Heos sistema

The new frontier for refrigeration system design

Be part of the revolution with DC inverter technology



HEOS Sistema has won the 2016 AHR Expo Innovation Award in the Refrigeration Category.

The 2016 AHR Expo Innovation Awards recognizes the most creative, effective, and ingenious HVACR products and technologies on the market. Winners are chosen by a panel of third-party ASHRAE member judges in each of 10 product categories based on innovation, value, and impact on the marketplace. 


Heos System is the new concept offered by CAREL for commercial refrigeration.


A new way of developing refrigeration systems that comprises plug-in cabinets featuring simple on-board refrigeration units with DC inverter compressors. The heat of condensation is carried outside of the store via a simple water loop, which is in turn is cooled by an outdoor dry cooler.


This new type of refrigeration system stands out for three simple reasons:


heos 80%

  • No long copper pipes;

  • No comp rack and receivers;

  • 1-2kg refrigerant charge for cabinets


heos 96%

  • From «multiplexed systems» 10-15% to «integral cabinets» 1-2%;

  • No welding on the field;

  • Factory tested units.

heos 25%

  • High efficiency DC compressors;

  • Individual evap. temperature;

  • Fully controlled performances


The fundamental concepts of this system are:



1. Flexibility

This is an increasing need for all supermarket chains, mainly as a consequence of growth in the convenience store segment, which requires flexible installation, and the possibility to change and redesign spaces and maximise display area.

  • No more need of compressor rack: Wider sales area;
  • Easy installation or deinstallation of new/promotional cabinets: Flexible sales area;
  • Possibility to easly move cabinets inside the supermarket: Easy layout change;
  • Critical components fully contained into the cabinet: High investment recovery in case in case of store relocation.

2. Energy efficiency

Primarily due to the use of DC inverter compressors, specifically designed to maximise efficiency when operating at part loads and with a wide range of speed modulation, when coupled with electronic expansion valves the energy efficiency of a Heos system is further enhanced thanks to complete control of the various units, maximising performance through the use of advanced algorithms.

  • higher efficiency at part load;
  • wide modulation range: from 15 to 90 rps;
  • optimum food temperature control;
  • full control of refrigeration unit, safe envelope management;
  • COP calculation, predictive algorithms and real defrost on demand.

heso graph

DC vs. ON/OFF compressors

The wide range of speed modulation and intrinsic efficiency of DC compressors mean they can guarantee, compared to traditional on/off units:

  • Energy saving of up to 25%;
  • Lower noise and smaller dimensions;
  • Greater reliability due to less on/off cycles;
  • More stable control.



3. Environmentally friendly

The drastic reduction in total refrigerant charge and leaks from the water loop system significantly reduce the direct TEWI effect of the system.

TEWI: Total Equivalent Warming Impact


TEWI graph

4. Easy installation and maintenance

The possibility to use plug-in units, assembled and tested directly in the factory, combined with the simplicity of developing a water loop system, mean considerable cuts in installation and maintenance costs.
Complete control of the refrigeration units also allows the application of innovative preventive diagnostic systems, for better management and planning of maintenance operations before any of the units actually shut down .

easy installation

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