Siemens Building Technology 331-2904 Actuator 320074-702 look for 24V power at

look for 24V power at the 'R' terminal

By delivering consistent resistance values to the ERC2 control board

This comprehensive boiler service kit includes high-grade gaskets

allowing for precise notification of system pressure fluctuations

This 3/4 HP programmable ECM motor utilizes advanced electronically commutated motor technology to deliver precise airflow across varying static pressures

Siemens Building Technology 331-2904 Actuator 320074-702 look for 24V power atThe Siemens 331 2904 is a heavy duty #4 pneumatic damper actuator designed for the gradual or positive actuation of large dampers in commercial ventilating systems. This piston type actuator features an all metal body construction and is specifically UL recognized for high stakes fire and smoke applications. With a 3 7 psi spring range and a generous 4 inch stroke, it provides the necessary force for reliable operation of outdoor air, return air, and