Zonefirst ZDS-22X18 22WX18H Parallel 24V 2-Pos S/R

The Zonefirst ZDS-22X18 is a professional-grade motorized zone damper engineered for precision airflow management in rectangular HVAC ductwork. This 22W x 18H side-mount damper features parallel blade operation and is driven by a 24V spring return (S/R) motor, ensuring a fail-safe position in the event of power loss. Constructed with a heavy-duty extruded aluminum frame, the ZDS series utilizes 3-inch blades pivoting on self-lubricating bushings to provide silent operation and a long service life under static pressures up to 1.0" W.C. This 2-wire actuator system is designed for HVAC zone control, typically shipping as power-close/spring-open, though it can be field-converted for power-open applications to suit specific contractor requirements. The low-voltage damper is a drop-in solution for commercial zoning systems and residential retrofits where reliable forced-air distribution is critical.

Key Benefits:

• Extruded Aluminum Construction: Offers high corrosion resistance and structural integrity for demanding duct environments.
• Parallel Blade Precision: Optimized for high-volume airflow control with minimal turbulence.
• Fail-Safe 24V Actuator: The spring return motor provides a reliable default position, protecting equipment from overheating or freezing during power interruptions.
• Adjustable Minimum Position: Includes a manual set screw to allow bypass air, often eliminating the need for separate bypass dampers.
• Field Versatility: Simple two-wire connection allows for quick integration with standard zone control panels and easy field reversal of motor orientation.

Common Questions:

Can the motor be swapped for a power-open configuration?
Yes, while it ships as power-close, the linkage and actuator can be field-adjusted to operate as power-open/spring-close in just a few minutes using basic tools.

What size opening is required for installation?
A standard 4-inch slot cut into the side of the 22x18 duct is required. The damper is approximately 1/4-inch undersized to ensure smooth insertion and a proper seal against the internal duct walls.

How many ZDS dampers can I run on one transformer?
A standard 24VAC, 40VA transformer can typically power up to five ZDS motors. For systems requiring more units, verify the VA rating of your specific power source or use an isolation relay with additional transformers.

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.