intensity and the temperature settings so that the rooms are
dried faster. For this purpose, you can also use the “Humidity control function” (see “Domekt User Guide”).
If the unit is shut down in cold outside temperatures, due to free air circulation, condensate can form inside of the unit,
therefore, it is important to install air closing dampers (motorized are recommended) to close the air intake and exhaust
openings when the unit is OFF. This will prevent cold air from the outside and warm air from the premises to enter the unit.
We recommend that you always keep the unit turned on and use it at minimum of 20% intensity even
if no ventilation is required. This will ensure good indoor climate conditions and reduce condensation
inside the unit, which might damage electronic components.
CF air handling units with a counter-ow heat exchanger are prone to condensation at low outdoor
temperatures. For this reason, these units must be equipped with a proper condensate drainage sys-
tem (see Chapter“Connection of a Condensate Drain”).
3.3. Unit dimensions
3.3.1. Vertical units
H1
H
L
h5
B
b1
b2
b3
e2
b4
l3 l1
l4 l2
e1
h4
h1h2
h3
e1
e2
B
b1
b2
H
b4
b3 L1
L
h5
L1
L
b4
b1b2
b3
h1
e1
H
e2
B B1
H1
H
L
h5
B
b1
b2
b3
e2
b4
l3 l1
l4 l2
e1
h4
h1h2
h3
e1
e2
B
b1
b2
H
b4
b3 L1
L
h5
L1
L
b4
b1b2
b3
h1
e1
H
e2
B B1
Unit Inspection
side
Dimensions, mm
HH1 L B b1 b2 b3 b4 l1 l2 l3 l4 h5 e1 e2
Domekt R 200 V Right 655 625 600 325 95 230 95 230 81 226 226 81 – 81 95
Left 655 625 600 325 95 230 95 230 81 226 226 81 – 519 230
Domekt CF 200 V Right 790 790 600 630 110 360 110 360 110 110 110 110 47 – –
Left 790 790 600 630 110 360 110 360 110 110 110 110 47 – –
Domekt CF 300 V Right 790 790 600 630 110 360 110 360 110 110 110 110 47 – –
Left 790 790 600 630 110 360 110 360 110 110 110 110 47 – –

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3.3.2. Flat units
H1
H
L
h5
B
b1
b2
b3
e2
b4
l3 l1
l4 l2
e1
h4
h1h2
h3
e1
e2
B
b1
b2
H
b4
b3 L1
L
h5
L1
L
b4
b1b2
b3
h1
e1
H
e2
B B1
Unit Inspection
side
Dimensions, mm
H L L1 BB1 b1 b2 b3 b4 h1 e1 e2
Domekt R 300 F Right 280 1120 1090 633 630 135 145 135 145 125 275 170
Left 280 1120 1090 633 630 135 145 135 145 125 815 170
Domekt CF 200 F Right 294 1100 1100 560 560 147 114 112 195 119 – –
Left 294 1100 1100 560 560 195 112 114 147 119 – –
Domekt CF 250 F Right 294 1278 1250 604 604 142 162 192 162 134 – –
Left 294 1278 1250 604 604 192 162 142 162 134 – –
3.3.3. Location and dimensions of xture elements
Special brackets, wall screws with plastic bushings and self-tapping screws are provided for mounting the units. When
mounting the units, care must be taken to ensure that vibrations of the unit are not transmitted to the building structures,
as it may lead to additional noise. In order to eliminate vibrations, additional anti-vibration gaskets are attached to the back
wall of the unit. In case of ceiling-mounted units, vibration absorbers are integrated in mounting brackets.
The following are the types of mounting brackets and mounting dimensions.
Domekt R 200 V
682
560
140
583
1
Domekt CF 200 V - CF 300 V
115
265
530
665
Domekt CF 200 F
600
500
500 600
AB
2
Unit A, mm B, mm
Domekt R 300 F 1030 681
Domekt CF 250 F 1190 655
1– Adhesive anti-vibration gasket
2– Rubber vibration absorbers

