Chamberlain LiftMaster Professional Security+ 2580C 1/2 HP Manuel D'instructions page 18

INSTALLING THE BRACKETS
Be sure power to the opener is disconnected.
Install and align the brackets so the sensors will face
each other across the garage door, with the beam no
higher than 6" above the floor. They may be installed
in one of three ways, as follows.
Garage door track installation (preferred):
• Slip the curved arms over the rounded edge of
each door track, with the curved arms facing the
door. Snap into place against the side of the track.
It should lie flush, with the lip hugging the back
edge of the track, as shown in Figure 1.
If your door track will not support the bracket
securely, wall installation is recommended.
Wall installation:
• Place the bracket against the wall with curved
arms facing the door. Be sure there is enough
clearance for the sensor beam to be unobstructed.
• If additional depth is needed, an extension bracket
(see Accessories) or wood blocks can be used.
• Use bracket mounting holes as a template to
locate and drill (2) 3/16" diameter pilot holes on
the wall at each side of the door, no higher than 6"
above the floor.
• Attach brackets to wall with lag screws
(not provided).
• If using extension brackets or wood blocks, adjust
right and left assemblies to the same distance out
from the mounting surface. Make sure all door
hardware obstructions are cleared.
Floor installation:
• Use wood blocks or extension brackets (see
Accessories) to elevate sensor brackets so the
lenses will be no higher than 6" above the floor.
• Carefully measure and place right and left
assemblies at the same distance out from the wall.
Be sure all door hardware obstructions are
cleared.
• Fasten to the floor with concrete anchors as
shown.
HARDWARE SHOWN ACTUAL SIZE
Carriage Bolt
1/4"-20x1/2"
Wing Nut Staples
Figure 1
DOOR TRACK MOUNT (RIGHT SIDE)
Door
Track
Lip
Sensor
Bracket
Figure 2
WALL MOUNT (RIGHT SIDE)
(Provided with
Extension
Bracket)
Figure 3
FLOOR MOUNT (RIGHT SIDE)
Lens
Sensor
Bracket
(Provided with
Extension
Bracket)
18
Indicator
light
Lens
Extension
Bracket
(See Accessories)
(Provided with
Extension Bracket)
Sensor
Bracket
Indicator
light
Lens
Indicator
light
(Provided with
Extension Bracket)
Attach with
concrete anchors
(not provided)
Extension
Bracket
(See Accessories)