Siemens 331-2856 - Manual

POWERS™ Controls
Technical Instructions
Document No. 155-029P25
AP 331-3
December 3, 2004
No. 6 Pneumatic Damper Actuator
331-2793 Actuator 331-2857 Actuator
with Clevis and Pin
331-3012 Extended Shaft and Frame
Mounting
Description The POWERS Controls No. 6 Pneumatic Damper Actuator is a heavy-duty, rolling
diaphragm, spring return actuator designed to drive large dampers, centrifugal
refrigeration inlet vanes, and other applications requiring a large, effective diaphragm
area 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 devices
Product Numbers
See Table 1.
Application
The No. 6 Pneumatic Damper Actuator controls outdoor, return air, exhaust, face and
bypass, and fan discharge dampers. It is recommended for heavy-duty applications
using multi-section dampers where either unison or sequence operation is required.
Certain actuators in Table 1 are UL Recognized Components for
fire/smoke applications under category EMKU2. This category covers
pneumatic damper actuators used on fire dampers and leakage rated
dampers.
Siemens Building Technologies, Inc.