Komfovent DOMEKT C8 Automation Installation Manual

1. Introduction

This manual is intended for qualified technicians installing the DOMEKT air handling unit. Qualified professionals are persons with sufficient 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 qualified 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 indicates that the product may not be disposed of together with your household waste as defined in Directive (2002/96/EC) and national legislation on the management of WEEE. This product must be disposed 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 efficient 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 units are air handling units with a counter-flow recuperator (heat exchanger). Lamellas of the heat exchange come in contact with different air flows. 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.

Diagram Description (Fig. 1): Classification of units by duct connection. Shows a 'Vertical unit' with ducts connected at the top and a 'Flat unit' with ducts connected at the sides, designed for suspended ceilings.

Diagram Description (Fig. 2): Classification of units by inspection side. Shows units with 'Right inspection side' and 'Left inspection side', indicating the position of the air supply duct to the premises.

Domekt R units are 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.

If the capacity of the heat exchanger is not sufficient to reach the temperature set by the user, heaters or coolers may additionally be switched on. Heat exchanger and heater (or cooler) are designed to compensate for heating/cooling losses during the ventilation of the premises, thus AHU is not recommended to be used as main heating/cooling source of the building. AHU may not reach the supply temperature setpoint if the actual room temperature differs a lot from the desired value, since in that case heat exchanger capacity will be low.

Counter flow (CF) heat exchangers may freeze at low outside air temperatures. For this reason, these units are equipped with several different 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 extraction of warm indoor air to ensure that less cold air and more extracted warm air enters the heat exchanger, thus preventing frost formation inside the heat exchanger. This function is sufficient 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.

Note: Special frost protection mode changes the balance of airflows, which may lead to pressure differences indoors, therefore, this mode is not recommended in very airtight buildings (A+ or higher energy efficiency class) or in houses with a fireplace.

• 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 flow 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 mode, see "Domekt User Manual".

1.2.1. Classification 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 designed for mounting over suspended ceilings. All ducts are connected at the sides of the unit.

Diagram Description (Fig. 1): Classification of units by duct connection. Shows a 'Vertical unit' with ducts connected at the top and a 'Flat unit' with ducts connected at the sides, designed for suspended ceilings.

Also, each unit may have a left or right inspection side. The inspection side indicates which side of the unit contains the air supply duct to the premises.

Diagram Description (Fig. 2): Classification of units by inspection side. Shows units with 'Right inspection side' and 'Left inspection side', indicating the position of the air supply duct to the premises.

1.2.2. Switching Inspection Side of DOMEKT R 190 VT - R 200 VT

DOMEKT R 190 VT - R 200 VT 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.

Diagram Description: Shows the process of switching the inspection side by removing and rotating panels. 'SUP' indicates the supply air duct connection.

This air handling unit is designed to be integrated into kitchen furniture (front panel has mounting plates for furniture panel; see Section 3.3.5.). 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.

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

Diagram Description: Principal diagrams of vertical units (Domekt R 190 VT-R 200 VT and Domekt R 300 V) showing air inlets/outlets and component locations for both Right and Left inspection sides. Key components are labeled with numbers and corresponding text descriptions.

Key to Components:

• ODA: Outdoor air
• SUP: Supply air
• ETA: Extract air
• EHA: Exhaust air
• ETB: By-pass extraction (without heat recovery)
• ETH: Kitchen hood connection (without heat recovery)
• 1: Counter-flow heat exchanger
• 2: Supply air fan
• 3: Extract air fan
• 4: Electric heater
• 5: Outdoor air filter
• 6: Extract air filter
• 7: Condensate drainage
• 8: Air bypass damper
• 9: Rotary heat exchanger
• 10: C8 controller main board

1.3.2. Flat Units

Diagram Description: Principal diagrams of flat units (Domekt R 150 F, Domekt R 300 F, and Domekt CF 200 F) showing air inlets/outlets and component locations for both Right and Left inspection sides. Key components are labeled with numbers and corresponding text descriptions.