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3.3.4 Dimensions of DOMEKT R 200V with a kitchen hood
R 200 V air handling units may be supplied with two types of kitchen hoods. These units are designed to be integrated
into the kitchen furniture above the cooker. Available kitchen hoods are equipped with a damper that closes airow when
not in use. When kitchen hood is on, the damper is opened and air from the cooker is extracted directly to the exhaust air
duct, bypassing the rotary heat exchanger.
The following are the dimensions of the unit and mounting dimensions for a standard or 392-12 kitchen hood.
Dimensions with a standard kitchen hood
42
625
~777
500
804
325
42
94
625 738
325
140 x 4 = 560
140
25
600
140
575
600
140 x 4 = 560
Dimensions with 392-12 kitchen hood
42
625
~777
500
804
325
42
94
625 738
325
140 x 4 = 560
140
25
600
140
575
600
140 x 4 = 560

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3.4. DOMEKT R 200 V and kitchen hood installation
Standard or 392-12 kitchen hoods are mounted at the bottom of the unit prior to the installation in the kitchen cabinet.
In order to install a kitchen hood, remove a bottom cover of the unit by unscrewing the screws.
1Mounting plates for furniture panel
2Bottom cover
3Tin screws 4,2x13
4Standard kitchen hood
5Adapter for 392-12 kitchen hood
6Kitchen hood 392-12
7M4 screws for xing the kitchen hood
5
6
3 x10
7 x4
4
7 x4
1
2
3 x10
Front panel of R 200 V unit is equipped with mounting plates for furniture panel mounting. Mounting plates are screwed
to a furniture panel and then the panel can be hung on the front of the unit.

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Dimensions for mounting furniture panel
22
625
600
500
250
22
32.5
500
250
32.5
Ø 2(deph – 5 mm) 16 holes
3.5. Duct system installation
The air in and out of the unit ows through the duct system. The duct system should be designed and selected to have
low airow rates and low pressure dierentials, ensuring more accurate airow rates, lower energy consumption, lower
noise levels and longer life of the unit.
Outdoor vents must be installed as far apart as possible on dierent sides of the building to prevent the exhaust air from
returning to the air intakes. Try to install the air intake vents where the outdoor air is the cleanest: do not direct them towards
the street, car park or outdoor replace. We also recommend installing the air intake vent on the north or east side of the
building, where the heat of the sun in summer will not have a signicant eect on the supply air temperature.
It is highly recommended to install unit connecting ducts of supply inlet and exhaust outlet with a minimum slope on the
outside of the premise, to avoid water owing into the unit in case of rain or snow.
S
EN
W
min. 1,8 m
min. 1 m
Air exhaust vent
Air intake vent
min. 1,8 m
min. 3 m
min. 3 m
It is recommended to insulate the ducts in unheated rooms (attic, basement) to avoid heat loss. It is also recommended
to insulate the supply air ducts if the unit is used for room cooling.

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The air ducts are tted to the unit with self-tapping screws. Dierent air ow duct positions are marked on the sticker
located on the AHU:
outdoor intake air
air supplied to the premises
air extracted from the premises
outdoor exhaust air
AODA
BSUP
CETA
DEHA
A
D
B
C
L1
Domekt CF 200/300 V
EHA
ODA
ETA
SUP
Fig. 6. Air duct marking
Most units with a rotary heat exchanger also have a fth branch (labelled E) to connect an additional exhaust duct (see
1.3. section). The air ow through this opening is delivered directly to the exhaust fan, bypassing the heat exchanger, there-
fore, you can connect ducts from the bathroom, toilet or kitchen without worrying that odours and bacteria will contaminate
the rotary heat exchanger or be passed on to the supplied air ow. However, air is extracted through an additional branch
without recuperation, thus reducing the eciency of the heat exchanger. For this reason, we do not recommend using the
extra air extraction continuously. An additional exhaust duct should be tted with air closing damper (motorized are recom-
mended) and should only be opened when additional extraction is required (e.g. when bathing). If the additional branch is
connected to the kitchen hood with an integrated closing damper, an additional damper is not needed.
2
5
4
3
6
1
WC
1
2
3
4
5
6
C8 controller board
Switch
Spring return actuator with end position
contacts (e.g. Belimo LF-230S)
Air closing damper
Additional extraction duct
Air handling unit
Fig. 7. Example of mounting of an additional air extraction duct

