The Alerton VAViH-SD is a BACtalk series controller designed for single-duct Variable Air Volume (VAV) applications. It’s a compact, integrated unit that combines a controller, actuator, and airflow sensor—ideal for pressure-independent control in HVAC systems.

 Key Features

• BACnet-compliant: Seamlessly integrates with BACnet MS/TP networks.
• Built-in airflow sensor: Factory-calibrated for accurate velocity readings.
• Integrated actuator: Brushless, direct-coupled for reliable damper control.
• 5 universal inputs: Accept analog or binary signals.
• 6 binary outputs: Four hot-switched triacs and two ground-switched outputs.
• Flash memory: Stores all control algorithms and setup data for independent operation.
• Flexible mounting: Left or right actuator positioning with universal V-bolt clamp.

 Applications

• Single-duct VAV boxes in commercial buildings
• Retrofit or new construction HVAC systems
• Zones requiring precise airflow and temperature control

 Setup & Calibration Notes

• Supports DIP-switch selectable DDC applications for various VAV box types.
• Includes velocity zero cutoff and K-factor calibration to fine-tune airflow readings.
• Field technicians can adjust parameters via Microset wall units or operator workstations.