Key to Components:

• ODA: Outdoor air
• SUP: Supply air
• ETA: Extract air
• EHA: Exhaust air
• ETB: By-pass extraction (without heat recovery)
• ETH: Kitchen hood connection (without heat recovery)
• 1: Counter-flow heat exchanger
• 2: Supply air fan
• 3: Extract air fan
• 4: Electric heater
• 5: Outdoor air filter
• 6: Extract air filter
• 7: Condensate drainage
• 8: Air bypass damper
• 9: Rotary heat exchanger
• 10: C8 controller main board

2. Unit Transportation

Equipment must be transported and stored in the original packaging. During transportation, equipment must be properly secured and further protected against possible mechanical damage, rain or snow.

Diagram Description (Fig. 3): Examples of equipment packaging, showing units in boxes secured with straps.

Forklift truck or crane can be used for loading or unloading. For crane operation, special lashes or ropes must be used for securing them in designated areas. Ensure that lifting lashes or ropes do not crush or otherwise damage the housing of the unit. Special belt supports are recommended. When lifting and transporting 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; 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.

Diagram Description (Fig. 4): Examples of transportation by crane, forklift, and trolley, illustrating safe and unsafe lifting methods.

After delivery, carefully inspect the unit's packaging for damage. If mechanical or other damage is visible (e.g., wet cardboard packaging), notify the carrier immediately. If the damage is significant, 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.

Units should be stored in a clean, dry room at a temperature of 0-40°C. When selecting a storage location, ensure the unit is not accidentally damaged, that other heavy objects are not loaded on top, and that dust or moisture does not get inside the unit.

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 C6.2 (depends on order).
• 3. Control panel cable.
• 4. Unit suspension brackets (for wall/ceiling mounting).
• 5. Mounting bolts for brackets (for wall/ceiling mounting).
• 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 and 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. Avoid resting the unit against a 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 ventilation or dehumidification of humid premises (swimming pools, baths, car washes, etc.).
• ⚠️ Make sure that children will not reach and will not play with the air handling unit without adult supervision.

With additional accessories, DOMEKT R units can also be installed in unheated premises (e.g., an attic) where ambient temperature is below 0°C. In this case, additional air closing dampers must be installed in the supply and extract air ducts (on the room side). This should prevent warm indoor air from circulating inside the unit when it is stopped, to avoid condensation damage to electronic components. It is also necessary to insulate all ducts passing through unheated rooms.

3.2.1. Maintenance Area

When selecting the installation or mounting location, 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 easy dismantlement if necessary (e.g., for complicated repairs). Minimum space for maintenance refers to an area free of any fixed 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. Regardless of the mounting type (wall or ceiling), the unit must be fitted with anti-vibration gaskets so that vibrations 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 press against the wall when mounted. Some units are supplied with factory-fitted anti-vibration gaskets; in other cases, they are supplied separately.

Diagram Description (Fig. 5): Minimum space for maintenance. Shows required clearances around wall-mounted units (Domekt R 190 VT-R 200 VT, Domekt R 300 V), ceiling-mounted flat units (Domekt R 150 F, Domekt R 300 F, Domekt CF 200 F), and wall-mounted or floor-mounted flat units (Domekt R 150 F, Domekt R 300 F).

• ⚠️ 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 flat units must be fitted with a 15 mm slope on the drainage side to facilitate the discharge of condensate from the unit.
• Only these units can be mounted on the ceiling or wall and only in such positions as specified in Fig. 5.

3.2.2. Humidity in the Installation Room

If the unit is installed in a room with high humidity, condensation may occur on the unit's walls in cold weather conditions. Newly built flats or homes have a high probability of condensation, especially in the first year, until construction or finishing materials have dried up completely. When installing the unit in rooms with a high probability of condensation (e.g., in bathrooms), ensure that the condensate does not damage 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, increase ventilation intensity and temperature settings to dry rooms faster. The "Humidity control function" (see "Domekt User Guide") can also be used for this purpose.

If the unit is shut down in cold outside temperatures, condensate can form inside the unit due to free air circulation. 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 from entering the unit.

