Siemens Building Technology GRD121.1U Actuator 319848-301 As a genuine OEM replacement

As a genuine OEM replacement

balancing the superheat to prevent liquid slugging of the compressor while maximizing evaporator efficiency

the actuator features a built-in visual indicator to verify the open or closed state of the zone valve or damper quickly

Common Questions: Is the EK303S compatible with POE oils

Siemens Building Technology GRD121.1U Actuator 319848-301 As a genuine OEM replacementThe 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