What is a control in hvac?

In essence, controls are the devices in an electronic HVAC system that control various pieces of equipment. This occurs thanks to data communication between devices, hardware and computer systems. The definition of HVAC control systems may vary depending on whether it applies to a very basic residential application or potentially to an extremely complex large-scale application, but in short, HVAC controls consist of devices that control heating, ventilation and air conditioning operations (equipment).


, Ventilation and Air Conditioning (HVAC) controls cover a wide range of products, functions and supply sources.

We define control as starting and stopping or regulating heating, ventilation and air conditioning. Our concern here is control devices and systems for controlling larger commercial and industrial HVAC systems, not residential heating and cooling, except in some cases where residential controls become lightweight commercial controls. An HVAC control system is a computerized mechanism used to adjust the heating, air conditioning and ventilation components within a building. It can operate manually or automatically and is often customized based on the specific demands of each building.

The HVAC control system can be used to turn on or off an oven or air conditioner, or to adjust the temperature and other settings of these units. Depending on the application, these controls can also be used to adjust other types of building systems. In addition to allowing homeowners to easily control systems within a building, an HVAC control system is also used to maximize performance and energy efficiency. HVAC control systems are used to control the operations of heating, ventilation and air conditioning equipment.

An example of a control device is a thermostat. By lowering the thermostat, we control the functions of the air conditioning unit. HVAC controllers are used to monitor and control the performance of heating, ventilation and air conditioning (HVAC) systems in buildings. They monitor indoor environmental factors, such as humidity and temperature, and control heating and cooling to achieve and maintain desired levels.

With a properly functioning HVAC control system, you can automate the functions of your HVAC system, giving you time to deal with other urgent matters. HVAC equipment suppliers specify the number of inputs as the total number of signals sent to the HVAC controller. Most measuring devices do not require the use of control components because they have thermal expansion valves. The development and use of computers and microprocessors have brought about major changes in the HVAC control industry.

The VSD circuits will control the fan motors, the compressor and the condenser fan depending on the ambient temperature. We have studied a wide variety of control components in many different components of the HVAC system. Another name for closed-loop control is feedback because the system output is fed back as part of the input. The application of HVAC controls begins with understanding the building and HVAC systems, and the use of the spaces to be conditioned and controlled.

The evaporator, the measuring device, the air controller and the compressor require control components to operate. Therefore, as long as the pressure and temperature sensors do not detect an abnormal measurement, a control signal will activate the contactor. Some of the newcomers, who started with electrical and electronic controls, expanded to pneumatic controls, either through their own development or through partnership with foreign companies. Because these heating coils consume large amounts of electricity, a sequencing relay is used to help control energy consumption.

The condenser control board is also known as a defrost control board because it controls the defrost sequence. Then, various types of control products, such as pneumatic, electrical, analog, electronic, or direct digital electronic (DDC) control, can perform the basic control sequence. Discharge temperature controllers control the primary conversion rate (chillers or boilers) and pressure controls determine the delivery speed of the pumps or fans that distribute the central supply. .