Io Hvac Controls Nfx24-s N4 Spring-return Damper Actuator

Product Description

The IO HVAC CONTROLS nfx24-s n4 is a spring-return damper actuator rated at 10 Nm (90 in-lb) of torque and designed to operate on AC/DC 24 volts. It provides open/close control of HVAC dampers and returns to its fail-safe position automatically on power loss, making it a reliable choice for zone control and ventilation applications. The actuator features a NEMA 4X enclosure for protection against moisture and dust ingress. A 1/2-inch clamp with counterclockwise side cable entry and a 3-foot PVC-jacketed connector simplify field wiring. Run time is rated at 75 seconds for a 90-degree stroke. Licensed HVAC technicians typically handle installation in residential forced-air systems.

This actuator is suited for residential HVAC damper installations where reliable spring-return fail-safe operation is required. It fits standard damper shafts using the included clamp-style mounting, and its 24-volt AC/DC compatibility makes it straightforward to integrate with most low-voltage zone control boards and thermostats. The NEMA 4X rating makes it appropriate for installations in locations subject to moisture exposure, such as outdoor-accessible ductwork or mechanical rooms with high humidity. HVAC technicians will find the side cable exit and pre-wired PVC connector useful for tight duct or plenum installations.

Key Features

• Spring-return design provides automatic fail-safe positioning on power loss
• 10 Nm (90 in-lb) torque output for positive damper seating
• AC/DC 24-volt operation for compatibility with standard low-voltage control systems
• NEMA 4X enclosure rated for moisture and dust protection
• 90-degree stroke with 75-second run time
• 1/2-inch clamp with counterclockwise side cable exit and 3-foot PVC connector included

Compatibility

Designed as an OEM-style spring-return actuator for residential damper applications in low-voltage AC/DC 24-volt HVAC zone control systems.

Installation Notes

Installation should be performed by a licensed HVAC technician. De-energize the control system and verify zero voltage at the actuator terminals before wiring or mounting. Secure the clamp to the damper shaft per the manufacturer torque and positioning guidance, and confirm the fail-safe return direction matches the required damper position before restoring power. Follow applicable local mechanical codes and NEC requirements for low-voltage wiring.

Technical Specifications

• Torque: 10 Nm (90 in-lb)
• Voltage: AC/DC 24 volts
• Control Type: Open/Close spring-return
• Run Time: 75 seconds (90-degree stroke)
• Shaft Clamp Size: 1/2 inch
• Cable Exit: Counterclockwise side
• Connector: 3-foot PVC-jacketed connector
• Enclosure Rating: NEMA 4X
• Application: Residential
• Product Type: Damper Actuator

Standard Information

• Brand: IO HVAC CONTROLS
• Manufacturer Part Number: nfx24-s n4