Chamberlain 8550 User manual

Serial Number:
Date of Purchase:
Belt Drive Garage Door Opener
The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
.
Write down the following information
for future reference:
NOTE: If you are installing the garage door opener on a one-piece door, visit
www.liftmaster.com for installation instructions.
Contents
Model 8550
FOR RESIDENTIAL USE ONLY
BELT DRIVE GARAGE DOOR OPENER.. 1
PREPARATION............................. 2
ASSEMBLY................................. 4
INSTALLATION ........................ 6-13
INSTALL THE DOOR CONTROL.....14-16
INSTALL THE
PROTECTOR SYSTEM®..............17-20
POWER ................................21-22
ADJUSTMENT.........................23-25
BATTERY BACKUP ...................26-27
OPERATION ...............................28
FEATURES.................................29
DOOR CONTROL .....................30-31
REMOTE CONTROLS.................32-33
TO ERASE THE MEMORY ...............33
TO OPEN THE DOOR MANUALLY ......34
MAINTENANCE ...........................34
TROUBLESHOOTING.................35-36
REPAIR PARTS .......................37-38
ACCESSORIES ............................39
WARRANTY ...............................40
■Please read this manual and the enclosed safety materials carefully!
■Fasten the manual near the garage door after installation.
■The door WILL NOT CLOSE unless the Protector System®is connected and properly
aligned.
■Periodic checks of the garage door opener are required to ensure safe operation.
■The model number label is located on the left side panel of your garage door opener.
■This garage door opener is ONLY compatible with MyQ™and Security✚®2.0
accessories.
■DO NOT enable the Timer-To-Close feature if you are installing the garage door
opener on a one-piece door. The Timer -To-Close is to be used ONLY with
sectional doors.

2
Safety Symbol and Signal
Word Review
This garage door opener has been designed and
tested to offer safe service provided it is installed,
operated, maintained and tested in strict
accordance with the instructions and warnings
contained in this manual.
When you see these Safety Symbols and Signal
Words on the following pages, they will alert you
to the possibility of serious injury or death if you
do not comply with the warnings that accompany
them. The hazard may come from something
mechanical or from electric shock. Read the
warnings carefully.
Mechanical
Electrical
When you see this Signal Word on the following
pages,it will alert you to the possibility of damage
to your garage door and/or the garage door
opener if you do not comply with the cautionary
statements that accompany it. Read them
carefully.
Check the Door
1. Disable locks and remove any ropes
connected to the garage door.
2. Lift the door halfway up. Release the
door. If balanced, it should stay in
place, supported entirely by its springs.
3. Raise and lower the door to check for
binding or sticking. If your door binds,
sticks, or is out of balance, call a trained
door systems technician.
4. Check the seal on the bottom of the
door. Any gap between the floor and
the bottom of the door must not exceed
1/4 inch (6 mm). Otherwise, the safety
reversal system may not work properly.
5. The opener should be installed above
the center of the door. If there is a
torsion spring or center bearing plate
in the way of the header bracket, it may
be installed within 4 feet (1.2 m) to the
left or right of the door center. See
installing the Header Bracket section.
Torsion Spring Extension Spring
To prevent possible SERIOUSINJURYor
DEATH:
• ALWAYS call a trained door systems
technician if garage door binds, sticks, or is
out of balance. An unbalanced garage
door may not reverse when required.
• NEVER try to loosen, move or adjust
garage door, door springs, cables, pulleys,
brackets or their hardware, ALLof which
are under EXTREMEtension.
• Disable ALLlocks and remove ALLropes
connected to garage door BEFORE
installation and operating garage door
opener to avoid entanglement.
To prevent damage to garage door and
opener:
• ALWAYS disable locks BEFORE installing
and operating the opener.
• ONLY operate garage door opener at
120 V, 60 Hz to avoid malfunction and
damage.
Tools Needed
2
1
3/16
7/16
1/2
5/32
5/16
5/8
9/16
1/4
7/16
Preparation

