Typical Installation; Install The Header Bracket - Liftmaster H Manuel D'installation

TYPICAL INSTALLATION

INSTALL THE HEADER BRACKET

The trolley operator is generally mounted over the center of the
door. However, off center mounting may be required due to
interfering structures or location of door stile / top section support.
Typically, the operator may be mounted up to 24 inches off center
on torsion spring doors. Extension springs require center
mounting.
1
Close the door. Mark the center of the door with a vertical line,
extend the line onto the ceiling.
2
Open the door to the highest point of travel mark 4 inches
above the highest point of travel.
3
Center the header bracket on the vertical center line and the
horizontal line.
4
Drill the pilot holes for the header bracket.
5
Fasten the header bracket with appropriate hardware
(not provided).
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Typical Installation - Trolley
To prevent possible SERIOUS INJURY or DEATH:
• Header bracket MUST be RIGIDLY fastened to structural
support on header wall or ceiling, otherwise door might NOT
reverse when required. DO NOT install header bracket over
drywall.
• Concrete anchors MUST be used if mounting header bracket
or 2x4 into masonry.
• NEVER try to loosen, move or adjust door, springs, cables,
pulleys, brackets, or their hardware, ALL of which are under
EXTREME tension.
• ALWAYS call a trained door systems technician if door binds,
sticks, or is out of balance.
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WARNING WARNING
CAUTION
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