Siemens EA 746 Series Especificaciones descargar pdf (Pagina 17)

Technical Instructions POWERS™ Controls No. 3 Pneumatic Damper Actuator

Document Number 155-146P25

September 18, 2008

Page 6 Siemens Building Technologies, Inc.

Installation,

Continued

Extended Shaft

Mounting, Fixed

Actuator

For Actuators 331-4314, 331-4514, 331-4814 order Linkage Kit 331-958.

For Actuators 331-4313, 331-4513, 331-4813, order Clevis 333-207 and Linkage Kit

331-958.

1. Determine the direction of the damper shaft rotation (clockwise or

coun

terclockwise) on an increase in pressure to the actuator.

2. Determine the angle of rotation required for the damper to move from closed to full

open.

NOTE: Since the actuator stroke is 2-3/8 inch (6 cm) and the angle of rotation is

known, the crank radius can be determined from the graph in TB181

Maximum Thrust Ratings of Pneumatic Damper Actuators Technical Bulletin

(155-219P25) or use Table 4.

3. Attach the link to the crank at the radius value determi

ned in Step 2.

4. Attach the clevis and other end of the linkage

to the actuator shaft (Figure 3).

5. The normal position of the damper (open or closed) and its direction of rotation

(CW or CCW) will dete

rmine the location of the actuator and linkage assembly

(Table 3).

6. Attach an air line or Baumanometer (squeeze bulb)

to the actuator and increase

pressure until the actuator shaft moves one half of its stroke, 1-3/16 inch (3 cm).

Select the correct location for the actuator assembly as determined in Step 5.

7. Slip the crank over the damper shaft and position the a

ssembly so that the actuator

shaft and link are straight and perpendicular to the crank.

8. Mark and attach the actuator bracket to the duct at this location. If this in

stallation

procedure is followed, there will be no problem with linkage scissoring or locking

up.

The installation is complete.

Item Description Item Description

1 Clevis Pin 4 Crank with Set Screw

2 Spring Washer 5 Hitch Pin

3 Washer, Nylon 6 Link, 4 inches (102 mm) long

Figure 3. Fixed Mounted Actuator Assembly with Linkage Kit 331-958.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 32 33

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