Planning - Chamberlain LiftMaster Professional Security+ 3245CM Owner's Manual

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 find it helpful to refer back to this page and the
accompanying illustrations as you proceed with the installation of your opener.
SECTIONAL DOOR INSTALLATION
Horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, steel, aluminum,
door with glass panels, etc.).
See page 19 for details.
Header Wall
Safety Reversing Sensor
ONE-PIECE DOOR WITHOUT TRACK
Header
Wall
Gap between floor and bottom of
door must not exceed 1/4" (6 mm).
Safety
Reversing Sensor
Slack in chain tension
is normal when
garage door is closed.
Torsion Spring
Vertical Centerline
of Garage Door
Safety
Reversing
Sensor
Gap between floor and bottom of door
must not exceed 1/4" (6 mm).
Wall-
mounted
Door
Control
Access
Door
Safety
Reversing Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 12.
Extension Spring
Wall-
OR
mounted
Door
Control
Access Door
ONE-PIECE DOOR WITH TRACK
Safety
Reversing Sensor
4
Motor Unit
Motor Unit
Access
Door
Safety
Gap between floor
Reversing Sensor
and bottom of door
must not exceed 1/4" (6 mm).