Chamberlain 2500B - Manual (Page 4)

Safety
Reversing Sensor
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
Support bracket &
fastening hardware
is required. See page 13.
FINISHED CEILING
Extension Spring
OR Torsion Spring
Motor unit
Wall-mounted
Door Control
Rail
Access Door
Gap between floor
and bottom of door must not exceed 1/4".
Vertical
Centerline
of Garage Door
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 find it helpful to refer back to this page
as you proceed with the installation of your opener.
Safety Reversing Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required. See page 13.
Safety
Reversing
Sensor
Header Wall
Access Door
Gap between floor
and bottom of door
must not exceed 1/4".
Motor unit
Wall-mounted
Door Control
Rail
Access
Door
Safety
Reversing Sensor
Safety
Reversing
Sensor
Gap between floor
and bottom of door
must not exceed 1/4".
ONE-PIECE DOOR WITHOUT TRACK
ONE-PIECE DOOR WITH TRACK