Siemens Building Technology 331-2929 Actuator

The Siemens 331-2929 Actuator is a heavy-duty No. 4 pneumatic damper actuator designed for professional HVACR installations requiring high-torque performance. Featuring a 3-7 psi spring range and a standard 4-inch stroke, this unit is engineered for the gradual or positive actuation of large dampers, mixing boxes, and terminal unit air valves. Built with a rugged, all-metal body and a replaceable EPDM rolling diaphragm, this pneumatic damper actuator ensures long-term reliability in demanding ventilating systems where ozone resistance and structural integrity are non-negotiable for contractors.

This specific model includes an integral pivot mount along with a clevis and clevis pin, making it ideal for frame mounting and extended shaft applications. Its 1/8-inch NPT female air connection and dual barb elbow fitting allow for seamless integration with 1/4-inch OD tubing during field installation. Whether managing outdoor air dampers on unit ventilators or static pressure control systems, the Siemens Building Technology 331-2929 provides the mechanical thrust necessary for precise HVAC pneumatic control.

• Pneumatic Precision: The 3-7 psi operating range allows for precise modulation in complex air handling unit sequences.
• Installation Flexibility: Equipped with an integral pivot mountain and clevis assembly for versatile mounting configurations.
• Durable Construction: Features a metal-fabricated body and high-grade EPDM diaphragm to withstand harsh mechanical room environments.
• Serviceability: Designed with a replaceable diaphragm to extend the service life of the pneumatic actuator without full removal of the assembly.

What is the primary application for the Siemens 331-2929?
This No. 4 pneumatic actuator is commonly used to control return air, exhaust, and unit ventilator outdoor air dampers in commercial HVAC systems.

Does this unit support frame mounting?
Yes, the 331-2929 includes a clevis and clevis pin specifically for use with frame mounting accessories and pivot-style installations.

What is the stroke length and air connection size?
This actuator provides a 4-inch stroke and utilizes a 1/8-inch NPT internal thread with a supplied dual barb elbow for 1/4-inch OD tubing.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.