Vaillant aroVAIR pro VA 2-050 KN – cassette fancoil 5 kW

Product detailed description

Vaillant aroVAIR pro VA 2-050 KN – a cassette fancoil unit for both heating and cooling

The Vaillant aroVAIR pro VA 2-050 KN is a cassette (ceiling-mounted, false-ceiling installation) fancoil unit from the mid power class of the aroVAIR KN range, designed for quiet and fast distribution of heat in winter and cold in summer in a single room or a medium-sized open space. The unit works on the principle of a water heat exchanger – hot or cold water from an external source (most often a Vaillant aroTHERM plus air-to-water heat pump, or flexoTHERM, or a Vaillant ecoTEC condensing gas boiler combined with a cooling unit) flows through a finned heat exchanger inside the fancoil, and a fan pushes room air through this exchanger. The air is thus either heated or cooled and dehumidified, and is evenly distributed into the room through four outlet openings of the cover panel (the panel is ordered separately, see code 8000018476 for the 5 and 10 kW version). This principle – no refrigerant in the living space, only water in a closed loop – makes aroVAIR fancoils a safe, quiet and low-maintenance solution for combined air conditioning and heating in a single device.

The VA 2-050 KN model belongs to the mid power range with a rated cooling capacity of 5.86 kW at high fan speed (dropping to 4.55 kW at low speed) and a heating capacity of up to 6.78 kW at high speed (5.39 kW at low speed). This capacity is sufficient for comfortable temperature control of residential and office spaces with a typical heat loss of approximately 45–65 m² of floor area at a standard ceiling height, depending on the room's orientation, the building envelope's heat losses, and the number of external walls and windows. The unit is structurally based on an 840 × 840 mm (footprint) platform, with a body height of 288 mm, which also allows installation in false ceilings with limited structural height.

How a cassette fancoil works in a heat pump system

Fancoil units in the aroVAIR range are designed as hydronic (water-based) terminal units of a heating and cooling system. Unlike conventional split-unit air conditioning, where refrigerant circulates directly between the outdoor and indoor units, the VA 2-050 KN fancoil uses a single medium – water (or a water-antifreeze mixture in cooling mode during winter operation) – which is prepared centrally by one heat/cold source and distributed to all fancoils in the building via pipework. This has several major advantages: firstly, refrigerant is never handled indoors, which eliminates risks associated with refrigerant leaks and simplifies legal requirements for servicing (F-gas certification is not required for the fancoils themselves). Secondly, a single heat/cold source (for example, one Vaillant aroTHERM plus air-to-water heat pump) can simultaneously supply multiple rooms via several fancoils of different power classes – combining wall-mounted (WN), slim console (CSN), low wall/console (CN) and cassette (KN) units in a single building, according to the layout of each room. Thirdly, cassette installation in a false ceiling means the unit is visible from the living space only as a low-profile design panel with grilles, which is an architecturally more discreet solution than a wall-mounted or console unit.

In heating mode, the VA 2-050 KN works as a classic hot-water fancoil – the fan blows air through the exchanger heated by return water from the heat pump or boiler, thus supplementing or completely replacing conventional radiator heating with a fast convective heat component. The advantage of fancoil heating over underfloor heating is a much faster response – the room heats up within minutes, not hours, which is particularly practical during the transitional spring and autumn periods or in spaces with intermittent use (meeting rooms, cottages, apartments). In cooling mode, chilled water (typically 7 °C at the inlet) flows through the exchanger, and the fan, while cooling the air, also dehumidifies it, as air moisture condenses on the cold surface of the exchanger fins. The condensate is drained by gravity via a connected drain hose into a collecting tray (see accessories below) and then into the sewage system.

