ATTACK Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW)

Product detailed description

The ATTACK Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW) is a wall-mounted fan-coil (fan convector) unit from the FCU - FCU - W 2 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 capacity of approx. 2.7 kW and a heating capacity of approx. 1.8 kW, and is powered by a modern direct-current (DC/EC) fan motor with continuously variable speed control.

Key features

• wall-mounted installation - mounted directly on the wall similar to a classic wall (split) air-conditioning unit, air is drawn in from the front/top and blown into the room through adjustable louvres - suitable where no false ceiling is available or where simpler installation and filter maintenance is required
• Cooling capacity approx. 2.7 kW, heating capacity approx. 1.8 kW (at nominal conditions)
• DC (EC) fan motor - low electricity consumption, quiet and smoothly adjustable operation
• Built-in condensate collection tray with drain connector for cooling mode
• Replaceable/washable air filter capturing dust and coarse impurities
• Nominal air flow of approx. 500 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 both the 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 air from the room through a finned coil. In summer, chilled water from a heat pump operating in cooling mode flows through the coil, the air is cooled and dehumidified, and the unit returns it to the room - the resulting condensate is drained via the collection tray and drain connector. In winter, warm heating water can flow through the coil instead, and the unit serves as an additional 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 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 both cassette (ceiling-mounted) and wall-mounted versions in several capacity levels, allowing selection of a suitable unit for rooms of different sizes. The model ATTACK Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW) is part of this range.

Choosing a suitable room and location

When choosing the location of a fan-coil unit, it is necessary to consider the room's heat load (area, window orientation, glazed areas, number of people), an unobstructed air flow path (furniture, curtains) and the availability of water and electricity connections. With the cassette version, sufficient clear height above the false ceiling must be allowed for the unit body itself and for service access; with the wall-mounted version, it is advisable to place it in the upper third of the wall with a clear view into the room.

Installation and use

The ATTACK Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW) connects to the heating/cooling water piping 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 regulate flow according to the room's current heat load. Condensate drainage must be resolved either by gravity fall into the sewer system or using a condensate pump if a gravity fall is not available. The unit weighs approx. 12.5 kg, with approximate dimensions of 900x195x600 mm (W×D×H, estimated). Before first start-up, we recommend having the connection checked by a professionally qualified person.

Control and operating options

The unit can be complemented with a wired room controller with a display, a wireless remote controller, or integrated into a higher-level building management system. Control typically allows setting the desired temperature, selecting the fan speed level, and switching between heating and cooling mode (in systems with 4-pipe or switched 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 Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW) itself is significantly lower than with older types with an AC motor, especially at partial output. Since the fan-coil unit only distributes heat/cold produced by the heat pump and does not generate heat itself, its operating costs mainly consist of the fan's consumption - the actual energy consumption for heating/cooling depends primarily on the efficiency of the connected heat pump.

Practical examples of use

Summer cooling of the living room: The ATTACK Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW) connected to an ATTACK Inverter R32 heat pump operating in cooling mode can significantly improve thermal comfort during hot summer months in a room where underfloor heating alone provides no cooling effect, or only to a limited extent.

Fast top-up heating in transitional periods: In spring and autumn, when outdoor temperatures fluctuate, a fan-coil unit provides a faster response to a change in desired temperature than the more inert underfloor heating, which is especially appreciated in rooms with variable occupancy (living room, home office).

Compatibility with ATTACK heat pumps

The ATTACK Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW) is designed to work with heat pumps from the ATTACK Inverter R32 Air/Water range, which can supply both chilled and hot heating water needed for the unit's cooling and heating modes. If several 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 from unwanted compressor cycling when several circuits are opened/closed at the same time.

Air quality and filtration

Before contact with the heat exchanger, the intake air passes through a replaceable/washable filter that captures coarser dust and impurities, protecting the finned coil from fouling and extending the interval between thorough cleanings of the unit. When operating in cooling mode, the unit also partially dehumidifies the room air, which in 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, or condensate pump if used) must be carried out by a professionally qualified person in accordance with applicable electrotechnical standards. Condensate drainage must be routed with a fall away from living spaces or via a functioning 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 Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW) 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 provided by the connected heat pump), its ecological benefit lies primarily in the efficient use of already generated energy without unnecessary losses.

Delivery and handling

The product is delivered by pallet freight, usually within a few working 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. 12.5 kg), we recommend arranging suitable handling equipment (pallet truck, or a second person) when receiving the shipment, 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 ATTACK Inverter R32 heat pump portfolio with related accessories, including fan-coil units from the FCU range, buffer tanks and domestic hot water cylinders, in order to offer customers a complete heating and cooling solution from a single source.

Technical parameters

Note: dimensions, weight and air flow are approximate estimates for this model in the FCU range; please verify 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 hot water from a heat pump (e.g. ATTACK Inverter R32) and transfers it into the space through intensive air flow - cooling in summer, and possibly adding 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 coil. The unit is equipped with a condensate collection tray with a drain connector, which is connected to the drain either by gravity or via a condensate pump if a gravity fall is not available.

Why does the unit have a DC (EC) motor, and what is the benefit?

Compared to a classic 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 installed in a false 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 concealed 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 easier to maintain the filter.

Can a single fan-coil unit be controlled independently from the rest of the heating system?

Yes, 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 tank or balancing tank needed 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 water supplied to the individual fan-coil units and protects the heat pump compressor from frequent switching.

How noisy is the unit, and can it be controlled?

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 capacity 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 system (e.g. Modbus) or integration into a higher-level building management system (BMS), or via a gateway to a mobile app. Specific options depend on the chosen controller type, which needs to be purchased separately according to the project.

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, and more often when operating in a dustier environment. A clogged filter reduces the unit's air flow and may 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 both ways - as an additional fast-response heat/cold source 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 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 the factory. 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 usually 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 full warranty coverage.

Summary

ATTACK Wall-mounted fan-coil unit FCU - W 2 (2.7/1.8 kW) - a wall-mounted fan-coil unit with a DC motor, cooling capacity approx. 2.7 kW and heating capacity approx. 1.8 kW, designed to distribute heat and cold from the ATTACK Inverter R32 heat pump into residential and commercial spaces.