ATTACK Cassette Fan Coil Unit FCU - C 6 (9.0/5.8 kW, DC motor)
Code: FCUC6Product detailed description
ATTACK Cassette fan-coil unit FCU - C 6 (9.0/5.8 kW, DC motor) is a cassette (ceiling-recessed) fan-coil (fan convector) unit from the FCU - FCU - C 6 series, designed to distribute heat and cold from a heat pump (e.g. ATTACK Inverter R32 Air/Water) directly into residential or commercial spaces. The unit achieves a cooling output of approx. 9.0 kW and a heating output of approx. 5.8 kW, and is powered by a modern direct current (DC/EC) fan motor with smooth speed control.
Key features
- cassette (ceiling-recessed) installation - mounted into the ceiling, typically into a 600x600 mm module, with air distribution into the room via a four-way (or one-way) discharge grille and central intake - suitable especially for office, commercial and residential spaces with a suspended ceiling where a hidden, aesthetic installation is required
- Cooling output approx. 9.0 kW, heating output approx. 5.8 kW (at rated conditions)
- DC (EC) fan motor - low power consumption, quiet and smoothly adjustable operation
- Built-in condensate collection tray with drain connection for cooling mode
- Replaceable/washable air filter that captures dust and coarse impurities
- Rated air flow rate approx. 1300 m³/h at the highest fan speed
- Option of independent room control using a thermostat/controller and a motorised valve on the water supply
- Suitable as a terminal (distribution) element of a heating and cooling system with a heat pump
How a fan-coil unit works
A fan-coil (fan convector) is a water heat exchanger fitted with a fan that blows room air through a finned exchanger. In summer, chilled water from a heat pump operating in cooling mode flows through the exchanger, the air is cooled and dehumidified, and the unit returns it back into the room - the resulting condensate is drained through the collection tray and drain connection. In winter, warm heating water can instead flow through the exchanger, and the unit serves as a supplementary or main heat source for the room, with a faster response than, for example, underfloor heating.
Thanks to the DC (EC) motor, the fan speed can be smoothly adjusted to the current output requirement and to the demand for quiet operation (e.g. in night mode in a bedroom), while keeping the fan's own electricity consumption low.
Overview of the ATTACK FCU fan-coil unit range
The ATTACK FCU range offers cassette (ceiling-recessed) and wall-mounted versions in several output levels, so a suitable unit can be selected for rooms of various sizes. The ATTACK Cassette fan-coil unit FCU - C 6 (9.0/5.8 kW, DC motor) model is part of this range.
| FCU - C 2 / C 3 | cassette, smaller cooling output approx. 3.1 / 4.7 kW - smaller rooms |
| FCU - C 4 / C 5 / C 6 | cassette, medium cooling output approx. 5.9 - 9.0 kW - larger rooms, living rooms |
| FCU - C 8 | cassette, the highest cooling output in the range approx. 11.6 kW - large spaces, open-space offices |
| FCU - W 2 / W 3 | wall-mounted, smaller cooling output approx. 2.7 / 4.1 kW - bedrooms, smaller rooms |
| FCU - W 4 / W 5 | wall-mounted, higher cooling output approx. 5.4 / 6.8 kW - living rooms, larger rooms |
Choosing a suitable room and location
When selecting the location of a fan-coil unit, it is necessary to take into account the room's thermal load (floor area, window orientation, glazed areas, number of occupants), a clear air flow path without obstacles (furniture, curtains) and the availability of a water supply and electrical connection. For the cassette version, sufficient clear height above the ceiling must be provided for the unit body and service access, while for the wall-mounted version, placement in the upper third of the wall with a clear view into the room is recommended.
Installation and use
ATTACK Cassette fan-coil unit FCU - C 6 (9.0/5.8 kW, DC motor) connects to the heating/cooling water supply via a G 1/2" threaded connection; we recommend installing shut-off ball valves for servicing purposes and a motorised 2-way or 3-way valve to control the flow according to the room's current thermal load. Condensate drainage must be solved either by gravity flow into the sewer or using a condensate pump if a gravity gradient is not available. The unit's weight is approx. 32.5 kg, with approximate dimensions of 600x600x260 mm (cassette body) + approx. 850 mm of superstructure above the ceiling. Before first start-up, we recommend having the connection checked by a professionally qualified person.
Control and operation options
The unit can be complemented with a wired room controller with a display, a wireless remote control, or integrated into a higher-level building management system. Control generally allows setting the desired temperature, selecting the fan speed level, and switching between heating and cooling mode (for systems with 4-pipe or switchable 2-pipe distribution). The specific type of controller and its functions should be selected according to the heating/cooling system design.
