Greenheck 331-2976 Installation Manual
Technical Instructions
Document No. 152-012P25
September 12, 2003
Powers™ Controls
No. 4 Pneumatic Damper Actuator
Pivot Mount Actuator
with Clevis, Clevis Pin,
and Hitch Pin Clip
Description
Features
The No. 4 Pneumatic Damper Actuator is a totally enclosed pneumatic piston type
actuator designed to operate dampers for ventilating systems, mixing box control, and
other applications requiring a large effective diaphragm area and long stroke.
• All metal body modular construction
• Replaceable, ozone-resistant EPDM rubber rolling diaphragm
• Pivot mounting for extended shaft or frame mounting
• Fixed bracket mounting
• Direct front mounting
• Positioning relay (optional)
• Forward travel stops (optional)
• Adjustable hesitation point (hesitation actuator only)
Actuator with Fixed Bracket
Mounted
OEM Literature
Actuator with Universal Kit
Product Numbers
Application
See Table 1
The No. 4 Pneumatic Damper Actuator is recommended for control of outdoor, return air,
exhaust, face and bypass, fan discharge, and static pressure control dampers, as well as
specialized dampers and air valves found in terminal units such as unit ventilators and
mixing boxes.
The No. 4 Pneumatic Damper Actuator is frequently used to operate dampers for
fire/smoke control. These damper/actuator combinations have been tested to UL, AMCA,
and NFPA standards, and are on file at UL by the damper manufacturer.
Certain actuators in Table 1 are UL Recognized Components under UL’s
Damper Actuator category (EMKU2). This category covers pneumatic
damper actuators intended to be employed on fire dampers and fire/smoke
leakage rated dampers.
Siemens Building Technologies, Inc.
Technical Instructions Powers™ Controls No. 4 Pneumatic Damper Actuator
Document Number 152-012P25
September 12, 2003
Table 1. Product Numbers for No. 4 Pneumatic Damper Actuators.
Description
Actuator, three mounting screws,
Mounting Style
3-7 psi
(21-48 kPa)
Shaft end 331-2910 — 331-2917 331-2963
Part Number
Nominal Spring Range
3-13 psi
(21-90 kPa)
5-10 psi
(35-69 kPa)
8-13 psi
(55-90 kPa)
bracket no included
Actuator with fixed bracket mounted Shaft end 331-2911 — 331-2934 331-2966
Actuator, integral pivot, clevis, and
clevis pin for use with frame mounting
Pivot
331-2904*
331-2929
331-2905
331-2930
331-2906*
331-2931
331-2961*
331-2968
accessory
Actuator, integral pivot with pivot post
Universal kit 331-3000 331-3001 331-3002 331-2973*
mounted on plate for extended shaft
mounting with clevis and crank for
3/8, 7/16, or 1/2-inch (10, 11, or 13
mm) diameter shaft. Parts for frame
mounting (blade drive) included with
kit.
Contact Siemens OEM Sales for
details.
Any above with positioning relay
OEM specials — — 331-2976*
Positioner relays can be ordered for factory mounting on any of the above
331-2995*
331-2998*
actuators. To order an actuator with a factory-mounted positioner relay,
change the third digit in the actuator part number from a 1 to a 2. For example,
331-2961 becomes 332-2961 when ordered with a factory-mounted positioner
relay. You may also order the positioner relay separately from the actuator. Be
certain to order both the relay AND the mounting kit. See the Accessories
section for details.
* UL Recognized Component.
NOTE: When an actuator is ordered with universal mounting, the mounting plate, pivot post and hardware, clevis,
damper crank, and all screws/nuts are included. To order frame mounting accessories if not supplied by the
damper manufacturer, contact Siemens Building Technologies, Inc.
Specifications
Effective diaphragm area 11 inches2 (71 cm2)
Stroke 4 inches (102 mm)
Stroke (Hesitation model) 3 inches (76 mm)
Stem Stainless steel
Housing Steel with cathodic
epoxy electrocoat
Diaphragm EPDM rubber
Bearing Oilite® sintered bronze bushing in
aluminum die casting
Maximum Air Pressure 25 psig (172 kPa)
Nominal Spring Ranges 3 to 7 psi (21 to 50 kPa)
3 to 13 psi (21 to 90 kPa)
5 to 10 psi (35 to 70 kPa)
8 to 13 psi (55 to 90 kPa)
Nominal Spring Range (Hesitation model) 2 to 3; 8 to 13 psi
(14 to 21; 55 to 90 kPa)
Ambient temperature range Operating -20°F to 200°F (-29°C to 93°C)
Storage -20°F to 200°F (-29°C to 93°C)
Page 2 Siemens Building Technologies, Inc.
Powers™ Controls No. 4 Pneumatic Damper Actuator Technical Instructions
Document Number 152-012P25
September 12, 2003
Specifications,
Continued
Air Connection Elbow barb fitting for
1/4-inch OD plastic tubing
installed in 1/8-inch
NPT opening
Mounting Front, bracket, pivot
Thrust and Torque Rating See Table 2
Dimensions See Figures 7 through 11
Agency Approvals Complies with UL555 and
UL555S
NOTE: The No. 4 Pneumatic Damper Actuator does not require any periodic cycling. However, it is strongly
suggested that all systems are functionally checked periodically, and per local codes and ordinances.
Table 2. Thrust Torque Ratings.
Nominal
Spring
Range
3-7 psi
15 psi
(103 kPa)
88 (391) 121 (538) 198 (881) 33 (147) 30 (3.4) 46 (5.2) 46 (5.2) 46 (5.2)
Maximum Thrust lbs. (N) Torque Rating * lb-in (Nm)
Full Stroke Forward 2-position Operation or
Spring Return
(No stroke)
18 psi
(124 kPa)
25 psi
(172 kPa)
0 psig (0 kPa)
Gradual
Operation
15 psi
(103 kPa)
Positioner
18 psi
(124 kPa)
25 psi
(172 kPa)
(21-50 kPa)
3-13 psi
22 (98) 55 (245) 132 (587) 33 (147) 30 (3.4) 30 (3.4) 46 (5.2) 46 (5.2)
(21-90 kPa)
5-10 psi
55 (245) 88 (391) 165 (734) 55 (245) 30 (3.4) 77 (8.7) 77 (8.7) 77 (8.7)
(35-70 kPa)
8-13 psi
22 (98) 55 (245) 132 (587) 88 (391) 30 (3.4) 30 (3.4) 77 (8.7) 124 (14)
(55- 90 kPa
2-3, 8-13 psi
22 (98) 55 (245) 132 (587) 22 (98) 23 (2.6) — — —
(14-21, 55-90 kPa)
Hesitation model
* With maximum hysteresis of 2.5 psi (17.2 kPa) @ 90° rotation.
Accessories
Actuator shaft extensions:
11-7/8 inch extension kit, includes 5/16 inch
diameter rod, 1/4 - 28 ball joint connector, and
actuator shaft adapter 331-674
Actuator shaft extension kit, includes shaft/clevis
adapter, clevis adapter rod and nuts 333-030
Clevises:
OEM Stamped metal clevis (requires nut 041-143k) 333-191
Machined steel clevis 333-207
Cast metal (forged) clevis 331-653
Plastic clevis 331-801
Clevis Pins:
15/16-inch long 331-292
1-5/32 inch long 331-918
Hitch pin clip for preceding clevises 331-807
Siemens Building Technologies, Inc. Page 3
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