Siemens Building Technology GRD221.1U Actuator 321894-709 Precision Thermal Sensing: Designed for

Precision Thermal Sensing: Designed for high-recovery systems where accurate temperature differentials are required for safety and efficiency

ensuring a consistent spray pattern that minimizes soot buildup and prevents electrode fouling

if the circuit is open or resistance is out of manufacturer-specified range

it delivers reliable LBP/HBP (Low and High Back Pressure) operation across an evaporating temperature range of -35°C to 15°C

and Payne N-coil and blower assemblies

Siemens Building Technology GRD221.1U Actuator 321894-709 Precision Thermal Sensing: Designed forThe 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