3
AB
C
J
N
I
O
DE
F
H
GK
L
M
Overview/Carton Inventory
GARAGE DOOR OPENER ASSEMBLY
A.tekcarbredaeH
B.Pulley and bracket
C.tekcarbrooD
D.mrarooddevruC
E.mraroodthgiartS
F.yellorT
G. Emergency release rope and handle
H.Rail
I.reneporoodegaraG
NOTE: Accessories will vary depending on the garage door opener model purchased. Depending on your specific model, other accessories
may be included with your garage door opener. The instructions for these accessories will be attached to the accessory and are not included
in this manual. The images throughout this manuals are for reference and your product may look different.
J. swercsdnarevoctekcorpS
K.tleB
L.lortnocrooD
M. eriwetihw/derdnaetihW
The Protector System®
N.srosnesgnisreverytefaS
with white and white/black wire attached:
Sending Sensor (1) Receiving Sensor (1)
and Safety Sensor Brackets (2)
O.erutaretildnaslebalytefaS
Hardware
Assembly
H1 Hex Screw #8x3/8" (3)
[packed with the sprocket cover]
Installation
H2 Hex Bolt 5/16"-18 x 7/8" (4)
H3 Lag Screw 5/16"-9 x 1-5/8" (2)
H4 Lag Screw 5/16"-18 x 1-5/8" (2)
H5 Clevis Pin 5/16" x 2-3/4" (1)
H6 Clevis Pin 5/16" x 1-1/4" (1)
H7 Clevis Pin 5/16" x 1" (1)
H8 Nut 5/16"-18 (4)
H9 Lock Washer 5/16"-16 (4)
H10 Self-Threading Screw 1/4"-14 x 5/8" (2)
H11 Ring Fastener (3)
H12 Carriage Bolt 1/4"-20 x 1/2" (2)
H13 Wing Nut 1/4"-20 (2)
Door Control Hardware
H14 Screw 6AB x 1-1/4" (2)
H15 Screw 6-32 x 1" (2)
H16 Drywall Anchors (2)
H17 Insulated Staples (10)
895MAX
Remote Control
880LM
Smart Control
Panel®829LM
Garage Door
Monitor
MyQ™AND SECURITY✚®2.0
ACCESSORIES

4
To avoid possible SERIOUS INJURY to finger
from moving garage door opener:
• ALWAYS keep hand clear of sprocket while
operating opener.
• Securely attach sprocket cover BEFORE
operating.
To avoid SERIOUS damage to garage door
opener, use ONLY those bolts/fasteners
mounted in the top of the opener.
.
Mounted in the
garage door opener
HARDWARE
H1 (3)
Hex Screw
#8x3/8"
(Packed with the
sprocket cover)
NOTE: ONLY use the bolts removed from the
garage door opener.Place the garage door
opener on the packing material to prevent
scratching.
1.1 Remove the two bolts from the top of the
garage door opener.
1.2 Align the rail and the styrofoam over the
sprocket. Cut the tape from the rail, belt,
and styrofoam.
1.3 Fasten the rail with the previously removed
bolts.
1.4 Position the belt around the garage door
opener sprocket.
1.5 Attach the sprocket cover over the garage
door opener sprocket and attach with hex
screws (H1).
H1
Assembly
1Attach the rail to the garage door opener

5
2Tighten the Belt
2.1 By hand, thread the spring trolley nut on the threaded shaft until it is finger tight against
the trolley. Do not use any tools.
Spring Trolley Nut
(To motor unit)
2.2 Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmly against the trolley.
Nut ring
slot
2.3 Tighten the spring trolley nut with an adjustable wrench or a 7/16” open end wrench about a quarter turn until the spring releases and snaps the nut ring against the trolley. This sets the spring to
optimum belt tension.
Nut Ring Nut Ring
AFTER RELEASE
1-1/4"
(3.18 cm)
BEFORE
1"
(2.5 cm)

