Siemens DDC 540-865EN TEC Variable Air Volume W/0-10V AO Heat Modulation & Co2

The Siemens DDC 540-865EN TEC Variable Air Volume AO Heat Modulation is a building automation component that is used to control the amount of air and heat that is delivered to the HVAC systems. It is a direct digital controller with a 0-10 V analogue, output for heat modulation and incorporates CO₂ sensing to regulate the rate of ventilation based on the space conditions. It is applied in variable air volume boxes, air handlers, and zone control applications where the coordination of airflow and thermal control is required. This control section processes sensor inputs and transmits signals.