Energy efficiency and operating costs
Thanks to the DC (EC) fan motor, the electricity consumption of the ATTACK Cassette fan-coil unit FCU - C 6 (9.0/5.8 kW, DC motor) itself is significantly lower than with older AC motor types, especially at partial output. Since a fan-coil unit only distributes heat/cold produced by the heat pump and does not generate heat itself, its operating costs consist mainly of the fan's consumption - the actual energy consumption for heating/cooling depends primarily on the efficiency of the connected heat pump.
Practical usage examples
Summer cooling of the living room: The ATTACK Cassette fan-coil unit FCU - C 6 (9.0/5.8 kW, DC motor) connected to an ATTACK Inverter R32 heat pump operating in cooling mode can significantly improve thermal comfort in a room during hot summer months, where underfloor heating alone provides no or only limited cooling effect.
Quick temperature boost in transitional seasons: In spring and autumn, when outdoor temperatures fluctuate, a fan-coil unit provides a faster response to changes in the desired temperature than the more sluggish underfloor heating, which is especially appreciated in rooms with variable occupancy (living room, home office).
Compatibility with ATTACK heat pumps
The ATTACK Cassette fan-coil unit FCU - C 6 (9.0/5.8 kW, DC motor) is designed to work with ATTACK Inverter R32 Air/Water heat pumps, which can supply both chilled and warm heating water needed for the unit's cooling and heating modes. When more fan-coil units are installed in a building, we recommend connecting them via a hydraulic manifold or a buffer/balancing tank (e.g. ATTACK AK ANTIKOR), which stabilises the flow and protects the heat pump against unwanted compressor cycling when several circuits open/close simultaneously.
Air quality and filtration
Intake air passes through a replaceable/washable filter before reaching the exchanger, which captures coarser dust and particles, protecting the finned exchanger from clogging and extending the interval between deep cleanings of the unit. When operating in cooling mode, the room air is also partially dehumidified, which in the summer months contributes to a better sense of thermal comfort even at the same air temperature. For increased air quality requirements (allergy sufferers, dustier environments), a finer supplementary filter can also be considered if the given model and controller allow it.
Safety and installation notes
The electrical connection of the unit (fan, and if applicable the condensate pump) must be carried out by a professionally qualified person in accordance with applicable electrotechnical standards. Condensate drainage must be routed with a gradient away from living spaces, or via a functional condensate pump, to prevent water leaking into the building structure. Before first start-up, we recommend performing a pressure test of the water circuit.
Ecological and sustainability aspect
Thanks to the DC (EC) fan motor, the ATTACK Cassette fan-coil unit FCU - C 6 (9.0/5.8 kW, DC motor) consumes less electricity than comparable versions with an older AC motor, especially when operating at partial output. Since the unit only distributes heat/cold and does not generate it (this is done by the connected heat pump), its ecological benefit lies primarily in the efficient use of already produced energy without unnecessary losses.
Delivery and handling
The product is delivered by pallet freight, typically within a few business days of ordering (we will confirm the exact delivery date after receiving your order, as some models are manufactured or assembled to order). Given the product's weight (approx. 32.5 kg), we recommend having suitable handling equipment available when receiving the shipment (pallet truck, or a second person), and checking the packaging for damage upon receipt in order to preserve any claim for transport damage.
About the manufacturer ATTACK
ATTACK, s.r.o. is a Slovak manufacturer of heating and cooling technology, which complements its portfolio of ATTACK Inverter R32 heat pumps with related accessories including FCU fan-coil units, buffer tanks and DHW cylinders, in order to offer customers a complete heating and cooling solution from a single source.
Technical parameters
| Installation type | cassette (ceiling-recessed) |
| Model | FCU - C 6 |
| Cooling output (estimate) | 9.0 kW |
| Heating output (estimate) | 5.8 kW |
| Fan motor type | DC (EC) - direct current, smooth control |
| Rated air flow rate | approx. 1300 m³/h |
| Installation method | cassette (ceiling-recessed) |
| Dimensions (estimate) | 600x600x260 mm (cassette body) + approx. 850 mm superstructure above the ceiling |
| Weight (estimate) | 32.5 kg |
| Water connection | G 1/2" |
| Condensate drainage | collection tray + drain connection (condensate pump optional) |
| Manufacturer | ATTACK, s.r.o. |
| Country of origin | Slovakia |
| Warranty | 24 months |
Note: dimensions, weight and air flow rate are approximate estimates for this FCU model; please verify the exact values in the manufacturer's current technical data sheet or request them when ordering.
Frequently asked questions
How does a fan-coil unit work in combination with a heat pump?
