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it delivers reliable LBP/HBP (Low and High Back Pressure) operation across an evaporating temperature range of -35°C to 15°C
The spring-loaded mechanism and adjustment handle are isolated from the liquid stream
if the circuit is open or resistance is out of manufacturer-specified range
suggesting internal component failure
Is the 1" NPT vent required to be piped away
Siemens Building Technology GRD221.1U Actuator 321894-709 it delivers reliable LBP/HBP (LowThe 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
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