This device is a VAV (Variable Air Volume) Control Module used in HVAC air distribution systems.

Model:

VRU-D3-VR

Key Features:

• Communication: RS-485 (Modbus RTU)

• Input/Output: 0–10V analog

• Power supply: AC/DC 24V ±10%

• Pressure range: 0–500 Pa

• Built-in differential pressure sensing (via blue and yellow tubes)

Function:

The module measures air pressure difference inside a VAV box and converts it into airflow control signals.
It communicates with a BMS (Building Management System) via RS-485 and controls the damper actuator using 0–10V output.

Typical Applications:

• VAV terminal units

• Air Handling Units (AHU)

• Smart building HVAC systems

• Office and commercial air distribution systems