Product Overview

www.usa.siemens.com/hvac
Damper Actuators
E-35
331-4314Actuatorwithxed
mounting bracket and clevis.
331-4312 Actuator with pivot
mounting bracket.
331-4311 Actuator, clevis and rocker arm.
Mounting for extended shaft.
Description
Designedwitha2-3/8-inch(60mm)stroke,theNo.3
Pneumatic Actuator is a rugged, metal-fabricated device
that provides gradual or positive actuation of HVAC dampers.
The actuator is available in a variety of spring ranges for
energy optimizing and sequencing with other devices.
Features
• Ozone-resistantrollingrubberdiaphragm
• Varietyofinstallationoptions,including:
 –Fixedbracketmounting
– Direct front mounting
– Pivot mounting for extended shaft
• Availablewithpositioningrelay
Applications
Recommended for control of mixing box dampers or
air valves and damper control for unit ventilators, unit
conditioners and small HVAC systems. The No. 3
PneumaticActuatorisalsoavailablewith2-3/4-inch
(70 mm) stroke in the three spring ranges.
Formoreinformation,contactyourlocalSiemensBuilding
Technologies representative.
No. 3 Pneumatic Actuator
331
Nominal
Spring
Rating
Max. Thrust lb. (N) Torque Rating lb.-in (Nm)
Full Stroke Forward
Spring
Return
(No Stroke)
0 psi
(0 kPa)
Gradual
Operation
2-position Operation
or with Positioner
15 psi
(103 kPa)
18 psi
(124 kPa)
25 psi
(172 kPa)
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.