Chamberlain LiftMaster PROFESSIONAL SECURITY+ 1265LMC 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 must not exceed 1/4"
Safety
Reversing Sensor
Slack in chain tension
is normal when
garage door is closed.
Torsion Spring
Door
Center
Safety
Reversing
Sensor
Gap between floor and bottom of door
must not exceed 1/4"
Wall-
mounted
Door
Access
Control
Door
Safety
Reversing Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 13.
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
and bottom of door
Sensor
must not exceed 1/4"