Planning - Chamberlain LiftMaster Security+ 2500B 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
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
Gap between floor
Safety
and bottom of door must not exceed 1/4".
Reversing Sensor
ONE-PIECE DOOR WITHOUT TRACK
Header Wall
Gap between floor
and bottom of door
Safety Reversing Sensor
must not exceed 1/4".
Rail
Extension Spring
OR Torsion Spring
Vertical
Centerline
of Garage Door
Safety
Reversing
Sensor
Rail
Wall-mounted
Door Control
Access Door
Safety
Reversing
Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required. See page 13.
Wall-mounted
Door Control
Access Door
ONE-PIECE DOOR WITH TRACK
Safety
Reversing Sensor
4
Motor unit
Motor unit
Access
Door
Safety
Reversing
Gap between floor
Sensor
and bottom of door
must not exceed 1/4".