A fan-coil unit is a water heat exchanger with a fan that takes cold or warm water from a heat pump (e.g. ATTACK Inverter R32) and delivers it to the space through intensive air flow - it cools in summer and can provide supplementary heating in winter. It is therefore a terminal (distribution) element of the heating/cooling system, not a standalone heat source.
Does condensate form during cooling, and how is it drained?
Yes, during cooling mode, moisture from the air condenses on the cooling exchanger. The unit is equipped with a condensate collection tray with a drain connection, which is connected to drainage by gravity or via a condensate pump if a gravity gradient is not available.
Why does the unit have a DC (EC) motor, and what are the benefits?
Compared to a conventional AC motor, a direct current (DC/EC) fan motor offers smooth speed control, significantly lower electricity consumption and quieter operation, which is a significant advantage for year-round fan-coil operation in residential spaces.
What is the difference between the cassette and wall-mounted versions?
The cassette (C) version is mounted into the ceiling (usually a 600x600 mm module) and distributes air into the room via 4-way (or 1-way) grilles, which is suitable for larger rooms and where a hidden installation is required. The wall-mounted (W) version is mounted on the wall similar to a classic split air-conditioning unit and is simpler to install and to maintain the filter.
Can a single fan-coil unit be controlled independently from the rest of the heating system?
Yes, the units are typically fitted with their own room thermostat/controller (wired or wireless) and a motorised 2-way or 3-way valve on the water supply, so the temperature in a given room can be controlled independently of other circuits.
Is a buffer or balancing tank required before the fan-coil units?
Connection via a hydraulic manifold/balancing (buffer) tank is recommended, for example from the ATTACK AK ANTIKOR range, which stabilises the flow and temperature of the water supplied to the individual fan-coil units and protects the heat pump compressor against frequent switching.
How noisy is the unit, and can it be adjusted?
Thanks to the DC motor, several fan speed levels can be smoothly set - at the lowest level, operation is very quiet, suitable for example for a bedroom, while at the highest level the maximum declared cooling/heating output is achieved.
Can the unit be connected to a central control system (BMS) or an app?
Yes, most fan-coil unit controllers support connection to a bus (e.g. Modbus) or integration into a higher-level building management system (BMS), or via a gateway to a mobile app. The specific options depend on the type of controller chosen, which must be purchased separately according to the project design.
How often does the filter need to be cleaned or replaced?
We recommend checking and cleaning (or replacing) the air filter at least twice a year, more often when operating in dustier environments. A clogged filter reduces the unit's air flow rate and can increase its noise level.
Can a fan-coil unit fully replace radiators, or does it only supplement heating?
In practice, fan-coil units are used in both ways - as a supplementary quick source of heat/cold alongside underfloor heating (especially for summer cooling, which underfloor heating alone does not provide), or as the main heating and cooling element in a room. The choice depends on the overall design of the building's heating/cooling system.
Warranty and service
This ATTACK brand product is covered by a standard warranty period of 24 months from commissioning, but no more than 30 months from the date of dispatch from production. For selected products, and when commissioning is registered by an authorised service technician, an extended warranty can also be arranged - please check the specific conditions when ordering or with our sales department. Service and spare parts are provided by the network of authorised ATTACK service partners in Slovakia, and spare parts are normally kept in stock.
Before commissioning, we recommend having the connection and system filling checked by a professionally qualified person (heating engineer/service technician), in order to meet the conditions for the full warranty period.
Summary
ATTACK Cassette fan-coil unit FCU - C 6 (9.0/5.8 kW, DC motor) - a cassette (ceiling-recessed) fan-coil unit with a DC motor, cooling output approx. 9.0 kW and heating output approx. 5.8 kW, designed to distribute heat and cold from the ATTACK Inverter R32 heat pump into residential and commercial spaces.
Additional parameters
| Category: | ATTACK buffer tanks and fan coils |
|---|---|
| Warranty: | 2 years |
| Weight: | 32.5 kg |
| Model: | FCU - C 6 |
| Fan motor type: | DC (EC) |
| Water connection: | G 1/2" |
| Control: | room thermostat / controller (separate) |
| Manufacturer: | ATTACK, s.r.o. |
| Country of origin: | Slovakia |
| Warranty: | 24 months |
| Installation type: | cassette (ceiling-recessed) |
| Cooling capacity (estimated): | 9.0 kW |
| Heating capacity (estimated): | 5.8 kW |
| Rated air flow: | approx. 1300 m³/h |
| Dimensions (estimated): | 600x600x260 mm (cassette) + approx. 850 mm above-ceiling extension |
| Weight (estimated): | 32.5 kg |
| Condensate drain: | collection tray + drain outlet |
Product rating
Be the first who will post an article to this item!
