Chamberlain 8550 User manual

CONTENTS
Preparation. . . . . . . . . . . . . . . .2-3
Assembly . . . . . . . . . . . . . . . . .4-5
Installation . . . . . . . . . . . . . . .6-13
Install the Door Control. . . . . . 14-15
Install the Protector System®. . 16-19
Power. . . . . . . . . . . . . . . . . . 20-21
Adjustments . . . . . . . . . . . . . 22-24
Battery Backup*. . . . . . . . . . . 25-26
Operation . . . . . . . . . . . . . . . . . 27
Features . . . . . . . . . . . . . . . . . . 28
Door Control . . . . . . . . . . . . . 29-30
Remote Control . . . . . . . . . . . 31-32
To Erase the Memory . . . . . . . . . 32
To Open the Door Manually . . . . . 33
Maintenance . . . . . . . . . . . . . . . 34
Troubleshooting. . . . . . . . . . . 35-36
Accessories. . . . . . . . . . . . . . . . 37
Warranty. . . . . . . . . . . . . . . . . . 38
Repair Parts . . . . . . . . . . . . . 39-41
* If applicable
ELITE Series
Garage Door Opener
LiftMaster
845 Larch Avenue
Elmhurst, Illinois 60126-1196
■ 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.
NOTE: If you are installing the garage door opener on a one-piece door, visit
www.LiftMaster.com for installation instructions.
www.LiftMaster.com
Serial Number:
Date of Purchase:
Models
• 8550 - DC Belt Drive
with Battery Backup
• 8557 - 3/4 hp
Belt Drive
FOR RESIDENTIAL USE ONLY
Write down the following information for
future reference:
.

2
Safety Symbol and Signal Word
Review
Thisgarage door opener hasbeen designed and
tested to offer safe service provided itis installed,
operated,maintained and tested in strict
accordance with the instructionsand warnings
contained in this manual.
When you see these Safety Symbols and Signal
Words on the following pages, they will alertyou 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 thisSignal 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
To prevent possible SERIOUSINJURYor
DEATH:
lALWAYS call a trained door systems
technician if garage door binds,sticks,
or isout ofbalance.An unbalanced
garage door may NOT reverse when
required.
lNEVER tryto loosen,move or adjust
garage door,door springs, cables,
pulleys,brackets or their hardware,
ALLof which are under EXTREME
tension.
lDisable ALLlocks and remove
ALLropesconnected to garage door
BEFORE installation and operating
garage door opener to avoid
entanglement.
To preventdamage to garage door and
opener:
lALWAYS disable locks BEFORE
installing and operating the opener.
lONLY operate garage door opener at
120V, 60Hzto avoid malfunction and
damage.
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. Ifyour door binds,
sticks, or is out of balance, call a trained
door systems technician.
4. Check the seal on the bottom ofthe 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 ofthe door. Ifthere 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 leftor right of
the door center.See page 7.
Torsion
Spring
Extension
Spring
OR
Tools Needed
2
1
3/16
7/16
1/2
5/32
5/16
5/8
9/16
1/4
7/16
Preparation

3
Carton Inventory
Accessorieswill 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 notincluded in this manual. The images
throughout this manual are for reference and your product may look different.
A. Header bracket
B. Pulley and bracket
C. Door bracket
D. Curved door arm
E. Straight door arm
F. Trolley
G. Emergency release rope and handle
H. Rail
I. Garage door opener
J. Sprocket cover with hex screws
K. Belt
L. Door control
M. White and red/white wire
N. The Protector System®
Safety reversing sensorswith white and white/blackwire attached: Sending Sensor (1)
Receiving Sensor (1) and SafetySensor Brackets (2)
O. Safety labels and literature
P. Rail grease
Security+ 2.0™ Accessories
880LM
Smart Control Panel®
895MAX
Remote Control
Installation Hardware
Hex bolt 5/16"-18 x 7/8" (4) Lock washer 5/16" (4)
Lag screw 5/16"-9 x 1-5/8" (2) Self-threading screw1/4"-14 x 5/8" (2)
Clevis pin 5/16" x 2-3/4" (1) Ring fastener (3)
Clevis pin 5/16" x 1-1/4" (1) Carriage bolt 1/4"-20 x 1/2" (2)
Clevis pin 5/16" x1" (1) Wing nut 1/4"-20 (2)
Nut 5/16"-18 (4)
Door Control Hardware
Screw 6AB x 1" (2)
Screw 6-32 x 1" (2)
Drywall anchors (2)
Insulated staples
AB
C
J
N
I
OP
DE
F
H
G
K
L
M
Not Provided
Not
Provided
Preparation

