Vaillant aroVAIR VA 2-045 CN – console fan coil 4.3 kW (cooling/heating)

Product detailed description

Vaillant aroVAIR VA 2-045 CN (order number 0010035093) is the second most powerful console fan coil in the aroVAIR VA 2 CN range, with a cooling and heating capacity of 4.30 kW at the highest fan speed. The casing has the same outer dimensions as the smaller VA 2-035 CN model, but the internal heat exchanger and hydraulic parameters are dimensioned for higher output – ideal for spaces where you want to keep the compact silhouette of the unit but need noticeably more cooling and heating capacity than the mid-range model in the series.

How the VA 2-045 CN fan coil works

This is a two-pipe fan coil unit supplied with water from an air-to-water heat pump (typically the Vaillant aroTHERM) or another suitable heat/cold source – without its own compressor and without a refrigerant circuit. Water flows through a three-row copper heat exchanger with aluminium fins, and a pair of direct-current (DC/EC) fans distribute it along the whole length of the casing so that the airflow into the room is even. Thanks to the two-pipe design, the same circuit works alternately as a heating circuit (in winter, with hot water) and as a cooling circuit (in summer, with cold water) – which mode is currently active is controlled either directly by the heat source or by a supplementary set with a 3-way switchover valve fitted on the hydraulic branch to the unit.

Technical parameters of the VA 2-045 CN

The data is taken from the official Vaillant technical data sheet for the aroVAIR VA 2 CN range, measured according to EN 1397 under standardised test conditions (cooling: water 7 °C/12 °C inlet/outlet, air 27 °C dry bulb/19 °C wet bulb; heating: water 45 °C at ΔT 5 K, air 20 °C).

• Cooling capacity (total): 2.71 kW (low) / 3.48 kW (medium) / 4.30 kW (high)
• Sensible / latent cooling capacity (high speed): 3.25 kW sensible / 1.05 kW latent
• Heating capacity (total): 2.60 kW / 3.43 kW / 4.30 kW
• Water flow rate – cooling: 620 l/h / 730 l/h / 770 l/h
• Water flow rate – heating: 680 l/h / 810 l/h / 850 l/h
• Pressure drop – cooling: 22.78 kPa / 36.22 kPa / 54.2 kPa
• Pressure drop – heating: 22.32 kPa / 36.87 kPa / 54.3 kPa
• Air flow rate: 410 m³/h (low) / 580 m³/h (medium) / 790 m³/h (high)
• Fan power input: 14 W / 25 W / 50 W
• Rated current: 0.49 A
• Sound pressure level: 30 dB(A) / 38 dB(A) / 46 dB(A)
• Sound power level: 43 dB(A) / 52 dB(A) / 59 dB(A)
• Power supply: 220–240 V, 1 phase, 50 Hz
• Fan type and number: direct-current (DC) motor, rotary, forward-curved blades – 2 pcs
• Heat exchanger: 3 tube rows, tube diameter 7.94 mm, max. operating pressure 1.6 MPa
• Hydraulic connection inlet/outlet: G 3/4"
• Outer diameter of condensate outlet: 18.5 mm
• Dimensions (W × H × D): 1240 × 495 × 200 mm
• Net weight: 25.5 kg
• Installation type: console (parapet), optionally also ceiling-mounted
• Room temperature operating range: 17–30 °C, both cooling and heating

Which rooms the VA 2-045 CN is suitable for

Higher output compared with the VA 2-035 CN model (same casing size, but a more powerful heat exchanger) makes the VA 2-045 CN suitable for larger living rooms, open-plan kitchen-living areas, rooms with large glazed areas facing south or west (higher heat load in summer), or rooms with an increased heat loss in winter (high ceilings, corner rooms with several external walls). As an approximate guide, this covers spaces from about 30 to 45 m², always depending on the specific thermal calculation of the building.

The increased fan power input at the highest speed (50 W compared with 26 W for the VA 2-035 CN) and the higher sound power level (59 dB(A) compared with 52 dB(A)) are the price paid for higher output – however, during normal operation at low and medium speeds the unit is just as quiet as the smaller model, and high speed is only used briefly for rapid cooling or heating of the room.

Installation and hydraulic connection

Installation is identical to the other models in the range – console (parapet) installation under a window, free-standing on VAZ-015-070-F1 legs, or ceiling-mounted if the layout requires it. Given the higher pressure drop on the water side (up to 54.3 kPa at high speed in heating mode), when designing the hydraulic circuit it is necessary to allow for sufficient head from the circulation pump, especially if several fan coils are connected to a single circuit at the same time.

The hydraulic connection on the supply and return is again G3/4" with recommended shut-off valves for future servicing. The condensate drain (18.5 mm outer diameter) must be sloped towards the sewer or a collecting tank – with the higher cooling output and therefore higher moisture condensation, checking that the drain is clear before the summer season is even more important than with the smaller models in the series. The 230 V electrical connection requires a separate protected circuit, and control is provided by a room controller connected to the unit's terminal block.

