LiftMaster 8550 8550 Manual - Page 20

Install the Protector System® OPTION B PRE-WIRED INSTALLATION 2.1B Cut the end of the safety reversing sensor wire, making sure there is enough wire to reach the pre-installed wires from the wall. 2.2B Separate the safety reversing sensor wires and strip 7/16 inch (11 mm) of insulation from each end. Choose two of the pre-installed wires and strip 7/16 inch (11 mm) of insulation from each end. Make sure that you choose the same color pre-installed wires for each sensor. Safety reversing sensor wires 7/16" Pre-installed wires (11 mm) 7/16" (11 mm) 2.3B Connect the pre-installed wires to the sensor wires with wire nuts making sure the colors correspond for each sensor. For example, the white wire would connect to the yellow wire and the white/black wire would connect to the purple wire. Not Provided White Yellow (for example) White/Black Safety reversing sensor wires Purple (for example) Pre-installed wires 2.4B At the garage door opener, strip 7/16 inch (11 mm) of insulation from each end of the wires previously chosen for the safety reversing sensors. Twist the like-colored wires together. 2.5B Insert the wires connected to the white safety sensor wires to the white terminal on the garage door opener. Insert the wires that are connected to the white/black safety sensor wires to the grey terminal on the garage door opener. Yellow Yellow (for example) Purple (for example) Purple RED WHITE WHITE GREY 7/16" (11 mm) To insert or remove the wires from the terminal, push in the tab with a screwdriver tip. 20