Resideo zd20x24tz/u Zone Damper 20x24 in 2-position 24V

Product Description

The RESIDEO zd20x24tz/u is a parallel-blade zone damper designed for residential and light commercial zoned HVAC duct systems. Operating on 24 volts, this damper uses a 2-position, spring-return actuator that drives the blades fully open or fully closed on demand, then returns to the fail-safe position when power is removed. The 20-inch by 24-inch frame fits standard rectangular ductwork of that size. Licensed HVAC technicians install this damper as part of a zoning system to control airflow to individual zones, improving comfort and system efficiency.

This zone damper is suited for forced-air zoning applications in residential and light commercial buildings. It installs inline in rectangular supply or return ductwork and is controlled by a zone panel or thermostat output sending a 24-volt signal. The parallel blade configuration provides straightforward open-close airflow control. Typical installations pair this damper with a compatible zone control panel and multiple zone thermostats to divide a single air handler or furnace system into independently controlled comfort zones.

Key Features

• 2-position actuator opens and closes fully for on-off zone airflow control
• Spring-return mechanism returns damper to fail-safe position on power loss
• 24-volt control voltage compatible with standard zone panels and low-voltage thermostat wiring
• Parallel blade design fits 20-inch by 24-inch rectangular duct openings
• Suitable for residential and light commercial forced-air zoning systems

Compatibility

Designed as an OEM-style replacement or new-installation zone damper for 20-inch by 24-inch rectangular ductwork in 24-volt forced-air zoning systems.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with low-voltage zoning controls and duct fabrication. Power down the air handler and de-energize the zone control panel before connecting or disconnecting any wiring. Ensure the damper frame is square and fully seated in the duct opening before securing to prevent blade binding. Follow local mechanical codes and the zone panel manufacturer wiring instructions for proper low-voltage circuit connections.

Technical Specifications

• Damper Size: 20 x 24 inches
• Blade Orientation: Parallel
• Control Voltage: 24 volts
• Actuator Type: 2-Position Spring Return

Standard Information

• Brand: RESIDEO
• Manufacturer Part Number: zd20x24tz/u