York YD model “C” dual compressor centrifugal chillers from Johnson Controls are now available with Optispeed variable speed drives (VSD) and an expanded capacity range of 1,500 – 6,000 tons (5,300 – 21,000 kW).
Reports say the addition of a unit-mounted low voltage or floor-mounted medium range VSD optimizes the chiller and improves its already outstanding part-load efficiency by as much as 13 percent.
In addition, the unit-mounted low voltage VSD nearly doubles the chiller range in several regional markets to meet more facility requirements. At AHRI conditions (460v/60Hz), the YD model “C” provides up to 3,000 tons (10,550 kW) of cooling.
During two years of extensive field testing around the globe, YD chillers with Optispeed VSD performed with exceptional reliability, both in low and medium voltage applications that included district cooling, hospitals and higher education facilities.
YD chillers utilize two YORK centrifugal compressors operating in parallel on a common set of heat exchanger shells to obtain large chiller capacities and efficient part load operation. Offering the most cooling capacity available per footprint, the chiller is ideal for retrofit applications, where large amounts of cooling are required in a small space. This remains true with the addition of the Optispeed VSD.
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