6
IMPORTANT INSTALLATION INSTRUCTIONS
WARNING
To reduce the risk of SEVERE INJURY or DEATH:
1. READ AND FOLLOW ALL INSTALLATION WARNINGS AND INSTRUCTIONS.
2. Install garage door opener only on properly balanced and lubricated garage door. An
improperly balanced door may not reverse when required and could result in SEVERE
INJURY or DEATH.
3. ALL repairs to cables, spring assemblies and other hardware MUST be made by a trained
door systems technician BEFORE installing opener.
4. Disable ALL locks and remove ALL ropes connected to garage door BEFORE installing
opener to avoid entanglement.
5. Install garage door opener 7 feet (2.13 m) or more above floor.
6. Mount the emergency release within reach, but at least6 feet (1.83 m) above the floor and
avoiding contact with vehicles to avoid accidental release.
7. NEVER connect garage door opener to power source until instructed to do so
8. NEVERwear watches, rings or loose clothing while installing or servicing opener. They could
be caught in garage door or opener mechanisms.
9. Install wall-mounted garage door control:
• within sight of the garage door.
• out of reach of children at minimum height of 5 feet (1.5 m).
• away from ALL moving parts of the door.
10. Place entrapment warning label on wall next to garage door control
11. Place manual release/safety reverse test label in plain view on inside of garage door.
12. Upon completion of installation, test safety reversal system. Door MUST reverse on.contact with
a 1-1/2" (3.8 cm) high object (or a 2x4 laid fl at) on the floor.
13. To avoid SERIOUS PERSONAL INJURY or DEATH from electrocution, disconnectALL
electric and battery power BEFORE performing any service or maintenance.
14. DO NOT enable the Timer-to-Close functionality if operating either one-piece or swinging
garage doors. To be enabled ONLY when operating a sectional door.
NOTE:If you are installing the garage door opener on a one-piece door, visit www.liftmaster.com for installation instructions.
Installation

7
To prevent possible SERIOUS INJURY or
DEATH:
• Header bracket MUST be RIGIDLY
fastened to structural support on header
wall or ceiling, otherwise garage door might
NOT reverse when required. DO NOT
install header bracket over drywall.
• Concrete anchors MUST be used if
mounting header bracket or 2x4 into
masonry.
• NEVER try to loosen, move or adjust
garage door, springs, cables, pulleys,
brackets, or their hardware, ALL of which
are under EXTREME tension.
• ALWAYS call a trained door systems
technician if garage door binds, sticks, or is
out of balance. An unbalanced garage
door might NOT reverse when required.
• DO NOT enable the Timer-to-Close
functionality if operating either one-piece or
swinging garage doors. To be enabled
ONLY when operating a sectional door.
1Determine the header bracket location
NOTE: Ifyou are installing the garage door opener on a one-piece door, visit www.liftmaster.com for
installation instructions.
1.1 Close the door and mark the inside vertical centerline of the garage door.
1.2 Extend the line onto the header wall above the door.
You can fasten the header bracket within 4 feet (1.22 m) of the left or right of the door
center only if a torsion spring or center bearing plate is in the way; or you can attach it to
the ceiling when clearance is minimal. (It may be mounted on the wall upside down if
necessary, to gain approximately 1/2" (1 cm).
If you need to install the header bracket on a 2x4 (on wall or ceiling), use lag screws (not
provided) to securely fasten the 2x4 to structural supports.
1.3 Open your door to the highest point of travel as shown. Draw an intersecting horizontal line on
the header wall 2" (5 cm) above the high point.This height will provide travel clearance for the
top edge of the door.
NOTE: Ifthe total number of inches exceeds the height available in your garage, use the maximum
height possible, or refer to page 8 ceiling installation.
Sectional door with curved track
Header Wall
Track
2" (5 cm)
Highest Point
of Travel
Door
Header Wall
Unfinished Ceiling
Vertical Centerline
of Garage Door 2x4
2x4
Structural
Supports
Level
(Optional)
OPTIONAL
CEILING
MOUNT FOR
HEADER
BRACKET