4
Assembly
1 Attach the Rail to the Garage Door Opener
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
lALWAYS keep hand clear of sprocketwhile operating opener.
lSecurely 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.
NOTE: ONLY use the boltsremoved from the garage door opener. Place the garage door opener on
the packing material to prevent scratching.
1. Model 8550: Remove the two boltsfrom the top of the garage door opener.
Model 8557:Remove boltand lock nut from the top ofthe garage door opener.
2. Align the rail and the styrofoam over the sprocket.Cut the tape from the rail, belt, and
styrofoam.
3. Model 8550: Fasten the rail with the previouslyremoved bolts.
Model 8557: Fasten the rail with the previouslyremoved washered boltand lock nut.
4. Position the beltaround the garage door opener sprocket.
5. Attach the sprocket cover over the garage door opener sprocket and attach with hex screws.
Model 8550
Model 8557
Washered Bolt
5/16"-18x1/2"
Hex Screw
#8x3/8"
Lock Nut
Washered Bolt 5/16"-18x1/2"
(Mounted in the garage
door opener)
Model 8550 (2)
Model 8557 (1)
Hex Screw
#8x3/8"
(Packed with the
sprocket cover)
Lock Nut
(Mounted in the
garage door opener)
Model 8557 (1)
Washered Bolt
5/16"-18x1/2"
Hex Screw
#8x3/8"
HARDWARE

5
Assembly
2 Tighten the Belt
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.
2. Insert a flathead screwdriver tip into one ofthe nut ring slotsand brace itfirmlyagainstthe
trolley.
3. Tighten the spring trolley nutwith an adjustable wrench or a 7/16" open end wrench about a
quarter turn until the spring releases and snaps the nut ring againstthe trolley. This sets the
spring to optimum belt tension.
Spring Trolley Nut
(To motor unit)
Nut ring
slot
Nut Ring Nut Ring
AFTER RELEASE
1-1/4"
(3.18 cm)
BEFORE
1"
(2.5 cm)
1
2
3

6
Installation
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 properlybalanced and lubricated garage door.An
improperly balanced door may NOT reverse when required and could resultin SEVERE
INJURY or DEATH.
3. ALL repairsto cables,spring assemblies and other hardware MUST be made by a trained
door systemstechnician BEFORE installing opener.
4. Disable ALL locks and remove ALL ropesconnected 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, butat 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 caughtin garage door or opener mechanisms.
9. Install wall-mounted garage door control:
lwithin sight of the garage door.
lout of reach of children at minimum height of 5 feet (1.5 m).
laway from ALL moving parts of the door.
10. Place entrapment warning label on wall next to garage door control.
11. Place manual release/safetyreverse testlabel in plain view on inside ofgarage 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 flat) 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 functionalityif 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.

7
Installation
1 Determine the Header Bracket Location
To preventpossible SERIOUS INJURY or DEATH:
lHeader bracketMUST be RIGIDLY fastened to structural supporton header wall or ceiling,
otherwise garage door mightNOT reverse when required. DO NOT install header bracket
over drywall.
lConcrete anchors MUST be used ifmounting header bracket or 2x4 into masonry.
lNEVER try to loosen, move or adjust garage door, springs, cables, pulleys, brackets, or their
hardware, ALL of which are under EXTREME tension.
lALWAYS call a trained door systemstechnician if garage door binds,sticks,or isout of
balance.An unbalanced garage door might NOT reverse when required.
lDO 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.
Close the door and mark the inside vertical centerline of the garage door.
Extend the line onto the header wall above the door. You can fasten the header bracketwithin 4 feet
(1.22 m) of the leftor right ofthe door center only ifa torsion spring or center bearing plate is in the way;
or you can attach itto the ceiling when clearance is minimal. (Itmaybe 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 (notprovided) to securelyfasten the 2x4 to structural supports.
Open your door to the highest point of travel asshown. Draw an intersecting horizontal line on the
header wall 2" (5 cm) above the high point.This heightwill provide travel clearance for the top edge of
the door.
NOTE: If the total number of inches exceeds the height available in your garage, use the maximum
height possible, or refer to page 8 for ceiling installation.
Header Wall
Unfinished
Ceiling
Vertical Centerline
of Garage Door
2x4
2x4
Structural
Supports
Level
(Optional)
OPTIONAL
CEILING
MOUNT FOR
HEADER
BRACKET
Sectional door with curved track
Header Wall
Track
2" (5 cm)
Highest Point
of Travel
Door

