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          HVAC control

          Regulate temperature by maintaining air pressure


          Main drivers

          “It is difficult to make heating and air conditioning systems more energy efficient without affecting occupant comfort. The fact that HVAC systems are often set up by floor further complicates the situation. I need a flexible solution that can adapt to fluctuating occupancy while using only the amount of energy that is actually needed.”

          Solution in brief

          Use variable speed drives to regulate air pressure and temperature


          Solution applicable to all buildings.


          Take a chilled-beam heating system, for example. The most energy-efficient solution for this type of  heating system would be to add temperature regulation functions via a thermostat, plus pressure regulation in the beam and the room.

          The thermostat (T) (see diagram opposite) controls air flow by adjusting the shutters on the intake vent (1). The pressure in the heated beam (2) and the room (3) are kept at constant levels by varying fan speed. The two ATV21 variable speed drives feature an integrated proportional regulation function that allows them to control the fans directly based on information from the pressure sensors (P).

          The solution optimizes regulation regardless of fluctuating occupancy patterns. To fine tune energy consumption even further using presence detectors, automatic blind controllers, and timers, a building management system would be required. In this type of setup, the variable speed drives and sensors would be connected to the BMS via a communication bus.

          Benefits for end users

          > Save up to 20% off your energy costs by using independent variable speed drives
          > Minimize maintenance and filter clogging
          > Quieter operation
          > Use up to 50% less energy by integrating variable speed drives into your building management system (BMS)
          > Regulate temperature within a limited range
          > Provide constant ventilation
          > Add presence detectors and automation systems to further optimize the system

          Benefits for professionals

          + Design
          • Eliminates direct starts, so motor size can be decreased
          • Simplifies electrical architecture as all functions are integrated into the variable speed drive
          • Eliminates the need for additional anti-harmonics filters
          • Includes integrated communication bus
          + Installation
          • Products are compact in size
          • Optional features can be added without increasing product size
          • Simple user interface
          + Maintenance
          • Local or remote troubleshooting
          • Smoother starting increases the lifespan of mechanical components and reduces frequency of maintenance



          To know more

          To know more 

          Additional support

          Contact Schneider Electric
          For additional help or to contact us, visit customer services