8
You can attach the header bracket either to the
wall above the garage door, or to the ceiling.
Follow the instructions which will work best for
your particular requirements. Do not install the
header bracket over drywall. If installing into
masonry, use concrete anchors (not provided).
HARDWARE
H3 (2)
Lag Screw
5/16"-9x1-5/8"
OPTION A WALL INSTALLATION
2.1A Center the bracket on the vertical
centerline with the bottom edge of the
bracket on the horizontal line as shown
(with the arrow pointing toward the
ceiling).
2.2A Mark the vertical set of bracket holes (do
not use the holes designated for ceiling
mount). Drill 3/16" pilot holes and fasten
the bracket securely to a structural
support with the hardware provided (H3).
OPTION B CEILING INSTALLATION
2.1B Extend the vertical centerline onto the
ceiling as shown.
2.2B Center the bracket on the vertical mark,
no more than 6" (15 cm) from the wall.
Make sure the arrow is pointing away
from the wall. The bracket can be
mounted flush against the ceiling when
clearance is minimal.
2.3B Mark the side holes. Drill 3/16" pilot holes
and fasten bracket securely to a structural
support with the hardware provided (H3).
UP
CEILING MOUNT ONLY
Wall Mount
Optional
Mounting
Holes
H3
Vertical
Centerline of
Garage Door
(Header Wall)
Header
Bracket
2x4 Structural
Support
Door Spring
(Garage Door)
Highest Point of
Garage Door
Travel
Horizontal
Line
The nail hole is for positioning
swercsgalesutsumuoY.ylno
.tekcarbredaehehttnuomot
UP
CEILING MOUNT ONLY
(Header Wall)
Ceiling Mounting Holes
(Finished Ceiling)
Vertical
Centerline of
Garage Door
Header
Bracket
6" (15 cm)
Maximum
Door Spring
(Garage Door)
H3
The nail hole is for positioning
swercsgalesutsumuoY.ylno
.tekcarbredaehehttnuomot
Installation
2 Install the Header Bracket

9
3.1 Align the rail with the header bracket.
Insert the clevis pin (H5) through the
holes in the header bracket and rail.
Secure with the ring fastener (H11).
NOTE: Use the packing material as a
protective base for the garage door opener.
H11
H5
HARDWARE
H5
Clevis Pin
5/16"x2-3/4"
H11
Ring Fastener
4Position the garage door opener
To prevent damage to garage door, rest garage
door opener rail on 2x4 placed on top section of
door.
4.1 Remove the packing material and lift the
garage door opener onto a ladder.
NOTE: A 2x4 is ideal for setting the distance
between the rail and the door. If the ladder is
not tall enough you will need help at this point.
4.2 Fully open the door and place a 2x4 (laid flat) under the rail.
NOTE: Ifthe door hits the trolley when it is raised, pull the trolley release arm down to
disconnect the inner and outer trolley. Slide the outer trolley toward the garage door opener.
The trolley can remain disconnected until instructed.
Connected Disconnected
3Attach the rail to the header bracket

10
To avoid possible SERIOUS INJURY from a
falling garage door opener, fasten it SECURELY to
structural supports of the garage. Concrete anchors MUST
be used if installing ANY brackets into masonry.
HARDWARE
H4 (2)
Lag Screw 5/16"- 18x1-5/8" H2 (2)
Hex Bolt 5/16"- 18x7/8"
H8 (2)
Nut 5/16"-18
H9 (2)
Lock Washer
5/16"-16
Hanging the garage door opener will vary
depending on your garage. Below are three
example installations. Your installation may be
different. For ALL installations the garage door
opener MUST be connected to structural
supports. The instructions illustrate one of the
examples below.
Finished Ceiling
Unfinished Ceiling
5.1 On finished ceilings, use the lag screws
(H3) to attach a support bracket (not
provided) to the structural supports
before installing the garage door opener.
Finished
Ceiling
H4
(not provided)
H4
5.2 Make sure the garage door opener is
aligned with the header bracket. Measure
the distance from each side of the garage
door opener to the support bracket.
5.3 Cut both pieces of the hanging bracket to
required lengths.
5.4 Attach the end of each hanging bracket to
the support bracket with appropriate
hardware (not provided).
(not provided)
5.5 Attach the garage door opener to the
hanging brackets with the bolts (H2), lock
washers (H9) and nuts (H8).
H2
H8
H9
5.6 Remove the 2x4 and manually close the
door. If the door hits the rail, raise the
header bracket.
Installation
5Hang the garage door opener

