Ewc Controls ERSD-08 Round Motorized Damper 8 in 24V

Product Description

The EWC CONTROLS ERSD-08 is a round, single-blade spring return motorized damper designed for zone control and air quality applications in ducted HVAC systems. The body is constructed from 24-gauge galvanized steel, and the 24-volt motor actuator is direct-coupled to the drive shaft for reliable operation. The double-layered blade features an integrated cellular foam gasket that seals the damper in the closed position. A built-in travel limiter allows the damper to stop short of full closure when the application requires partial airflow. Licensed HVAC technicians install this damper as part of zoning or ventilation control systems.

The ERSD-08 is compatible with both flexible and rigid round ductwork in 8-inch diameter configurations. It ships as a power closed, spring open unit and can be field-reversed to a power open, spring closed configuration without additional parts. This makes it well suited for residential and light commercial zoning systems, makeup air applications, and fresh air intake control where reliable spring-return failsafe operation is required.

Key Features

• 24-gauge galvanized steel construction for durability in ducted environments
• 24-volt direct-coupled motor actuator for straightforward low-voltage wiring
• Power closed, spring open operation standard; field-reversible to power open, spring closed
• Double-layered blade with integrated cellular foam gasket for a positive seal at closure
• Built-in travel limiter prevents 100 percent closure when partial airflow is needed
• Compatible with both flexible and rigid round ductwork

Compatibility

Designed as an OEM-style replacement or new-installation round motorized damper for 8-inch ducted HVAC zoning and air quality systems using 24-volt control wiring.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes. De-energize the HVAC system and confirm 24-volt control power is off before connecting motor leads. The two-wire motor connection should be made at the zone control board or thermostat output following the control manufacturer's wiring diagram. Verify damper orientation and spring-return direction before securing to ductwork, and confirm the travel limiter setting matches the application requirement before system startup.

Technical Specifications

• Product Type: Spring Return Motorized Damper
• Shape: Round
• Size: 8 inches
• Voltage: 24 volts
• Wires to Motor: 2
• Blade Construction: Double-layered with integrated cellular foam gasket
• Body Material: 24-gauge galvanized steel
• Standard Operation: Power closed, spring open (field-reversible)
• Application: Air Quality

Standard Information

• Brand: EWC CONTROLS
• Manufacturer Part Number: ERSD-08