Commercial DDC Controls

Direct digital control (DDC) systems allow for computerized monitoring of complicated HVAC systems. DDC systems evaluate environmental conditions, including temperature and humidity level, and then send outputs that control heating valves and regulate air. They are useful for building operators because they provide central monitoring and control. Operators can monitor and make changes from one central location. DDC systems also allow for more accurate energy management. They provide data analysis tools that aid building managers in optimizing performance and improving efficiency. This aids in controlling HVAC costs.

The structure and complexity of the DDC depends on building size. A smaller buildings DDC controls may consist of a single, computerized HVAC controller. Bigger buildings may employ tiered system. The first tier is a workstation with a dedicated computer or laptop and printer. An operator or technician uses these to send and receive information from the other tiers. The second tier is a system controller, and the third tier is a series of terminal controllers, each of which controls one major piece of equipment (a chiller, boiler, etc.). The terminal controllers feed their information to the system controller, which communicates with the workstation. In this way, a technician can monitor and communicate with all parts of the system at once from a centralized location.