11
To prevent possible OVERHEATING of the end panel or light socket:
• Use ONLY A19 incandescent or compact fluorescent light bulbs.
• DO NOT use incandescent bulbs larger than 100W.
• DO NOT use compact fluorescent light bulbs larger than 26W (100W) equivalent.
• DO NOT use halogen bulbs.
• DO NOT use short neck or specialty light bulbs.
6.1 Pull on the top center of the light lens and
rotate the light lens down.
6.2 Insert an A19 incandescent or compact
fluorescent light bulb (100 watt maximum),
into the light socket.
6.3 Rotate the lens up to close.
NOTE: The use of short neck or speciality light
bulbs may overheat the end panel or light socket.
or or
7Attach the emergency release rope and handle
To prevent possible SERIOUS INJURY or DEATH from a falling garage door:
• If possible, use emergency release handle to disengage trolley ONLY when garage door is
CLOSED. Weak or broken springs or unbalanced door could result in an open door falling
rapidly and/or unexpectedly.
• NEVER use emergency release handle unless garage doorway is clear of persons and
obstructions.
• NEVER use handle to pull door open or closed. If rope knot becomes untied, you could fall.
7.1 Insert one end of the emergency release
rope through the handle. Make sure that
“NOTICE” is right side up. Tie a knot at
least 1 inch (2.5 cm) from the end of the
emergency release rope.
7.2 Insert the other end of the emergency
release rope through the hole in the
trolley release arm. Make sure the
handle is 6 feet (1.83 m) above the floor
and secure with a knot.
Trolley
Release Arm
NOTE: Ifit is necessary to cut the emergency release rope, seal the cut end with a match or lighter to prevent unraveling. Ensure the emergency release
rope and handle are above the top of all vehicles to avoid entanglement.
6Install the light bulbs

12
Fiberglass, aluminum or lightweight steel garage doors WILLREQUIRE reinforcement BEFORE
installation of door bracket. Contact your door manufacturer for reinforcement kit.
Figure 1 shows one piece of angle iron as the horizontal
brace. For the vertical brace, 2 pieces of angle iron are
used to create a U-shaped support. The best solution is to
check with your garage door manufacturer for an opener
installation door reinforcement kit.
NOTE: Many door reinforcement kits provide for direct
attachment of the clevis pin and door arm. In this case you
will not need the door bracket; proceed to the next step.
H10 (2)
Self-Threading Screw
1/4˝-14x5/8˝
HARDWARE
8.1 Center the door bracket on the previously marked vertical centerline used for the header bracket
installation. Note correct UP placement, as stamped inside the bracket.
8.2 Position the top edge of the bracket 2"-4" (5-10 cm) below the top edge of the door, OR directly below
any structural support across the top of the door.
8.3 Mark, drill holes and install as follows,depending on your door’s construction:
Metal or light weight doors using a vertical angle iron brace between the door panel support and
the door bracket:
• Drill 3/16" fastening holes. Secure the door bracket using the two self threading screws (H10).
(Figure 2)
• Alternately, use two 5/16" bolts, lock washers and nuts (not provided). (Figure 3)
Metal, insulated or light weight factory reinforced doors:
• Drill 3/16" fastening holes. Secure the door bracket using the self-threading screws (H10).
(Figure 4)
Wood Doors:
• Use top and bottom or side to side door bracket holes. Drill 5/16” holes through the door and
secure bracket with 5/16"x2" carriage bolts, lock washers and nuts (not provided). (Figure 5)
NOTE: The 1/4"-14x5/8" self-threading screws are not intended for use on wood doors.
8Install the door bracket
A horizontal and vertical reinforcement is
needed for lightweight garage doors
(fiberglass, aluminum, steel, doors with glass
panel, etc.) (not provided).
A horizontal reinforcement brace should be
long enough to be secured to two or three
vertical supports. A vertical reinforcement
brace should cover the height of the top panel.
Door
Bracket
Vertical
Centerline
of Garage Door
UP
Vertical
Reinforcement
FIGURE 2
H10
UP
H10
Vertical
Centerline
of Garage
Door
FIGURE 4
FIGURE 1
Door
Bracket
Nut
5/16"-18
Bolt
5/16"-18x2"
(Not Provided)
Lock Washer
5/16"
UP
Vertical Reinforcement
FIGURE 3
Vertical
Centerline
of Garage Door
UP
Inside Edge
of Door or
Reinforcement Board
Bolt 5/16"x2"
(Not Provided)
FIGURE 5
Vertical
Centerline
of Garage
Door
Installation

