Vaillant climaVAIR multi VAM1-120A5NO - multisplit outdoor unit 12.0 kW

Product detailed description

Vaillant climaVAIR multi VAM1-120A5NO - outdoor unit of a multi-split air conditioning system

VAM1-120A5NO is a standalone outdoor (compressor) unit from the climaVAIR multi series by the German manufacturer Vaillant, designed for building a multi-split air conditioning system with your own choice of number and capacity of indoor units. The designation A5 in the unit code means that up to 5 independently controlled indoor units can be connected to it - each room can have its own thermostat, its own mode (cooling/heating/dehumidification/ventilation) and its own time program, while sharing one common outdoor heat exchanger placed on the facade, on the ground, or on the roof of the building.

This unit is sold separately - it is intended for installation companies and investors who assemble a custom air conditioning system from individual components (instead of buying a pre-configured package/set), or who need to replace the outdoor unit of an existing climaVAIR multi multi-split system. Indoor units, refrigerant piping and other accessories need to be purchased separately according to the specific configuration.

Technical parameters of VAM1-120A5NO

Note: dimensions and weight are approximate for some size classes (the manufacturer slightly adjusts them between production revisions) - binding dimensions for a specific unit can be found on the unit's rating plate or in the current Vaillant technical data sheet.

How a multi-split system with the VAM1-120A5NO unit works

Unlike a simple mono-split system (1 outdoor + 1 indoor unit), the multi-split outdoor unit VAM1-120A5NO allows up to 5 indoor units to be connected simultaneously via separate refrigerant circuits routed from branching fittings (so-called Y-branches or a distribution box), which are part of the installation material, not the outdoor unit itself. Each indoor unit has its own expansion valve, so the capacity delivered to individual rooms is regulated independently - if the bedroom is set to a lower temperature than the living room, the compressor of the outdoor unit adjusts its speed (inverter control) to cover the sum of the current demands of all connected indoor units at once, up to the limit of 5× indoor units simultaneously, up to approx. 15.2 kW of cooling combined - the largest configuration in the climaVAIR multi range.

The advantage of this arrangement is a single outdoor unit instead of 5 separate ones - less space needed on the facade or on the ground, a single electrical connection point for the compressor, and a more aesthetic exterior of the building. The disadvantage compared to separate mono-split units is that the sum of the currently requested outputs of all indoor units must not exceed the maximum output of the outdoor unit - so if all rooms request full output at the same time during extreme heat, the system will distribute the available capacity proportionally among them.

Typical use

The VAM1-120A5NO unit is most often used for air conditioning an entire floor of a house or a smaller facility with 5 separate zones, where the investor wants a separate indoor unit with its own control in each room, but does not want multiple outdoor units on the facade or around the house. It is suitable both for houses and for smaller facilities, medical practices, offices, or apartments where zonal temperature control is required.

When choosing indoor units for this outdoor unit, we recommend taking into account that the sum of the nominal outputs of all connected indoor units may slightly exceed the nominal output of the outdoor unit (a common practice with multi-split systems, so-called reasonable "oversizing"), since it is unlikely that all rooms would request maximum output at exactly the same time. We recommend consulting the exact combination with an installation company or directly with Vaillant technical support.

Compatible indoor units

The VAM1-120A5NO unit can be connected to wall-mounted indoor units from the climaVAIR pro VAIB1 series (power classes 020, 025, 035, 050 and 065, i.e. 2.0 to 7.0 kW), or other types of indoor units from Vaillant's multi-split system range (cassette, ducted, floor-standing - depending on the manufacturer's current offer and R32 refrigerant compatibility). We recommend verifying the exact combinability of individual types and the maximum number of units per port in the current Vaillant combination table before ordering a complete set.

Installation and assembly

Installing the VAM1-120A5NO outdoor unit requires a solid and level surface (wall brackets, or concrete pads when placed on the ground/roof), sufficient free space around the unit for air intake and discharge (min. clearances according to the manufacturer's installation manual) and access for servicing. Connection to the indoor units is made using insulated copper refrigerant piping (see separate refrigerant pipe products 1/4" and 1/2" in this category) and a communication/power cable.

After connecting the piping, a pressure test with nitrogen follows, then evacuation of the circuit to remove air and moisture, and only afterwards opening of the service valves and starting up the system. This part of the installation, as well as any topping up of R32 refrigerant for longer pipe runs above the standard length, may only be carried out by a company authorized to work with F-gases - this is a legal requirement, not just a manufacturer's recommendation.

The electrical connection of the VAM1-120A5NO outdoor unit is single-phase (230 V/50 Hz); the connection should be sized according to the nominal current of the unit and the recommendations of the electrical installation designer - maximum current 15.1 A in cooling mode and 14.2 A in heating mode - top model of the range, requiring a dedicated circuit breaker.

Operation, control and smart functions

The VAM1-120A5NO outdoor unit operates with continuous inverter control of compressor speed, thanks to which the system adapts to the current heat load instead of switching on and off abruptly (which is typical of older on/off air conditioners). This results in quieter operation, more even room temperature and lower electricity consumption compared to comparably powerful on/off units. Control is carried out at the level of individual indoor units (remote control, or an app with a Wi-Fi module for compatible indoor units) - the outdoor unit itself has no user controls of its own.

The unit supports operation at low outdoor temperatures thanks to compressor protection and evaporator defrosting functions, so it can also be used as a supplementary heat source (air-to-air heat pump) outside the main heating season, when it is not economical to run a central boiler or a water heat pump.

Frequently asked questions

How many indoor units can I connect to the VAM1-120A5NO?

Up to 5 independently controlled indoor units, each with its own control and independent temperature setting.

