Installation Instructions

To adjust a normally closed ZC*** damper’s unpowered spring-return position:
1. Detach the spring from the motor bracket. Make note of the excess spring length below the bracket. This is important in setting the proper spring return force.
2. Loosen the set screw in the Outer Ring until the Outer Ring can freely rotate independent of the Inner Ring.
3. Rotate the plate to the intended closed position using the Inner Arm.
4. While maintaining the intended plate position, rotate the Outer Arm clockwise until it contacts the motor bracket.
5. Make sure that the Outer Ring is fully seated on the Inner Ring and tighten the set screw until it is ‘seated’. Do not overtighten the set screw.
Never use a powered drill driver.
6. Reattach the spring to the motor bracket. Ensure that the spring has the correct excess length as noted above.
To adjust a normally open ZO*** damper’s powered closed position:
1. Detach the spring from the motor bracket. Make note of the excess spring length below the bracket. This is important in setting the proper spring return force.
2. Loosen the set screw in the Outer Ring and remove.
3. Move the screw to the boss on the right side of the Outer Arm, but do not tighten fully.
4. Rotate the plate to the intended closed position using the Inner Arm.
5. While maintaining the intended plate position, rotate the Outer Arm counter-clockwise until it contacts the motor bracket.
6. Make sure that the Outer Ring is fully seated on the Inner Ring and tighten the set screw until it is ‘seated’. Do not overtighten the set screw.
Never use a powered drill driver.
7. Reattach the spring to the motor bracket. Ensure that the spring has the correct excess length as noted above.
To adjust a normally open ZO*** damper’s unpowered spring-return position:
1. Detach the spring from the motor bracket. Make note of the excess spring length below the bracket. This is important in setting the proper spring return force.
2. Loosen the set screw in the Outer Ring until the Outer Ring can freely rotate independent of the Inner Ring.
3. Rotate the plate to the intended open position using the Inner Arm.
4. While maintaining the intended plate position, rotate the Outer Arm clockwise until it contacts the motor bracket.
5. Make sure that the Outer Ring is fully seated on the Inner Ring and tighten the set screw until it is ‘seated’. Do not overtighten the set screw.
Never use a powered drill driver.
6. Reattach the spring to the motor bracket. Ensure that the spring has the correct excess length as noted above.
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SUNCOURT INC. 500 W. 2nd Ave • P.O. Box 40 • Durant, IA 52747-0040 • 1.800.999.FANS (3267) • www.suncourt.com
WNT165-24-0420-A04