4
SECTIONAL DOOR INSTALLATION
Planning
Identify the type and height of your garage door. Survey
your garage area to see if any of the conditions below
apply to your installation. Additional materials may be
required. You may fi nd it helpful to refer back to this page
and the accompanying illustrations as you proceed with
the installation of your opener.
Without a properly working safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door.
• The gap between the bottom of the garage door and
the fl oor MUST NOT exceed 1/4" (6 mm). Otherwise,
the safety reversal system may NOT work properly.
• The fl oor or the garage door MUST be repaired to
eliminate the gap.
Horizontal and vertical
reinforcement is needed for
lightweight garage doors
(fi berglass, steel, aluminum,
door with glass panels, etc.).
See page 19 for details.
Slack in chain
tension is normal
when garage door
is closed.
Support bracket &
fastening hardware
is required.
See page 11.
Extension
Spring
Motor Unit
OR
Torsion
Spring
Header
Wall
Vertical
Centerline of
Garage Door
Wall-
Mounted
Door
Control
Access
Door
Safety
Reversing
Sensor
Safety
Reversing
Sensor
Gap between fl oor and
bottom of door must not
exceed 1/4" (6 mm).
FINISHED CEILING