Installation Instructions

ManualsBrandsSiemens ManualsDampers#4 Pneumatic Damper Actuator w/ Integral Pilot, Clevis & Pin, Pivot Mount (8 to 13 psi)

Document No. 129-120

November 15, 2021

POWERS™ CONTROLS

No. 4 Pneumatic Damper Actuator

Item Number 129-120+5, Rev. HA Page 1 of 4

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.

Figure 1. Actuator Jam Nut Location.

Required Tools

• Flat-blade screwdriver

• Adjustable crescent wrench

• Pliers

Warning/Caution Notations

WARNING

Personal injury or loss of

life may occur if you do not

follow a procedure as

specified.

CAUTION

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, or

331-2973.

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 3. Extended Shaft Mounting.

3. Position the mounting plate and attach it to the

duct with four screws.

Summary of content (4 pages)

PAGE 1
Installation Instructions Document No. 129-120 November 15, 2021 POWERS™ CONTROLS No. 4 Pneumatic Damper Actuator Product Description Warning/Caution Notations WARNING 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.
PAGE 2
Document No. 129-120 Installation Instructions November 15, 2021 Table 1. No. 4 Damper Actuator Product Numbers.
PAGE 3
Document No. 129-120 Installation Instructions November 15, 2021 Installation, Continued 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.
PAGE 4
Document No. 129-120 Installation Instructions November 15, 2021 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.