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EN
• Ducts connecting the unit to the exterior of the building must be insulated (insulation thickness
50–100 mm) to prevent condensation on cold surfaces.
• Air intake and exhaust ducts must be tted with air closing dampers (mechanical spring-loaded
or electric with actuators) to protect the unit from exposure to climatic conditions when the unit
is switched o.
• In order to minimise AHU noise transferring through the ducts into ventilated areas, sound
attenuators must be connected to the unit.
• Duct system elements must have separate brackets and to be mounted in a way that their weight
is not shifted to the unit casing.
• The kitchen hood with integrated exhaust fan must not be connected to the additional air ex-
haust duct. Such hood must be connected to a duct separated from the general ventilation
system.
The diameter of the ducts varies by unit model:
Unit
Domekt R 200 V Domekt R 300 F
Domekt CF 200 F
Domekt CF 200 V
Domekt CF 250 F
Domekt CF 300 V
Duct diameter,
mm
Duct A 125 160 160
Duct B 125 160 160
Duct C 125 160 160
Duct D 125 160 160
Duct E 125 125 –

19
UAB KOMFOVENT we reserve the right to make changes without prior notice
DOMEKT_C8_21-01
3.6. Connection of external heating/cooling units1
The following devices may be additionally connected to DOMEKT air handling units:
• Water heater.
• Water cooler.
• Direct expansion (DX) cooler/heater.
• Pre-heater (electric or water-glycol).
These accessories are intended for installation inside the supply air duct (except for the pre-heater). Pre-heater shall be
installed inside the outdoor air duct, upstream the air handling unit. A qualied specialist must perform all connections to
the heating or cooling system piping.
Non-freezing water-glycol mixture must be used as heat medium in a water pre-heater.
When connecting the heater/cooler pipes, they must be supported by a box spanner – otherwise they will be damaged. If
water is used in the heater, for frost protection water temperature sensor (B5), must be installed. It is screwed into the special
hole on the return water pipe. The sensor must be thermally insulated so that the room temperature does not distort water
temperature measurements.
Fig. 8. Connecting the water heater/cooler hoses and installing the water temperature sensor
When operating the unit with negative outdoor temperature, a water-glycol mixture must be used
as heat medium in a water heater or cooler or it is necessary to ensure a return water temperature of
at least 25 °C.
Pipework package2must include circulation pump, which circulates heating/cooling medium
through the coil (smaller circuit) and 3-way mixing valve with modulated actuator. In cases if 2-way
valve is used, additionally it must be installed non-return valves to ensure continuous circulation
around smaller circuit. PPU must be installed as close to the water coil as possible.
2
Heat exchanger coil of DX coolers/heaters are factory-lled with nitrogen gas. Before connecting heat exchanger coil to
the refrigerant system, the nitrogen gas is discharged through a valve which is then cut o and coil connections are soldered
to the pipeline.
1Ordered separately.
2 It is recommended to use PPU made by Komfovent.

20 UAB KOMFOVENT we reserve the right to make changes without prior notice
DOMEKT_C8_21-01
EN
3.7. Connection of condensate drain
In Domekt CF units with counter-ow plate recuperator, condensate is formed due to the dierence between indoor and
outdoor temperature, therefore, units of this type are equipped with condensate drip pans and drainage outlets. Due to the
negative air pressure in the air handling unit, the water cannot drain out of the condensate collection tray by itself, therefore, it
is necessary to connect a siphon or a siphon with a one-way valve to the drain pipe.
Ø 15 mm
Ø 15 mm
40 mm
80 mm
80 mm
40 mm
Fig. 9a. Installation of a siphon without one-way valve
The drainage pipeline must be mounted with a slope, without any constrictions or loops, which might prevent water from
draining easily. If the drainage pipeline passes through the outdoors or unheated premises, it must be adequately insulated
or equipped with a drainage heating cable to prevent water freezing in winter. Any drainage system cannot be directly con-
nected to the wastewater system in order to prevent the transmission of odours and bacteria into the supply air. Condensate
from the drain of the air handling unit must be collected in a separate container or into the sewage grate without direct con-
tact: do not connect drain directly to sewer pipe and do not immerse it into water. The condensate collection point should
be easy to clean and disinfect.
Fig. 9b. Condensate drain connection to sewer system