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System Integrity: Fast-acting SPST switch logic provides immediate feedback to the control board to protect against combustion or airflow failures
it utilizes NBR seals to maintain a bubble-tight shut-off across a pressure range of 0-125 PSI
The 240V heater assembly utilizes high-grade nichrome wire
allowing technicians to perform essential preventative maintenance without the expense of a full valve replacement
Siemens Building Technology GRD221.1U Actuator 322838-753 System Integrity: Fast-acting SPST switchThe 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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