Chamberlain 3275C Fasten the Door Bracket, NOTE:, NOTE:, Figure, Figure, Figure, Figure 2B, Figure 2A, Wood Doors:, SECTIONAL DOORS

INSTALLATION STEP 11

Fasten the Door Bracket

Follow instructions which apply to your door type as illustrated below or on the following page.

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.

Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit.

Figure 1 shows one piece of angle iron as the horizontal brace. For the vertical brace, 2 pieces of angle iron are used to create a U-shaped support. The best solution is to check with your garage door manufacturer for an opener installation door 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 Step 12.

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

Header

Bracket

Door

Bracket

Location

Vertical

Centerline

of Garage

Door

HORIZONTAL AND VERTICAL

REINFORCEMENT IS NEEDED

FOR LIGHTWEIGHT GARAGE DOORS (FIBERGLASS, ALUMINUM, STEEL, DOORS WITH GLASS PANEL, ETC.).

(NOT PROVIDED)

door’s construction:

Metal or light weight doors using a vertical angle iron brace between the door panel support and the door bracket:

•Drill 3/16" fastening holes. Secure the door bracket using the two 1/4"-14x5/8" self-threading screws (Figure 2A).

•Alternately, use two 5/16" bolts, lock washers and nuts (not provided) (Figure 2B).

Metal, insulated or light weight factory reinforced doors:

•Drill 3/16" fastening holes. Secure the door bracket using the self-threading screws (Figure 3).

Wood Doors:

•Use top and bottom or side to side door bracket holes. Drill 5/16" holes through the door and secure bracket with 5/16"x2" 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

SHOWN ACTUAL

SIZE

Self-Threading Screw 1/4"-14x5/8"

Figure 1

	Vertical
	(Not Provided) Reinforcement
Vertical		Vertical
Reinforcement		Centerline
		of Garage Door
Vertical	Bolt
Centerline
	5/16"-18x2"
of Garage Door
		UP
	Door
UP	Bracket
Door	Lock Washer
	5/16"	Nut
Bracket
		5/16"-18
Self-Threading
Screw		Figure 2B
1/4"-14x5/8"
Figure 2A
	(Not Provided)	Inside Edge
		of Door or
		Reinforcement Board
	Bolt
	5/16"x2"
		UP
Vertical
Centerline
of Garage Door	Vertical
UP	Centerline
	of Garage
	Door
Self-Threading		Figure 4
Screw
1/4"-14x5/8"

Figure 3

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