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POWERS™ Controls No. 4 Pneumatic Damper Actuator Technical Instructions

Document Number 155-032P25

October 10, 2005

Siemens Building Technologies, Inc. Page 11

Frame Mounting

1. Order one each of the following:

Actuator assembly: 331-3000, 331-3001, 331-3002, 331-2973, or 331-3004

Mounting Lug: 331-569

2. Weld the mounting lug to the damper frame (Figure 10) so that it is parallel and

5/16-inch (8 mm) from the inside edge of the damper frame and perpendicular to it.

Weld the mounting lug along both sides. The mounting lug should be as close as

possible to the corner of the damper frame to minimize deflection. The damper

manufacturer should weld the lug.

3. If the damper frame is aluminum, light gauge sheet metal, or an unusual shape, bolt

a 3/16-inch (5-mm) thick, flat piece of steel to the frame. Then, weld the mounting

lug to the piece of steel.

4. Attach the rocker to the blade in the proper position for a normally open or normally

closed damper (Figure 10).

5. Attach the mounting plate to the mounting lug.

•

Normally open damper: Attach the plate to the lug (Figure 12). Place the pivot

post in Hole 6.

•

Normally closed damper: Attach the plate to the lug (Figure 13). Place the pivot

post in Hole 5.

Fasten the clevis to the rocker. Discard the crank and other parts not used.

7. The actuator mounting plate has a tendency to pivot at the point where the lug is

welded to the damper frame when the actuator strokes. It is recommended that

some means be devised in the field to prevent this from happening. A threaded rod

attached to mounting plate and duct wall will normally work.

Offset Mounting

Bracket

This bracket is designed to offset the Universal Mounting Plate 331-623 from ductwork

and insulation.

NOTE: Depending on the application, two brackets may be required to support the

actuator and universal mounting plate.

Figure 9. Offset Mounting Bracket 333-176.

Dimensions in Inches (Millimeters).

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