Vaillant aroVAIR VA 1-WC WK - wired room controller for fan coils

Product detailed description

Vaillant aroVAIR VA 1-WC WK is an original wired (cabled) wall-mounted controller designed to operate fan coil units of the Vaillant aroVAIR pro series, primarily wall-mounted units of the VA 3-WN type. It represents an alternative to the wireless remote control supplied as standard, for situations where it is more convenient to have the controls permanently mounted on the room wall - typically in shared spaces, rented rooms, offices, or simply wherever the user does not want to deal with a lost or discharged portable remote. The controller communicates with the fan coil unit via a cable connection and offers the same range of functions as the remote control, if not a wider one, including the option to use the controller's own temperature sensor instead of the internal sensor in the fan coil.

Technical parameters and functions of the VA 1-WC WK

Why choose a wired controller instead of a remote control

The wireless remote control that comes as a standard part of the aroVAIR pro fan coil unit package is practical for everyday home use - it can be carried around the flat, placed on a table or a nightstand. In some situations, however, it is more advantageous to have the controls permanently fixed to the wall: for example in meeting rooms, waiting rooms, shared corridors of apartment buildings, offices with multiple employees, or in rented rooms and apartments where a portable remote is easily lost, damaged, or runs out of batteries exactly when it is needed. The wired controller VA 1-WC WK solves these problems - it is firmly attached to the wall, has no batteries of its own (it is powered from the controlled unit or the mains via the installation cable), and its position on the wall also allows more accurate temperature measurement directly in the occupied part of the room, where people actually spend their time, instead of measuring at the air intake of the fan coil, which can be affected by the proximity of the wall, a window, or airflow from another part of the room.

Operating modes and controls

The VA 1-WC WK controller offers the same operating modes you will find on the fan coil unit's wireless remote control: the automatic Auto mode (the electronics itself evaluates whether heating, cooling, or just ventilation is needed), Heating, Cooling, Dry (dehumidification without significant cooling) and a separate Fan mode (air circulation without active heating or cooling, useful for example for mixing the air in the room). It also includes the SWING function, which controls the automatic tilting of the fan coil's air outlet louvre so that the airflow is evenly distributed across the room instead of being directed at a single spot. The fan coil's fan can be set to three fixed speed levels (MIN, MED, MAX) or left on automatic (AUTO), which smoothly adjusts the speed to the current deviation from the set temperature.

The time programme allows you to set different required temperatures and operating states for different parts of the day and days of the week - for example a lower temperature during the night or during absence on working days, and a comfortable temperature in the morning and evening. The keypad lock function (child lock) prevents unintentional or unwanted changes to the settings, which you will especially appreciate in more publicly accessible spaces or in households with small children.

Temperature sensing choice - internal sensor vs. controller

One of the key functions of this controller is the ability to switch the source of room temperature measurement from the internal probe in the fan coil unit to the probe built directly into the controller's body on the wall. Fan coil units are often mounted high on the wall or near a window, where the local air temperature can be slightly different from the average temperature in the occupied part of the room (for example due to a draught from the window, or conversely due to heat rising to the ceiling). Placing the controller at a normal height on the wall in the occupied part of the room (typically approx. 1.2-1.5 m above the floor) gives a more accurate picture of the actually perceived temperature, and therefore more precise comfort control without unnecessary overheating or overcooling.

Installation

The VA 1-WC WK controller is mounted on the room wall similarly to a classic room thermostat - the connecting cable leads to the controlled fan coil unit (VA 3-WN or another compatible aroVAIR unit). The recommended mounting height is approximately 1.2-1.5 m above the floor, away from direct sunlight, direct airflow from the fan coil, and away from heat sources such as electrical appliances or lighting, which could distort the temperature measurement. Cable routing is best planned already during the shell construction stage or during electrical wiring renovation, or run in a surface trunking for additional installation. We recommend verifying the exact wiring diagram and compatibility with the specific fan coil model in the installation manual or with an authorised Vaillant installation company.