• ⚠️ We recommend keeping the unit turned on and using it at a minimum of 20% intensity even if no ventilation is required. This ensures good indoor climate conditions and reduces condensation inside the unit, which might damage electronic components.

CF air handling units with a counter-flow heat exchanger are prone to condensation at low outdoor temperatures. For this reason, these units must be equipped with a proper condensate drainage system (see Chapter "Connection of a Condensate Drain").

3.3. Unit Dimensions

3.3.1. Vertical Units

Diagram Description: Shows dimensions for vertical units (Domekt R 190 VT, Domekt R 200 VT, Domekt R 300 V) with labels for height (H, H1), length (L), width (B), and various connection/component dimensions (b1-b4, l1-l4, h5, e1-e2).

3.3.2. Flat Units

Diagram Description: Shows dimensions for flat units (Domekt R 150 F, Domekt R 300 F, Domekt CF 200 F) with labels for height (H), length (L, L1), width (B, B1), and various connection/component dimensions (b1-b4, h1, e1-e2).

3.3.3. Location and Dimensions of Fixture 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. To eliminate vibrations, additional anti-vibration gaskets are attached to the back wall of the unit. In the case of ceiling-mounted units, vibration absorbers are integrated into the mounting brackets.

The following are the types of mounting brackets and mounting dimensions.

Diagram Description: Shows mounting bracket dimensions for Domekt R 190 VT-R 200 VT, Domekt R 300 V, and Domekt CF 200 F. Also includes a table with dimensions A and B for Domekt R 150 F and Domekt R 300 F. Key: 1 - Adhesive anti-vibration gasket, 2 - Rubber vibration absorbers.

3.3.4. Dimensions of DOMEKT R 190 VT - R 200 VT with a Kitchen Hood

R 190 VT - R 200 VT air handling units may be supplied with two types of kitchen hoods. These units are designed to be integrated into kitchen furniture above the cooker. Available kitchen hoods are equipped with a damper that closes airflow when not in use. When the kitchen hood is on, the damper opens, 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 kitchen hood.

Diagram Description: Shows dimensions for units with kitchen hood 1224G-12 and 392-12, including unit dimensions and mounting details.

3.3.5. DOMEKT R 190 VT - R 200 VT and Kitchen Hood Installation

1224G-12 or 392-12 kitchen hoods are mounted at the bottom of the unit prior to installation in the kitchen cabinet.

• ⚠️ In order to install a kitchen hood, remove a bottom cover of the unit by unscrewing the screws.

Diagram Description: Illustrates the installation of kitchen hoods (1224G-12 and 392-12) to the unit, showing parts like mounting plates, bottom cover, screws, and adapters.

The kitchen hood wires are connected to the terminal block at the bottom of the unit.

The front panel of R 190 VT - R 200 VT units 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.

Diagram Description: Shows dimensions for mounting a furniture panel, including hole patterns and overall dimensions.

3.4. Duct System Installation

The air in and out of the unit flows through the duct system. The duct system should be designed and selected to have low airflow rates and low pressure differentials, ensuring more accurate airflow rates, lower energy consumption, lower noise levels, and longer life of the unit.

Outdoor vents must be installed as far apart as possible on different sides of the building to prevent exhaust air from returning to the air intakes. Install air intake vents where the outdoor air is cleanest; do not direct them towards the street, car park, or outdoor fireplace. Installing the air intake vent on the north or east side of the building is also recommended, where the summer sun's heat will have less effect 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 flowing into the unit in case of rain or snow.

Diagram Description (Fig. 6): Air duct marking. Shows a unit with ports labeled ODA (outdoor air), SUP (supply air), ETA (extract air), and EHA (exhaust air). Also includes a wind rose and minimum distance recommendations for vents.

It is recommended to insulate ducts in unheated rooms (attic, basement) to avoid heat loss. Insulating supply air ducts is also recommended if the unit is used for room cooling.

The air ducts are fitted to the unit with self-tapping screws. Different air flow duct positions are marked on the sticker located on the AHU.

