Zonefirst ZD-8X8 8L X 8H Parallel 2 Pos 24V S/R

The Zonefirst ZD-8X8 is a professional-grade 8" x 8" parallel blade zone damper designed for precision airflow management in forced-air systems. Engineered with a 24V spring-return motor, this normally-open (N.O.) damper provides a fail-safe solution that defaults to the open position during power loss, ensuring continuous ventilation. As a direct drop-in for the legacy ZDS-8X8, it features an extruded aluminum frame and parallel blade design for low-leakage performance and quiet operation. The two-wire 24V S/R actuator integrates seamlessly with most HVAC zoning panels using M1 and M6 terminals. Its side-mount configuration and 3-inch blades allow for easy installation into standard rectangular ductwork, maintaining system efficiency by preventing static pressure build-up. For contractors handling retrofits or new builds, the ZD-8X8 offers a rugged, reliable replacement that eliminates the compatibility issues common with older 5-wire systems.

Key Benefits:

• Direct ZDS-8X8 Replacement: Matches legacy ZDS-8X8 specifications for simplified field retrofitting.
• Fail-Safe Operation: Power-close / spring-return open design ensures airflow remains unrestricted during power failures.
• Low Leakage Performance: Parallel blade construction and extruded aluminum frame provide a tight seal to maximize Zoning System efficiency.
• Universal 24V Compatibility: Two-wire installation works with Zonefirst and various third-party HVAC controls.
• Quiet Operation: Self-lubricating bushings ensure smooth blade rotation and reduced mechanical noise.

Common Questions:

Can I convert the ZD-8X8 from power-close to power-open in the field?
Yes, the ZD series damper can be field-converted to a normally-closed (N.C.) configuration by adjusting the internal linkage and motor orientation, though it is factory-shipped as normally-open.

How many ZD-8X8 dampers can I wire to a single 40VA transformer?
A standard 24VAC 40VA transformer can typically power up to five Zonefirst 24V damper motors when wired in parallel, depending on the current draw of other system components.

Is the motor mounted on the width or height dimension?
On the ZD-8X8, the motor is mounted on the 8" height dimension (Dimension 2), which is the standard side-mount configuration for this square damper size.

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.