Chamberlain 3850 User Manual

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.
Support bracket
& fastening
hardware is required.
See page 12.
FINISHED CEILING
Safety
Reversing Sensor
Header
Wall
Access
Door
Safety
Reversing Sensor
Gap between floor and bottom of
door must not exceed 1/4" (6 mm)
Wall-
mounted
Door
Control
Motor Unit
ONE-PIECE DOOR WITHOUT TRACK
Access
Door
Safety Reversing Sensor
Gap between floor and bottom of door
must not exceed 1/4" (6 mm).
Safety Reversing Sensor
ONE-PIECE DOOR WITH TRACK
Safety
Reversing Sensor
Support bracket &
fastening hardware
is required.
See page 12.
— — — — — — — —
Header Wall
FINISHED CEILING
Torsion
Spring
Extension
Spring
OR
Safety
Reversing Sensor
Gap between floor and bottom
of door must not exceed 1/4" (6 mm)
Access
Door
Wall-
mounted
Door
Control
Horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, steel, aluminum, door with
glass panels, etc.). See page 19 for details.
Motor Unit
Vertical
Centerline
of Door
SECTIONAL DOOR INSTALLATION

Chamberlain 3850 Specifications

General

Brand	Chamberlain
Model	3850
Category	Garage Door Opener
Language	English