Craftsman 1/2HP Garage Door Opener 139.53515SR - Manual (Page 18)

Adjustment
STEP 3
Test Safety Reverse System
A
THE SAFETY REVERSE SYSTEM TEST IS IMPORTANT. GARAGE DOOR MUST REVERSE ON CONTACT
WITH A ONE INCH OBSTACLE PLACED ON THE FLOOR. FAILURE TO PROPERLY ADJUST OPENER MAY
RESULT IN SERIOUS PERSONAL INJURY FROM A CLOSING GARAGE DOOR. REPEAT TEST AT LEAST
FOUR TIMES A YEAR AND ADJUST AS NEEDED.
PROCEDURE: Place a 1-inch obstacle on the floor under
the garage door. Operate door in DOWN direction. The
door MUST reverse on the obstruction.
If the door STOPS on the obstruction, it is not traveling
far enough in the DOWN direction. Increase the DOWN
limit by turning DOWN limit adjustment screw counter­
clockwise 1/4 turn, REPEAT TEST.
NOTE: Make sure limit adjustments do not force the
door arm beyond a straight up and down position. See
the illustration on Page 16.
When the door reverses on the 1-inch obstacle, remove
the obstruction and run the opener through a complete
travel cycle. Door MUST NOT reverse in closed position.
If it does, repeat Adjustment Steps i, 2 and 3.
A
REPEAT ADJUSTMENT STEP 3 AFTER:
• EACH ADJUSTMENT OF DOOR ARM LENGTH, CLOSE FORCE OR DOWN LIMIT.
• ANY REPAIR OR ADJUSTMENT OF GARAGE DOOR (INCLUDING SPRINGS AND HARDWARE).
• ANY REPAIR OR BUCKLING OF THE GARAGE FLOOR.
• ANY REPAIR OR ADJUSTMENT OF THE GARAGE DOOR OPENER.
(Optional)
STEP 4
Install Infrared Reversing Sensor
The INFRARED REVERSING SENSOR provides an
ADDITIONAL measure of safety against a small child
being caught under a garage door. It uses an invisible
beam which, when broken by an obstruction, causes a
closing door to open and prevents an opjen door from
closing.
After the garage door opener has been completely installed
and adjusted, the INFRARED REVERSING SENSOR
accessory can be installed. Instructions are included with
this optional device.
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