HVAC Control System

Colombus Air Conditioner Repairs is one of a trusted HVAC contractor serving the Columbus, OH area, our certified technicians can repair any make and model. HVAC control system is a computerized control system for climate control in buildings. Stand alone control devices may be pneumatic or electronic. Some people may have a microprocessor, but in order to be considered a “control system”, computerize and network the expected requirements. HVAC stands for heating, ventilation, air-conditioning and Control. Often, these integrate fire, security, and lighting control into one system. These systems typically use one or more of the command and control center to monitor the remote control terminal unit, and they communicate with one or more personal computers being used as an operator interface.

This control system is typically used on large commercial and industrial buildings to allow central control of HVAC units throughout the building. The latest systems use Ethernet for communication between central controllers – allow remote access from a web browser.

Direct digital control

Central controller and the controller unit most of the terminal can be programmed, which means direct digital control program code can be customized for use. Features of this program is the time schedule, setpoints, controllers, logic, timers, trend logs, and alarms. The control unit typically has analog and digital inputs that allow measurement variables (temperature, humidity, or pressure), and analog and digital outputs for controlling the transport media (hot / cold water and / or steam). Digital input normally contacts of control devices, and analog input voltage or current is usually measurement of a variable (temperature, humidity, velocity, or pressure) sensing device.

Digital output relay contacts are typically used to start and stop the equipment, and the analog output voltage or current is usually a signal for controlling the movement of water vapor medium control equipment such as valves, dampers, and motors.

DDC control group, network or not, forming a layer of its own system. These subsystems “” is critical to the performance and operation of the entire HVAC system basis. DDC system is the “brain” of the HVAC system. It determines the position of each dampers and valves in the system. This determines fans, pumps and run the chiller and at what speed or capacity. By this intelligency configured in the “brain”, we move into the building automation concepts.

Building Automation System

HVAC systems can be complex Building Automation System (BAS), to allow building owners to have greater control over the heating or cooling unit. Building owners can monitor the system and respond to alarms generated by the system from a local or remote location. This system can be scheduled for occupancy or configuration can be altered from the BAS. Sometimes BAS direct control of HVAC components. Depending on the BAS interface might be used.

The first is a pneumatic HVAC controllers, engineers may be understood as fluid control. So mechanical engineers can use their experience with the properties of steam and air to control the flow of hot or cold air. There is still a pneumatic HVAC system operates in several buildings, such as schools and offices, which can be centuries old.

After the air flow and temperature control standards, the use of electromechanical relays in ladder logic, to switch the dampers become standard. Finally, the relay into an electronic switches, such as transistors eventually be able to handle a larger load current. In 1985, the pneumatic control can no longer keep up with this new technology.

In 2000, the general computer control. Today, some controllers can be accessed by a web browser, which no longer need to be in the same building with the HVAC equipment. This allows some economies of scale, as a single operations center can easily monitor thousands of buildings.