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Chamberlain HD420EV Manual

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Installation
STEP 8 Install the door bracket
Fiberglass, aluminum or lightweight steel garage doors WILLREQUIRE reinforcement BEFORE
installation of door bracket. Contact your door manufacturer for reinforcement kit.
Figure 1 showsone piece of angle iron as the horizontal brace. For the vertical brace,2 pieces ofangle
iron are used to create a U-shaped support. The bestsolution is to checkwith 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 the next step.
A horizontal and vertical reinforcementis needed for
li
ghtweight garage doors (fi
berglass, 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.
FIGURE 1
Self-Threading Screw
1/4"-14x5/8"
HARDWARE
OPTION A SECTIONALDOORS
1. Center the door bracket on the previouslymarked vertical centerline used for the header
bracketinstallation. Note correctUP placement, asstamped inside the bracket.
2. Position the top edge ofthe bracket 2"-4" (5-10 cm) below the top edge ofthe door, OR
directlybelow 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:
• Drill 3/16" fastening holes. Secure the door bracket using the two self threading screws.
(Figure 2)
• Alternately,use two 5/16" bolts,lock washers and nuts (not provided).(Figure 3)
Metal, insulated or light weight factory reinforced doors:
• Drill 3/16" fastening holes. Secure the door bracket using the self-threading screws.
(Figure 4)
Wood Doors:
• Use top and bottom or side to side door bracket holes.Drill 5/16" holes through the door and
secure bracketwith 5/16"x2" carriage bolts,lock washers and nuts (notprovided). (Figure 5)
NOTE: The 1/4"-14x5/8" self-threading screws are not intended for use on wood doors.
FIGURE 2
FIGURE 4
FIGURE 5
FIGURE 3
Vertical
Reinforcement
Vertical Centerline
of Garage Door
UP
Door Bracket
Vertical Reinforcement
Vertical Centerline
of Garage Door
Bolt 5/16"-18x2"
(not provided)
Lock Washer 5/16"
Nut 5/16"-18
Door Bracket
UP
Vertical
Centerline
of Garage
Door
UP
Vertical Centerline of
Garage Door
Bolt 5/16"-18x2"
(not provided)
UP
Inside Edge of Door or
Reinforcement Board
Self-Threading Screw
1/4"-14x5/8"
Self-Threading
Screw
1/4"-14x5/8"
… 17 …


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