Siemens 331-2856, 332-2856 AP 331-3 User Manual

POWERS™ Controls

Technical Instructions

Document No. 155-029P25

AP 331-3

December 3, 2004

No. 6 Pneumatic Damper Actuator

331-2793 Actuator

Description

Features

331-2857 Actuator

with Clevis and Pin

The POWERS Controls No. 6 Pneumatic Damper Actuator is a heavy-duty, rolling
diaphragm, spring return actuator designed to drive large dampers, centrifugal
refrigeration inlet vanes, and other applications requiring a large, effective diaphragm
area and long stroke.

• All metal body construction

• Replaceable ozone-resistant, silicone rubber, rolling diaphragm

• Pivot mounting for extended shaft or frame mounting

• Positioning relay (optional)

• Adjustable forward travel stops (optional)

331-3012 Extended Shaft and Frame

Mounting

Product Numbers

Application

• Three spring ranges for sequencing with other control devices

See Table 1.

The No. 6 Pneumatic Damper Actuator controls outdoor, return air, exhaust, face and
bypass, and fan discharge dampers. It is recommended for heavy-duty applications
using multi-section dampers where either unison or sequence operation is required.

Certain actuators in Table 1 are UL Recognized Components for
fire/smoke applications under category EMKU2. This category covers
pneumatic damper actuators used on fire dampers and leakage rated
dampers.

Siemens Building Technologies, Inc.

Technical Instructions POWERS™ Controls No. 6 Pneumatic Damper Actuator
Document No. 155-029P25
December 3, 2004

Table 1. Product Numbers for No. 6 Pneumatic Damper Actuators.

Description

Actuator, integral pivot Pivot 331-2793 331-2794

Actuator, integral pivot and forward travel stops (Figure

1)

Actuator with clevis for frame mounting (Figure 2) or
remote extended shaft mounting (Figure 3)

Actuator with clevis and positioning relay (Figure 16)

Actuator, integral pivot with pivot post 3

Actuator, integral pivot with pivot post and positioning

3

relay

(Figure 16)

1

UL Recognized Components for Fire/Smoke Applications.

2

Also order frame mounting kit accessories.

3

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

Mounting Style

Pivot — 331-2796 331-2988

Pivot

Pivot

Extended Shaft 331-3012 331-3013

Extended Shaft with
Positioning Relay

3-8 psi

(21-55 kPa)

2

2

331-2857 331-2858

— — 332-2856

— — 332-3011

Product Numbers

Nominal Spring Range

3-13 psi

(21-90 kPa)

(55-90 kPa)

331-3060

331-28561

331-30111

8-13 psi

1

(13-mm) diameter shaft. Parts for frame mounting (blade drive) 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.

Specifications

Effective diaphragm area 17.9 inches2 (115 cm2)
Stroke 4 inch (102 mm)
Housing Aluminum
Stem Type 416 stainless steel
Diaphragm Ozone-resistant silicone rubber
Spring Steel
Bearing Bronze oilite
Maximum air pressure 30 psig (210 kPa)
Nominal spring ranges 3 to 8 psi (21 to 55 kPa)

3 to 13 psi (21 to 90 kPa)
8 to 13 psi (55 to 90 kPa)

Ambient temperature range
Operation -20°F to 200°F (-29°C to 93°C)

Air connection 1/8-inch NPT
Type of mounting Pivot, universal (extended shaft or

frame mount)
Thrust and torque rating See Table 2
Dimensions See Figure 13 through Figure 16
Shipping Weight 9 lb (4.08 kg)
Agency Approvals Complies with UL555 and UL555S

Page 2 Siemens Building Technologies, Inc.

