Split System – viessmann

Split heat pumps Vitocal 222-A type MB

Topics at a glance

Location and functions
Advantages
Product range

Sound and space requirements play a significant role when it comes to air-source heat pumps. Split heat pumps are among the heating systems that not only consider both factors but also optimally implement them.

Design and operating principle of a split heat pump

A split heat pump consists of an indoor and outdoor unit, with all components that could cause noise located in the outdoor unit. These include the fan, evaporator, and compressor.

Consequently, the indoor unit is compact and can be installed very flexibly. Only the condenser, circulation pump, and control and safety equipment are housed indoors. It is also extremely quiet, thanks not only to its split design but also to the coordinated components and carefully thought-out, noise-optimized construction.

The heat generation process can be repeated as desired.

During operation, a fan installed in the outdoor unit actively draws in outside air and directs it to the evaporator (heat exchanger). The refrigerant circulates within the evaporator, heating up at a low temperature. After the refrigerant changes its physical state, it enters the electrically driven compressor as warm vapor. It compresses the vapor, thereby increasing its temperature to the required level.

The hot vapor is then transferred through thin refrigerant pipes to the condenser, which is located in the indoor unit. There, the hot vapor transfers its thermal energy to the heating system and gradually cools. Because the vapor is still under high pressure, it must first pass through an expansion valve, which restores its original state. Once this stage is complete, the process can begin again.

Split system heat pump diagram

Split heat pumps are characterized by division into a quiet indoor unit and an outdoor unit for air treatment.

Heat from the air

[1] Vitocal split air/water heat pump, indoor unit
[2] Vitocal split air/water heat pump, outdoor unit
[3] DHW cylinder

Advantages of a split heat pump

The main advantage of the Viessmann split-system heat pump is its barely audible operation. The unit is designed and manufactured in such a way that deep noises perceived as interference are shifted to a higher frequency. Furthermore, all Viessmann split-system heat pumps feature a night mode, which further reduces sound levels. Use in areas with particularly strict noise emission regulations, such as terraced houses or resorts, poses no harm.

Cooling and heating possible

In addition to their modest footprint and quiet operation, split-system heat pumps are designed for reversible operation. This allows them to cool rooms to the required level during hot summer months using convectors or surface cooling systems. They also feature a modular design, allowing for system expansion. System owners can remain highly flexible and install additional heat pumps if their heating or cooling needs increase. Other advantages of split-system heat pumps include:

Low operating costs thanks to high efficiency at all operating points.
Easy-to-use Vitotronic control unit with text and graphic display
Ready to connect to a solar system
High ease of use thanks to remote control via the ViCare app and smartphone/tablet
High subsidy amounts are available

As heating-only systems or systems providing heating and cooling, these Viessmann air-source split systems are ideal for new construction and retrofits. This design eliminates the need for expensive wall outlets or ductwork.

However, installation of both units in a closed refrigeration circuit can only be performed by a certified refrigeration specialist. Furthermore, the system user must have the refrigerant circuit in large systems inspected for leaks annually by a refrigeration specialist.

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Range of split systems with heat pumps

As heating-only systems or systems providing heating and cooling, these units are ideal for new construction and retrofits. This design eliminates the need for expensive wall outlets or ductwork.