These changes are typically a change in the control logic which is accomplishedby simply changing a computer program. Ease of Use The DDC system offers better control and data collection capabilities. With pneumatic controls, operator interaction must be performed at a local control panel. The operator must physically locateeach pneumatic control panel and read temperatures and change set point manually. DDC provides computer reports, full colorgraphics displays and the ability to remotely change the system set-points.
Remote access allows central operation, scheduling,and inspection of building conditions.
Records of all control strategies are automatically kept. Alarms can be generated whenbuilding equipment fails or requires calibration. The system can track energy consumption, equipment run time and temperaturetrends. QCAshould be applied during the initial concept phase and kept throughout the completion of the project. Without this support most programs fail.