LiftMaster ATSW Mode D'emploi page 10

Installation
1 Determine the Header Bracket Location
To prevent possible SERIOUS INJURY or DEATH:
Header bracket MUST be RIGIDLY fastened to structural support on header wall or ceiling, otherwise door
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might NOT reverse when required. DO NOT install header bracket over drywall.
Concrete anchors MUST be used if mounting header bracket or 2x4 into masonry.
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NEVER try to loosen, move or adjust door, springs, cables, pulleys, brackets, or their hardware, ALL of
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which are under EXTREME tension.
ALWAYS call a trained door systems technician if door binds, sticks, or is out of balance. An unbalanced
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door might NOT reverse when required.
DO NOT enable the Timer-to-Close functionality if operating either one-piece or swinging doors. To be
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enabled ONLY when operating a sectional door.
Close the door and mark the inside vertical centerline of the door.
Extend the line onto the header wall above the door. You can fasten the header bracket within 4 feet (1.22 m) of the
left or right of the door center only if a torsion spring or center bearing plate is in the way; or you can attach it to the
ceiling when clearance is minimal. (It may be mounted on the wall upside down if necessary, to gain approximately
1/2" (1 cm). If you need to install the header bracket on a 2x4 (on wall or ceiling), use lag screws (not provided) to
securely fasten the 2x4 to structural supports.
Open your door to the highest point of travel as shown. Draw an intersecting horizontal line on the header wall 2" (5
cm) above the high point. This height will provide travel clearance for the top edge of the door.
NOTE: If the total number of inches exceeds the height available in your building, use the maximum height possible,
or refer to page 11 for ceiling installation.
Unfinished
Ceiling
Header Wall
Vertical Centerline
of Garage Door
Level
(Optional)
10
OPTIONAL
CEILING
MOUNT FOR
HEADER
BRACKET
2x4
Structural
2x4
Supports
Header Wall
2" (5 cm)
Track
Highest Point
of Travel
Door
Sectional door with curved track