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UK provider of packaged plant rooms, Ellison AC, has long recognized the advantage of controlling pumps with VSD’s to provide the energy efficiency essential to meet the latest building regulations. The company decided to use ABB’s drive for HVAC, the ACH550, to control the pumps used in the heating, chilled water and condensed water applications in the packaged plant rooms, to provide their customers with the end-benefit of ABB’s HVAC drives.