13
IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm.
Straight
Door Arm Curved
Door
Arm
(Groove
facing out)
CORRECT
INCORRECT
Straight
Door
Arm Curved
Door
Arm
9.1 Close the door. Disconnect the trolley by
pulling the emergency release handle.
Slide the outer trolley back (away from
the door) about 2" (5 cm).
9.2 Attach the straight door arm to the outer
trolley using the clevis pin (H7). Attach
with the ring fastener (H11).
H11 H7
9.3 Attach the curved door arm to the door
bracket using the clevis pin (H6).
Attach with the ring fastener (H11).
H11
H6
HARDWARE
H2 (2)
Hex Bolt 5/16"-18x7/8"
H8 (2)
Nut
5/16"-18
H9 (2)
Lock
Washer
5/16" -16
H7
Clevis Pin
5/16"x1"
H6
Clevis Pin 5/16"x1-1/4"
H11 (2)
Ring Fastener
9.4 Align the straight door arm with the
curved door arm. Select two aligned
holes (as far apart as possible) and
attach using the bolts (H2), nuts (H8)
and lock washers (H9).
H8
H9
H2
NOTE: If the holes do not line up, reverse the
straight door arm. Select two aligned holes (as
far apart as possible) and attach using the bolts
(H2), nuts (H8) and lock washers (H9).
.
H8
H9
H2
If the straight door arm is hanging
down too far, you may cut 6 inches
(15 cm) from the solid end.
9.5 Pull the emergency release handle
toward the garage door opener until the
trolley release arm is horizontal. The
trolley will re-engage automatically when
the garage door opener is activated.
Trolley
release arm
9 Connect the door arm to the trolley

14
1Install the door control
Install the Door Control
To prevent possible SERIOUS INJURY or DEATH from electrocution:
• Be sure power is NOT connected BEFORE installing door control.
• Connect ONLY to 24 VOLT low voltage wires.
To prevent possible SERIOUS INJURY or DEATH from a closing garage door:
• Install door control within sight of garage door, out of reach of children at a minimum height of 5 feet
(1.5 m), and away from ALL moving parts of door.
• NEVER permit children to operate or play with door control push buttons or remote control
transmitters.
• Activate door ONLY when it can be seen clearly, is properly adjusted, and there are no
obstructions to door travel.
• ALWAYS keep garage door in sight until completely closed. NEVER permit anyone to cross path of
closing garage door.
INTRODUCTION
Compatible with MyQ™ and Security+®2.0
accessories. NOTE:Older LiftMaster
accessories and third party products are not
compatible.Your garage door opener is
compatible with up to 2 Smart Control Panels or
4 of any other Security+®2.0 door controls.
Install the door control within sight of the door at
a minimum height of 5 feet (1.5 m) where small
children cannot reach, and away from the
moving parts of the door.
NOTE: Your product may look different than
moving parts of the door the illustrations.
H14 (2)
Screw
6ABx1-1/4"
HARDWARE
H16 (2)
Drywall
Anchors
H15 (2)
Screw
6-32x1"
NOTE: For gang box installations it is not necessary to drill holes or install the drywall anchors. Use the existing holes in the gang box.
1.1 Strip 7/16 inch (11 mm) of insulation from
one end of the wire and separate the wires.
7/16"
(11 mm)
1.2 Connect one wire to each of the two screws
on the back of the door control. The wires
can be connected to either screw.
PRE-WIREDINSTALLATIONS:Choose
any two wires to connect, note which wires
are used so the correct wires are connected
at the garage door opener in a later step.
1.3 Mark the location of the bottom mounting
hole and drill a 5/32 inch (4 mm) hole.
Wall
1.4 Install the bottom screw,allowing 1/8 inch
(3 mm) to protrude from the wall.
H15
DRYWALL
GANG BOX
H14
H16

