Siemens Building Technologies 331-2973 #4 Steel Pneumatic Damper Actuator Installation Manual

Installation Instructions

Document No. 129-120

October 3, 2017

POWERS™ CONTROLS

No. 4 Pneumatic Damper Actuator

Product Description

The No. 4 Pneumatic Damper Actuator is a totally enclosed pneumatic piston type actuator designed to actuate dampers for ventilating systems, mixing box control, and other applications requiring a large, effective diaphragm area and long stroke. The No. 4

Hesitation Actuator is frequently used to operate the outdoor air damper on unit ventilators.

Product Numbers

See Table 1.

Prerequisites

•

Ensure all kits are ordered and available for installation. Kits are listed with each mounting application.

•

Have the damper manufacturer drill the mounting holes.

•

Have the damper manufacturer weld the mounting lug to the damper frame in frame mounting installations.

WARNING:

Do not remove the jam nut (Figure 1).

Spring is under heavy load. Repair by trained personnel only.

Warning/Caution Notations

WARNING

CAUTION

Personal injury or loss of life may occur if you do not follow a procedure as specified.

Equipment damage or loss of data may occur if you do not follow a procedure as specified.

Installation

Extended Shaft Mounting-Pivot Actuator

Expected Installation Time: 28 minutes

Actuators: 331-3000, 331-3001, 331-3002,

331-2973, or 331-3004.

These assemblies are designed for 90° damper rotation.

NOTE : Clevis mounts in Crank Radius Hole No. 1 for 90° damper rotation.

1. Slip 3/4-inch (19 mm) diameter hole in the mounting plate over the damper shaft

(Figure 2).

Figure 2. Actuator Mounting Plate.

2. Slip the crank over the 3/8 through 1/2-inch

(10 through 13-mm) diameter damper shaft

(Figure 3).

Figure 1. Actuator Jam Nut Location.

Required Tools

•

Flat-blade

•

Adjustable

•

Pliers

Item Number 129-120+5, Rev. GA

Figure 3. Extended Shaft Mounting.

3. Position the mounting plate and attach it to the duct with four screws.

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Document No. 129-120

Installation Instructions

October 3, 2017

Table 1. No. 4 Damper Actuator Product Numbers.

Description Mounting Style

3-7 psi

(21-48 kPa)

3-13 psi

(21-90 kPa)

Product Numbers

Nominal Spring Range

5-10 psi

(35-69 kPa)

8-13 psi

(55-90 kPa)

331-2910 — 331-2917 331-2963

2-3, 8-13 psi

(14-21, 55-90 kPa)

Hesitation Model

— Actuator, mounting screws

(non-pivot)

Actuator, bracket

(non-pivot) 3-inch stroke for unit ventilator

Actuator, bracket

(non-pivot) 2-3/8 inch stroke for unit ventilator

Actuator, mounting plate, ball joint connector

Actuator, mounting plate, ball joint connector with positioning relay

Actuator, integral pivot

Actuator, integral pivot, clevis and clevis pin for use with frame mounting accessory

Actuator, integral pivot with pivot post 2

Actuator, integral pivot with pivot post, and positioning relay 2

Front

Fixed

Fixed

Fixed

Fixed

Pivot

Pivot

Universal kit

Universal kit with positioning relay

—

—

—

—

331-2904 1 331-2905

1

331-2906 1 331-2961 1 331-2909

1

331-2929 331-2930 331-2931 331-2968 —

331-3000 331-3001 331-3002 331-2973 1 331-3004

—

—

—

331-3018

—

—

—

—

—

—

—

—

—

331-3017

—

332-2973

331-2927

331-2974

—

—

—

1 UL Recognized Components for Fire/Smoke Applications.

2 Mounted on plate for extended shaft with clevis and crank for 3/8-inch (10-mm), 7/16-inch (11-mm), or 1/2-inch

(13-mm) diameter shaft. Parts for frame mounting (blade drive) are included with kit.

NOTE: When the actuator is ordered with universal mounting, the mounting plate, pivot post and hardware, clevis, damper crank, rocker arm, and all screws/nuts are included. Order other frame mounting accessories as required if not supplied by damper manufacturer.

