Installing The Norton LEO™ 5700

This low energy operator is mounted onto a pair of doors at a new building's main entrance.


I was invited to the installation of a Norton LEO™ power door operator and door operator switch onto the right hand door of a pair of doors in the main entrance of a newly constructed building. Access through these doors is controlled using Yale rim exit devices with keyed dogging, and latching...


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Step 8. Remove the two screws from the top left and right side of the closer body. These screw holes will provide double duty, not only keeping the closer body attached to the backplate, but also helping to secure the LEO onto the jamb.

Step 9. Place a level against the backplate to level the LEO.

Step 10. Mark the location of the two openings in the closer body and the two other mounting holes on the left side of the backplate.

Step 11. Drill and tap the holes for #1/4-20 screws.

Step 12. Install the four #1/4-20 Phillips head screws.

Step 13. Install the main arm onto the pinion shaft at a 90-degree angle to the door jamb using a #1/4-20 flange head screw. There is only one position to install the main arm as there is a pinion flat on the closer shaft.

Step 14. Mount the shoe/adjusting rod onto the door using two 1/4-20 hex head screws.

Step 15. Slide the adjusting rod into the arm slide. Preload the arm by rotating the spindle shaft until the arm slide is at a 90-degree angle from the face of the door jamb. Once pre-loaded, install the forearm screw and secure the arm.

The next series of steps is to adjust the mechanical operation of the closer. We begin with adjusting the spring power of the closer. The spring power adjustment controls the amount of force that is exerted onto the door when opening and closing.

Step 16. Adjust the spring power to properly close the 36" wide door. The adjustment is done using a 1/8" hex wrench. Clockwise rotation increases power. Test operation of the closer. Use a gauge to make sure the closer operates according to the appropriate guidelines that indicate door closer force must not exceed five pounds when closing. Once the closer operates properly, continue with the sweep, latch, and backcheck adjustments.

The sweep adjustment controls the swing of the door from approximately 90 degrees to 10-15 degrees. The A.D.A. requires that from an open position of 70 degrees, the door must take at least three seconds to move to a point three inches from the latched position, measured at the leading edge of the door. A decision was made to set the sweep speed at approximately five to six seconds.

Step 17. Adjust the sweep speed to be approximately five to six seconds. Slower closing is clockwise rotation. Faster closing is counterclockwise rotation. Check operation of the closer.

The latching adjustment controls the swing of the door from approximately 10-15 degrees to latching. Too slow and the door will not completely latch. Too fast and the door will slam closed.

Step 18. Adjust the latching speed to about two to three seconds. Slower latching is clockwise rotation. Faster latching is counterclockwise rotation. Check operation of the closer.

The backcheck adjustment limits opening forces of manual operation, by slowing down the intensity at which the door can be opened. Proper adjustment avoids damage to the closer and operator. The backcheck adjustment should never take the place of a supplemental door stop.

Step 19. Adjust the backcheck to slow the doors opening movement as it reaches maximum opening. Check operation of the closer.

The LEO is factory adjusted prior to shipping. Test the power opening operation, following steps one through four.

Step 1. Turn off the circuit breaker and make the wiring connections of ground, common, and hot.

Step 2. Turn on the circuit breaker.

Step 3. Turn the power unit on and turn the breaker switch adjacent to the closer to "RESET".

Step 4. Use a jumper wire to jump terminal one and two to activate the opening procedure. Observe the operation of the low energy operator. If the LEO opens and closes smoothly, skip steps five through 13. Note: For this installation, there was no need to make any adjustments to the clutch or position rings.

Step 5. Jump terminals one and two to activate the operator's opening procedure.

Step 6. When the door reaches 20° open, turn the breaker switch to "OFF". Allow the door to close.

Step 7. Push the door open slightly and insert the 1/8" hex wrench into the clutch assembly to create a small gap between the two clutch components.

Step 8. Close the door and remove the hex wrench.

The Closing Position Ring Assembly position must be set to ensure the operator stop when the door closes.

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