Danfoss Drives in HVAC

Proven leader in HVAC

AC drives are installed on a daily basis in various heating, ventilation and air conditioning (HVAC) and water-boosting applications in new and existing buildings and infrastructural systems all over the world. They enhance air quality and indoor comfort levels, improve control and energy-saving possibilities, ensure better asset protection, reduce maintenance costs and increase reliability.

 
The daily load variation in HVAC facilities is considerable. Variable speed control of electrical motors has proved to be one of the most effective cost-reducing measures available. By reducing the average speed of a motor in, for example, a pump or fan by 20%, energy savings of 50% can be achieved. Reducing the average speed by 50% increases the savings to 80%.

Reduce total cost of ownership

Lifetime energy costs have a major impact on total cost of ownership. Even small reductions in energy use can provide vast cost savings over a relatively short timeframe. Seen over its lifetime, the initial cost of an AC drive only amounts to 10% of the total cost of ownership; the remaining 90% covers energy consumption, service and maintenance.

Features, such as Automatic Motor Adaptation and Automatic Energy Optimization, ensure that your drive is always perfectly adapted to the attached motor and changing loads. And, with minimal maintenance requirements, Danfoss AC drives provide a fast return on your HVAC investment and significantly reduce your total cost of ownership. 
Calculate energy consumption with VLT® Energy Box
 
VLT® Energy Box software calculates, as accurately as possible, the cost, savings and payback time of using Danfoss AC drives in HVAC fan and pump applications. The tool allows you to compare the energy consumption of HVAC fans and pumps driven by Danfoss drives with alternative methods of flow control.

Applications

HVAC systems regulate the heating and cooling units in a building to provide the highest levels of comfort. The conditions are controlled by several applications which all use AC drives. Here are some of the main HVAC-related applications:

Heating

  • Boiler forced and induced draft fans
  • Primary hot water pumps
  • Fan coils
  • Heat recovery systems

Ventilation

  • Air handling units, rooftop units, supply and extract fans
  • Variable/constant air volume ventilation systems
  • Smoke ventilation, fire control and stairway ventilation systems
  • Car park ventilation systems
  • Kitchen ventilation systems

Cooling

  • Chilled water pumping systems
  • Primary/secondary pumps
  • Variable flow with primary pumps only
  • Fan coils
  • Heat recovery systems
  • Cooling tower fans, Condenser water pumps
  • Chiller compressor

Fresh water

  • Booster pumps
  • Single or parallel pumps

Safety and compliance: Fire and smoke safety

All buildings with requirements for ‘life safety’ on essential service applications require firemode functionality. The fire mode functionality in the VLT® HVAC Drive FC 102 provides reliable and continuous operation of applications related to stairwell pressurization, smoke extraction, lift shaft pressurization and car park ventilation for safer and more effective emergency evacuation. Fire override mode protects the drive in the event of a fire, ensuring vital fan operation regardless of high temperatures, control signals, warnings and alarms.

Seismic compliance 

Seismic compliance is essential for all drives running ‘life safety’ applications. The VLT HVAC Drive complies with Importance Factor 1.5. This compliance is tested in accordance with the standard ICC-ES AC-156 by the Californian Office of Statewide Health Planning and Development (OSHPD).

Electromagnetic compatibility (EMC) compliance

Danfoss provides AC drives with optimum EMC protection and integrated harmonic filters to ensure the ideal EMC environment, and cleanest power supplies are maintained throughout the operational lifetime of the system. With first-class EMC compliance, they fulfill the most stringent emission requirements:

IEC 61800-3:2004 Category C1/EN55011 Class B (residential) with 50-meter screened motor cable
IEC 61800-3:2004 Category C2 & C3/ EN55011 Class A Group 1 & Group 2 with 150-meter screened motor cable

Get more information

  • VLT® HVAC Basic Drive FC 101

    Optimized for basic operation of pumps and fans, the VLT® HVAC Basic Drive is supplied with built-in functions that reduce initial costs and increase productivity.

  • Enhanced VLT® HVAC Drive FC 102
    VLT® HVAC Drive FC 102

    This tough and savvy FC102 drive enhances pump and fan applications in building management systems, and runs outdoors in most climates.

  • VLT® Refrigeration Drive FC 103
    VLT® Refrigeration Drive FC 103

    FC103 is dedicated to controlling compressors, pumps and fans for significant energy savings in refrigeration plants.

  • VLT® Micro Drive FC 51
    VLT® Micro Drive FC 51

    The smallest drives in the FC51 series are ideal for side-by-side mounting with a high integration density.

  • VACON® 20
    VACON® 20

    Compact, but packed with programming functionality that’s ideal for OEM applications.