LiftMaster 8550 8550 Manual - Page 18

Install the Protector System® 1 Install the Safety Reversing Sensors The safety reversing sensors can be attached to the door track, the wall, or the floor. If the door track will not support the sensor bracket a wall installation is recommended. Choose one of the following installations. HARDWARE H12 (2) Carriage Bolt 1/4"-20x1/2" OPTION A DOOR TRACK INSTALLATION 1.1A Slide the curved arms of the sensor bracket around the edge of the door track. Snap into place so that the sensor bracket is flush against the track. 1.2A Slide the carriage bolt (H12) into the slot on each sensor. 1.3A Insert the bolt through the hole in the sensor bracket and attach with the wing nut (H13). The lenses on both sensors should point toward each other. Make sure the lens is not obstructed by the sensor bracket. H13 (2) Wing Nut 1/4"-20 H13 H12 OPTION B WALL INSTALLATION If additional clearance is needed an extension bracket (not provided) or wood blocks can be used. Make sure each bracket has the same amount of clearance so they will align correctly. 1.1B Position the sensor bracket against the wall with the curved arms facing the door. Make sure there is enough clearance for the beam to be unobstructed. Mark holes. 1.2B Drill 3/16 inch pilot holes for each sensor bracket and attach the sensor brackets to the wall using lag screws (not provided). 1.3B Slide the carriage bolt (H12) into the slot on each sensor. 1.4B Insert the bolt through the hole in the sensor bracket and attach with the wing nut (H13). The lenses on both sensors should point toward each other. Make sure the lens is not obstructed by the sensor bracket. (not provided) IGWnasairldal ege (not provided) H13 H12 Lens 18