Craftsman 139.18451DM Manuel D'instructions page 21

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" (15 cm) above the fl oor.
They may be installed in one of three ways, as follows.
Garage door track installation (preferred):
1. 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 fl ush, 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 (Figures 2 & 3):
1. 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.
2. If additional depth is needed, an extension bracket
(see Accessories) or wood blocks can be used.
3. 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" (15 cm) above the fl oor.
4. Attach brackets to wall with lag screws (not provided).
5. 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 (Figure 4):
1. Use wood blocks or extension brackets (see Accessories) to
elevate sensor brackets so the lenses will be no higher than
6" (15 cm) above the fl oor.
2. Carefully measure and place right and left assemblies at the
same distance out from the wall. Be sure all door hardware
obstructions are cleared.
3. Fasten to the fl oor with concrete anchors as shown.
HARDWARE SHOWN ACTUAL SIZE
Carriage Bolt
1/4"-20x1/2"
Staples (Not Shown)
Wing Nut
1/4"-20
Figure 1
DOOR TRACK MOUNT (RIGHT SIDE)
Door
Track
Lip
Safety
Reversing
Sensor
Bracket
Figure 2
WALL MOUNT (RIGHT SIDE)
Figure 3
WALL MOUNT (RIGHT SIDE)
(Provided with
Extension Bracket)
Figure 4
FLOOR MOUNT (RIGHT SIDE)
21
Indicator
Light
Lens
Fasten Wood Block to Wall with
Lag Screws (Not provided)
Indicator
Safety
Light
Reversing
Sensor
Bracket
Lag Screws
(Not provided)
Lens
Extension Bracket
(See Accessories)
(Provided with
Extension Bracket)
Safety
Reversing
Sensor
Bracket
Indicator
Lens
Light
Attach with
Concrete Anchors
(Not provided)
Lens
Indicator
Light
Safety
Reversing
Sensor
Bracket