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Siemens 331-2856, 332-2856 AP 331-3 Technical Instructions

Powers controls no. 6 pneumatic damper actuator.
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POWERS™ Controls
No. 6 Pneumatic Damper Actuator
331-2793 Actuator
Description
Features
Product Numbers
Application
331-2857 Actuator
with Clevis and Pin
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.
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
See Table 1.
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.
Technical Instructions
Document No. 155-029P25
December 3, 2004
331-3012 Extended Shaft and Frame
Mounting
Siemens Building Technologies, Inc.
AP 331-3

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   Summary of Contents for Siemens 331-2856, 332-2856 AP 331-3

  • Page 1 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. Technical Instructions Document No. 155-029P25 AP 331-3 December 3, 2004 331-3012 Extended Shaft and Frame Mounting Siemens Building Technologies, Inc.
  • Page 2 1/8-inch NPT Pivot, universal (extended shaft or frame mount) See Table 2 See Figure 13 through Figure 16 9 lb (4.08 kg) Complies with UL555 and UL555S Siemens Building Technologies, Inc. 8-13 psi (55-90 kPa) 331-3060 331-2988 331-2856 332-2856 331-3011...
  • Page 3 Travel Stop Kit (for model 3 and 4 actuators only) Damper Blade Rocker Arm Silicone diaphragms (package of five) Service Kits Siemens Building Technologies, Inc. 1/2-inch (13-mm) diameter, 2-1/4 inch (57-mm) rod (See TB-128 POWERS™ Controls Damper Shaft Extension Technical Bulletin 155-205P25)
  • Page 4 15 psi 18 psi (103 kPa) (124 kPa) 50 (5.6) 75 (8.5) 75 (8.5) 50 (5.6) 75 (8.5) 75 (8.5) 50 (5.6) 202 (22.8) 202 (22.8) 202 (22.8) Siemens Building Technologies, Inc. 25 psi (172 kPa) 75 (8.5) 75 (8.5)
  • Page 5 3. Slip the crank over the damper shaft. With the actuator assembly to the left of the 4. Position the mounting plate and attach it to the duct with four screws. 5. When the actuator cannot be directly mounted, drive the extended damper shaft Siemens Building Technologies, Inc. Item Part No.
  • Page 6 333-207 Clevis 331-293 Clevis Pin 331-807 Hitch Pin 331-941 Crank Assembly 331-623 Actuator Mounting Plate 034-283 Mounting Screws Material Steel Steel Steel Steel Steel Zinc Plated Steel Zinc Plated Steel Zinc Plated Steel — Steel Steel Siemens Building Technologies, Inc.
  • Page 7 5. Connect the actuator clevis to the crank. Put the damper in its normal position, open or closed. Stroke the actuator 1/4-inch (6 mm) with a hand pump, then tighten the crank setscrews. This will ensure tight damper closure. Siemens Building Technologies, Inc. Figure 4. Damper Blade Clip. Figure 5. One-section Damper.
  • Page 8 See Figure 6 and Figure 7 Page 8 POWERS™ Controls No. 6 Pneumatic Damper Actuator Figure 6. Two-section Damper. Figure 7. Actuator and Clevis Assembly 331-2857 (Typical) Attached to Frame Mounting Kit 752. Dimensions in Inches (Millimeters). Siemens Building Technologies, Inc.
  • Page 9 A threaded rod attached to the mounting plate and duct wall will normally work. Siemens Building Technologies, Inc. Actuator assembly: 331-3011, 331-3012, 331-3013, or 332-3011 Mounting Lug: 331-569 Figure 8.
  • Page 10 No. 6 Actuator extended shaft mounting Not used No. 4 Actuator extended shaft No. 6 Actuator frame mounting NC No. 6 Actuator frame mounting NO No. 4 Actuator frame mounting NC No. 4 Actuator frame mounting NO Siemens Building Technologies, Inc.
  • Page 11 Siemens Building Technologies, Inc. Dimensions in Inches (Millimeters). Figure 14. Offset Mounting Bracket 333-176. Dimensions in Inches (Millimeters). Technical Instructions Document No. 155-029P25 December 3, 2004...
  • Page 12 Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. POWERS is a trademark of Siemens Building Technologies, Inc. Other product or company names mentioned herein may be the trademarks of their respective owners.

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