Planning - Chamberlain 3850 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
Torsion
Vertical
Centerline
of Door
Safety
Reversing Sensor
Gap between floor and bottom
of door must not exceed 1/4" (6 mm)
Wall-
mounted
Door
Access
Control
Door
Safety
Reversing Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 12.
Extension
Spring
OR
Spring
Access
Door
ONE-PIECE DOOR WITH TRACK
Safety Reversing Sensor
4
Motor Unit
Wall-
mounted
Door
Control
Motor Unit
Gap between floor and bottom of door
must not exceed 1/4" (6 mm).
Access
Door
Safety Reversing Sensor