Siemens Building Technology 331-2904 Actuator
The 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 exhaust dampers. The unit includes an integral pivot mount, making it a drop-in solution for frame-mounted or extended shaft installations in terminal units like mixing boxes and unit ventilators. For field serviceability, the ozone-resistant EPDM rolling diaphragm is fully replaceable, ensuring long-term performance in demanding HVACR environments. The air connection utilizes 1/8-inch NPT internal threads, typically paired with a dual barb elbow fitting for standard 1/4-inch OD tubing. This pneumatic actuator is the industry standard for contractors requiring precise mechanical control and rugged durability in critical airflow management systems.
- UL Recognized: Certified for use in fire and smoke dampers to meet rigorous safety codes.
- Durable Construction: Features a robust all-metal housing and ozone-resistant EPDM diaphragm for extended service life.
- Versatile Mounting: Equipped with an integral pivot mount for flexible installation on various damper frames and extended shafts.
- High Torque Output: The 4-inch stroke and #4 motor size provide the thrust required for large damper control.
Common Questions
What is the primary application for the Siemens 331-2904?This actuator is primarily used for controlling HVAC dampers, mixing boxes, and air valves. Its UL rating makes it suitable for integrated fire and smoke safety systems where fail-safe operation is critical.
Can the diaphragm be replaced if it fails?Yes, the 331-2904 is designed with a replaceable EPDM rubber diaphragm, allowing technicians to rebuild the unit rather than replacing the entire metal assembly.
What mounting hardware is included with this specific model?The 331-2904 comes with an integral pivot mount. It is designed for applications where the actuator pivots as it strokes; however, additional linkage kits or mounting plates may be required depending on your specific damper configuration.
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.
Original: $153.84
-65%$153.84
$53.84Siemens Building Technology 331-2904 Actuator
The 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 exhaust dampers. The unit includes an integral pivot mount, making it a drop-in solution for frame-mounted or extended shaft installations in terminal units like mixing boxes and unit ventilators. For field serviceability, the ozone-resistant EPDM rolling diaphragm is fully replaceable, ensuring long-term performance in demanding HVACR environments. The air connection utilizes 1/8-inch NPT internal threads, typically paired with a dual barb elbow fitting for standard 1/4-inch OD tubing. This pneumatic actuator is the industry standard for contractors requiring precise mechanical control and rugged durability in critical airflow management systems.
- UL Recognized: Certified for use in fire and smoke dampers to meet rigorous safety codes.
- Durable Construction: Features a robust all-metal housing and ozone-resistant EPDM diaphragm for extended service life.
- Versatile Mounting: Equipped with an integral pivot mount for flexible installation on various damper frames and extended shafts.
- High Torque Output: The 4-inch stroke and #4 motor size provide the thrust required for large damper control.
Common Questions
What is the primary application for the Siemens 331-2904?This actuator is primarily used for controlling HVAC dampers, mixing boxes, and air valves. Its UL rating makes it suitable for integrated fire and smoke safety systems where fail-safe operation is critical.
Can the diaphragm be replaced if it fails?Yes, the 331-2904 is designed with a replaceable EPDM rubber diaphragm, allowing technicians to rebuild the unit rather than replacing the entire metal assembly.
What mounting hardware is included with this specific model?The 331-2904 comes with an integral pivot mount. It is designed for applications where the actuator pivots as it strokes; however, additional linkage kits or mounting plates may be required depending on your specific damper configuration.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The 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 exhaust dampers. The unit includes an integral pivot mount, making it a drop-in solution for frame-mounted or extended shaft installations in terminal units like mixing boxes and unit ventilators. For field serviceability, the ozone-resistant EPDM rolling diaphragm is fully replaceable, ensuring long-term performance in demanding HVACR environments. The air connection utilizes 1/8-inch NPT internal threads, typically paired with a dual barb elbow fitting for standard 1/4-inch OD tubing. This pneumatic actuator is the industry standard for contractors requiring precise mechanical control and rugged durability in critical airflow management systems.
- UL Recognized: Certified for use in fire and smoke dampers to meet rigorous safety codes.
- Durable Construction: Features a robust all-metal housing and ozone-resistant EPDM diaphragm for extended service life.
- Versatile Mounting: Equipped with an integral pivot mount for flexible installation on various damper frames and extended shafts.
- High Torque Output: The 4-inch stroke and #4 motor size provide the thrust required for large damper control.
Common Questions
What is the primary application for the Siemens 331-2904?This actuator is primarily used for controlling HVAC dampers, mixing boxes, and air valves. Its UL rating makes it suitable for integrated fire and smoke safety systems where fail-safe operation is critical.
Can the diaphragm be replaced if it fails?Yes, the 331-2904 is designed with a replaceable EPDM rubber diaphragm, allowing technicians to rebuild the unit rather than replacing the entire metal assembly.
What mounting hardware is included with this specific model?The 331-2904 comes with an integral pivot mount. It is designed for applications where the actuator pivots as it strokes; however, additional linkage kits or mounting plates may be required depending on your specific damper configuration.
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.
