Chamberlain B550 B550 B552 B750 Owner s Manual - English - Page 17

Installation STEP 8 Install the door bracket Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Contact the garage door manufacturer or installing dealer for opener reinforcement instructions or reinforcement kit. Failure to reinforce the top section as required according to the door manufacturer may void the door warranty. A horizontal and vertical reinforcement is needed for lightweight garage doors (fiberglass, aluminum, steel, doors with glass panel, etc.) (not provided). A horizontal reinforcement brace should be long enough to be secured to two or three vertical supports. A vertical reinforcement brace should cover the height of the top panel. Contact the garage door manufacturer or installing dealer for opener reinforcement instructions or reinforcement kit. NOTE: Many door reinforcement kits provide for direct attachment of the clevis pin and door arm. In this case you will not need the door bracket; proceed to the next step. OPTION A - SECTIONAL DOORS 1. Center the door bracket on the previously marked vertical centerline used for the header bracket installation. Note correct UP placement, as stamped inside the bracket. 2. Position the top edge of the bracket 2"-4" (5-10 cm) below the top edge of the door, OR directly below any structural support across the top of the door. 3. Mark, drill holes and install as follows, depending on your door's construction. Metal or light weight doors using a vertical angle iron brace between the door panel support and the door bracket: l Drill 3/16" fastening holes. Secure the door bracket using the two 1/4"-14x5/8" self-threading screws. (Figure 1) l Alternately, use two 5/16"-18x2" bolts, lock washers and nuts (not provided). (Figure 2) Metal, insulated or light weight factory reinforced doors: l Drill 3/16" fastening holes. Secure the door bracket using the self-threading screws. (Figure 3) Wood doors: l Use top and bottom or side to side door bracket holes. Drill 5/16" holes through the door and secure bracket with 5/16"-18x2" carriage bolts, lock washers and nuts (not provided). (Figure 4) NOTE: The 1/4"-14x5/8" self-threading screws are not intended for use on wood doors. HARDWARE Self-Threading Screw 1/4"-14x5/8" Horizontal Reinforcement Vertical Reinforcement FIGURE 1 Door Bracket Self-Threading Screw FIGURE 3 Vertical Reinforcement Vertical Centerline of Garage Door FIGURE 2 UP Hardware (not provided) Vertical Centerline of Garage Door FIGURE 4 Hardware (not provided) UP Vertical Reinforcement Vertical Centerline of Garage Door Door Bracket UP Inside Edge of Door or Reinforcement Board UP Self-Threading Screw Vertical Centerline of Garage Door 17