POWERS™ Controls No. 6 Pneumatic Damper Actuator Technical Instructions
Document No. 155-029P25
December 3, 2004

Accessories

Service Kits

Damper shaft extension kits:
1/2-inch (13-mm) diameter, 2-1/4 inch (57-mm) rod 331-631
(See TB-128 POWERS™ Controls Damper Shaft Extension
Technical Bulletin 155-205P25)

1/2-inch (13-mm) diameter, 9-inch (229-mm) long hollow rod 333-184
1/2-inch (13-mm) diameter, 9-inch (229-mm) long rod 333-042
1–inch (25–mm) diameter 11-5/8 inch (295-mm) long (Ruskin) 333–194
Damper shaft extension kit adapter - 3/8 inch (10 mm) diameter 331-632

(for use with Damper Shaft Extension Kit 333-042)
Actuator shaft extensions:
10-1/8 inch (257-mm) long 331-434A
Adapter kit for 1/2-inch NPT pipe 333-030
Cranks - damper shaft:
3/8-inch (10-mm) - 1/2-inch (13-mm) diameter,
Selectable radius 331-941
5/8-inch (16-mm) diameter 333-182
3/4-inch (19-mm) diameter 333-183
1-inch (25-mm) diameter 333-181
Cast iron crank with set screws 333-078
Linkage kit, 4-inch (102-mm) link and crank 331-958
Universal mounting plate

3/4-inch shaft 331-623
1-inch shaft (use with 333-194) 331-623A

Flange bearing (1/2 inch, 13 mm) 331-862
(for 331-623 Universal Mounting Plate)

Right angle mounting plate 333-208
Remote mounting kit (extended shaft), Figure 3 331-618
Positioning relay 147-2000
Positioning relay mounting kit 147-276
Frame mounting kits

One-section damper (Figure 5) 751*
Two-section damper (Figure 6) 752*
* Order frame mounting kits and damper blade clip kit from

Arrow United Industries.
Frame mounting lug 331-569
Mounting lug screws (three required for frame mounting lug) 034-123K
Offset Mounting Bracket (Figure 14) 333-176
Travel Stop Kit (for model 3 and 4 actuators only) 333-197
Damper Blade Rocker Arm 333-034
Screws (two) 030 510J
Nuts (two) 041-230J

Silicone diaphragms (package of five) 333-572

Siemens Building Technologies, Inc. Page 3

Technical Instructions POWERS™ Controls No. 6 Pneumatic Damper Actuator
Document No. 155-029P25
December 3, 2004

Actuator Sizing

The quantity of actuators required depends on several torque factors. To determine the
quantity of actuators required for the installation:

1. Obtain damper torque ratings (ft-lb/ft

2. Determine the area of the damper.

3. Calculate the total torque required to move the damper:

Total Torque = Torque Rating x Damper Area

4. Calculate the total quantity of actuators required:

Number of Total Damper Torque Required

Actuators

1

Safety Factor: When calculating the number of actuators required, a safety factor

=

1

× Actuator Torque (see Table 2)

SF

should be included for unaccountable variables such as slight misalignments, aging of
the damper, etc. A suggested safety factor is 0.80 (or 80% of the rated torque).

See AB-300 Damper Actuator Sizing and Selection Application Bulletin in the HVAC

Systems/Controls Reference Data (125-1853) for additional sizing information. See
TB-181 Powers™ Controls Maximum Thrust Ratings of Pneumatic Damper Actuators
Technical Bulletin (155-219P25) for additional torque requirements.

Table 2. Thrust and Torque Rating.

Nominal

Spring
Range

3-8 psi

(21-55 kPa)

3-13 psi

15psi

(103 kPa)

125 (556) 179 (796) 304

36 (160) 89 (396) 214 (952) 54 (240) 50 (5.6) 75 (8.5) 75 (8.5) 75 (8.5)

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

Full Stroke Forward 2-Position Operation

Spring
Return

18 psi

(124 kPa)

25 psi

(172 kPa)

(No Stroke)

0 psi (0 kPa)

54 (240) 50 (5.6) 75 (8.5) 75 (8.5) 75 (8.5)

(1352)

(21-90 kPa)

8-13 psi

36 (160) 89 (396) 214 (952) 144 (640) 50 (5.6) 202 (22.8) 202 (22.8) 202 (22.8)

(55-90 kPa)

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

2

) from the damper manufacturer.

Gradual

Operation

15 psi

(103 kPa)

or Positioner

18 psi

(124 kPa)

25 psi

(172 kPa)

Page 4 Siemens Building Technologies, Inc.