Chamberlain HD220 Owner's Manual page 23

Installation
STEP 14 Wire the Safety Reversing Sensors
If your garage already has wires installed for the safety reversing sensors, proceed to page 23.
OPTION A
INSTALLATION WITHOUT PRE-WIRING
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.
HARDWARE
Insulated Staple
(Not Shown)
1
Staple
3
22
2
7/16" (11 mm)