Chamberlain LiftMaster PROFESSIONAL SECURITY+ 1280LMC-R Manuel Du Propriétaire page 4

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 20 for details.
Header Wall
Safety Reversing Sensor
ONE-PIECE DOOR WITHOUT TRACK
Header
Wall
Gap between floor
and bottom of door
Safety Reversing
must not exceed 1/4"
Sensor
Torsion
Spring
Door
Center
Safety
Gap between floor
Reversing
and bottom of door
Sensor
must not exceed 1/4"
Wall-mounted Door Control
Access
Door
Safety Reversing
Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 13.
Extension
Spring
OR
Access
Door
Wall-
mounted
Door
Control
Motor Unit
ONE-PIECE DOOR WITH TRACK
Safety
Reversing Sensor
4
Motor unit
Access
Door
Safety
Reversing Sensor
Floor must be level
across width of door