15
k
Install the Door Control
1.5 Position the bottom hole of the door
control over the screw and slide
down into place.
1.6 Lift the push bar up and mark the top hole. 1.7 Remove the door control from the wall
and drill a 5/32 inch (4 mm) hole for
the top screw.
1.8 Position the bottom hole of the
door control over the screw and
slide down into place. Attach the
top screw.
DRYWALL
H14
H16
H15
GANG BOX
2Wire the door control to the garage door opener
HARDWARE
H17 (10)
Insulated Staple
PRE-WIRED INSTALLATIONS: When wiring
the door control to the garage door opener
make sure you use the same wires that are
connected to the door control.
2.1 Run the white and red/white wire from the door control to
the garage door opener. Attach the wire to the wall and
ceiling with the staples (H17) (not applicable for gang box
or pre-wired installations). Do not pierce the wire with the
staple as this may cause a short or an open circuit.
H17
2.2 Strip 7/16 inch (11 mm) of insulation
from the end of the wire near the
garage door opener.
7/16"
(11 mm)
2.3 Connect the wire to the red and
white terminals on the garage
door opener. To insert or
release wires from the terminal,
push in the tab with screwdriver
tip.
RED
WHITE
WHITE
GREY
WHI
WHITE
E

16
3Attach the warning labels
Install the Door Control
3.1 Attach the entrapment warning label on the wall near the door control with tacks or
staples.
3.2 Attach the manual release/safety reverse testlabel in a visible location on the inside of
the garage door.

17
Introduction
Be sure power is NOT connected to the garage
door opener BEFORE installing the safety
reversing sensor.
To prevent SERIOUS INJURY or DEATH from
closing garage door:
• Correctly connect and align the safety
reversing sensor. This required safety
device MUST NOT be disabled.
• Install the safety reversing sensor so beam
is NO HIGHER than 6" (15 cm) above
garage floor.
Install the Protector System®
IMPORTANTINFORMATIONABOUTTHESAFETYREVERSINGSENSORS
The safety reversing sensors must be connected and aligned correctly before the garage door opener will move in the down direction.
The sending sensor (with an amber LED) transmits an invisible light beam to the receiving sensor (with a green LED). If an obstruction breaks the light
beam while the door is closing, the door will stop and reverse to the full open position, and the garage door opener lights will flash 10 times.
NOTE: For energy efficiency the garage door opener will enter sleep mode when the door is fully closed. The sleep mode shuts the garage door
opener down until activated. The sleep mode is sequenced with the garage door opener light bulb; as the light bulb turns off the sensor LEDs will turn
off and whenever the garage door opener lights turn on the sensor LEDs will light. The garage door opener will not go into the sleep mode until the
garage door opener has completed 5 cycles upon power up.
When installing the safety reversing sensors check the following:
• Sensors are installed inside the garage, one on either side of the door.
• Sensors are facing each other with the lenses aligned and the receiving sensor lens does not receive direct sunlight.
• Sensors are no more than 6 inches (15 cm) above the floor and the light beam is unobstructed.
Invisible Light Beam
Protection Area
Safety Reversing Sensor
6" (15 cm) max. above floor Safety Reversing Sensor
6" (15 cm) max. above floor

