LiftMaster 8587W 8550W Users Guide Manual - Page 10

Operation The Protector System® (Safety Reversing Sensors) Be sure power is NOT connected to the garage door opener BEFORE installing the safety reversing sensor. To prevent SERIOUS INJURY or DEATH from closing garage door: • Correctly connect and align the safety reversing sensor. This required safety device MUST NOT be disabled. • Install the safety reversing sensor so beam is NO HIGHER than 6" (15 cm) above garage floor. The safety reversing sensors must be connected and aligned correctly before the garage door opener will move in the down direction. When the light beam is obstructed or misaligned while the door is closing, the door will reverse and the garage door opener lights will flash ten times. If the door is already open, it will not close. The sensors can be aligned by loosening the wing nuts, aligning the sensors, and tightening the wing nuts. Check to make sure the LEDs in both sensors are glowing steadily. The LEDs in both sensors will glow steadily if they are aligned and wired correctly. Amber LED Safety Reversing Sensor 6" (15 cm) max. above floor (invisible light beam) Green LED Safety Reversing Sensor 6" (15 cm) max. above floor 10 For the complete manual visit LiftMaster.com/Customer-Support