Chamberlain HD520EV User Manual

11
Installation
STEP 1 Determine the header bracket location
To preventpossible SERIOUS INJURY or DEATH:
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Header bracketMUSTbe RIGIDLY fastened to structural supporton header wall or ceiling,
otherwise garage door might NOT reverse when required. DO NOTinstall header bracketover
drywall.
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Concrete anchors MUSTbe used if mounting header bracket or 2x4 into masonry.
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NEVER try to loosen, move or adjustgarage door, springs, cables, pulleys, brackets,or their
hardware, ALL of which are under EXTREME tension.
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ALWAYS call a trained door systems technician if garage door binds,sticks, or is outofbalance.
An unbalanced garage door might NOT reverse when required.
Installation procedures vary according to garage door types. Follow the instructions which apply to your
door.
1. Close the door and mark the inside vertical centerline of the garage door.
2. Extend the line onto the header wall above the door.You can fasten the header bracket within
4 feet (1.22 m) of the left or right of the door center only if a torsion spring or center bearing
plate is in the way; or you can attach it to the ceiling (see page 12) when clearance is
minimal. (It may be mounted on the wall upside down if necessary, to gain approximately
1/2" (1 cm). Ifyou need to install the header bracket on a 2x4 (on wall or ceiling), use lag screws
(notprovided) to securely fasten the 2x4 to structural supports asshown here and on page 12.
3. Open your door to the highestpoint of travel asshown.Draw an intersecting horizontal line on
the header wall 2" (5 cm) above the high point :
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2" (5 cm) above the high point for sectional door and one-piece door with track.
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8" (20 cm) above the high point for one-piece door withouttrack.
This height will provide travel clearance for the top edge of the door. NOTE: Ifthe total number of inches
exceeds the height available in your garage, use the maximum height possible, or refer to page12 for
ceiling installation.
Header Wall
Vertical Centerline of Garage Door
2x4
Structural
Supports
Level
(Optional)
Unfinished
Ceiling
2x4
OPTIONAL CEILING MOUNT
FOR HEADER BRACKET
Sectional door with curved track
Header Wall
Track
2" (5 cm)
Highest Point
of Travel
Door
One-piece door with horizontal track
Header Wall
Track
2" (5 cm)
Highest
Point
of Travel
Door
One-piece door without track:
jamb
hardware
Header Wall
8" (20 cm)
Highest
Point of
Travel
Door
Jamb
Hardware
One-piece door without track:
pivot
hardware
Header Wall
8" (20 cm)
Highest
Point of
Travel
Door
Pivot

Chamberlain HD520EV Specifications

General

Brand	Chamberlain
Model	HD520EV
Category	Garage Door Opener
Language	English