Chamberlain 3595S User Manual

Safety Reversing Sensor

Support bracket & 
fastening hardware
is required.
See page 11.

 — — —        — — —        — —

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 18 for details.

Motor Unit

Slack in chain tension
is normal when
garage door is closed.

Vertical 
Centerline of
Garage Door

4

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.

Without a properly working safety reversal system, persons 
(particularly small children) could be SERIOUSLY INJURED or 
KILLED by a closing garage door.
•  The gap between the bottom of the garage door and the floor 

MUST NOT exceed 1/4" (6 mm). Otherwise, the safety 
reversal system may not work properly. 

•  The floor or the garage door MUST be repaired to eliminate 

the gap.