Can I combine indoor units of different capacities on one outdoor unit?

Yes, this is the typical way of using a multi-split system - you choose a lower capacity for a smaller room (e.g. VAIB1-020WNI) and a higher capacity for a larger one (e.g. VAIB1-050WNI), together within the outdoor unit's limit.

Can the unit also heat, or only cool?

Yes, it is a bidirectional air-to-air heat pump - it can both cool and heat depending on the mode selected on the indoor unit.

What refrigerant does the unit use?

R32, a modern refrigerant with a lower global warming potential (GWP) compared to older types such as R410A.

Is professional installation required?

Yes, connecting the refrigerant circuit, evacuation and starting up the system may only be carried out by a company authorized to work with refrigerants (F-gases).

What if I don't connect all ports of the outdoor unit?

Unused ports must be professionally closed/capped according to the installation manual; the system also works with fewer indoor units connected than the maximum.

Maintenance and service

The outdoor unit requires minimal regular maintenance - it is recommended to check the permeability of the heat exchanger once or twice a year (remove dirt, leaves, pollen caught on the fins), check the unit's fastening and the condition of electrical connections, and once every 1-2 years have the tightness of the refrigerant circuit and system pressure professionally checked. Regular servicing extends compressor life and maintains the declared output and energy efficiency.

Why choose the VAM1-120A5NO

The VAM1-120A5NO outdoor unit combines proven technology from the German manufacturer Vaillant (known primarily for heating technology) with the flexibility of a multi-split solution - the investor is not bound to a predefined set, but can tailor the system exactly to the number and size of rooms, or gradually expand it with additional indoor units up to the limit of 5 units. Selling individual components also allows for easy replacement of the outdoor unit during servicing without the need to replace functioning indoor units.

Energy efficiency and operating costs

The inverter-controlled compressor of the VAM1-120A5NO outdoor unit modulates output continuously instead of switching abruptly to full power, which, at partial load (i.e. most of the operating time except the hottest days), results in significantly lower electricity consumption than a comparably powerful on/off air conditioner. As a rough guide, for seasonal cooling of a household with a system connected to the VAM1-120A5NO unit, under typical Slovak climate conditions, one can expect an annual consumption of roughly several hundred kWh for cooling (the exact value depends on the number of operating hours, temperature difference and set temperature) - for example, a rough estimate of approx. 4200 kWh per season at medium usage intensity, which is only an illustrative calculation, not a value guaranteed by the manufacturer.

Actual consumption depends primarily on the combined load of all connected indoor units, the quality of the building's insulation, the set target temperature and the length of the operating season. When used for both summer cooling and supplementary heating in spring/autumn, the investment in the VAM1-120A5NO unit usually pays back faster, as it also partially replaces heating from more expensive sources during transitional periods.

Legislative context - working with R32 refrigerant

R32 refrigerant belongs to the group of fluorinated greenhouse gases (F-gases), which are subject to the EU F-gas regulation. Any intervention in the refrigerant circuit of the VAM1-120A5NO unit - connecting piping, evacuation, topping up or removing refrigerant, as well as service repairs - may only be carried out by a person and company with a valid certificate of professional competence for working with F-gases. For systems with a larger refrigerant charge, there may also be a legal obligation for regular leak checks of the circuit at specified intervals - the specific obligation and interval will be determined by the installation company based on the actual amount of refrigerant in the filled system.

Delivery and packaging

Due to the weight (approx. 92 kg) and dimensions of the unit, this product is considered oversized and fragile goods - it is delivered by courier on pallets or in reinforced cardboard packaging, and is not intended for delivery to parcel lockers/pickup boxes. When accepting the goods, we recommend checking the integrity of the packaging and, in the case of visible damage, drawing up a report with the shipping company directly upon receipt.

Warranty

The VAM1-120A5NO outdoor unit is covered by the standard 2-year warranty from the manufacturer Vaillant from the date of sale to the end customer, provided that professional installation and commissioning is carried out by a company with the appropriate authorization (installation by a layperson or an unauthorized company may be grounds for the manufacturer to reject a potential warranty claim). We recommend keeping the proof of purchase as well as the installation/commissioning report from the installation company.

Related products for this outdoor unit

For a complete installation of the VAM1-120A5NO unit, you will likely need: the appropriate number of climaVAIR pro VAIB1 indoor units (available in this category in power classes from 2.0 to 7.0 kW), insulated refrigerant piping of suitable diameters (1/4" and 1/2" - both available in this category), a mounting bracket for the outdoor unit, and connecting/fastening material. We recommend having the exact scope of required material specified by an installation company based on an on-site inspection.

Extended frequently asked questions

What does the designation A5 in the unit code mean?

The letter A with a number in the middle of the code (e.g. A5) indicates the number of ports, i.e. the maximum number of indoor units that can be independently connected to this particular outdoor unit.

Can I add another indoor unit later if I initially use fewer ports?

Yes, if you do not use all the ports during the initial installation, the piping to the free port can be routed later and an additional indoor unit added, of course again only through a company authorized to work with refrigerants.

Is the noise level of the VAM1-120A5NO outdoor unit suitable for densely populated areas?

The sound power level of approx. 62-68 dB(A) is comparable to common air conditioning units of this power class - when placing it on a facade, we recommend choosing a location that takes into account neighboring living spaces and local regulations on nighttime noise limits.

Do I need a building permit to install the outdoor unit?

Installing an air conditioning unit on the facade of a house usually does not require a building permit, but in some cases (e.g. on apartment buildings, in heritage-protected zones) it may require notification or approval from the homeowners' association/building authority - we recommend checking local requirements before installation.