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Technical Instructions

Document No. 155-136P25

EA 338-1

December 1, 2008

EA 338 Electronic Actuator

Siemens Industry, Inc.

Description

The EA 338 Electronic Actuators are used with floor mount linkage kits to operate

dampers in HVAC installations. These actuators will accept a modulating voltage signal

input from an electronic controller.

Features

• 24 Vac power supply.

• Field adjustable input signal range (0 to 10 Vdc start, 3 to 16 Vdc span) for 160°

stroke on modulating models.

• Oil-immersed gear train for reliable performance and long life.

• Die-cast magnesium housing.

• Wiring box provides NEMA 3 protection.

• UL Listed and CSA Certified.

Product Numbers

Table 1.

Description Torque Rating

in-lb (Nm)

Product Number

Modulating Actuators

Non-spring return

75 (8.5)

338-012

300 (34)

338-014

*Actuator, mounting kit, and push rod are all supplied separately. Be sure to order the correct parts for the

installation.

Application

The EA 338 Electronic Actuators are used for HVAC dampers requiring up to 300 lb-in

(34 Nm) of torque for operation. The actuators may be mounted by using the floor mount

kit. The actuators may be used on dampers at ambient temperatures between 0°F and

120°F (-18°C and 49°C).

Summary of content (12 pages)

PAGE 1
Technical Instructions Document No. 155-136P25 EA 338-1 December 1, 2008 PowersTM Controls EA 338 Electronic Actuator Description The EA 338 Electronic Actuators are used with floor mount linkage kits to operate dampers in HVAC installations. These actuators will accept a modulating voltage signal input from an electronic controller. Features • 24 Vac power supply. • Field adjustable input signal range (0 to 10 Vdc start, 3 to 16 Vdc span) for 160° stroke on modulating models.
PAGE 2
Technical Instructions Document Number 155-136P25 December 1, 2008 Specifications Power Supply Function Ambient Conditions EA 338 Electronic Actuator Power supply Frequency Power consumption lnput signal lmpedance Stroke Position resolution (modulating 160° stroke) Torque Running time 160° stroke Non-spring return 75 in-lb @ 60 Hz @ 50 Hz Running time 160° stroke Non-spring return 300 in-lb @ 60 Hz @ 50 Hz Maximum axial load Power end Auxiliary end Ambient temperature Transport and storage Operation Am
PAGE 3
EA 338 Electronic Actuator Technical Instructions Document Number 155-136P25 December 1, 2008 Accessories 338-031 Floor Mount Kit Damper Push Rods (5/16 inches diameter) 12 inches (304.8 mm) long 338-041 15 inches (381.0 mm) long 338-042 18 inches (457.2 mm) long 338-043 24 inches (609.6 mm) long 338-044 36 inches (914.4 mm) long 338-045 48 inches (1219.
PAGE 4
Technical Instructions Document Number 155-136P25 December 1, 2008 Mounting Instructions EA 338 Electronic Actuator • Always install the actuator with the main shaft in a horizontal position. See Figure 1. • Install the actuator with at least a 6-inch clearance above the housing cover to allow for wiring and interior access. General CAUTION: The actuator crank arm must be able to complete its full electrical stroke without striking the duct, floor or mounting bracket. Figure 1.
PAGE 5
EA 338 Electronic Actuator Mounting Instructions, continued Technical Instructions Document Number 155-136P25 December 1, 2008 • Do not mount the actuator in environments containing highly acidic or explosive fumes. In excessive salt environments, all mounting hardware should be zinc or cadmium plated. Figure 2. Floor Mounting. Installation The actuator is shipped with a minimum stroke of 80°. External Floor Mounting (Kit 338-031) 1.
PAGE 6
Technical Instructions Document Number 155-136P25 December 1, 2008 Installation, Continued EA 338 Electronic Actuator 5. Attach the other ball joint in the actuator crank arm slot as close to the actuator shaft opening as possible. 6. Drive the actuator to its mid-stroke position with the control signal. 7. Assemble the actuator crank arm to the actuator shaft at midstroke position. The crank arm must be flush with the shoulder of the shaft for correct installation. See Figure 4.
PAGE 7
EA 338 Electronic Actuator Installation Continued Technical Instructions Document Number 155-136P25 December 1, 2008 8. Tighten both ball joints to the crank arms. 9. Slide the push rod through the two ball joints. Verify that the push rod is parallel to the duct wall. See Figure 2. With a wrench, slightly tighten the setscrews which secure the push rod. 10. Proceed to Adjusting the Linkage section. Figure 5. Internal Floor Mounting. Internal Floor Mounting 1.
PAGE 8
Technical Instructions Document Number 155-136P25 December 1, 2008 Adjusting the Linkage EA 338 Electronic Actuator NOTE: Adjustment of the crank arms must be made at mid-point of actuator stroke. 1. Loosen the tension screw on the actuator crank arm and slide the actuator crank arm off the shaft. 2. Position the damper as if the actuator were at midstroke. See position 2 in Figures 6 and 7.
PAGE 9
EA 338 Electronic Actuator Adjusting the Linkage, Continued Technical Instructions Document Number 155-136P25 December 1, 2008 CAUTION: Make sure that the electronic circuit shuts off the actuator. Do not allow the linkage to stall the actuator. 9. Tighten all nuts and screws securely. Figure 8. Repositioning Crank Arm in the Crank Hub. Wiring Diagrams Figure 9. Proper Location for the Push-on Clip. WARNING: All electrical circuits must be Class 2 rated.
PAGE 10
Technical Instructions Document Number 155-136P25 December 1, 2008 Start Up Modulating Actuators EA 338 Electronic Actuator Actuators, as shipped from the factory, accept a 0 to 10 Vdc control signal. To adjust the input signal span (Figure 10): 1. Begin with the Start and Span potentiometers in the fully counterclockwise position (Start=0, Span=0). 2. Apply the minimum control signal voltage across terminals Y and M.
PAGE 11
EA 338 Electronic Actuator Technical Instructions Document Number 155-136P25 December 1, 2008 Dimensions Figure 11. Dimensions of the Mounting Bracket. Figure 12. Damper Crank Arm. Siemens Industry, Inc.
PAGE 12
Technical Instructions Document Number 155-136P25 December 1, 2008 EA 338 Electronic Actuator Dimensions, Continued Figure 13. Dimensions of the Actuator in Inches (Millimeters). Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Powers and APOGEE are registered trademarks of Siemens Industry, Inc.