Compatibility

The controller is primarily intended for the range of wall-mounted fan coils Vaillant aroVAIR pro VA 3-WN (models VA 3-025 WN, VA 3-035 WN, VA 3-045 WN), which are also part of our e-shop's offering. When combining it with other aroVAIR models (console CSN, cassette KN), we recommend verifying the compatibility of the specific controller version with the given unit before ordering, since different fan coil series may use different communication interfaces or connectors.

When it makes sense to combine it with the wireless remote control

In some installations it is worth keeping the original wireless remote control alongside the wired controller - for example in a household where the permanently mounted controller is meant to serve as the main, "permanent" control for everyday settings, while the wireless remote remains at hand for quick, occasional adjustments (for example a short-term increase in cooling when guests visit). Both devices can control the same unit, the fan coil's control electronics generally accepts commands from both sources, with the last entered command taking priority.

Maintenance

The VA 1-WC WK controller requires no special maintenance - it is only recommended to occasionally wipe the display and buttons with a slightly damp cloth without aggressive cleaning agents, which could damage the surface finish or the button labels. Since the controller has no batteries of its own (it is powered from the controlled unit), there is also no need to worry about battery replacement, which you may know from classic room thermostats or remote controls.

Frequently asked questions

Summary - why choose the VA 1-WC WK

The Vaillant aroVAIR VA 1-WC WK is a practical addition for anyone who wants to have permanent control of a fan coil unit available on the room wall, with more accurate temperature measurement and without the risk of losing or discharging a portable remote control. It offers the full range of operating modes, the SWING function, three fan speeds and a keypad lock, meeting the requirements even of more demanding or more publicly accessible installations.

Typical deployment scenarios

Rented flats and apartments: for both short-term and long-term rentals it is more practical to have the fan coil control permanently fixed to the wall than to rely on the tenant or guest finding and using the portable remote control correctly - this also reduces the risk of losing the remote when tenants change.

Office and shared spaces: in open-plan offices, meeting rooms or reception areas it is convenient to have a central, clearly visible and permanently placed control accessible to authorised persons, with the option to lock the keypad for other employees.

Households with children: the keypad lock function prevents children from changing the temperature or mode settings, while parents retain full control over the room's comfort.

Rooms without good wireless signal reach: in some cases (for example thick masonry walls, metal structures) a wireless remote control may have limited range or signal reliability to the unit - the controller's wired connection eliminates this problem entirely, since communication takes place over a physical cable.

Comparison with smart thermostats

There are also numerous universal smart thermostats with a mobile app on the market, but these are generally designed primarily for boilers or heat pumps with simple on/off heating control, not for multi-mode fan coil units with functions such as SWING, selection of three fan speeds, or switching between heating/cooling/dry/fan. The original VA 1-WC WK controller, on the other hand, is designed directly by the fan coil manufacturer so as to fully utilise all the unit's functions without the compromises or limited compatibility that can accompany universal third-party solutions. At the same time, installing original accessories does not affect the fan coil's warranty, which may not always be guaranteed with non-original or universal control elements.

Energy savings thanks to proper control

Precise and conveniently accessible control of the fan coil has a direct impact on operating costs - when the controller is easily reachable on the wall and its time programme is well set (for example lowering the temperature during absence at work and raising it just before returning home), occupants less often leave the unit running unnecessarily at a higher output than is currently needed. More accurate temperature measurement directly in the occupied zone of the room (instead of the fan coil's internal probe) also reduces the risk of unnecessary overheating or overcooling caused by distorted measurement, which over the course of the heating and cooling season translates into lower energy consumption of the heat pump.

We therefore recommend, when designing a new heating and cooling system with fan coils, considering from the outset which rooms will have a wired controller and which will manage with the supplied wireless remote control - this decision also affects the need to route cabling during shell construction or renovation, when additional cable installation is substantially easier and cheaper than after the interior is finished.