The new CENTURION rooftops have ENERGY STAR-certified efficiencies with up to 15.0 Seasonal Energy Efficiency Ratio (SEER) and achieve design criteria outlined in ASHRAE 55, "Thermal Environmental Conditions for Human Occupancy", and ANSI S12.60, "Acoustic Standard." The new series also supports LEED certification. CENTURION "PD" series rooftops use variable-capacity scroll compressors and variable-speed indoor fan systems. They are controlled by Carrier ComfortLink controls that monitor and control the units’ operations to help modulate the four- and five-ton units to as low as 1.5 tons of cooling to meet varying zone loads.

"The new PD series addresses our customers’ need for lower operational costs with higher comfort control and lower sound levels, particularly in single zone applications," said Ted Cherubin, Marketing Manager, Carrier Commercial Unitary Systems. Paul Holsinger, Product Manager, Carrier Commercial Unitary Systems Controls, said: "Carrier’s intelligent ComfortLink controls work the speed of both the variable compressor and fan to maintain supply air at 55º F,Similarly, if the supply air needs to be maintained at 65º F, the controls work in the same manner." The new PD series make maintenance easy with tilt-out economizers and items that slide-out, including condensate pans, four-inch filter racks and blower motor assemblies, reveals the company’s press release.