EWC Controls URD-8 Damper
The EWC Controls URD-8 Damper is a professional-grade 8-inch round motorized zone damper designed for high-performance airflow management in residential and light commercial HVAC zone control systems. Constructed from heavy 24-gauge galvanized steel with factory-rolled stiffening beads, this single-blade damper is engineered to withstand static pressures up to 1.5 in-WC. It features an integrated Poron sealing gasket and a double-layered blade design to ensure a 98% shut-off seal, preventing thermal bleed into inactive zones. The unit utilizes nylon bearings and a specialized ThermoTuff drive shaft, which acts as a thermal barrier to protect the actuator from extreme duct temperatures while ensuring quiet operation.
Driven by the MA-ND5 actuator, this three-wire power-open/power-closed system delivers 18 in/lb of torque for reliable blade positioning. Unlike spring-return models, this 24VAC floating actuator preserves energy by only drawing power during transition and remains in its last position if power is lost. For precise system balancing, the motor includes adjustable min/max end-stops, allowing technicians to field-set minimum CFM requirements. Diagnosing the EWC URD-8 is straightforward thanks to failsafe LED indicators—green for open and red for closed—which only illuminate once the blade has reached its full travel limit.
Key Benefits for Contractors- Heavy-Duty Construction: Built with 24-gauge galvanized steel and rolled beads for superior structural rigidity in high-velocity ducts.
- Precise Airflow Balancing: Integrated adjustable end-stops allow for manual field adjustment of full or minimum CFM flow.
- Zero Maintenance Design: Nylon bearings and a direct-drive ThermoTuff shaft eliminate the need for lubrication and reduce motor heat transfer.
- Advanced Diagnostics: Visual LED position indicators (Red/Closed, Green/Open) simplify troubleshooting without needing to open the ductwork.
- Efficient Actuation: The 18 in/lb torque motor features a NEMA 1 rated housing and a 3-wire terminal block for fast, secure wiring.
Is the EWC URD-8 compatible with non-EWC zone panels?
Yes, as long as the zone panel provides a 24VAC output and supports 3-wire power-open/power-closed (PO/PC) actuators, this damper will integrate seamlessly into the system.
Can I use the MA-ND5 motor to replace an older spring-return actuator?
No. The MA-ND5 actuator requires a 3-wire configuration for powered operation in both directions and is not a direct replacement for 2-wire spring-return (MA-RSD) motors.
What happens to the damper position if the power goes out?
Because the URD-8 uses a power-open/power-closed floating actuator, the blade will remain in its last energized position until power is restored and a new signal is sent from the zone controller.
This item is not eligible for free shipping.
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.
Original: $138.98
-65%$138.98
$48.64EWC Controls URD-8 Damper
The EWC Controls URD-8 Damper is a professional-grade 8-inch round motorized zone damper designed for high-performance airflow management in residential and light commercial HVAC zone control systems. Constructed from heavy 24-gauge galvanized steel with factory-rolled stiffening beads, this single-blade damper is engineered to withstand static pressures up to 1.5 in-WC. It features an integrated Poron sealing gasket and a double-layered blade design to ensure a 98% shut-off seal, preventing thermal bleed into inactive zones. The unit utilizes nylon bearings and a specialized ThermoTuff drive shaft, which acts as a thermal barrier to protect the actuator from extreme duct temperatures while ensuring quiet operation.
Driven by the MA-ND5 actuator, this three-wire power-open/power-closed system delivers 18 in/lb of torque for reliable blade positioning. Unlike spring-return models, this 24VAC floating actuator preserves energy by only drawing power during transition and remains in its last position if power is lost. For precise system balancing, the motor includes adjustable min/max end-stops, allowing technicians to field-set minimum CFM requirements. Diagnosing the EWC URD-8 is straightforward thanks to failsafe LED indicators—green for open and red for closed—which only illuminate once the blade has reached its full travel limit.