8
Installation
2 Install the Header Bracket
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.Donot installthe headerbracket over
drywall. If installing into masonry, use concrete anchors (not provided).
HARDWARE
Lag Screw 5/16"-9x1-5/8"
OPTION A WALL INSTALLATION
1. Center the bracket on the vertical centerline with the bottomedge of the bracket on the
horizontal line asshown (with the arrow pointing toward the ceiling).
2. Mark the vertical set ofbracket holes (do not use the holes designated for ceiling mount).Drill
3/16" pilot holes and fasten the bracket securely to a structural supportwith lag screws.
Wall Mount
Optional
Mounting
Holes
Vertical
Centerline of
Garage Door
(Header Wall)
Header
Bracket
2x4 Structural
Support
Door Spring
(Garage Door)
Highest Point of
Garage Door
Travel
Horizontal
Line
Lag Screw
5/16" - 9 x 1-5/8"
OPTION B CEILING INSTALLATION
1. Extend the vertical centerline onto the ceiling asshown.
2. Center the bracket on the vertical mark,no more than 6" (15 cm) from the wall.Make sure the
arrow is pointing toward the wall. The bracket can be mounted flush against the ceiling when
clearance is minimal.
3. Mark the side holes.Drill 3/16" pilot holes and fasten bracketsecurely to a structural support
with lag screws.
(Header Wall)
Ceiling Mounting Holes
(Finished Ceiling)
Vertical
Centerline of
Garage Door
Header
Bracket
6" (15 cm)
Maximum
Door Spring
(Garage Door)
Lag Screw
5/16" - 9 x 1-5/8"

9
Installation
3 Attach the Rail to the Header Bracket
1. Align the rail with the header bracket.Insertthe clevis pin through the holes in the header
bracket and rail. Secure with the ring fastener.
NOTE: Use the packing material as a protective base for the garage door opener.
Ring
Fastener
Clevis Pin
5/16" X 2-3/4"
HARDWARE
Clevis Pin 5/16" x 2-3/4" Ring Fastener
4 Position the Garage Door Opener
To preventdamage to garage door,restgarage door opener rail on 2x4 placed on top section of
door.
1. Remove the packing material and lift the garage door opener onto a ladder.
2. Fullyopen the door and place a 2x4 (laid flat) under the rail.
A 2x4 isideal for setting the distance between the rail and the door.If the ladder is nottall enough you
will need help at this point.Ifthe door hits the trolley when it israised, 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

10
Installation
5 Hang the Garage Door Opener
To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it SECURELY to
structural supportsofthe garage. Concrete anchorsMUST be used ifinstalling ANY bracketsinto
masonry.
Hanging your garage door opener will varydepending on your garage.Two representative installations
are shown.Yours may be different.Hanging bracketsshould be angled (Figure 1) to provide rigid
support.On finished ceilings(Figure 2),attach a sturdy metal bracketto structural supportsbefore
installing the opener. This bracket and fastening hardware are not provided.
1. Measure the distance from each side of the motor unit to the structural support.
2. Cutboth pieces ofthe hanging bracket to required lengths.
3. Drill 3/16" pilot holes in the structural supports.
4. Attach one end of each bracketto a support with 5/16"-18x1-7/8" lag screws (notprovided).
5. Fasten the opener to the hanging bracketswith 5/16"-18x7/8" hex bolts,lock washers and
nuts.
6. Check to make sure the rail is centered over the door (or in line with the header bracket ifthe
bracket isnot centered above the door).
7. Remove the 2x4.Operate the door manually.Ifthe door hitsthe rail, raise the header bracket.
NOTE: DO NOT connect power to opener at this time.
FIGURE 1 FIGURE 2
(Not Provided)
Lag Screws
5/16"- 18x1-7/8"
Measure
Distance
Hex Bolt 5/16"- 18x7/8", Lock Washer 5/16", Nut 5/16"-18
FIGURE 3
Not Provided
Finished Ceiling
Unfinished Ceiling
Hex Bolt 5/16"- 18x7/8" Nut 5/16"-18Lock Washer 5/16"
HARDWARE

