|
This is an electrical which is in the process of a changing of the old control system to a new DDC control system. Read more below.
|
This is an electrical which is in the process of a changing of 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 managment control. The old system is shown on the left while the new DDC control system is shown on the right. The new DDC Control system offered modern state of the art air conditioning and heating DDC control and the ability for building management and maintenance to monitor the system remotely over the internet.
This building had 40 Variable Volume Terminal (VVT) zones with 40 roof top air conditioning and heating units. This VVT system required static pressure control to control bypass dampers to relive excess static pressure when the VVT dampers close. The DDC system reads static presuure from a static pressure transducer. VVT systems read CFM's or air flow measure in Cubic Feet per Minute passing through the duct for the VVT zone. When the system requires heating CFM's are low and when the system is calling for air conditioning the CFM's are high. The air handlers in this sytem were constant volume.