Key Benefits for Contractors- Heavy-Duty Construction: Built with 24-gauge galvanized steel and rolled beads for superior structural rigidity in high-velocity ducts.
- Precise Airflow Balancing: Integrated adjustable end-stops allow for manual field adjustment of full or minimum CFM flow.
- Zero Maintenance Design: Nylon bearings and a direct-drive ThermoTuff shaft eliminate the need for lubrication and reduce motor heat transfer.
- Advanced Diagnostics: Visual LED position indicators (Red/Closed, Green/Open) simplify troubleshooting without needing to open the ductwork.
- Efficient Actuation: The 18 in/lb torque motor features a NEMA 1 rated housing and a 3-wire terminal block for fast, secure wiring.
Is the EWC URD-8 compatible with non-EWC zone panels?
Yes, as long as the zone panel provides a 24VAC output and supports 3-wire power-open/power-closed (PO/PC) actuators, this damper will integrate seamlessly into the system.
Can I use the MA-ND5 motor to replace an older spring-return actuator?
No. The MA-ND5 actuator requires a 3-wire configuration for powered operation in both directions and is not a direct replacement for 2-wire spring-return (MA-RSD) motors.
What happens to the damper position if the power goes out?
Because the URD-8 uses a power-open/power-closed floating actuator, the blade will remain in its last energized position until power is restored and a new signal is sent from the zone controller.
This item is not eligible for free shipping.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The EWC Controls URD-8 Damper is a professional-grade 8-inch round motorized zone damper designed for high-performance airflow management in residential and light commercial HVAC zone control systems. Constructed from heavy 24-gauge galvanized steel with factory-rolled stiffening beads, this single-blade damper is engineered to withstand static pressures up to 1.5 in-WC. It features an integrated Poron sealing gasket and a double-layered blade design to ensure a 98% shut-off seal, preventing thermal bleed into inactive zones. The unit utilizes nylon bearings and a specialized ThermoTuff drive shaft, which acts as a thermal barrier to protect the actuator from extreme duct temperatures while ensuring quiet operation.
Driven by the MA-ND5 actuator, this three-wire power-open/power-closed system delivers 18 in/lb of torque for reliable blade positioning. Unlike spring-return models, this 24VAC floating actuator preserves energy by only drawing power during transition and remains in its last position if power is lost. For precise system balancing, the motor includes adjustable min/max end-stops, allowing technicians to field-set minimum CFM requirements. Diagnosing the EWC URD-8 is straightforward thanks to failsafe LED indicators—green for open and red for closed—which only illuminate once the blade has reached its full travel limit.
Key Benefits for Contractors- Heavy-Duty Construction: Built with 24-gauge galvanized steel and rolled beads for superior structural rigidity in high-velocity ducts.
- Precise Airflow Balancing: Integrated adjustable end-stops allow for manual field adjustment of full or minimum CFM flow.
- Zero Maintenance Design: Nylon bearings and a direct-drive ThermoTuff shaft eliminate the need for lubrication and reduce motor heat transfer.
- Advanced Diagnostics: Visual LED position indicators (Red/Closed, Green/Open) simplify troubleshooting without needing to open the ductwork.
- Efficient Actuation: The 18 in/lb torque motor features a NEMA 1 rated housing and a 3-wire terminal block for fast, secure wiring.
Is the EWC URD-8 compatible with non-EWC zone panels?
Yes, as long as the zone panel provides a 24VAC output and supports 3-wire power-open/power-closed (PO/PC) actuators, this damper will integrate seamlessly into the system.
Can I use the MA-ND5 motor to replace an older spring-return actuator?
No. The MA-ND5 actuator requires a 3-wire configuration for powered operation in both directions and is not a direct replacement for 2-wire spring-return (MA-RSD) motors.
What happens to the damper position if the power goes out?
Because the URD-8 uses a power-open/power-closed floating actuator, the blade will remain in its last energized position until power is restored and a new signal is sent from the zone controller.
This item is not eligible for free shipping.
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.