11
Installation
6 Install the Light Bulbs
To preventpossible OVERHEATING of the end panel or light socket:
lUse ONLY A19 incandescent (100Wmaximum) or compact fluorescent (26Wmaximum)
light bulbs.
lDO NOT use incandescent bulbs larger than 100W.
lDO NOT use compact fluorescent light bulbs larger than 26W (100W equivalent).
lDO NOT use halogen bulbs.
lDO NOT use short neck or specialty light bulbs.
1. Pull on the top center of the light lens and rotate the light lens down.
2. Insert an A19 incandescent (100W maximum) or compact fluorescent (26W, 100Wequivalent)
lightbulb into the light socket.
NOTE: DO NOT use halogen, short neck, or specialty light bulbs as these may overheat the end panel
or light socket. DO NOT use LED bulbs as they may reduce the range or performance of your remote
control(s).
3. Rotate the lens up to close.
or or
7 Attach the Emergency Release Rope and Handle
To preventpossible SERIOUS INJURY or DEATH from a falling garage door:
lIf possible, use emergency release handle to disengage trolley ONLY when garage door is
CLOSED. Weak or broken springs or unbalanced door could resultin an open door falling
rapidlyand/or unexpectedly.
lNEVER use emergency release handle unless garage doorway is clear of persons and
obstructions.
lNEVER use handle to pull door open or closed.If rope knot becomes untied,you could fall.
1. Insert one end ofthe emergency release rope through the handle.Make sure that “NOTICE” is
rightside up. Tie a knotatleast1 inch (2.5 cm) fromthe end of the emergency release rope.
2. Insert the other end of the emergency release rope through the hole in the trolley release arm.
Mount the emergency release within reach, butat least6 feet (1.83m) above the floor,
avoiding contact with vehicles to prevent accidental release and secure with a knot.
NOTE: If it 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.
Trolley
Release Arm

12
Installation
8 Install the Door Bracket
Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE
installation of door bracket. Contactthe garage door manufacturer or installing dealer for opener
reinforcementinstructions or reinforcement kit. Failure to reinforce the top section as required
according to the door manufacturer may void the door warranty.
A horizontal and vertical reinforcement isneeded for
lightweight garage doors (fiberglass, aluminum, steel,
doors with glass panel, etc.) (not provided). A horizontal
reinforcementbrace should be long enough to be secured
to two or three vertical supports. A vertical reinforcement
brace should cover the heightofthe top panel. Contactthe
garage door manufacturer or installing dealer for opener
reinforcement instructions or 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 nextstep.
SECTIONALDOORS
1. Center the door bracketon the previously marked vertical centerline used for the header
bracket installation. Note correct UP placement, as stamped inside the bracket.
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.
3. Mark, drill holes and install as follows, depending on your door’s construction:
Metal orlight weight doors usinga vertical angle iron brace between the doorpanelsupport and the
door bracket:
lDrill 3/16" fastening holes. Secure the door bracket using the two self threading screws.
(Figure1)
lAlternately, use two 5/16" bolts, lock washers and nuts (not provided). (Figure2)
Metal, insulated or light weight factory reinforced doors:
lDrill 3/16" fastening holes. Secure the door bracket using the self-threading screws. (Figure3)
Wood Doors:
lUse top and bottom or side to side door bracket holes.Drill 5/16” holesthrough the door and
secure bracket with 5/16"-18x2" carriage bolts, lock washers and nuts (not provided).
(Figure4)
NOTE: The 1/4"-14x5/8" self-threading screws are not intended for use on wood doors.
FIGURE 1
FIGURE 3
Vertical Reinforcement
Vertical Centerline
of Garage Door
UP
Door Bracket Self-Threading Screw
1/4" - 14x 5/8"
Self-Threading
Screw
1/4" - 14x 5/8"
Vertical Centerline
of Garage Door
UP
FIGURE 4
Vertical
Centerline of
Garage Door
Bolt 5/16"-18x2"
(Not provided)
UP
Inside Edge of Door or
Reinforcement Board
FIGURE 2
Vertical Reinforcement
Bolt 5/16"-18x2"
(Not provided)
Lock Washer 5/16"
Nut 5/16"-18
Door Bracket
UP
Vertical
Centerline
of Garage Door
Self-Threading Screw
1/4"-14x5/8"
HARDWARE

