Install The Header Bracket - Chamberlain LiftMaster Professional SECURITY+ 3110C 1/3 HP Manuel Du Propriétaire

INSTALLATION STEP 2

Install the Header Bracket

You can attach the header bracket either to the wall
above the garage 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).
WALL HEADER BRACKET INSTALLATION
• 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).
• 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 the hardware provided.
HARDWARE SHOWN ACTUAL SIZE
Lag Screw
5/16"-9 x 1-5/8"
CEILING HEADER BRACKET INSTALLATION
• Extend the vertical centerline onto the ceiling as
shown.
• 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.
• Mark the side holes. Drill 3/16" pilot holes and
fasten bracket securely to a structural support with
the hardware provided.
The nail hole is for
positioning only.
You must use lag screws
to mount the header bracket.
Ceiling Mounting Holes
CEILING MOUNT ONLY
UP
9
Wall Mounting Holes
CEILING MOUNT ONLY
UP
Optional
Wall Mounting Holes
Header
Wall
2x4
Header
Structural
Bracket
Support
Horizontal
Line
Highest Point of
Garage Door Travel
Header
Bracket
6" (15 cm)
Maximum
Door
Spring
Garage Door
Vertical
Centerline
of Garage Door
The nail hole is for
positioning only.
You must use lag screws
to mount the header bracket.
Vertical
Centerline
of Garage Door
Lag Screws
5/16"-9x1-5/8"
Door Spring
Garage
Door
Vertical
Centerline
of Garage Door
— Finished Ceiling —
Vertical
Centerline
of Garage Door
Lag Screws
5/16"-9x1-5/8"
Header Wall