LiftMaster 8500W Owners Manual - Page 16

Installation MOUNTING THE SAFETY REVERSING SENSORS 1. Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor. 2. Use wing nuts to fasten safety reversing sensors to brackets, with lenses pointing toward each other across the door. Be sure the lens is not obstructed by a bracket extension. 3. Finger tighten the wing nuts. HARDWARE Carriage Bolt 1/4"-20x1/2" (2) Wing Nut 1/4"-20 (2) Carriage Bolt Wing Nut WIRE THE SAFETY REVERSING SENSORS 1. Run the wire from both sensors to the garage door opener. Attach the wire to the wall and ceiling with the staples. 2. Strip 7/16 inch (11 mm) of insulation from each set of wires. Separate the wires. Twist the white wires together. Twist the white/black wires together. 3. Insert the white wires into the white terminal on the garage door opener. Insert the white/black wires into the grey terminal on the garage door opener. To insert or remove the wires from the terminal, push in the tab with a screwdriver tip. WHT 7/16 (11 mm) WHT/ BLK Bell wire 16