Siemens DDC 540-517R Dual Duct Control

Siemens DDC 540-517R Dual Duct Control is a control that regulates airflow and temperature by controlling the hot and cold air streams to achieve accurate mixing, and distribution of air in dual-duct HVAC systems. It works using a direct digital control system which takes temperature sensor input and adjusts dampers to achieve desired zone conditions. It is installed in the control system or terminal unit and is connected to actuators, sensors and control wiring to coordinate operation. Its operation aids in proper temperature regulation, enhances energy performance, and provides stable zone comfort.