Io Hvac Controls TD-20 Round Zone Damper 20 Inch 24V

Product Description

The IO HVAC CONTROLS TD-20 is a 20-inch round zone damper designed for use in forced-air HVAC distribution systems. It ships with a 60-second, 3-wire, 24-volt AC actuator that provides reliable open/close control for zoning applications. The blade assembly and actuator work together to regulate airflow through round ductwork, allowing individual zones to be conditioned independently. Licensed HVAC technicians install this damper as part of a zoning system during new construction or retrofit projects. At 18 pounds, this is a substantial assembly built for commercial-grade or large residential duct configurations.

This damper is suited for residential and light commercial forced-air zoning systems that use round duct runs. It is compatible with Trane AS zone control systems, making it a fit-in-place option for contractors working on those platforms. The 60-second actuator timing is appropriate for most residential and light commercial zoning controllers that require a standard 24-volt, 3-wire proportional or on/off signal. Typical installation scenarios include trunk-and-branch duct systems where individual room or zone control is required.

Key Features

• 20-inch round damper blade sized for large duct runs
• 3-wire, 24-volt AC actuator included with 60-second stroke timing
• Belimo-compatible actuator design for easy field replacement or substitution
• Compatible with Trane AS zone control systems
• Substantial 18-pound assembly suitable for large residential or light commercial applications

Compatibility

Compatible with Trane AS zone control systems. The 3-wire, 24-volt AC actuator interface is Belimo-compatible, allowing field substitution with equivalent Belimo actuators where required.

Installation Notes

Installation should be performed by a licensed HVAC technician. Power down the air handler and de-energize the 24-volt control circuit before mounting the damper or connecting actuator wiring. The damper must be installed in accessible ductwork to allow for actuator service or replacement. Follow local mechanical codes and the zone controller manufacturer wiring diagrams when connecting the 3-wire actuator leads.