Abstract

Abstract : Direct digital control (DDC) is a term used by industry to identify digital control systems for heating, ventilating, and air conditioning (HVAC) systems. DDC is replacing pneumatic and electric control systems traditionally used in the HVAC industry. More than 90% of new construction is the U.S. today uses DDC. Its advantages over the older systems include: (1) lower maintenance, (2) more accurate and reliable temperature control, and (3) built-in energy and maintenance management functions.

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