Lift-master 87LM User Manual
The Protector System™
Safety Reversing Sensor Model 87LM
WARNING
Without a properly working safety reversing
sensor, persons (particularly children) could be
killed by a closing garage door.
all instructions.
To protect small children, install the safety
reversing sensor so the beam is no higher than
4"-6" above the garage floor.
Disconnect power to the garage door opener
before installing the Protector System.
Read and follow
Installation procedures are
the same for sectional and
one-piece doors.
—Left Side of Garage—
Sensor
Unit
Invisible Light Beam
Protection Area
FIGURE 1 Facing the door from inside the garage
Look at the label on the connector end of each case
to identify the sensors.
The sending eye transmits an invisible light beam to
the receiving eye.
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 to alert you to the obstruction.
The units can be installed on either side of the garage
door (Figure 1) as long as the sun never shines
directly into the receiving eye lens,
must be connected and fastened so that the sending
and receiving eyes face each other as shown in
Figure 1.
but
the brackets
— Right Side of Garage —
Sensor
Unit
The brackets
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.
must
be securely fastened to a solid
1
Figures 2 , 3 and 4 show recommended assembly of
bracket(s) and "C" wrap based on the
wall
installation of
the sensors on each side of the garage door as shown
on page 1, or on the
garage door tracks
themselves.
Figures 5 and 6 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.
Garage Wall or Door Track
Installation Procedure
• Fasten the "C" wraps to the mounting brackets with
square holes, using the hardware shown in Fig. 2.
Garage Wall
Installation Procedure
• Connect each assembly to a slotted bracket, using the
hardware shown in Fig. 3. Note alignment of
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 1.
• Attach bracket assemblies with 1/4"x1-1/2" lag screws
as shown in Fig. 3.
• Adjust right and left side bracket assemblies to the
same distance out from mounting surface. Make sure
all door hardware obstructions are cleared. Tighten the
nuts securely .
Garage WALL or DOOR TRACK Installation
Mounting Bracket
With Square Holes
#10 - 32
Lock Nuts
FIGURE 2
Garage WALL Installation
Inside
Garage
Wall
Lock Nuts
Garage
Door Track
1/4 x 1-1/2"
Lag Screws
Mounting Bracket
with Slot1/4" - 20
Garage DOOR Track Installation
Inside
Garage
Wall
1/4-20 x 1/2" Carriage Bolts
Mounting Bracket
with Square Holes
1/4 " Lock Nuts
"C" Wrap
#10-32x3/8"
Screws
(with square shoulder)
"C" Wrap
FIGURE 3
Mounting Bracket
with Square Holes
Garage Door Track
Installation Procedure
Discard slotted bracket. Drill 3/8" holes in each track and
fasten securely with hardware as shown in Fig. 4.
Hardware Shown Actual Size
#10 - 32 x 3/8"
Screw
Garage
#10 x 32
Lock Nut
Alternate Wall Mount
Inside
Wall
Mounting Bracket
with Slot
Mounting Bracket
with Square Holes
"C" Wrap
Sensor
Indicator Light
1/4 x 1-1/2"
Lag Screw
Drill 3/8"
Holes
1/4-20 x 1/2"
Carriage Bolts
Staples
Alternate Floor Mount
Inside
Garage
Wall
"C" Wrap
Indicator Light
FIGURE 4
1/4" - 20 x 1/2"
Carriage Bolts
Sensor
Mounting Bracket
with Square Holes
Mounting Bracket
"C" Shaped
Wrap
1/4" - 20
Lock Nut
with Slot
Attach with
concrete anchors
(not provided)
Garage
Floor
Garage
Floor
FIGURE 5 FIGURE 6
2
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