LiftMaster APT APT LOGIC 3 Manual - Page 7

I N S TA L L AT I O N HANG THE OPERATOR 1. The illustration below shows a typical method of hanging the operator from the ceiling. Each installation may vary, but in all cases side braces should be used for additional strength. 2. For mounting of the support brace(s) to the powerhead. Four holes (clearance up to 3/8" bolts) are located on each side of frame. 3. Check to make sure the track is centered over the door (or in line with the header bracket if the bracket is not centered above the door). NOTE: If the operator is longer than 15' (4.57 m) use of a mid-span support is recommended. WARNING To avoid possible SERIOUS INJURY from a falling operator, CAUTION fasten it SECURELY to structural supports of the garage. Concrete anchors MUST be used if installing ANY brackets into masonry. STRAIGHT ARM ATTACHMENT 1. Fully close the door and move the trolley slider to within 2" (5.08 cm) of the front idler. 2. Attach straight door arm to the fixed roll pin in the trolley carriage. 3. Attach the door bracket to the door arm using the 3/8"-16 x 1" bolt and nylon locking nut provided. Leave the nut and bolt loose enough to allow the two pieces to pivot freely. 4. Using 3/8" hardware provided, bolt the curved door arm to the straight arm, aligning the mounting holes in such a way that the door bracket pivot bolt will be in line with the top rollers on the door. 5. Position the door bracket to the center line on the door. Using suitable hardware, attach the door bracket to the door. Many installations, except solid wood doors, will require additional support for the door. Refer to the illustration below. NOTE: At this time, ensure all bolts and lag screws are properly secured. Top Roller Mid-Span Support Brace Powerhead Support Brace Curved Door Arm Straight Arm Vertical Centerline of Door Door Bracket Pivot Bolt 7