Siemens Building Technology GRD221.1U Actuator 322838-753 Standardized 170°F Open / 140°F

Standardized 170°F Open / 140°F Close calibration for accurate system protection

The 240V heater assembly utilizes high-grade nichrome wire

and UDAS75 model series unit heaters

Featuring a 24-inch diameter and a specific 27-degree pitch

Siemens Building Technology GRD221.1U Actuator 322838-753 Standardized 170°F Open / 140°FThe Siemens Building Technology GRD221. 1U Actuator is a specialized 120V fire and smoke damper actuator designed for critical life safety HVACR applications. As a veteran grade two position spring return actuator, it delivers 30 lb in of torque, ensuring reliable open close operation for smoke control and combination fire smoke dampers. Built to exceed the rigors of UL555 and UL555S standards, this unit provides a nominal 30 second drive time and a