13
Installation
9 Connect the Door Arm to the Trolley
IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm.
1. Close the door. Disconnectthe trolleyby pulling the emergency release handle. Slide the
outer trolley back (away from the door) about 2" (5 cm).
2. Attach the straight door arm to the outer trolley using the clevis pin.Attach with the ring
fastener.
3. Attach the curved door arm to the door bracket using the clevis pin.Attach with the ring
fastener.
4. Align the straightdoor arm with the curved door arm. Selecttwo aligned holes (as far apart as
possible) and attach using the bolts,nutsand lock washers.
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,nuts and lock washers.
5. Pull the emergency release handle toward the garage door opener until the trolley release
arm ishorizontal. The trolley will re-engage automatically when the garage door opener is
activated.
Straight
Door Arm Curved
Door
Arm
(Groove
facing
out)
CORRECT
Straight
Door
Arm Curved
Door
Arm
INCORRECT
Clevis Pin 5/16"x1-1/4"
Ring Fastener
Clevis Pin
5/16"x1"
Nut 5/16" - 18
Lock
Washer
5/16"
Hex Bolt
5/16" - 18 x 7/8"
HARDWARE
Hex Bolt 5/16"-18x7/8"
Nut 5/16"-18
Lock Washer 5/16"
Clevis Pin 5/16"x1"
Clevis Pin 5/16"x1-1/4"
Ring Fastener

14
Install the Door Control
1 Install the Door Control
To preventpossible SERIOUS INJURY or DEATH from electrocution:
lBe sure power is NOT connected BEFORE installing door control.
lConnectONLY to 12 VOLT low voltage wires.
To preventpossible SERIOUS INJURY or DEATH from a closing garage door:
lInstall 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.
lNEVER permitchildren to operate or play with door control push buttons or remote control
transmitters.
lActivate door ONLY when it can be seen clearly,isproperly adjusted, and there are no
obstructions to door travel.
lALWAYS 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, see page 37.Your garage door opener is
compatible with up to 2 SmartControl Panels or 4 of anyother Security+2.0™ door controls.
NOTE:Older LiftMaster door controls and third party products are not compatible.
Install the door control within sightof the door ata minimum height of5 feet (1.5 m) where small children
cannot reach, and away from the moving parts of the door. For gang box installations it is not necessary
to drill holes or install the drywall anchors.Use the existing holes in the gang box.
NOTE: Your product may look different than the illustrations.
HARDWARE
Screw
6ABx1" (2)
Drywall
Anchors (2)
Screw
6-32x1" (2)
1. Strip 7/16 inch (11 mm) ofinsulation from one end ofthe wire and separate the wires.
2. Connectone wire to each of the two screwson the backofthe door control.The wires can be
connected to either screw.
PRE-WIREDINSTALLATIONS:Choose anytwo wires to connect, note which wires are used
so the correct wires are connected at the garage door opener in a later step.
3. Mark the location of the bottom mounting hole and drill a 5/32 inch (4 mm) hole.
4. Install the bottom screw,allowing 1/8 inch (3 mm) to protrude fromthe wall.
5. Position the bottom hole of the door control over the screw and slide down into place.
6. Liftthe push bar up and markthe top hole.
7. Remove the door control from the wall and drill a 5/32 inch (4 mm) hole for the top screw.
8. Position the bottom hole of the door control over the screw and slide down into place.Attach
the top screw.
7/16" (11 mm) Wall
1 2 3
DRYWALL GANG BOX
6ABx1"
6-32x1"
Drywall Anchor
4-5 6
6-32x1"
GANG BOX
8 DRYWALL
6ABx1"
Drywall Anchor
7

15
Install the Door Control
2 Wire the door control to the garage door opener
HARDWARE
Insulated Staple
(Not shown)
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.
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 (not applicable for gang box or pre-wired
installations).Do not pierce the wire with the staple as thismay cause a short or an open
circuit.
2. Strip 7/16 inch (11 mm) ofinsulation from the end ofthe wire near the garage door opener.
3. Connectthe wire to the red and white terminals on the garage door opener. To insertor
release wires from the terminal, push in the tab with screwdriver tip.
7/16" (11 mm)
2
3
1
Staple
RED WHITE WHITE GREY
3 Attach the warning labels
1. Attach the entrapment warning label on the wall near the door control with tacks or staples.
2. Attach the manual release/safety reverse test label in a visible location on the inside of the
garage door.