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Document No. 129-120

Installation Instructions

October 3, 2017

Installation, Continued

Extended Shaft Mounting-Fixed Actuator

Expected Installation Time: 28 minutes

Actuator with mounting bracket: 331-2927 or

331-2974

Clevis: 331-801

Linkage Kit: 331-958

1. Determine the application from Table 2 and then select appropriate "X" and "Y" dimensions.

Select a rigid section of the duct, if possible, and draw these lines on the duct.

CAUTION:

It is important to use the "X" and "Y" dimensions from Table 2 to position the actuator to ensure that the crank is approximately perpendicular to the actuator shaft at half its stroke (see

Figure 4). This will prevent the linkage from scissoring or locking up.

Table 2. Fixed Mounted Assembly Dimensions.

Application

4-inch (102 mm)

Stroke – 90° Rotation

4-inch (102 mm)

Stroke – 70° Rotation

3-inch (76 mm)

Stroke – 90° Rotation

3-inch (76 mm)

Stroke – 60° Rotation

Dimensions in

Inches (mm)

X

8-1/2

(216)

8-1/2

(216)

8

(203)

8

(203)

Y

2

(51)

3

(76)

1-1/2

(38)

2-1/2

(64)

Crank

Radius

Hole

1

2

3

4

NOTE: Crank Radius Holes No. 5 and 6 are used for No. 3 Pneumatic Damper Actuators only.

2. Place front of actuator on "X" dimension line so that the actuator shaft faces damper shaft.

Place center line of actuator over "Y" dimension line (see Figure 5).

3. Thread Clevis 331-801 on to actuator shaft and tighten against locknut. Assemble Linkage Kit

331-958 to actuator assembly (see Figure 4).

The linkage is assembled so that the damper shaft will rotate counterclockwise as actuator pressure increases. This is a typical normally closed damper installation.

Figure 5. Fixed Mounted Actuator Assembly.

Frame Mounting

Expected Installation Time: 3 hours

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

1. 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 where the mounting lug is to attach. The mounting lug can then be welded to it.

2. Weld the mounting lug parallel and 5/16-inch

(8 mm) from the inside edge of the damper frame and perpendicular to it (Figure 6). Weld the lug along both sides. The 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.

Figure 4. Perpendicular Mounting.

Siemens Industry, Inc.

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Document No. 129-120

Installation Instructions

October 3, 2017

Figure 6. Frame Mounting Dimensions.

Dimensions in Inches (Millimeters).

4. Attach rocker to blade in proper position for normally open or normally closed damper

(Figure 6).

5. Attach mounting plate to mounting lug.

a. Normally closed damper: attach plate to lug

(Figure 7). Place pivot post in Hole 5.

Figure 8. No. 4 Actuator Frame Mounting,

Normally Open Damper.

6. Fasten clevis to rocker. Discard 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 the mounting plate and duct wall will normally work.

Hesitation Actuator Adjustment

Expected Installation Time: 15 minutes

1. To obtain an initial hesitation point, add air pressure to actuator until shaft travels the desired distance.

2. Turn locknuts on cycle adjustment rods until they contact lower housing and then lock together. Tighten cycle adjustment nuts evenly to ensure smooth operation.

The installation is now complete.

References

AP 331-2 POWERS™ Controls No. 4 Pneumatic

Damper Actuator Technical Instructions,

(155-032P25)

TB 181, Maximum Thrust Ratings of Pneumatic

Damper Actuators Technical Bulletin, (155-219P25)

Figure 7. No. 4 Actuator Frame Mounting,

Normally Closed Damper.

b. Normally open damper: attach plate to lug

(Figure 8). Place pivot post in Hole 6.

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 Industry, Inc. Other product or company names mentioned herein may be the trademarks of their respective owners. © 2017 Siemens Industry, Inc.

Siemens Industry, Inc.

Building Technologies Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089-4513

USA

+1 847-215-1000

Your feedback is important to us. If you have comments about this document, please send them to [email protected]

Document No. 129-120

Printed in the USA

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