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Heavy-Duty Circuit Protection: Includes robust capacitors and a reactor to filter DC current and protect against erratic power supply
look for 24V power at the 'R' terminal
allowing for precise notification of system pressure fluctuations
By delivering consistent resistance values to the ERC2 control board
Technicians should verify the 1/2-inch shaft diameter and mounting configuration to ensure a precise drop-in replacement for existing HVAC blower motors
Siemens Building Technology 331-2904 Actuator 320074-702 Heavy-Duty Circuit Protection: Includes robustThe 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