Chamberlain C870 C870 Owner s Manual - English - Page 12

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). HARDWARE WALL INSTALLATION Wall Mounting Holes 2x4 Structural Support Lag Screw 5/16"-9x1-5/8" UP Horizontal Line 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. Drill 3/16" pilot holes and fasten the bracket securely to a structural support with the hardware provided. 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 away from 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. Optional Mounting Holes Highest Point of Garage Door Travel CEILING INSTALLATION Header Bracket Ceiling Mounting Holes 6" (15 cm) Maximum Door Spring UP Header Wall Header Bracket Garage Door Vertical Centerline of Garage Door Lag Screw Door Spring Garage Door Finished Ceiling Vertical Centerline of Garage Door Lag Screw Header Wall 12