Expand / Replace Direct Digital Control
Client: Department of Veterans Affairs
Location: Atlanta VA Medical Center, Decatur, GA
AKEA provided design for this project to expand or replace direct digital control (DDC) systems at the Atlanta VAMC, with Automated Logic Control (ALC) systems as a basis of design and with interface to the existing Tridium energy management system (EMS). The new DDC control system is a closed loop modulating system with proportional plus integral control. Work included design of new DDC systems to control existing HVAC variable air volume (VAV) systems serving numerous floors of the main tower. All associated pneumatic hot water reheat control valves, the main tower’s 225 existing control boards located on the VAV boxes, and all necessary components for a completely operational control system interface were replaced with the existing Tridium EMS. The design also included a new HVAC VAV DDC system serving two floors of the Community Living Center building (Building D) and a few zones in the Clinical Addition (Building A), replacement of the existing DDC fume hood control system and 10 control boards in Ambulatory Care (Building B), improved controls system operation for the air handling units located on the main tower roof, and integration of Building 13’s DDC system with the existing Tridium EMS. This project was a task order under an Atlanta VAMC IDIQ contract for AE services.