Chamberlain 8500W Installation 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.
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.
7/16
(11 mm)
WHT/
BLK
WHT
Bell wire
Carriage Bolt
16
HARDWARE
Carriage Bolt
1/4"-20x1/2" (2)
Wing Nut
1/4"-20 (2)