LiftMaster 3850 3850 Elite Series Manual - Page 4

Planning Identify the type and height of your garage door. Survey your garage area to see if any of the conditions below apply to your installation. Additional materials may be required. You may find it helpful to refer back to this page and the accompanying illustrations as you proceed with the installation of your opener. SECTIONAL DOOR INSTALLATION Horizontal and vertical reinforcement is needed for lightweight garage doors (fiberglass, steel, aluminum, door with glass panels, etc.). See page 19 for details. Header Wall FINISHED CEILING Support bracket & fastening hardware is required. See page 12. Torsion Spring Extension Spring OR Motor Unit --- --- -- Vertical Centerline of Door Access Door Wallmounted Door Control Safety Gap between floor and bottom Reversing Sensor Safety of door must not exceed 1/4" (6 mm) Reversing Sensor ONE-PIECE DOOR WITHOUT TRACK FINISHED CEILING Support bracket & fastening hardware is required. See page 12. Motor Unit Header Wall ONE-PIECE DOOR WITH TRACK Wallmounted Door Control Access Door Access Door Safety Reversing Sensor Gap between floor and bottom of Safety door must not exceed 1/4" (6 mm) Reversing Sensor 4 Safety Reversing Sensor Gap between floor and bottom of door must not exceed 1/4" (6 mm). Safety Reversing Sensor