3.5. Connection of External Heating/Cooling Units

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). The pre-heater shall be installed inside the outdoor air duct, upstream the air handling unit. A qualified 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 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, a water temperature sensor (B5) must be installed and fixed with a strap on the return water pipe as close to the heater as possible. Fix the sensor so its metal part has good contact with the pipe surface. The sensor must be thermally insulated so that room temperature does not distort water temperature measurements.

Diagram Description (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 a return water temperature of at least 25°C must be ensured.
• Pipework package must include a circulation pump, which circulates heating/cooling medium through the coil (smaller circuit) and a 3-way mixing valve with a modulated actuator. If a 2-way valve is used, non-return valves must also be installed to ensure continuous circulation around the smaller circuit. PPU must be installed as close to the water coil as possible.
• Heat exchanger coils of DX coolers/heaters are factory-filled with nitrogen gas. Before connecting the heat exchanger coil to the refrigerant system, the nitrogen gas is discharged through a valve, which is then cut off, and coil connections are soldered to the pipeline.

3.6. Connection of Condensate Drain

In Domekt CF units with a counter-flow plate recuperator, condensate is formed due to the difference 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, water cannot drain out of the condensate collection tray by itself. Thus, it is necessary to connect a siphon or a siphon with a one-way valve to the drain pipe.

Diagram Description (Fig. 9a): Installation of a siphon without a one-way valve, showing pipe dimensions.

The drainage pipeline must be mounted with a slope, without constrictions or loops, which might prevent water from draining easily. If the drainage pipeline passes through 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 connected to the wastewater system 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 contact; do not connect the drain directly to a sewer pipe and do not immerse it into water. The condensate collection point should be easy to clean and disinfect.

Diagram Description (Fig. 9b): Condensate drain connection to sewer system, showing an incorrect connection marked with a red cross.

4. Electrical Installation

Electrical work may only be carried out by a qualified electrician in accordance with the instructions given in this manual and applicable legal and safety requirements. Before performing electrical component installation:

• ⚠️ Make sure the unit is unplugged from the mains.
• If the unit has been standing in an unheated room for a long time, ensure there is no condensation inside it and check that the connectors and electronic parts are not damaged by moisture.
• Check the insulation of the power cable or other cables for damage.
• Locate the electrical diagram of the unit according to the specific unit type.

4.1. Electrical Input Requirements

• The power supply rating for the unit is 230 V AC, 50 Hz.
• Connect the unit only to a suitable power socket with appropriate earthing and meeting electrical safety requirements.
• It is recommended to connect the AHU to the mains via a 16 A automatic circuit breaker with 30 mA current leakage protection (type B or B+).
• It is recommended that control cables be placed at least 20 cm from power cables to reduce the possibility of electrical interference.
• All external electrical elements must be connected strictly according to the electrical diagram of the unit.
• Do not disconnect connectors by pulling them on wires or cables.

4.2. Connecting Electrical Components

All internal and external unit elements are connected to the main controller board.

Diagram Description (Fig. 10): C8 controller main board. Shows the main control board with labeled connectors for local network/internet, control panel, internal components, power supply, and fuses for electric heaters and power supply. Includes QR code for the Komfovent Control app.

The controller board may be concealed under a protective cover that must be removed for access to the controller terminals. For the location of the automation box and controller board, see section 1.3. The terminals for external elements are numbered and used only for optional components; they may remain empty if no additional features are required.

Diagram Description (Fig. 11): Terminals for connecting external elements of the C8 board. A table lists terminal numbers (1-21) and their functions, such as Modbus RTU, sensor inputs (Air quality, Humidity, Temperature), actuator outputs (Water mixing valve, DX control), fire alarm, general inputs/outputs, and air damper actuators.

