Install The Safety Reversing Sensor - Chamberlain 3500 - 1/2HP Series Owner's Manual

Installation Step 10

Install the Safety Reversing Sensor

Figures 2 and 3 show assembly of brackets and "C"
wrap based on the recommended installation of the
sensors as shown on page 21.
However, Figures 4 and 5 are variations which may
fit your installation requirements better. Make sure
the wraps and brackets are aligned so the
sensors will face each other across the garage
door.
• Fasten the "C" wraps to the mounting brackets
having square holes, using the hardware shown
in Figure 2.
• Connect each assembly to a slotted bracket, using
the hardware shown in Figure 3.
Note the alignment of the brackets for left and
right sides of the door.
• Finger tighten the lock nuts.
• Use bracket mounting holes as a template to
locate and drill (2) 3/16" diameter pilot holes on
both sides of the garage door, 4"-6" above the
floor (but not exceeding 6"). (See warning on
page 21.)
• Attach bracket assemblies with 1/4"x1-1/2" lag
screws as shown in Figure 3.
• Adjust right and left side bracket assemblies to the
same distance out from the mounting surface.
Make sure all door hardware obstructions are
cleared. Tighten the nuts securely.
#10-32x3/8" #10x32
Lock Nut
Screw
Figure 4
Alternate Wall Mount
Inside
Garage
Wall
Mounting Bracket
Garage
Floor
Hardware Shown Actual Size
1/4x1-1/2"
Lag Screw
with Slot
Mounting Bracket
with Square Holes
"C" Wrap
Sensor
Indicator Light
Mounting Bracket
Figure 2
With Square Holes
#10-32
Lock Nuts
Figure 3
Inside
Garage
Wall
Mounting Bracket
1/4"-20
Lock Nuts
Staples
Figure 5
Alternate Floor Mount
Inside
Garage
Wall
"C" Wrap
22
"C" Wrap
#10-32x3/8"
Screws
1/4x1-1/2"
1/4-20x1/2" Carriage Bolts
Lag Screws
(with square shoulder)
"C" Wrap
with Slot
Mounting Bracket
with Square Holes
1/4"-20x1/2"
Carriage Bolts Lock Nut
Indicator Light
Sensor
Mounting Bracket
with Square Holes
Mounting Bracket
with Slot
Attach with
concrete anchors
(not provided)
Garage
Floor
1/4"-20