Siemens EA 746 Series Especificações descarregar pdf (Página 15)

Technical Instructions POWERS™ Controls No. 3 Pneumatic Damper Actuator

Document Number 155-146P25

September 18, 2008

Page 4 Siemens Building Technologies, Inc.

Table 3. Thrust Torque Ratings.

Maximum Thrust lb. (N) Torque Rating* lb-in (Nm)

Full Stroke Forward 2-Position Operation

Nominal

Spring

Rang

15 psi

(103 kPa)

18 psi

(124 kPa)

25 psi

(172 kPa)

Spring

Return

(No Stroke)

0 psig

(0 kPa)

Gradual

Operation

15 psi

(103 kPa)

18 psi

(124 kPa)

25 psi

(172 kPa)

3 to 7 psi

(21 to 48 kPa)

64 (285) 88 (391) 144 (641) 24 (107) 10 (1.1) 20.2 (2.3) 20.2 (2.3) 20.2 (2.3)

5 to 10 psi

(35 to 69 kPa)

40 (178) 64 (285) 120 (534) 40 (178) 10 (1.1) 33.6 (3.8) 33.6 (3.8) 33.6 (3.8)

8 to 13 psi

(55 to 90 kPa)

16 (71) 40 (178) 96 (427) 64 (285) 10 (1.1) 53.8 (6.1) 53.8 (6.1) 53.8 (6.1)

* With maximum hysteresis of 2.5 psi (17.2 kPa) @ 90° rotation.

Sizing

The size and quantity of actuators required depends on several damper torque factors:

• Damper type (standard or low leakage)

• Quality of damper installation

• Number of damper sections

• Air velocity

• Static pressure

• Age of damper

To determine

the correct actuator req

uired for the installation:

• Obtain the damper torque ratings (lb-i

n/sq-ft) from the damper manufacturer.

• Determine the area of the damper.

• Calculate the total torque required to move the damper.

• Select the appropriate actuator(s).

Installation

Extended Shaft

Mounting, Pivot

Mounting

For Actuators 331-4311, 331-4511, 331-4811, or 332-4811. These assemblies are

designe

d for 90° damper rotation.

NOTE: Clevis mounts in Crank Radius Hole No. 6 for 90° damper rotation.

Slip the 9/16-inch (14 mm) diameter hole in the mounting plate over

the damper

shaft (Figure 1).

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

inch (10 through 13-mm) diameter damper

shaft (Figure 2).

3. Position the mounting plate (Table 3).

4. Attach the mounting plate to the duct with four screws.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 32 33

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