iO HVAC Controls HD-Motor 2-Wire 24VAC Damper Motor for D and HD Series

HD-MOTOR - 2-WIRE, 24VAC MOTOR FOR D and HD SERIES DAMPERS (RDMZ) For ARD round dampers, RZ3-1M 680474058020. Zonefirst models ZDS, ZDB, and RTS. For normally open, as used with Trol-a-Temp zone control systems. 2-Wire Spring Return Actuator 24V with durable gears, and easy to remove black plastic covers. Zonefirst replacement models ZDS, ZDB, and RTS. For use with dampers that are normally open.