Technical parameters of the Vaillant aroVAIR VA 2-050 KN

Installation and setup

The VA 2-050 KN is installed in a false ceiling using suspension rods anchored into the ceiling structure, with the minimum clearance required for service access and maintenance (a recommended false-ceiling access opening of approximately 950 × 950 mm, matching the size of the cover panel). Before installing the unit body, the water supply and return pipework must be prepared (insulated, to prevent moisture condensation on the pipes during cooling mode), as well as a condensate drain pipe sloping toward a drain or a condensate pump, and a 230 V power supply cable. After the unit body has been suspended and levelled horizontally (important for correct condensate drainage from the collecting tray), the water pipework is connected, tightness is tested, and finally the design cover panel is fitted, which conceals the technical components and unifies the outlet grilles with the aesthetics of the false ceiling. We recommend having the installation carried out by a qualified heating/cooling technician, who will also connect the unit to the control system (a room controller or a central building management system) and set the hydraulic balancing of the circuit relative to other fancoils in the system.

An important step during design is the correct sizing of the circulation pump and pipework, taking into account the pressure drop of the exchanger at the rated flow rate, so that the fancoil receives a sufficient amount of water at the design temperature differentials. In systems with multiple fancoils (for example, a combination of wall-mounted WN and cassette KN units), hydraulic balancing using balancing valves or differential pressure controllers is recommended, so that each unit receives its designed flow rate regardless of whether all branches are operating simultaneously or only part of them.

Compatibility with heat and cold sources

The VA 2-050 KN fancoil is designed as a universal hydronic terminal unit that works with any hot/cold water source within the temperature range typical for low-temperature heating/cooling systems. In practice, it is most often combined with Vaillant aroTHERM and aroTHERM plus air-to-water heat pumps (units capable of both heating and active cooling simultaneously), with a flexoTHERM (ground-to-water) heat pump, or in combination with a Vaillant ecoTEC condensing gas boiler for the heating function, supplemented by a separate cold source for summer operation. Operating modes (Auto / Heating / Drying / Cooling / Fan) and fan speed are controlled by a compatible wired or wireless controller – for this power class (5 and 10 kW), we recommend the VA 2-AWC DK controller (code 8000022076), which offers a time program, a SWING function for even air flow distribution, three fan speed levels (MIN/MED/MAX) with an AUTO mode option, switching of room temperature sensing directly from the controller, and a keypad lock against unauthorised manipulation.

Maintenance and care

Regular maintenance of the VA 2-050 KN fancoil mainly consists of regularly cleaning or replacing the air filter (usually located behind the intake grille of the cover panel), which captures dust and allergens from the circulating air – inspection is recommended at least once every 1–2 months during the season of intensive operation, as a clogged filter reduces performance and increases fan power consumption. It is also necessary to regularly check the patency of the condensate drain and the cleanliness of the collecting tray, especially before the start of the cooling season, to prevent condensate overflow into the false ceiling. The exchanger should undergo professional inspection/cleaning of its fins as part of the regular servicing of the heating/cooling system (an annual service inspection is recommended together with the heat pump or boiler), during which the tightness of the water connections, the functionality of the centrifugal fan, and the controller settings are also checked. During long-term shutdown (for example, out of season), it is recommended to leave the system under pressure (do not drain the water circuit) to prevent corrosion of the internal parts of the exchanger, and in case of a risk of frost (unoccupied buildings in winter), ensure the medium contains an adequate proportion of antifreeze mixture.

Why choose the VA 2-050 KN model

The VA 2-050 KN is a balanced choice for medium-sized rooms and open spaces, where a lower-power wall-mounted fancoil (WN range) is no longer sufficient, but the full 10 kW VA 2-100 KN model would be oversized for the given area and unnecessarily costly to purchase and operate. Thanks to cassette installation in the false ceiling, the unit takes up no wall or windowsill space and blends aesthetically with the interior of an apartment, office, showroom or reception area, while retaining the full capacity of a two-pipe system capable of both heating and cooling. Combined with a Vaillant aroTHERM plus heat pump, you thus get one integrated system covering heating, cooling and partial air dehumidification without the need for a separate air-conditioning unit with a refrigerant circuit indoors.