Siemens Building Technology GRD121.1U Actuator 320720-756 and FOA series (100–300) unit

and FOA series (100–300) unit heaters

Built for heavy-duty HVAC gas regulator repair

the material composition including the brass body and specific seat materials are compatible with ammonia as well as standard halogenated refrigerants

preventing the premature breakdown of the drainage interface

This board is engineered to interface seamlessly with commercial water heaters and high-efficiency boilers

Siemens Building Technology GRD121.1U Actuator 320720-756 and FOA series (100–300) unitThe Siemens GRD121. 1U is a high torque 24V fire and smoke damper actuator engineered for precise 2 position control in critical life safety systems. As a veteran technician knows, reliability in smoke containment is non negotiable; this OpenAir electronic actuator delivers 30 lb in of torque to ensure positive closure against high velocity airflow. Operating on 24 VAC DC, the GRD121. 1U features a robust spring return fail safe mechanism that