Siemens Building Technology GJD221.1U Actuator 318172-701 typically securing with standard sheet

typically securing with standard sheet metal or machine screws

It is designed for hot water/hydronic systems

or if the fan runs continuously regardless of the heat cycle

Key Benefits: High-Accuracy Sensing: The 1k Ohm Platinum RTD element offers superior linearity and stability compared to standard thermistors

Siemens Building Technology GJD221.1U Actuator 318172-701 typically securing with standard sheetThe Siemens GJD221. 1U is a high performance fire smoke damper actuator designed for critical life safety applications. Engineered for 120V systems, this OpenAir model delivers 20 lb in torque to ensure reliable operation of UL listed smoke control and combination fire smoke dampers. As a veteran grade spring return actuator, it features a 2 position (on off) control signal with a rapid 30 second driving time and a 15 second fail safe spring return.