Chamberlain MotorLift ML500, Instruction Manual

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Connect Door Arm to Trolley
A. Preferred Installation:
Disconnect Trolley by pulling on the red handle and slide towards door. With door closed connect Straight Door
Arm (5) to Trolley (4) with Bolt (3), secure with Nut (1). Connect Curved Door Arm (2) to Door Bracket with Bolt (3)
Secure with Nut (1). Align Straight and Curved Door Arms with a 2 hole overlap connect with Bolt (3), secure with
Nut (1), If Straight Door Arm (5) is too long, cut the end of the Door Arm.
B. Where extra travel distance is required:
With door closed connect Curved Door Arm (2) to Door Bracket with Bolt (3), secure with Nut (1). Lift Curved Door
Arm (2) to meet Trolley, connect door arm to Trolley with Bolt (3), secure with Nut (1).
Connect Electric Power
To avoid installation difficulties, do not run the garage door opener until instructed to do so.
Plug the opener into electric outlets as specified by local wiring codes. The opener light will turn on when power is
connected and remain on for 2-1/2 minutes.
Attach Limit Switches
NOTE: The limits must be installed as shown. If installed incorrectly the unit will not function properly.
Close garage door by hand. Determine the position of the Close Limit Switch (1) (Long wire) by aligning the center of
trolley and the center of the Limit Switch. The Limit Switches are actuated by a magnet in the Inner Trolley.
Insert bottom tab (5) of Limit Switch (1) into bottom lip of Rail (7). Insert top tab (4) under top lip of Rail (6). Lift limit
assembly against top lip of Rail and tighten screw (8) to secure Close Limit Switch.
Open garage door by hand to the full open position. Pull red handle to open door past Inner Trolley. Determine the
position of the Open Limit Switch (3) (Short Wire) by aligning the center of the Trolley and the center of the Limit Switch.
Insert bottom tab (5) of Limit Switch (1) into bottom lip of rail (7). Insert top tab (4) under top lip of rail (6). Lift limit
assembly against top lip of rail and tighten screw (8) to secure Open Limit Switch.
Insert wires for Limit Switch (9) into top channel of Rail (10). Secure wires with wire clip. the wires must be secured so
they do not interfere with the travel of the Trolley. Activate remote, the opener will operate and reconnect to the door
automatically.
Run opener 2 full travel cycles. If the door reverses in mid travel go to Setting the Force Section. Adjust Limit Switches
as necessary to fully open and close the door without reversing.