Chamberlain 2000SDC 1/2HP - Manual (Page 12)

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The Protector System®
Information you'll need before you begin the installation of 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.
Installation procedures are the same for sectional and
one-piece doors.
Be sure power to the opener is disconnected.
The sending eye transmits an invisible light beam to the
receiving eye. The units can be installed on either side of
the garage door as long as the sun never shines directly
into the receiving eye lens.
Look at the label on the connector end of each case to
identify the sensors.
The brackets must be connected and fastened so that the
sending and receiving eyes face each other as shown.
If an obstruction breaks the light beam while the garage
door is closing, the door will stop and reverse to full open
position and the opener lights will flash for 5 seconds.
The brackets must be securely fastened to a solid surface
such as the studs on either side of the door, or add a piece
of wood at each location if installing in masonry
construction.
The invisible light beam path must be unobstructed. No
part of the garage door (or door tracks, springs, hinges,
rollers or other hardware) can interrupt the beam while
the door is closing. If it does, use a piece of wood to build
out each sensor mounting location to the minimum depth
required for light beam clearance.
A
WARNING
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 no higher than 4"-6"
above the garage floor.
Disconnect power to the garage door opener before
installing the safety reversing sensor.
Facing the door from inside the garage
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