LiftMaster 8557 8557 Manual - Page 18

Install the Safety Reversing Sensors, OPTION A DOOR TRACK INSTALLATION, OPTION B WALL INSTALLATION

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Install the Protector System® 1 Install the Safety Reversing Sensors The safety reversing sensors can be attached to the door track, the wall, or the floor. If the door track will not support the sensor bracket a wall installation is recommended. Choose one of the following installations. HARDWARE Carriage Bolt 1/4"-20x1/2" OPTION A DOOR TRACK INSTALLATION 1.1A Slide the curved arms of the sensor bracket around the edge of the door track. Snap into place so that the sensor bracket is flush against the track. 1.2A Slide the carriage bolt into the slot on each sensor. 1.3A Insert the bolt through the hole in the sensor bracket and attach with the wing nut. The lenses on both sensors should point toward each other. Make sure the lens is not obstructed by the sensor bracket. Wing Nut 1/4"-20 Wing Nut 1/4" - 20 Carriage Bolt 1/4" - 20 x 1/2" OPTION B WALL INSTALLATION If additional clearance is needed an extension bracket (not provided) or wood blocks can be used. Make sure each bracket has the same amount of clearance so they will align correctly. 1.1B Position the sensor bracket against the wall with the curved arms facing the door. Make sure there is enough clearance for the beam to be unobstructed. Mark holes. (not provided) 1.2B Drill 3/16 inch pilot holes for each sensor bracket and attach the sensor brackets to the wall using lag screws (not provided). 1.3B Slide the carriage bolt into the slot on each sensor. IGWnasairldal ege (not provided) Lens Carriage Bolt 1/4" - 20 x 1/2" 1.4B Insert the bolt through the hole in the sensor bracket and attach with the wing nut. The lenses on both sensors should point toward each other. Make sure the lens is not obstructed by the sensor bracket. Wing Nut 1/4" - 20 18

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Install the Protector System
®
1
Install the Safety Reversing Sensors
The safety reversing sensors can be attached to the door track, the wall, or the floor. If the door track will not support the sensor bracket a wall installation is recommended. Choose one of the following installations.
HARDWARE
Carriage Bolt
1/4"-20x1/2"
Wing Nut
1/4"-20
OPTION
A
DOOR TRACK INSTALLATION
1.1A
Slide the curved arms of the sensor
bracket around the edge of the door
track. Snap into place so that the
sensor bracket is flush against the
track.
1.2A
Slide the carriage bolt into the slot on
each sensor.
Carriage Bolt
1/4" - 20 x 1/2"
1.3A
Insert the bolt through the hole in the sensor
bracket and attach with the wing nut. The lenses
on both sensors should point toward each other.
Make sure the lens is not obstructed by the
sensor bracket.
Wing Nut
1/4" - 20
OPTION
B
WALL INSTALLATION
If additional clearance is needed an extension bracket (not provided) or wood blocks can be used. Make sure each bracket has the same amount of clearance so they will align correctly.
1.1B
Position the sensor bracket against the
wall with the curved arms facing the
door. Make sure there is enough
clearance for the beam to be
unobstructed.Markholes.
(not provided)
1.2B
Drill 3/16 inch pilot holes for each sensor
bracket and attach the sensor brackets
to the wall using lag screws (not
provided).
Inside
Garage
Wall
(not provided)
1.3B
Slide the carriage bolt into the slot on
each sensor.
Lens
Carriage Bolt
1/4" - 20 x 1/2"
1.4B
Insert the bolt through the hole in the sensor
bracket and attach with the wing nut. The lenses
on both sensors should point toward each
other. Make sure the lens is not obstructed by
the sensor bracket.
Wing Nut
1/4" - 20
18