3/11/2013 Introduction to Building Automation Systems (BAS) Ryan R. Hoger, LEED AP 708.670.6383
[email protected] Building Automation Systems z Centralized controls z Change scheduling for multiple HVAC units at same time z Monitor “health” of equipment z Internet accessible z Alarming via text msg or email z Collect/trend data z Integrate to lighting control or security system 1 3/11/2013 z DDC - Direct Digital Control of an HVAC system z A method of monitoring and controlling HVAC system performance by collecting, processing, and sending information using sensors, actuators, and microprocessors. What is DDC? z DDC is the concept or theory of HVAC system control that uses digital controls z Physically, DDC encompasses all the devices used to implement this control method: a whole group of DDC controllers/microprocessors, actuators, sensors, and other devices. What is DDC? 2 3/11/2013 DDC - the Control Theory input-process-output cycle z A point is ANY input or output device used to control the overall or specific performance of equipment or output devices related to the equipment. What Is a Point? 3 3/11/2013 AI z Analog input -a sensor that monitors physical data, such as temperature, flow, or pressure. DI z Discrete input -a sensor that monitors status. Momentary and maintained switches, ON-OFF equipment status, and digital pulses from flow and electric power meters are discrete inputs. AOz Analog output - a physical action of a proportional device in the controlled equipment - e.g., actuator opens air damper from 20% to 40%, other dampers, valves, inlet guide vanes, etc.