Zonefirst ZDS-36X8 36WX8H Parallel 24V 2-Pos S/R

The Zonefirst ZDS-36X8 is a high-performance side mount zone damper engineered for horizontal or vertical trunk lines. Measuring 36 inches wide by 8 inches high, this 24V HVAC damper utilizes a 2-wire spring return motorized actuator (MSS motor), ensuring a fail-safe position when power is interrupted. Built from heavy-duty extruded aluminum with mitre angles and a zinc-plated linkage arm, the ZDS-36X8 is rated for static pressures up to 1.0” W.C. The parallel blade design incorporates 3-inch blades pivoting on self-lubricating Delrin bushings for silent, low-drag operation. Designed for quick field integration, the actuator can be reversed from its default power-closed/spring-open configuration to power-open/spring-closed in minutes. This damper integrates seamlessly with most 24VAC zone control panels, drawing only 7VA during operation, and features an adjustable minimum position set-screw to maintain bypass airflow without additional hardware.

• Engineered Durability: Extruded aluminum frame and parallel blades provide structural rigidity and corrosion resistance in light commercial and residential environments.
• Fail-Safe Actuation: The 2-wire 24V synchronous motor uses a heavy-duty spring to ensure the damper returns to the open position during power loss or leak detection events.
• Precision Control: Features an integrated minimum position adjustment to bleed air into zones, reducing the need for separate bypass dampers.
• Technical Compatibility: Fully compatible with A2L refrigerant safety requirements when wired through normally closed auxiliary contacts for emergency opening.
• Silent Operation: Self-lubricating bushings and a high-torque synchronous motor eliminate the rattling and humming common in lighter-duty dampers.

Can the ZDS-36X8 be converted to power-open?
Yes, the MSS motor and linkage can be field-converted from power-closed/spring-return-open to spring-return-closed/power-open to suit specific system requirements.

How do I wire multiple dampers to a single zone?
Up to five (5) dampers can typically be wired in parallel to a single 40VA transformer. For more than five dampers, an isolation relay and additional power source are required.

Where should the motor be positioned?
On the ZDS (Side Mount) model, the motor is located on the height dimension. During installation, ensure the electric actuator is oriented toward the top of the duct for optimal clearance and accessibility.

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.