Short Damper Shafts

See Figure-13for installation of actuator using the AM-676 Universal Shaft Extension. Installation requires AM-676 Universal Shaft Extension and AM-753 Universal Mounting Clamps for 3/4" to 1" (19 to 25 mm) shafts, these items must be ordered separately.

1.Loosen the V-clamp nuts on the AM-676 universal shaft extension.

2.Fit the universal shaft extension fully onto the damper shaft. Tighten the universal shaft extension V-clamp nuts with a 10 mm open-end wrench. Apply 4 to 6 ft. lbs

(5 to 8 N-m) of torque.

3.Move the damper to its normal position. Verify the controller action is set to match the damper application. See TYPICAL APPLICATIONS (wiring diagrams).

–For normally closed damper: when damper is closed, actuator position indicator should be at 0°. When damper is open, actuator position indicator should be at 90°.

–For normally opened damper: when damper is open, actuator position indicator should be at 0°. When damper is closed, actuator position indicator should be at 90°.

4.Remove the mounting clamps from the actuator and replace them with the AM-753 universal mounting clamps.

5.Loosen the nuts on both of the AM-753 universal mounting clamps on the damper actuator.

–If the damper shaft rotates clockwise to the closed position, mount the actuator with the side marked “R” facing the installer. See Figure-10.

–If the damper shaft rotates counterclockwise to the closed position, mount the actuator with the side marked “L” facing the installer. See Figure-11.

6.Assemble the damper actuator onto the universal shaft extension, allowing the extension to slide through the actuator’s universal mounting clamps. Make sure the actuator is 90° (perpendicular) to the damper shaft. Then, hand tighten the nuts on both of the actuator’s universal mounting clamps. See Figure-12

Note: If the universal shaft extension protrudes excessively above the damper actuator's top universal mounting clamp:

•remove the damper actuator from the universal shaft extension,

•remove the extension from the damper shaft,

•shorten the universal shaft extension by cutting it to the desired length,

•then proceed to follow mounting instructions.

7.Slide the anti-rotation bracket pin into the mounting slot on the actuator. See Figure-12.For narrow spaces, the AM-752 anti-rotation bracket is recommended (order separately).

8.Position the actuator and bracket in the desired final mounting position on the mounting surface and drill mounting holes. See Figure-13.

9.Attach one side of the anti-rotation bracket to the mounting surface with one of the screws provided. Leave the screw loose so that the bracket can be rotated. See Figure-10for clockwise or Figure-11for counterclockwise spring return.

10.Pivot the anti-rotation bracket away from the actuator. See Figure-10or Figure-11.

11.Loosen the universal mounting clamps, making sure not to move the damper shaft. Rotate the actuator approximately 5° in the direction which would open the damper. See Figure-10or Figure-11.

12.Tighten all of the universal mounting clamp nuts with a 1/2" socket wrench. Apply 4 to 6 ft-lbs (5 to 8 N-m) of torque.

13.Manually rotate the actuator toward the full-closed position to apply pressure to the damper seals. See Figure-10or Figure-11.

14.Pivot the anti-rotation bracket into place and secure the other side of the bracket onto the mounting surface using the other screw provided with the actuator. See Figure-10or Figure-11.

15.Verify that the damper is in its full-closed position and actuator at 90° (perpendicular) to the damper shaft. See Figure-10or Figure-11.

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