Johnson Controls understands the pressure you have to trim the cost of operating a building without affecting occupant comfort or safety. To begin, start by looking at the energy consumed by your chillers. A proven tool for cutting chiller energy consumption is through installing a variable speed drive (VSD) on a chiller. A VSD can cut chiller energy use by 30 percent while keeping occupants comfortable. VSDs in centrifugal chillers have a 30-year history of success in facilities, so you can use them with confidence.

How can VSDs reduce chiller energy costs?

• At part load, a chiller with a VSD will use less energy than a constant speed chiller to meet the demand for chilled water, yet still provide a comfortable environment for occupants.
  
  
• Some chillers with VSDs can also take advantage of lower “lift” to save energy. Lower lift is a result of a lower cooling tower water temperature in cooler or drier weather. A chiller with a VSD has a lower life cycle cost than a constant speed chiller, providing a strong ROI. In fact, facility managers often recoup their investment within two years or less.