The A150 is the direct OEM replacement for the discontinued 9447 motor

non-spring return damper actuator engineered for precise proportional modulation in commercial HVAC systems

What is the thread size for the air connection

the system may cycle unnecessarily

Siemens Building Technology 331-2856 Actuator 322057-301 The A150 is the directThe Siemens 331 2856 is a heavy duty Powers Controls No. 6 pneumatic actuator designed for reliable linear control of large dampers, centrifugal refrigeration inlet vanes, and multi section ventilation systems. This pneumatic damper actuator features a rugged, all metal body construction to withstand demanding mechanical environments. It operates on a nominal 8 13 psi spring range, providing the high torque performance required for outdoor air,