LiftMaster 3255 3255 Manual - Page 9

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"-9x1-5/8" 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. Ceiling Mounting Holes CEILING MOUNT ONLY UP The nail hole is for positioning only. You must use lag screws to mount the header bracket. Wall Mounting Holes CEILING MOUNT ONLY UP The nail hole is for positioning only. You must use lag screws to mount the header bracket. Optional Wall Mounting Holes Header Wall 2x4 Structural Support Header Bracket CEILING MOUNT ONLY UP Vertical Centerline of Garage Door Lag Screws 5/16"-9x1-5/8" Door Spring Horizontal Line Highest Point of Garage Door Travel Garage Door Vertical Centerline of Garage Door 6" (15 cm) Maximum Door Spring - Finished Ceiling - Header Bracket Vertical Centerline of Garage Door UP Lag Screws 5/16"-9x1-5/8" Garage Door Header Wall Vertical Centerline of Garage Door 9