Controlled-products-systems-group 8550C-7 Manual do Utilizador descarregar pdf (Página 7)

To preventpossible SERIOUS INJURY or

DEATH:

• Header bracketMUST be RIGIDLY

fastened to structural supporton header

wall or ceiling,otherwise garage door might

NOTreverse when required.DO NOT

install header bracket over drywall.

• Concrete anchors MUSTbe used if

mounting header bracket or 2x4 into

masonry.

• NEVER tryto loosen,move or adjust

garage door, springs, cables, pulleys,

brackets, or their hardware, ALL of which

are under EXTREME tension.

• ALWAYS call a trained door systems

technician if garage door binds, sticks, or is

out of balance.An unbalanced garage

door might NOT reverse when required.

• DO NOT enable the Timer-to-Close

functionality if operating either one-piece or

swinging garage doors.To be enabled

ONLY when operating a sectional door.

1 Determine the header bracket location

NOTE: If you are installing the garage door opener on a one-piece door, visit www.liftmaster.com for

installation instructions.

1.1 Close the door and mark the inside vertical centerline ofthe garage door.

1.2 Extend the line onto the header wall above the door.

Youcan fasten the headerbracket within 4 feet (1.22 m) of the left or right of the door

center only if a torsion spring orcenter bearingplate is in the way; or you can attach it to

the ceilingwhenclearance is minimal. (It may be mounted on the wallupside down if

necessary,togain approximately 1/2" (1 cm).

If you need to install the header bracket on a 2x4 (on wall or ceiling),use lag screws (not

provided) to securely fasten the 2x4 to structural supports.

1.3 Open your door to the highest point of travel as shown. Draw an intersecting horizontal line on

the header wall 2" (5 cm) above the high point. This heightwill provide travel clearance for the

top edge of the door.

NOTE: If the total number of inches exceeds the height available in your garage, use the maximum

height possible, or refer to page 8 for ceiling installation.

Sectional door with curved track

Header Wall

Track

2" (5 cm)

Highest Point

of Travel

Door

Header Wall

Unfinished

Ceiling

Vertical Centerline

of Garage Door

2x4

Structural

Supports

Level

(Optional)

OPTIONAL

CEILING

MOUNT FOR

HEADER

BRACKET

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