Chamberlain 8550W User manual

Wi-Fi®Garage Door Opener
Belt Drive Models 8550W and 8550W-267
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www.prodregister.com/LiftMaster

2
Contents
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Install the Door Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Install the Protector System®. . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Battery Backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3
Preparation
MyQ®Serial Number
Write down the following information for future reference:
MyQ®Serial Number:
MyQ®Serial Number
Accessory Setup Code Product S/N
Accessory Setup Code:
Product S/N:
Date of Purchase:
/ /
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.
Unattended Operation
The Timer-to-Close (TTC) feature, the MyQ®Smartphone Control app, and MyQ®Garage
Door and Gate Monitor are examples of unattended close and are to be used ONLY with
sectional doors. Any device or feature that allows the door to close without being in the
line of sight of the door is considered unattended close. The Timer-to-Close (TTC)
feature, the MyQ®Smartphone Control, and any other MyQ®devices are to be used
ONLY with sectional doors.

4
Preparation
Test the Wi-Fi®Signal Strength
Before You Begin
You will need:
lWi-Fi enabled smartphone, tablet or laptop
lBroadband Internet Connection
lWi-Fi®signal in the garage
lPassword for your home network
lMyQ Serial number (located on the garage door opener.)
Test the Wi-Fi®Signal Strength
Make sure your mobile device is connected to your Wi-Fi network. Hold your mobile
device in the place where your garage door opener will be installed and check the Wi-Fi
signal strength.
Check Signal Strength. If you see:
Wi-Fi signal is strong.
The garage door opener will
connect to your Wi-Fi
network.
Wi-Fi signal is weak.
The garage door opener may connect
to your Wi-Fi network. If not, try one
of the options below to improve the
Wi-Fi signal:
No Wi-Fi signal.
The garage door opener will not be
able to connect to your Wi-Fi
network. Try one of the options
below to improve the Wi-Fi signal:
• Move your router closer to the garage
door opener to minimize interference from
walls and other objects
• Buy a Wi-Fi range extender
See page 32 to connect the garage door opener mobile device or visit
WiFiHelp.LiftMaster.com for more details
Check the Door
To prevent possible SERIOUSINJURYor DEATH:
lALWAYS 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.
lNEVER try to 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ropes connected to garage door BEFORE
installation and operating garage door opener to avoid entanglement.
To prevent damage to garage door and opener:
lALWAYS disable locks BEFORE installing and operating the opener.
lONLY operate garage door opener at 120V, 60Hz to 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. 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 page 10.
Torsion
Spring
Extension
Spring
OR

5
Preparation
Tools Needed
3/16
5/32
5/16
7/16
1/2
5/8
9/16
1/4
7/16

6
Preparation
Carton Inventory
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 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 (Smart Control Panel® 880LM)
M. White and red/white wire
N. The Protector System®
Safety reversing sensors with white and white/black wire attached:
Sending senor (1), receiving sensor (1), and safety sensor brackets (2)
O. Safety labels and literature
P. Rail grease
Q. 3-Button Remote Control
893MAX
Model 8550W (1)
Model 8550W-267 (2)
R. Keyless Entry
877MAX
Model 8550W-267 ONLY
Installation
Hex Bolt 5/16"-18 x 7/8" (4) Lock Washer 5/16"-16 (4)
Lag Screw 5/16"-9 x 1-5/8" (2) Self-Threading Screw 1/4"-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" x 1" (1) Wing Nut 1/4"-20 (2)
Nut 5/16"-18 (4)
Door Control Hardware
Screw 6AB x 1-1/4" (2) Drywall Anchors (2)
Screw 6-32 x 1" (2) Insulated Staples
AB
C
J
N
I
OP
DE
F
H
GK
L
M
Not Provided
Not
Provided
Q
R

7
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 sprocket while 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 bolts removed from the garage door opener. Place the garage door
opener on the packing material to prevent scratching.
1. Remove the two bolts from the top of the garage door opener.
2. Align the rail and the styrofoam over the sprocket. Cut the tape from the rail, belt,
and styrofoam.
3. Fasten the rail with the previously removed bolts.
4. Position the belt around the garage door opener sprocket.
5. Attach the sprocket cover over the garage door opener sprocket and attach with
hex screws.
Model 8550W
Model 8557W
Washered Bolt
5/16"-18x1/2"
Hex Screw
#8x3/8"
Lock Nut
Washered Bolt 5/16"-18x1/2"
(Mounted in the garage
door opener)
Hex Screw
#8x3/8"
(Packed with the
sprocket cover)
Washered Bolt
5/16"-18x1/2"
Hex Screw
#8x3/8"
HARDWARE

8
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 of the nut ring slots and brace it firmly
against the trolley.
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.
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

9
Installation
IMPORTANT INSTALLATION INSTRUCTIONS
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 least 6 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:
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/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 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 functionality if operating either one-piece
or swinging garage doors. To be enabled ONLY when operating a sectional
door.

10
Installation
1 Determine the Header Bracket Location
To prevent possible SERIOUS INJURY or DEATH:
lHeader 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.
lConcrete anchors MUST be used if mounting 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 systems technician if garage door binds, sticks, or is
out 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.
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 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.
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: If the total number of inches exceeds the height available in your garage, use the
maximum height possible, or refer to page 11 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