Discussion
List of discussions
Rastislav
ATRIA.SK
About the company
The product ATTACK is manufactured using the most modern production technologies available to us. As the most significant Slovak manufacturer of heating technology with purely Slovak capital and a single owner, we fully understand that each production process is reflected in the lifespan of this product and, of course, in your satisfaction. Therefore, we use only the best – from special boiler sheet metal through precise laser cutting of materials, to the most important – waterproof welds, which we perform exclusively robotically in precise fixtures, thus eliminating the human factor. All ATTACK products are high-quality premium products made using the most modern technology based on the latest research. The products have quality certificates from renowned testing laboratories and meet the conditions for the allocation of state subsidies.
History of the company ATTACK
The production site of the company is located in the northern part of central Slovakia, about 20 km from the city of Žilina. Our company, which is engaged in the production of heating technology, started production in 1995 with stationary boilers and gradually expanded its production to today's level, where it produces a wide range of wall-mounted condensing boilers, stationary boilers, solid fuel boilers and TÚV tanks. The company ranks among medium-sized companies covering an area of approximately 5000 m2 covered area and about 1000 m2 uncovered area. Boiler production takes place in our own production halls and has its own development, design, sales and export to foreign markets.
Company profile and vision
“The main goal and philosophy of the company is to develop top products with the highest quality, functionality and design, which achieve the highest combustion efficiency with regard to the environment while maintaining a favorable price.“
The company ATTACK and product portfolio
We offer a wide selection of products that differ by type of fuel and power. All boilers are equipped with components from world manufacturers produced by the most modern technology, production controlled by camera and computer systems and tested by the most progressive devices and methods. In each group there is a wide range of choices both in modifications and in power. Boilers are mainly intended for heating of family houses, apartments and also larger businesses. The company profile includes a portfolio containing boilers for biomass, gas, electricity and accessories. In the production of boilers we use renewable energy source and that is photovoltaic panels with a power of 200kWp, which provide sufficient electrical energy for production.
Export and service
The company ATTACK exports its products to more than 51 countries around the world. Currently we export our products to all EU countries, Russia, USA, Canada and New Zealand. The biggest interest abroad is in modern wood gasifying and pellet and combined boilers, which are currently very popular in Europe and on the American continent as well as in stationary gas boilers, which reliably represent us even in distant Siberia.
A special approach to each customer, accommodating negotiations and reliability quickly grow into mutual trust, which ensures us a constant growth of customers in other countries.
Our service partners are trained in our own training center, which is equipped with products involved in real operation. Our partners are trained in two phases – theoretical and practical – where they have the opportunity to apply the theoretical part into practice and try everything on the products.The company ATTACK, s.r.o. covers the service network throughout the territory of Slovakia. In case of a breakdown, we can help you with up to 705 service organizations, whose professionally trained service technicians can quickly resolve any problem with an ATTACK product for heating of family houses, apartments or businesses.
Company profile – Research and development
The company ATTACK, s.r.o. has its own research and development center, where development and technical staff of the company annually innovate and prepare new heating technology devices. Emphasis is placed on the simplicity of device operation, modern design, environmental tolerance and minimal dimensions. All products are designed and developed in accordance with the relevant standards, specifications, legal and other regulations. The selection of components for ATTACK products is subject to the strictest criteria and only reliable and long-term operation verified components and materials from renowned suppliers can be used.
In development, ATTACK, s.r.o. does not cooperate with other manufacturers, but strives to always be one step ahead of the competition.
The company ATTACK – Certificates and awards
The company ATTACK, s.r.o. is the holder of the quality certificate ISO 9001:
- for the design and development of boilers,
- for the production of boilers,
- service of devices and boilers
We place high emphasis on the quality of our products. We are the holders of the quality management certificate ISO 9001 since 2003. This quality certificate of international directive certifies activities in research and development, production, design and operation of gas equipment. The approval certificate was approved and issued by the prestigious London-based auditing company Lloyd’s Register Quality Assurance.
The demanding requirements placed on the company are also evidenced by the need to defend the certificate from the certification company LRQA every 3 years.
This quality management system indicates the progressiveness and positive approach of the company ATTACK, s.r.o. to the customer, to whom it proves its quality of a purely Slovak traditional company. The management system also emphasizes the company's strategy, which leads to its compliance, further development and improvement. All ATTACK® products are high-quality premium products made using the most modern technology based on the latest research. The products have CE, TÜV, GOST certificates from renowned testing laboratories around the world.
We regularly participate in domestic and foreign exhibitions of heating technology, where the company has received a whole range of awards from honorable mentions to gold medals.