Installation Section - Chamberlain Merlin Whisper Drive MT3850EVO Installation And Operating Instructions Manual

INSTALLATION STEP 1
Determine the Header Bracket
Location
To prevent possible SERIOUS INJURY or DEATH:
• Header bracket MUST be RIGIDLY fastened to structural
support on header wall or ceiling, otherwise garage door might
not reverse when required. DO NOT install header bracket over
plasterboard wall.
• Concrete anchors MUST be used if mounting header bracket to
masonry.
• NEVER try to loosen, move or adjust garage door, springs,
cables, pulleys, brackets, or their hardware, ALL of which are
under EXTREME tension.
• ALWAYS call a qualified door technician if garage door binds,
sticks, or is out of balance. An unbalanced garage door might
not reverse when required.
1. Close the door and mark the inside vertical centreline
of the garage door.
2. Extend the line onto the header wall above the door.
3. Open your door to the highest point of travel as shown.
Draw an intersecting horizontal line on the header wall
above the high point 50 mm to 75 mm above the high
point.
This height will provide travel clearance for the top
edge of the door.
NOTE: If the available height above the highest
point of your door is less than recommended, use
the maximum height possible (as long as the door
does not contact the rail), or refer to page 9 for
ceiling installation.
Header Wall
Sectional door with curved track
8
Unfinished
Ceiling
OPTIONAL
CEILING
MOUNT
FOR
HEADER
BRACKET
Timber brace
Vertical Centreline
of Garage Door
Timber Brace
Structural
Supports
Level
(optional)
Header Wall
Track
50 mm
Highest Point
of Travel
Door