16
Install the Protector System®
Introduction
Be sure power is NOT connected to the garage door opener BEFORE installing the safety reversing
sensor.
To preventSERIOUS INJURY or DEATH from closing garage door:
lCorrectly connect and align the safety reversing sensor. This required safety device MUST
NOT be disabled.
lInstall the safety reversing sensor so beam isNO HIGHER than 6" (15 cm) above garage
floor.
IMPORTANT INFORMATION ABOUT THE SAFETY REVERSING SENSORS
The safety reversing sensors must be connected and alignedcorrectly 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). Ifan obstruction breaksthe 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 LEDswill light. The garage door opener
will not go into the sleep mode until the garage door opener has completed 5 cycles upon power up.
Wheninstallingthe safety reversing sensors check the following:
lSensors are installed inside the garage, one on either side of the door.
lSensors are facing each other with the lensesaligned and the receiving sensor lens does not
receive direct sunlight.
lSensors 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

17
Install the Protector System®
1 Install the Safety Reversing Sensors
HARDWARE
Carriage Bolt
1/4"-20x1/2" Wing Nut
1/4"-20
The safetyreversing sensors can be attached to the door track,the wall, or the floor.If the door track will
not support the sensor bracketa wall installation is recommended. Choose one of the following
installations.
OPTION A DOOR TRACK INSTALLATION
1. Slide the curved arms of the sensor bracketaround the edge of the door track.Snap into place
so that the sensor bracket is flush againstthe track.
2. Slide the carriage bolt into the slot on each sensor.
3. Insert the bolt through the hole in the sensor bracket and attach with the wing nut. The lenses
on both sensors should point toward each other. Make sure the lens is not obstructed by the
sensor bracket.
No more
than 6 inches
(15 cm) Carriage Bolt
1/4"-20x1/2"
Wing Nut
1/4"-20
123
OPTION B WALLINSTALLATION
If additional clearance is needed an extension bracket(notprovided) or wood blocks can be used. Make
sure each brackethas the same amount ofclearance so they will align correctly.
1. Position the sensor bracketagainst the wall with the curved arms facing the door. Make sure
there is enough clearance for the beam to be unobstructed. Mark holes.
2. Drill 3/16 inch pilotholes for each sensor bracketand attach the sensor bracketsto the wall
using lag screws(not provided).
3. Slide the carriage bolt into the slot on each sensor.
4. Insert the bolt through the hole in the sensor bracket and attach with the wing nut. The lenses
on both sensors should point toward each other. Make sure the lens is not obstructed by the
sensor bracket.
(Not provided)
No more than
6 inches (15 cm)
12
Inside
Garage
Wall
(Not provided)
Lens
Carriage Bolt
1/4"-20x1/2"
Wing Nut
1/4"-20
34

18
Install the Protector System®
OPTION C FLOOR INSTALLATION
Use an extension bracket(not provided) or wood block to raise the sensor bracket if needed.
1. Carefullymeasure the position of both sensor brackets so they will be the same distance from
the wall and unobstructed.
2. Attach the sensor brackets to the floor using concrete anchors(notprovided).
3. Slide the carriage bolt into the slot on each sensor.
4. Insert the bolt through the hole in the sensor bracket and attach with the wing nut. The lens on
both sensors should pointtoward each other.Make sure the lens is not obstructed by the
sensor bracket.
Inside
Garage
Wall
(Not provided)
1 2
Carriage Bolt
1/4"-20x1/2"
Wing Nut
1/4"-20
34
2 Wire the Safety Reversing Sensors
PRE-WIRED INSTALLATIONS: If your garage already has wires installed for the safety reversing
sensors, see page 18.
HARDWARE
Insulated Staple
(Not shown)
OPTION A INSTALLATION WITHOUT PRE-WIRING
1. Run the wire from both sensorsto the garage door opener. Attach the wire to the wall and
ceiling with the staples.
2. Strip 7/16 inch (11 mm) ofinsulation from each setof wires.Separate the wires. Twistthe white
wires together. Twist the white/black wires together.
3. Insert the white wiresinto the white terminal on the garage door opener.Insert the white/black
wires into the greyterminal on the garage door opener. To insertor remove the wiresfrom the
terminal,push in the tab with a screwdriver tip.
Staple
1 2
3
7/16" (11 mm)
RED
WHITE
WHITE
GREY
D
RED
W
RE
WHITE
WHITE
GREY
GREY

