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2. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

3. Thermostat - Wikipedia

   en.wikipedia.org/wiki/Thermostat

   A pneumatic thermostat is a thermostat that controls a heating or cooling system via a series of air-filled control tubes. This "control air" system responds to the pressure changes (due to temperature) in the control tube to activate heating or cooling when required.

4. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Zones are controlled by multiple thermostats. In water heating systems the thermostats control zone valves, and in forced air systems they control zone dampers inside the vents which selectively block the flow of air. In this case, the control system is very critical to maintaining a proper temperature.

5. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Electronic thermostats, instead, use a thermistor or other semiconductor sensor, processing temperature change as electronic signals to control the air conditioner. These controllers are usually used in hotel rooms because they are permanently installed into a wall and hard-wired directly into the air conditioner unit, eliminating the need for ...

6. BACnet - Wikipedia

   en.wikipedia.org/wiki/BACnet

   BACnet is a communication protocol for building automation and control (BAC) networks that use the ASHRAE, ANSI, and ISO 16484-5 standards [1] protocol.. BACnet was designed to allow communication of building automation and control systems for applications such as heating, ventilating, and air-conditioning control (), lighting control, access control, and fire detection systems and their ...

7. Direct digital control - Wikipedia

   en.wikipedia.org/wiki/Direct_digital_control

   Direct digital control is often used to control heating, ventilating, and air conditioning devices such as valves via microprocessors using software to perform the control logic. Such systems receive analog and digital inputs from the sensors and devices and, according to the control logic, provide analog or digital outputs. [1]