About HVAC Controllers
HVAC controllers are used to monitor and control the performance of heating, ventilation and air conditioning systems (HVAC) in buildings. They monitor indoor environmental factors such as humidity and temperature, and control heating and cooling to achieve and maintain desired levels. HVAC controllers receive inputs from thermostats and humidity sensors, and send output to HVAC chillers and other HVAC systems. Most industrial thermostats are timed, programmable, and/or remote-controlled. The user interface for an HVAC controller may consist of a digital front panel with a menu or keypad, or include analog components such as knobs and switches. Computer-programmable, web-enabled, and Ethernet-ready HVAC controllers are commonly available. Some HVAC controls include a programmable logic controller (PLC). Others feature human machine interface (HMI) software or provide supervisory data acquisition and control (SCADA) functionality. An HVAC controller may also provide rate indication, data logging, and totalizing capabilities.
Engineering Web: HVAC Controllers - Machine Design
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