Craftsman 139.18987 Owner's Manual download pdf (Page 21)

Without a properly working safety reversing

sensor, persons (particularly children) could

be injured or killed by a closing garage door.

Read and follow all instructions.

To protect small children, install the safety

reversing sensor so that the beam will be

between 4 – 6" above the garage floor.

Disconnect power to the garage door opener

before installing the safety reversing sensor.

Invisible Light Beam

Protection Area

Sensor Beam

4-6" max.

above floor

Sensor Beam

4-6" max.

above floor

Figure 1: Facing the door from inside the garage

The Safety Reversing System

IMPORTANT INFORMATION ABOUT THE

SAFETY REVERSING SENSOR

The safety reversing sensor

must

be connected

and aligned correctly before the garage door

opener will move in the down direction. This is a

required safety device and cannot be disabled.

When properly connected and aligned, the safety

reversing sensor will detect an obstacle in the path

of its electronic beam. The sending eye (with an

orange 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 light 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, between 4 – 6" 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.

WARNING

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Craftsman 139.18987 Owner's Manual Page 21

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