Chamberlain 8500 Manual page 15

Installation
MOUNTING THE SAFETY REVERSING SENSORS
1. Slide a hex screw 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.
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/
WHT
BLK
Wing nut
6" (15 cm) max.
Bell wire
15
HARDWARE
Hex Screw 10-24 (2)
Wing Nut (2)