Accessories for the VA 2-045 CN

• VA 1-WC DC – an analogue dial controller with Heating/Cooling/OFF modes and 3 fan steps, simple operation without electronics.
• VA 2-WC C – an electronic controller with 7 fan steps, finer gradation of fan output than the analogue variant.
• VA 2-WC D – a digital controller with display and automatic Auto/Heating/Dry/Cooling/Fan mode.
• Set with 3-way switchover valve (for the 1.5–4.5 kW output range) – also compatible with this model in a two-pipe connection.
• VAZ-015-070-F1 legs – for free-standing (floor) installation instead of wall or ceiling mounting.

Maintenance and service recommendations

• Air filter – given the higher air flow rate (up to 790 m³/h), we recommend checking and cleaning the filter at least twice a year, and monthly in dustier environments.
• Condensate system – regularly check that the drain is clear, especially before summer operation, when the unit produces a larger amount of condensate at high output.
• Bleeding the circuit – air in the system is felt more noticeably at higher output, both as reduced output and as flow noise, so thoroughly bleed the circuit after every intervention in the piping.
• Checking joint tightness – with higher pressure drops and flow rates, we recommend a visual check of the hydraulic connections and seals once a year.
• Fan service – the direct-current (DC) motors are maintenance-free; address any unusual noise or vibration through authorised service.

The whole aroVAIR VA 2 CN range at a glance

The VA 2-045 CN is the third output level out of four in the Vaillant aroVAIR VA 2 CN range of console fan coils, which share a common design concept – two-pipe connection, three-row copper heat exchanger with aluminium fins, direct-current (DC) fan with three speed steps, and the same G3/4" hydraulic connection:

• VA 2-015 CN – 1.50/1.57 kW, 1 fan, 790 × 495 × 200 mm, 18 kg – small rooms up to approx. 15–18 m².
• VA 2-035 CN – 3.50/3.50 kW, 2 fans, 1240 × 495 × 200 mm, 25.5 kg – a typical living room, 25–35 m².
• VA 2-045 CN (this product) – 4.30/4.30 kW, 2 fans, 1240 × 495 × 200 mm, 25.5 kg – a larger living room or a space with an increased heat load, 30–45 m².
• VA 2-070/075 CN – 7.35/8.05 kW, 3 fans, 1360 × 591 × 200 mm, 32.5 kg – large open-plan spaces or commercial applications.

When choosing between the VA 2-035 CN and the VA 2-045 CN, it is worth having a simple thermal calculation of the room prepared (heat loss in winter, heat load in summer) – since both units have identical space requirements for installation, the additional investment in the more powerful model in borderline cases is generally worthwhile, so that the unit does not have to run permanently at the highest (and therefore noisiest) speed.

Pipework, insulation and energy efficiency

The higher flow parameters of the VA 2-045 CN model (up to 850 l/h in heating at the highest speed) place increased demands on sizing the circulation pump and the diameter of the pipe distribution compared with smaller models in the series – when designing several fan coils on a shared heat pump circuit, it is therefore advisable to have the sum of flow rates and pressure drops verified with a system designer, so that the source can supply sufficient output to all units simultaneously.

As with other models in the series, high-quality thermal insulation of all pipework routed in cooling mode is essential – closed-cell insulation (e.g. synthetic rubber) prevents condensation of air moisture on the pipe surface outside the unit and protects building structures from moisture. In terms of operating costs, the fan coil remains more economical than a stand-alone split air conditioner – the unit's own power consumption (14 to 50 W depending on the selected fan speed) represents only a fraction of the energy needed to produce cold or heat, which is provided by the heat pump running in the house regardless of the connected fan coil.

Electrical safety and connection

Electrical installation work on the VA 2-045 CN unit and on the connected room controller may only be carried out by qualified electricians with the appropriate authorisation, in accordance with the applicable standards and regulations of the given country. Before any intervention, the unit must be disconnected from the mains on all poles using a suitable isolating device (e.g. a circuit breaker or fuse) with a minimum contact gap of 3 mm, and it must be ensured that it cannot be unintentionally switched back on during the work. The 230 V/50 Hz power supply itself should preferably be run as a separate circuit with its own residual current device, separate from other appliances in the household.

When transporting and handling the unit (weight 25.5 kg), we recommend working in pairs, especially when mounting it on a wall or ceiling, to avoid injury or the unit falling. When removing the unit's casing (for example to replace the filter or service the heat exchanger), proceed carefully – sharp edges of the frame can cause cuts, so protective gloves are recommended.

Why choose the VA 2-045 CN

If you need a more powerful solution than the mid-range VA 2-035 CN model, but do not want to change the footprint requirements for installation (the same 1240 × 495 × 200 mm casing), the VA 2-045 CN is the logical step up within the same range. It is a proven Vaillant technical platform compatible with all controllers and accessories of the entire VA 2 CN series, which simplifies both system design and future servicing. The same outer dimensions as the VA 2-035 CN model also allow an easy future exchange of the unit for a more powerful or weaker model without having to alter the building recess or the parapet, should the heating or cooling requirements of the room change over time (for example after facade insulation or window replacement). This flexibility is especially valuable in new builds finished in stages, where the actual thermal balance of a room is sometimes only refined after all construction work and furnishing has been completed.

Frequently asked questions