Successful DDC System Retrofits

Over the past, decade my firm has assisted a variety of clients (both public and private) to retrofit existing pneumatic or hybrid pneumatic/legacy direct digital control (DDC) systems to state-of-the-art DDC. The scope of these projects usually is limited to the central equipment and lighting, excluding zone controls. Clients often are lured by dreams of energy efficiency, vendor independence, faster control response and intuitive Web-based interfaces that expose the inner workings of their buildings. Is it possible to meet such high expectations? The answer is a resounding maybe.

Citation: ASHRAE Journal, Vol. 46, No. 6, June 2004



Product Code(s): D-21932