Craftsman 139.53915D User's Manual | Page 20

Craftsman Garage Door Opener User's Manual - 139.53915D.
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Invisible Light Beam
Protection Area

Safety Reversing Sensor
6" (15 cm) max. above floor

Safety Reversing Sensor
6" (15 cm) max. above floor

Facing the door from inside the garage

INSTALLATION STEP 10
Install The Protector System®

The safety reversing sensor must be connected and aligned 
correctly before the garage door opener will move in the down 
direction. 

IMPORTANT INFORMATION ABOUT THE SAFETY REVERSING 
SENSOR

When properly connected and aligned, the sensor will detect an 
obstacle in the path of its electronic beam. The sending eye (with 
an amber indicator light) transmits an invisible light beam to the 
receiving eye (with a green indicator light). If an obstruction 
breaks the light beam while the door is closing, the door will stop 
and reverse to full open position, and the opener lights will flash 
10 times.

The units must be installed inside the garage so that the sending 
and receiving eyes face each other across the door, no more than 
6" (15 cm) above the floor. Either can be installed on the left or 
right of the door as long as the sun never shines directly into the 
receiving eye lens.

The mounting brackets are designed to clip onto the  track of 
sectional garage doors without additional hardware.

If it is necessary to mount the units on the wall, the brackets 
must be securely fastened to a solid surface such as the wall 
framing. Extension brackets (see Accessories) are available if 
needed. If installing in masonry construction, add a piece of wood 
at each location to avoid drilling extra holes in masonry if 
repositioning is necessary. 

The invisible light beam path must be unobstructed. No part of 
the garage door (or door tracks, springs, hinges, rollers or other 
hardware) may interrupt the beam while the door is closing.

Be sure power is not connected to the garage door opener 
BEFORE installing the safety reversing sensor.
To prevent SERIOUS INJURY or DEATH from a closing garage 
door:
•  Correctly connect and align the safety reversing sensor. This 

required safety device MUST NOT be disabled.

•  Install the safety reversing sensor so beam is NO HIGHER 

than 6" (15 cm) above garage floor.

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