Danfoss Drives in HVAC

Keep your essential HVAC systems up and running

Keep your essential HVAC systems up and running

We are operating in a time of extremes. Whether your facility is ramping up operations to keep up with increased demand, or unexpectedly empty due to a shift to remote working conditions or closures, Danfoss can help you keep your HVAC systems running efficiently so you can focus on business. Our trained experts are here to assess the lifecycle of your equipment, and provide a tailored solution to maximize uptime, efficiency, and savings.

Proven leader in HVAC for VFD

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%.

Maximize uptime with Condition Based Monitoring

Maximize uptime with Condition Based Monitoring

See how you can turn the frequency drive you already have into the smartest sensor in your system. A sensor that enables predictive and condition-based monitoring (CBM) capabilities, processes data on the edge, and sends data wherever it’s needed. Explore how intelligent drives solve potentially critical problems in HVAC applications.

  • 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.

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.


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:


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


  • 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


  • 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

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Success stories

  • if (isSmallPicture) { Enercare Centre } else if (isBigColumns) { Enercare Centre } else { Enercare Centre }
    Convention Center Exhibits Major Pump Energy Savings

    Danfoss Drives VFD retrofit project helped the one million square foot Enercare Centre in Toronto, Canada save energy with dramatically improved pump motor efficiency, cut electricity costs, and helped achieve the center's sustainability goals.

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    Healthcare Data Center Takes Control of Uptime and Energy with Danfoss VLT® Drives

    The data center industry has standards to define the level of uptime required for a given class of application and the infrastructure needed to maintain that level. The standard being applied to medical data centers — known as the Uptime Institute’s Tier III standard — calls for 99.982 percent uptime, which translates to no more than 1.6 hours of downtime per year. This standard requires an uninterruptible power supply (UPS) system that can handle a power outage of at least 72 hours, and Danfoss was selected to help meet this standard.

  • if (isSmallPicture) { Las Vegas City Center } else if (isBigColumns) { Las Vegas City Center } else { Las Vegas City Center }
    Reliability and Consistency Make Danfoss VFD's a Sure Bet in Las Vegas

    For the mechanical systems that manage the indoor environment in this desert city, consistency and simplicity are desirable traits. Owners of casino hotels and restaurants that operate around-the-clock require HVAC equipment that is reliable and easy to operate and maintain.

  • U.S. Steel Tower Saves $1.1M with VLT® Retrofit

    After several retrofit projects, the U.S. Steel Tower has installed more than 150 Danfoss VLT® Drives, which are producing more than $1.1 million in documented energy savings and helping to give the building a greener reputation.

  • if (isSmallPicture) { Danfoss and Inertech change future of data center cooling } else if (isBigColumns) { Danfoss and Inertech change future of data center cooling } else { Danfoss and Inertech change future of data center cooling }
    Danfoss and Inertech change future of data center cooling

    New solution enables expansion without compromising security, consumes less energy and water, and costs less than traditional chiller plant.

  • if (isSmallPicture) { World’s greenest hotel uses 60% less electricity } else if (isBigColumns) { World’s greenest hotel uses 60% less electricity } else { World’s greenest hotel uses 60% less electricity }
    World’s greenest hotel uses 60% less electricity

    VLT® HVAC Drive helps Crowne Plaza Copenhagen Towers hotel optimize energy efficiency and cost effectiveness.