LiftMaster LJ8950W LJ8950W Manual - Page 3

Introduction Preparing Your Door BEFORE YOU BEGIN: • Remove any ropes connected to door. • Raise and lower the door to ensure the door does not bind or stick and is properly balanced. If your door binds, sticks or is out of balance refer to the door manufacturer for more information. Doors heavier than 650 lbs. should NOT open or fall rapidly. For live shaft type doors the drive shaft needs to extend 1-1/2" beyond the door mount bracket. • If the operator is mounted below 8 ft. (2.5 m), a chain guard must be installed to protect against possible injury. See accessories page. To prevent possible SERIOUS INJURY or DEATH: • ALWAYS call a trained door systems technician if door binds, sticks or is out of balance. An unbalanced door may NOT reverse when required. • NEVER try to loosen, move or adjust door, door springs, cables, pulleys, brackets or their hardware, ALL of which are under EXTREME tension. • Disable ALL locks and remove ALL ropes connected to door BEFORE installing and operating door operator to avoid entanglement. • DO NOT install operator below 6 feet (1.83 m). To prevent damage to door and operator: • ALWAYS disable locks BEFORE installing and operating the operator. • ONLY operate door operator at 120V, 60 Hz to avoid malfunction and damage. • DO NOT exceed 10 complete cycles of door operation per hour. • DO NOT run operator if the door is locked. • Chain guard to be installed where the drive chain is exposed lower than 8 feet (2.5 m). SPECIFICATIONS Volts 120 Vac - 60 Hz, ONLY Current 1.5 AMP Rated Load 385 in. lb./sec. 10 Cycles per Hour Maximum Door Height 12 ft. Maximum Door Size 14 ft. x 12 ft. (not to exceed 168 sq./ft.) 3