Siemens Building Technology 331-4824 #3 Pneumatic Damper Actuator 8-13 PSI 2-3/4" Stroke

The Siemens 331-4824 is a compact No. 3 pneumatic damper actuator designed to provide precise modulating or two-position control in HVAC systems. This rolling diaphragm actuator features an ozone-resistant EP rubber diaphragm that delivers reliable performance for controlling airflow dampers in air handling units, ventilation systems, and fire/smoke control applications.

Key Features:

• 2-3/4 inch (70mm) stroke length for precise damper positioning
• 8-13 PSI (55-90 kPa) nominal spring range for consistent operation
• Clevis mounting with basic front-mount configuration
• Rolling diaphragm design with ozone-resistant EP rubber construction
• 1/8-27 NPT threaded air port with barb fitting for 1/4-inch O.D. tubing
• 3/8 inch-24 threaded output shaft for linkage assembly
• Operating temperature range: 32°F to 122°F
• Totally enclosed design for durability in demanding environments

This actuator is ideal for commercial and industrial HVAC applications requiring accurate damper control, including air handling units, ventilation systems, and fire-rated damper assemblies. The compact No. 3 size provides powerful actuation in a space-efficient package, while the pneumatic operation ensures reliable performance without electrical components.