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Siemens 331-2856, 332-2856 AP 331-3 Technical Instructions
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POWERS™ ControlsTechnical InstructionsDocument No. 155-029P25AP 331-3December 3, 2004No. 6 Pneumatic Damper Actuator331-2793 Actuator 331-2857 Actuatorwith Clevis and Pin331-3012 Extended Shaft and FrameMountingDescription The POWERS Controls No. 6 Pneumatic Damper Actuator is a heavy-duty, rollingdiaphragm, spring return actuator designed to drive large dampers, centrifugalrefrigeration inlet vanes, and other applications requiring a large, effective diaphragmarea and long stroke.Features • All metal body construction• Replaceable ozone-resistant, silicone rubber, rolling diaphragm• Pivot mounting for extended shaft or frame mounting• Positioning relay (optional)• Adjustable forward travel stops (optional)• Three spring ranges for sequencing with other control devicesProduct Numbers See Table 1.Application The No. 6 Pneumatic Damper Actuator controls outdoor, return air, exhaust, face andbypass, and fan discharge dampers. It is recommended for heavy-duty applicationsusing multi-section dampers where either unison or sequence operation is required.Certain actuators in Table 1 are UL Recognized Components forfire/smoke applications under category EMKU2. This category coverspneumatic damper actuators used on fire dampers and leakage rateddampers.Siemens Building Technologies, Inc. |
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