Chamberlain CSO 1/2HP - Manual (Page 26)

Adjustment Step 4
Test the Safety Reverse System
Test:
• Place a one-inch board (or a 2x4 laid flat) on the
floor, centered under the garage door.
• Operate the door in the down direction. The door
must reverse on striking the obstruction.
Adjustment:
If the door stops on the obstruction, it is not traveling
far enough in the down direction.
• Increase the DOWN limit by turning the DOWN
limit adjustment screw counterclockwise 1/4 turn.
• Repeat the test.
Make sure limit adjustments do not force the
door arm beyond a straight up and down
position. See the illustration on page 23.
• When the door reverses on the one-inch object
(or 2x4 laid flat), remove the obstruction and run
the opener through 3 or 4 complete travel cycles to
test adjustment.
If the door will not reverse after repeated
adjustment attempts, call for professional
garage door service.
GARAGE DOOR
One-inch Board
(2x4 laid flat)
Failure to test and adjust the safety reverse
system may result in serious injury or death to
persons trapped by a closing garage door.
Repeat this test once a month and adjust as
needed.
26
Adjustment Step 3
Test The Safety Reversing Sensor
• Press the Door Control button to open the door.
• Place the opener carton in the path of the door.
• Press the Door Control button to close the door.
The door will not move more than an inch, and the
opener light will flash.
Professional service is required if the opener
closes the door when the safety reversing
sensor is obstructed.
The garage door opener will not close from a
remote if the indicator light in either sensor is
off, alerting you to the fact that the sensor is
misaligned or obstructed.
The garage door can be closed by pressing and
holding the Door Control button until down travel is
completed.
Safety Reversing Sensor Safety Reversing Sensor
Without a properly working safety reversing
sensor, persons (particularly children) could
be seriously injured or killed if trapped by a
closing garage door. Repeat this test once a
month.
Important safety check
Repeat Adjustment Steps 1, 2 and 4 after:
• Each adjustment of door arm length, force controls
or limit controls.
• Any repair to or adjustment of the garage door
(including springs and hardware).
• Any repair to or buckling of the garage floor.
WARNING
WARNING