ZoneFirst RDS-6 Damper

The ZoneFirst RDS-6 Damper is a professional-grade 6-inch round damper engineered for reliable airflow management in residential and light commercial HVAC zoning systems. This 24Vac spring return damper features a two-wire, two-position configuration, making it a compatible solution for the majority of 24-volt zone control panels. Constructed from heavy-duty galvanized steel, the RDS-6 uses a single-blade design with a high-torque synchronous motor that has been cycle-tested for long-term field performance. The normally open operation ensures fail-safe bypass or ventilation, while the actuator provides a powerful spring return to the default position upon loss of power. For custom system requirements, this unit is field-convertible from power-close to power-open in under two minutes. With its integrated minimum position adjustment, technicians can easily bleed air to prevent static pressure buildup without an external bypass. The RDS-6 damper motor provides 35 to 55 in-oz of torque, ensuring a positive seal in duct systems rated up to 1.0” W.C.

• Fail-Safe Operation: The spring return actuator ensures the damper returns to its primary state during power interruptions, preventing equipment freeze-up or overheating.
• Simplified Wiring: The two-wire damper design reduces installation time and limits potential points of failure at the terminal block.
• Flexible Configuration: Easily converted between normally open (NO) and normally closed (NC) configurations by simply moving the actuator to the secondary shaft position.
• Precise Airflow Control: Features a manual adjustment screw to set a minimum position, allowing for efficient air balancing across different zones.
• Industrial Build: Fabricated with 24-gauge galvanized steel to withstand typical duct velocities without blade rattle or structural deformation.

Is the ZoneFirst RDS-6 compatible with other zoning brands?
Yes, the 24Vac two-wire design is an industry standard, allowing it to interface with most HVAC zone control systems that output a 24V signal to drive dampers closed.

Can I install this damper in a vertical duct run?
While the RDS-6 can be installed in any orientation, it is recommended to mount the motor and blade shaft horizontally whenever possible to minimize bearing wear and ensure smooth damper motor travel.

How do I adjust the minimum airflow?
The actuator includes a set screw on the output shaft. By loosening this screw and aligning it with the markings on the motor body, you can prevent the blade from closing 100%, providing the necessary airflow control for specific rooms.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.