19
Install the Protector System®
OPTION B PRE-WIRED INSTALLATION
1. Cutthe end ofthe safetyreversing sensor wire, making sure there is enough wire to reach the
pre-installed wires from the wall.
2. Separate the safety reversing sensor wires and strip 7/16 inch (11 mm) ofinsulation 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.
3. Connectthe pre-installed wires to the sensor wires with wire nutsmaking sure the colors
correspond for each sensor.For example, the white wire would connectto the yellowwire and
the white/blackwire would connectto the purple wire.
4. 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.Twistthe like-colored wirestogether.
5. Insert the wiresconnected to the white safety sensor wiresto the white terminal on the garage
door opener. Insert the wires thatare connected to the white/blacksafetysensor wires to the
greyterminal on the garage door opener.
Safety reversing
sensor wires
Pre-installed
wires
White
White/Black
Yellow (for example)
Purple (for example)
Not Provided
Pre-installed wires
Safety reversing
sensor wires
7/16"
(11 mm)
Yellow
Purple
1
3
4
7/16"
(11 mm)
2
Yellow
(for example)
Purple
(for example)
To insert or remove the wires from
the terminal, push in the tab with a
screwdriver tip.
5
RED
WHITE
WHITE
GREY
D
RED
W
RE
WHITE
WHITE
GREY
GREY

20
Power
1 Connect Power
To preventpossible SERIOUS INJURY or DEATH from electrocution or fire:
lBe sure power is NOT connected to the opener,and disconnectpower to circuit BEFORE
removing cover to establish permanentwiring connection.
lGarage door installation and wiring MUST be in compliance with ALL local electrical and
building codes.
lNEVER use an extension cord, 2-wire adapter, or change plug in ANY way to make itfit
outlet. Be sure the opener isgrounded.
To avoid installation difficulties, do not activate
the garage door opener at this time.
To reduce the risk of electric shock, your garage
door opener has a grounding type plug with a third
grounding pin. This plug will only fit into a
grounding type outlet.If the plug doesn’t fitinto your
outlet, contact a qualified electrician to install the
proper outlet.
THERE ARE TWO OPTIONS FOR CONNECTINGPOWER:
OPTION A TYPICAL WIRING
1. Plug in the garage door opener into a
grounded outlet.
2. DO NOT run garage door opener atthis
time.
TYPICAL WIRING
OPTION B PERMANENT WIRING
If permanent wiring is required by your local code, refer to the following procedure.To make a
permanent connection through the 7/8 inch hole in the top of the motor unit (according to local code):
Wiring through a filter board (8550 models manufactured
before April 12, 2013):
1. Be sure power is NOT connected to the opener,
and disconnectpower to circuit.
2. Remove the garage door opener cover and set
aside.
3. Remove the attached green ground terminal.
4. Cutblackand white wires.Strip away1/2 inch (1
cm) of insulation, 3 inches(7.5 cm) before spade
terminals.
5. Remove the power cord from opener.
6. Install a conduit or flexcable adapter to the 7/8 inch
hole.
7. Run wiresthrough conduit,cut to proper length and
strip insulation.
8. Attach with wire nuts provided. Attach the ground
wire to the green ground screw. The opener must
be grounded.
9. Properly secure wire under plastic ties so that wire
doesnotcome in contactwith moving parts.
10. Reinstall the cover. DO NOT run garage door
opener at this time.
Ground Tab
Green Ground
Screw
Ground Wire
Black
Wire
White Wire
PERMANENT WIRING
Wire Nuts
Wiring through a terminalblock (8550 models
manufactured after April 12, 2013 and all 8557 models):
1. Remove the motor unit cover screws and set the
cover aside.
2. Remove the attached 3-prong cord.
3. Connectthe black (line) wire to the screw on the
brass terminal; the white (neutral) wire to the screw
on the silver terminal; and the ground wire to the
green ground screw. The opener must be
grounded.
4. Reinstall the cover.
Ground Tab
Green
Ground
Screw
Ground
Wire
White Wire
PERMANENT WIRING
Black
Wire
Black
Wire