Resideo ZD20X8TZ Damper

For mid-sized commercial and residential zoning applications, the Resideo ZD20X8TZ Damper provides a robust, fail-safe solution for managing airflow. This 20" x 8" parallel blade zone damper features a power closed/spring return open configuration, ensuring the duct remains open in the event of a power loss. Designed for direct compatibility with Honeywell TrueZONE and other 24Vac forced air zoning systems, it utilizes a synchronous motor with a 30-second power timing and a 10-second spring return. The ZD20X8TZ serves as a high-efficiency direct replacement for ND-RSD-20X8-NO and the older ZDS-20X8 models. Constructed with an extruded aluminum frame and blades, this rectangular HVAC damper is built to withstand pressures up to 1 inch w.c. and features internal blade seals for low-leakage performance. The unit comes factory-assembled with the motor on the 8" side, simplified adjustable range stops, and a mechanical position indicator to streamline field verification for contractors.

• High-Performance Construction: Reinforced with extruded aluminum blades and frames for structural integrity and corrosion resistance in light commercial environments.
• Efficient Installation: Features a simple two-wire (M1 and M6) 24V motor setup, with an optional M4 terminal for LED status indication.
• Reliable Fail-Safe: The spring return actuator ensures the zone defaults to the open position, protecting HVAC equipment from excessive static pressure during power failures.
• Exact Retrofit Compatibility: Sized specifically to replace legacy normally open dampers like the ZDS-20X8 without extensive duct modification.
• Low Air Leakage: Parallel blade design provides better sealing than standard butterfly dampers, improving overall zoning system energy efficiency.

What is the primary application for the ZD20X8TZ?
This 24Vac zone damper is designed for rectangular ductwork where a normally-open damper is required to maintain airflow unless specifically closed by a zone controller.

Can the ZD20X8TZ be used with other zoning panels?
Yes, while optimized for Honeywell TrueZONE panels, its standard two-position 24V control makes it compatible with most 24Vac HVAC zone control systems.

How do I adjust the minimum/maximum air position?
The motor features integrated adjustable range stops that allow contractors to easily set the maximum closure or minimum opening to prevent total duct bypass or noise issues.

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.