Chamberlain Contractor Series Manual page 11

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
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wall or ceiling, otherwise garage door might NOT reverse when required. DO
NOT install header bracket over drywall.
Concrete anchors MUST be used if mounting header bracket or 2x4 into
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masonry.
NEVER try to loosen, move or adjust garage door, springs, cables, pulleys,
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brackets, or their hardware, ALL of which are under EXTREME tension.
ALWAYS call a trained door systems technician if garage door binds, sticks, or
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is out of balance. An unbalanced garage door might NOT reverse when
required.
DO NOT enable the Timer-to-Close functionality if operating either one-piece or
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swinging garage doors. To be enabled ONLY when operating a sectional door.
Close the door and mark the inside vertical centerline of the garage 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 garage, use the
maximum height possible, or refer to page 12 for ceiling installation.
Unfinished
Ceiling
Header Wall
Vertical Centerline
of Garage Door
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OPTIONAL
CEILING
MOUNT FOR
HEADER
BRACKET
2x4
Structural
2x4
Supports
Level
(Optional)
Header Wall
2" (5 cm)
Track
Highest Point
of Travel
Door
Sectional door with curved track