Benefits of Building Automation Systems - Modern buildings use DDC controls for building automation systems. Building automation systems offer energy savings because they are energy management systems. These systems allow management to automatically control many processes involved with HVAC systems, lighting, and emergency systems. The systems are generally hooked up to the internet so monitoring and control can be done worldwide. (more…)
Air Handler Equipment DDC Controllers – These controllers will control an air handler once the wiring is completed. The panel is freshly mounted and waiting for the technician to run the piping and pull the wire from the control points. Other points, such as outside air, temperature sensors in piping or ductwork, flow meters, actuators, or other control points can be terminated to these controllers and the data collected from those input points can be networked over the entire building automation system through the communication trunks. (more…)
DDC Outside Air Economizer System - Outside louvers allow the DDC control system to open dampers and introduce fresh air into the building. Building automation system, or the energy management system as it is sometimes called, monitors outside air temperature and humidity and based on a calculation and opens the outside air dampers when this calculation determines a precise set point. (more…)
DDC Integration | HVAC DDC Controls - This is an electrical project which is in the process of changing the old control system to a new DDC control system. Installing new controls in an occupied building takes plenty of planning to avoid interruption in air conditioning or heating. The old control system was a basic electro-mechanical control system which little more than just basic building management control.
DDC Programming Logic Symbols 1 - DDC programming in HVAC Control can be rather complex especially to those who don’t understand software or programming. Some software and hardware manufacturers utilize symbols to build their logic programs for HVAC DDC control. Some of these logic blocks are rather complex but others are very simple. (more…)
DDC Programming Logic 3 - DDC control logic blocks have practically an unlimited way of arranging the blocks for HVAC control. Below is an example of a line of logic blocks arranged for static pressure control of a VAV air handler supply fan using a variable frequency drive. This same arrangement could also be used for static pressure control using a bypass damper instead of a VFD. (more…)
Programming DDC Logic 2 - The analog network input is similar to an analog input except this input is not hardwired to the local controller but on a remote controller in the network. It is very important that the communication works effectively for this analog network input to work. An example of this is the outside air temperature which is hardwired to a DDC controller in the penthouse of a multistory building.
The building engineer only wants the boilers to fire if the outside air temperature is less than 55° F. Instead of having an outside air temperature device hardwired to the boiler controller an analog network input can be placed into the boiler controller program and linked to the outside air temperature reading which is in the penthouse controller where the outside air temperature thermistor is hardwired. This saves devices and wires necessary for optimum control.
These Alerton controllers control a heat exchanger and air handler
Alerton Controllers DDC HVAC Control - HVAC DDC control has become an integral part of building automation systems. Modern DDC HVAC Control is a state-of-the-art computer-controlled system that adds efficiency to the system. These Alerton controllers are used to monitor and control an air handling unit for a large building. (more…)