Install the Protector System®
1Install 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
H12 (2)
Carriage Bolt
1/4"-20x1/2"
H13 (2)
Wing Nut
1/4"-20
OPTION A DOOR TRACK INSTALLATION
1.1A Slide the curved arms of the sensor
bracketaround 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 (H12) into the
slot on each sensor.
H12
1.3A Insert the bolt through the hole in the sensor
bracket and attach with the wing nut (H13). The
lenses on both sensors should point toward
each other. Make sure the lens is not obstructed
by the sensor bracket.
H13
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).
Inside
Garage
Wall
(not provided)
1.3B Slide the carriage bolt (H12) into the
slot on each sensor.
H12
Lens
1.4B Insert the bolt through the hole in the sensor
bracket and attach with the wing nut (H13). The
lenses on both sensors should point toward
each other. Make sure the lens is not
obstructed by the sensor bracket.
H13
18

Install the Protector System®
1 Install the Safety Reversing Sensors
OPTION C FLOOR INSTALLATION
Use an extension bracket (not provided) or wood black to raise the sensor bracket if needed.
1.1C Carefully measure the position of both
sensor brackets so they will be the same
distance from the wall and unobstructed.
1.2C Attach the sensor brackets to the floor
using concrete anchors (not
provided).
Inside
Garage
Wall
(not provided)
1.3C Slide the carriage bolt (H12) into the
slot on each sensor.
H12
1.4C Insert the bolt through the hole in the sensor
bracket and attach with the wing nut (H13). The
lens on both sensors should point toward each
other. Make sure the lens is not obstructed by
the sensor bracket.
H13
2 Wire the Safety Reversing
Sensors OPTION A INSTALLATION WITHOUT PRE-WIRING
PRE-WIRED INSTALLATIONS: If your garage
already has wires installed for the safety
reversing sensors,refer to the instructions on the
following page.
HARDWARE
H17 (10)
Insulated Staple
2.1A Run the wire from both sensors to the
garage door opener. Attach the wire to
the wall and ceiling with the staples
(H17).
H17
2.2A Strip 7/16 inch (11 mm) of insulation
from each set of wires. Separate the
wires. Twist the white wires together.
Twist the white/black wires together.
7/16"
(11 mm)
2.3A Insert the white wires into the white terminal on
the garage door opener. Insert the white/black
wires into the grey terminal on the garage door
opener. To insert or remove the wires from the
terminal, push in the tab with a screwdriver tip.
RED
WHITE
WHITE
GREY
D
RED
W
RE
GR
GREY
WH
WHIT
19

Install the Protector System®
OPTION B PRE-WIRED INSTALLATION
2.1B Cut the end of the safety
reversing sensor wire, making
sure there is enough wire to
reach the pre-installed wires
from the wall.
2.2B Separate the safety reversing sensor wires and strip 7/16 inch (11 mm) of
insulation from each end. Choose two of the pre-installed wires and strip 7/16
inch (11 mm) of insulation from each end. Make sure that you choose the
same color pre-installed wires for each sensor.
7/16"
(11 mm)
7/16"
(11 mm)
Safety reversing sensor wires
Pre-installed
wires
2.3B Connect the pre-installed wires to the sensor wires with wire nuts
making sure the colors correspond for each sensor. For example,
the white wire would connect to the yellow wire and the white/black
wire would connect to the purple wire.
White
White/Black
Yellow
(for example)
Purple
(for example)
Not Provided
Pre-installed
wires
Safety reversing sensor wires
2.4B At the garage door opener, strip 7/16 inch (11 mm) of insulation from each end of the wires previously chosen for the
safety reversing sensors. Twist the like-colored wires together.
7/16"
(11 mm)
Yellow
Purple
2.5B Insert the wires connected to the white safety sensor wires to the
white terminal on the garage door opener. Insert the wires that are
connected to the white/black safety sensor wires to the grey
terminal on the garage door opener.
RED
WHITE
WHITE
GREY
D
W
RED
RE
GR
GREY
WH
WHIT
Purple
(for example)
Yellow
(for example)
To insert or remove the wires
from the terminal, push in the
tab with a screwdriver tip.
20