LiftMaster ATSW Mode D'emploi page 11

Installation
2 Install the Header Bracket
You can attach the header bracket either to the wall above the door, or to the ceiling. Follow the instructions which will
work best for your particular requirements. Do not install the header bracket over drywall. If installing into
masonry, use concrete anchors (not provided).
Lag Screw 5/16"-9x1-5/8"
OPTION A - WALL INSTALLATION
1. Center the bracket on the vertical centerline with the bottom edge of the bracket on the horizontal line as
shown (with the arrow pointing toward the ceiling).
2. Mark the vertical set of bracket holes (do not use the holes designated for ceiling mount). Drill 3/16" pilot
holes and fasten the bracket securely to a structural support with lag screws.
Wall Mount
2x4 Structural
Support
Horizontal
Line
Optional
Highest Point of
Mounting
Garage Door
Holes
Travel
HARDWARE
(Header Wall)
Vertical
Centerline of
Garage Door
Header
Bracket
(Garage Door)
OPTION B - CEILING INSTALLATION
1. Extend the vertical centerline onto the ceiling as shown.
2. Center the bracket on the vertical mark, no more than 6" (15 cm) from the wall. Make sure the arrow is
pointing toward the wall. The bracket can be mounted flush against the ceiling when clearance is minimal.
3. Mark the side holes. Drill 3/16" pilot holes and fasten bracket securely to a structural support with the
hardware provided.
Ceiling Mounting Holes
Lag Screw
5/16"-9 x 1-5/8"
Door Spring
11
Header
(Finished Ceiling)
Bracket
6" (15 cm)
Maximum
Door Spring
(Garage Door)
Vertical
Centerline of
Garage Door
Lag Screw
5/16"-9 x 1-5/8"
(Header Wall)