• Terminal numbering shown applies only to the C8 controller board. Check the board type on the sticker in the front of the controller (see Fig. 10) before connecting external elements.
• The total power of external elements using 24 V voltage may not exceed 30 W.
• RS485 (1-2): Can be connected to: Control panel (Fig. 14), Data cable for a building management system (Modbus RTU protocol), Fire dampers controller.
• B8 (3-5): For connection of air quality or humidity sensors for "Air quality" function. Sensor type and connection point must be specified in settings (see "Domekt User Guide").
• Outputs TG1 (6-8): Power supply and control signal for water mixing valve actuator of external heat exchanger or direct evaporation (DX) cooler/heater. Depending on the "External coil" type selected in settings, the valve actuator will be controlled by a heating or cooling signal. An external pre-heater for frost protection of CF heat exchangers can also be connected here.
• B1 (9-10): If additional duct-mounted heating/cooling devices are used, a duct supply air temperature sensor must be installed instead. The sensor must be installed downstream all heating/cooling units at a distance of at least two duct diameters from the nearest heat exchanger coil.
• Diagram Description (Fig. 12a): Duct mounted supply air temperature sensor.
• B5 (11-12): For duct-mounted water heater, a return water temperature sensor must be installed to protect against freezing (see section 3.5).
• Diagram Description (Fig. 12b): Water temperature sensor.
• Inputs (13-15): To switch between "Override" ventilation modes (see "Domekt User Guide"), connect the respective terminals together with the common terminal 13. Ventilation modes will operate until terminals are connected. To activate these modes, a switch, motion detector, or kitchen hood with normally open contacts (NO) can be connected to the terminals.

4.3. Control Panel Installation

The control panel must be installed in a room with:

• Ambient temperature: 0...40°C.
• Relative humidity: 20% to 80%.
• Protection against accidental water droplets.

The control panel can be mounted on a concealed mounting box or directly on the wall (screws are supplied). Magnets on the back allow attachment to metal surfaces (e.g., the unit door). If possible, mount the control panel in a place with good circulation of ventilated air. Do not install the control panel inside cabinets, behind doors, in a corner of a room, or in direct sunshine. This is very important when room temperature maintenance is used or in CF type AHUs, which use temperature and humidity sensors inside the control panel for operation.

• ⚠️ Do not use any other size or type of screws but those packed together for control panel mounting. Wrong screws may damage the panel's electronics board.

Diagram Description (Fig. 13): Example of "Override" ventilation mode activation when using additional air extraction with a motorised damper. Shows wiring from the C8 controller board to a switch and a damper actuator.

Fire alarm requires a normally closed contact (NC). A jumper is connected between terminals 13 and 14; the building fire system can be connected instead. When the contact is disconnected, the unit stops, and a fire alarm message is displayed.

• Outputs (16-18): Terminals used when external heating/cooling units require an additional closed/open contact (e.g., to start the DX unit). Corresponding contacts close depending on whether the AHU heats or cools.
• FG1 (19-21): Terminals used to connect air damper actuators. 230 V power supply actuators with or without a spring return can be connected.

4.4. Connecting the Unit to an Internal Computer Network or the Internet

The unit can be controlled not only by the control panel but also by computer or smartphone. In such cases, the air handling unit must be connected to a local computer network or the Internet. Control is via a web browser or the Komfovent Control app. The unit connects to the network with a CAT5 type cable (RJ45 connector; see Fig. 10). The total cable length between the unit and the network router must not exceed 100 m.

By default, the IP address of the air handling unit is 192.168.0.60, but it can be changed (if necessary) according to local network parameters. The IP address can be found and changed on the control panel (only on the C6.1 panel).

Diagram Description (Fig. 16): View and change the IP address of the AHU on the control panel. Shows screenshots of the control panel interface for network settings like IP address, subnet mask, and gateway.

An air handling unit connected to a network router can be controlled by a computer via a wireless connection (Wi-Fi) on the internal network. After connecting the unit to the network router, activate the DHCP setting on the panel (see Fig. 16). This automatically assigns the unit a free IP address on the local network (do not use this setting if connecting the computer directly to the unit).

When connecting the computer directly to the unit, in the computer's network settings, manually assign an IP address where the last number differs from the unit's IP address (e.g., if unit IP is 192.168.0.60, assign 192.168.0.70 to the computer). Also, enter the subnet mask: 255.255.0.0.

