Acs Smart Buildings

What a Variable Frequency Drive Can Do For Your Energy Savings!

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When it comes to energy savings, one of the best tools out there for heating and cooling units is the installation of a variable frequency drive.

What is a variable frequency drive?

A variable frequency drive (VFD) is a device used in combination electric and mechanical drive systems to control the motor speed and torque by varying motor input frequency and voltage.

How does a VFD work?

VFDs operate on three different levels: operating at less than full load, oversized system designs, and motor energy use. When a system is operating a less than full load, the VFD works to reduce pump and fan motors to levels for efficient use of energy. Most HVAC systems are designed for peak load rather than the average load, which, when you think about it, makes sense. But a VFD makes up for those times when the system is not operating at peak (most of the operating hours) while triggering the system to work at the level appropriate for the load.

The nuts and bolts of it is that a VFD converts 60 cycle line current to direct current and then an output varying in voltage and frequency according to the load placed on the system. When the system load decreases, the VFD slows the motor. When it increases, it causes it to pick back up.

What does a VFD do for me?

The biggest advantage of a VFD is the major savings in energy costs. Every savings can be anywhere from 35 to 50 percent, and most VFDs offer a return on investment within two years, with some turning around the investment within as little as two months.

As a major bonus, a VFD also reduces normal wear and tear on the HVAC systems motors while simultaneously providing more control over its applications.

Install a VFD Today

If you’re in the market for a VFD for your HVAC unit, the pros at ACS can help. We are committed to using the latest and greenest technology to make your building work more efficiently to save you time, energy and money. Visit our website or give us a call at 888-265-2773.

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