Diagram Description (Fig. 17): Computer network settings for direct connection to the unit. Shows a screenshot of Windows TCP/IPv4 properties for manual IP configuration.

To control the unit over the Internet, it must be connected to a network router with Internet access. Subsequent settings vary depending on whether the unit is controlled by a computer or a smartphone.

• The easiest way to manage your unit over the internet is to use a smartphone with the Komfovent Control app. Launch the app on your phone (the phone must have Internet access). When connecting for the first time, the app will ask you to scan the QR code on the front of the controller board (see Fig. 10). Scanning the code automatically establishes the connection to the unit (for more information on the Komfovent Control app, see "Domekt User Guide").
• More settings are needed to control your unit over the Internet using your computer. First, port forwarding must be configured to the unit's IP and port number 80, according to the network router's instructions. When connecting to the internet with a computer, you will need to enter an external router IP address and the port number in the Internet browser to point to the air handling unit's user interface (see "Domekt User Guide" for more information on computer control).

Diagram Description (Fig. 18): Examples of unit connection to a local network or the Internet. Illustrates network connectivity via a router and the Komfovent Control app.

5. Starting and Checking the Unit

Before turning on the unit, check for any foreign objects, garbage, or tools inside. Ensure air filters are installed, condensate drainage is connected (if required), and the siphon is filled with water. Inspect the duct system for obstructions such as fully closed diffusers or regulation dampers, and check that outdoor air grills are not blocked.

• ⚠️ The operation, maintenance, or repair of the air handling unit is prohibited for people (including children) with mental, physical, or sensory disabilities, as well as for persons without sufficient experience and knowledge, unless supervised and instructed by the person responsible for their safety in accordance with these instructions.
• The air handling unit can only be started when it is fully installed, with ducts and external electrical elements connected. Do not start the unit without the duct system, as this may distort the measurement of airflow required for stable fan control.
• ⚠️ Do not use the unit with a temporary electrical power supply, as unstable power can damage electronic components.

5.1. Control Panel C6.1

If the unit is connected to the mains, a home screen or screen saver will appear on the control panel. Touching the screen saver returns it to the home screen.

To turn on the air handling unit:

Screenshots show the process of turning the unit ON via the C6.1 control panel.

During the first minute after start-up, the unit's automation evaluates settings, checks components, and opens air dampers (if equipped with actuators). Fans then receive a signal, and the unit starts operating in the last used ventilation mode.

To change the ventilation mode:

Screenshots show navigating the C6.1 control panel to select different operation modes (AWAY, NORMAL, INTENSIVE, BOOST, KITCHEN, FIREPLACE, OVERRIDE, HOLIDAYS).

To turn off the air handling unit and return to the home screen:

Screenshots show the process of turning the unit OFF via the C6.1 control panel.

5.2. Control Panel C6.2

If the unit is connected to the mains and stopped, a red indicator next to the power button will light up.

To turn ON/OFF the AHU or select the operating mode:

Images show pressing buttons on the C6.2 control panel to select operating modes (AWAY, NORMAL, INTENSIVE, BOOST, ECO, AUTO) and turn the unit ON/OFF. A blue indicator light shows the active mode, and a red indicator shows when the unit is stopped.

5.3. Start-up of the Unit Using a Computer

If the unit was ordered without a control panel, it can be started using a computer. Control is via a web browser. Connect the computer directly to the air handling unit or to the computer network as described in section 4.4. Disable all proxy servers that may block the connection in Internet browser settings. Enter the unit's IP address in your web browser.

Screenshot shows entering the IP address (192.168.0.60) in a web browser.

Log in to the C8 controller user interface: enter the username "user", password "user", and press "Login".

Screenshots show the login interface for the C8 controller.

To start the unit, press the required ventilation mode button.

Screenshots show the computer interface for controlling operation modes and stopping the unit.

5.4. Quick Check

When you start your unit for the first time, check the following:

Unit installed by:

Company:
Phone:
Date:
Signature: