Chamberlain BC550C User manual

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Contents
Preparation......................................2-5
Assembly .......................................6-10
Installation ..................................11-28
Install the Door Control ............21-22
Install the Protector System® ....23-26
Connect power.........................27-28
Adjustments.................................29-31
MyQ® Smartphone Control.................32
Operation.....................................33-39
Using your Garage Door Opener.....34
To Open the Door Manually ...........34
Motion Detecting
Control Panel........................... 35-36
Multi-Function Control Panel.... 37-38
Remote Control.............................38
Homelink® ...................................38
To Erase the Memory .....................39
Maintenance .....................................40
Troubleshooting...........................41-42
Accessories........................................43
Warranty...........................................44
Repair Parts .................................45-47
Owner’s Manual
B550C • B750C • B751C
Belt Drive
Garage Door Opener
FOR RESIDENTIAL USE ONLY
PRE-PROGRAMMED REMOTE CONTROL
INCLUDED
www.chamberlain.com
www.mychamberlain.com
Smart Garage Opener
• 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 compatible with MyQ® and
Security+b2.0® accessories.
• DO NOT install on a one-piece door if using devices or features
providing unattended close. Unattended devices and features are
to be used ONLY with sectional doors.

2
Safety Symbol and Signal Word Review
This garage door opener hasbeen designed and tested to offer safe service provided it isinstalled,
operated,maintained and tested in strict accordance with the instructionsand warnings contained in
this manual.
Mechanical
Electrical
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.
When you see this Signal Word on the following
pages, itwill alert you to the possibility ofdamage
to your garage door and/or the garage door
opener if you do notcomplywith the cautionary
statements that accompany it. Read them carefully.
WARNING: This productcan expose you to chemicalsincluding lead,which are known to the
State of California to cause cancer or birth defectsor other reproductive harm.For more
information go to www.P65Warnings.ca.gov
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 ofsight of the door isconsidered
unattended close.The Timer-to-Close (TTC) feature,the MyQ®Smartphone Control, and anyother
MyQ®devices are to be used ONLY with sectional doors.
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 mayNOT 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.
lDO NOT install on a one-piece door if using devices or features providing unattended close.
Unattended devices and features are to be used ONLY with sectional doors.
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Hzto avoid malfunction and damage.
Before you begin:
1. Disable locks and remove anyropes 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 ofthe door. Any gap between the floor
and the bottom ofthe door mustnot 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.If there is
a torsion spring or center bearing plate in the way ofthe header
bracket, it may be installed within 4feet (1.2 m) to the leftor right ofthe
door center.See page 12.
Torsion
Spring
Extension
Spring
OR
Preparation

3
Test the Wi-Fi®Signal Strength in your garage
You will need a router with Wi-Fi and a smartphone or other mobile device.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.
Wi-Fi signal is weak.
The garage door opener will likely connect to your Wi-Fi
network. If not, try one of the options below.
No Wi-Fi signal. Try one of the following:
• Move your router closer to the garage door opener to
minimize interference from walls and other objects
• Buy a Wi-Fi range extender
• Buy a Chamberlain MyQ®Internet Gateway (CIGBUC) see page 40
Check Signal Strength. If you see:
Wi-Fi signal is strong. You’re all set!
Install your new garage door opener.
Visit wifihelp.chamberlain.com for more details
See MyQ®Smartphone Control page 32 to connectyour garage door opener to your Wi-Fi network.
Additional Items You May Need:
Survey your garage area to see if you will need any of the following items:
l(2) 2X4 Pieces of wood : May be used to fasten the header bracket to the structural supports.
Also used to position the garage door opener during installation and for testing the safety
reversing sensors.
lSupport bracket and fastening hardware: Must be used ifyou have a finished ceiling in your
garage.
lExtension brackets (MODEL 041A5281-1) or wood blocks: Depending upon garage
construction, extension brackets or wood blocks may be needed to install the safety reversing
sensor.
lFastening hardware: Alternate floor mounting of the safetyreversing sensor will require
hardware notprovided.
lDoor reinforcement: Required if you have a lightweight steel, aluminum, fiberglass or glass
panel door.
lRail extension kit: Required ifyour garage door ismore than 7 feet(2.13 m) high.
Tools Needed
3/16
7/16
1/2
5/32
5/16
5/8
9/16
1/4
7/16
Preparation

4
Carton Inventory
Save the carton and packing material until the installation and adjustmentis complete.Instructions for
the accessories will be attached to the accessory and are notincluded in this manual. The images
throughout this manual are for reference only and your product may look different.
Model Power Door Control Remote Control Wireless Keypad
B550C Med Lift Power System™ Multi-Function 3-button (2) ü
B750C PlusLiftPower System™ Motion Detecting 3-button (2) ü
B751C PlusLiftPower System™ Motion Detecting 3-button (2) ü
A. Header bracket
B. Pulley
C. Door bracket
D. Curved door arm
E. Straight door arm
(Packaged inside front rail section)
F. Trolley
NOTE: Be sure to assemble the trolley before sliding onto rail.
G. Emergency release rope and handle
H. Rail (1 frontand 4 center sections)
I. Hanging brackets (2)
(Packaged inside the front rail section)
J. Garage door opener (motor unit)
K. Sprocket cover and screws
L. “U” bracket
M. Belt
N. Door control
O. Remote control
P. The Protector System®
Safety reversing sensorswith 2 conductor white and white/blackwire attached: Sending
Sensor (1), Receiving Sensor (1), and Safety Sensor Brackets(2)
NOT SHOWN
Wireless Keypad Owner's manual
White and red/white wire Hardware
N
A
B
C
H
K
J
OP
I
D
E
F
G
L
M
OR
Preparation

5
Hardware
ASSEMBLY INSTALLATION DOOR CONTROL
Insulated Staples
(Not Shown)
Clevis Pin 5/16"x1-1/2"
Ring
Fastener (3)
Hex Bolt 5/16"-18x7/8" (4)
Self-Threading Screw
1/4"-14x5/8" (2)
Clevis Pin 5/16"x1" Clevis Pin 5/16"x1-1/4"
Carriage Bolt
1/4"-20x1/2" (2)
Wing Nut
1/4"-20 (2)
Lag Screw 5/16"-9x1-5/8" (4)
Screw 6ABx1" (2)
Drywall Anchors (2)
Screw 6-32x1" (2)
Hex Screw #8x3/8" (3)
(packed with the
sprocket cover)
Bolt
1/4"-20x1-3/4"
Lock Nut
1/4"-20
Bolt
Nut 3/8"
Lock Washer 3/8"
Master Link
Threaded
Shaft with
Spring
Trolley Nut
Lock Washer
5/16"-18 (4)
Nut
5/16"-18 (4)
Preparation

6
Assembly
STEP 1 Assemble the rail and install the trolley
To prevent INJURY from pinching, keep hands and fingers awayfrom the jointswhile assembling the
rail.
To avoid installation difficulties, do not run the garage dooropener until instructed to do so.
The front rail has a cut out “window” at the door end. The rail tab MUST be on top of the rail when
assembled.
1. Remove the straight door arm and hanging bracket packaged inside the front rail and set
aside for Installation Step 5 and 9. NOTE: To prevent INJURY while unpacking the rail
carefully remove the straight door arm stored within the rail section.
2. Align the rail sections on a flat surface as shown and slide the tapered ends into the larger
ones. Tabs along the side will lock into place.
3. Place the motor unit on packing material to protect the cover, and restthe backend of the rail
on top. For convenience,put a support under the frontend ofthe rail.
4. As a temporary stop, insert a screwdriver into the hole in the second rail section from the motor
unit, as shown.
5. Check to be sure there are 4 plastic wear padsinside the inner trolley.If they became loose
during shipping, check all packing material. Snap them back into position as shown.
6. Slide the trolley assemblytoward the screwdriver asshown.
7. Slide the rail onto the “U” bracket,until itreaches all the stops on the top and sides ofthe “U”
bracket.
Wear Pads
Front Rail Section
(TO DOOR)
“U” Bracket
(TO MOTOR UNIT)
Trolley
Rail Tab
On Top
Slide to stops
on top and sides
of “U” bracket
Screwdriver

7
Assembly
STEP 2 Fasten the rail to the motor unit
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the
top ofthe opener.
1. Insert a 1/4"-20 x1-3/4" bolt into the cover protection bolthole on the back end of the rail as
shown.Tighten securely with a 1/4"-20 locknut. DO NOT overtighten.
2. Remove the boltsfrom the top of the motor unit.
3. Use the carton to supportthe front end of the rail.
4. Place the “U” bracket, flat side down onto the motor unit and align the bracket holes with the
bolt holes.
5. Fasten the “U” bracketwith the previouslyremoved bolts; DO NOTuse any power tools. The
use of power toolsmay permanently damage the garage door opener.
Bolt
1/4"-20x1-3/4"
Lock Nut
1/4"-20
HARDWARE
“U” Bracket
Cover Protection
Bolt Hole
Bolt
Lock Nut
Bolts (Mounted in the
garage door opener)

8
Assembly
STEP 3 Install the idler pulley
1. Lay the beltbeside the rail, asshown.Grasp the end with the hooked trolley connector and
passapproximately 12" (30 cm) of beltthrough the window. Keep the ribbed side toward the
rail,and allow it to hang until AssemblyStep 4.
2. Remove the tape from the idler pulley.The inside center should be pre-greased. Ifdry,
regrease to ensure proper operation.
3. Place the idler pulley into the window asshown.
4. Insert the idler bolt from the top through the rail and pulley. Tighten with a 3/8" lock washer
and nut underneath the rail until the lockwasher is compressed.
5. Rotate the pulley to be sure it spins freely.
6. Locate the rail tab. The rail tab isbetween the idler boltand the trolley in the front rail section.
Use a flathead screwdriver and liftthe rail tab until the tab isvertical (90º).
Rail
Idler Pulley
Grease Inside
Pulley
Bolt
Belt
Lock Washer
Nut
Bolt Nut 3/8" Lock Washer 3/8"
HARDWARE
Trolley Connector
Rail Tab

9
Assembly
STEP 4 Install the belt
1. Pull the beltaround the idler pulley and toward the trolley.The ribbed side must contact the
pulley.
2. Hook the trolley connector into the retaining slot on the trolley asshown (Figure 1).
3. With the trolley againstthe screwdriver,dispense the remainder ofthe belt along the rail
lengthtoward the motor unitand around the sprocket (Figure 2). The sprocket teeth must
engage the belt.
4. Check to make sure the belt isnot twisted.Connectthe trolley threaded shaft with the master
link(Figure 3).
lPush pins of master link bar through holes in end of belt and trolley threaded shaft.
lPush master link cap over pins and pastpin notches.
lSlide the closed end of the clip-on spring over one of the pins.Push the open end ofthe
clip-on spring onto the other pin.
5. Remove the spring trolley nutfrom the threaded shaft.
6. Insert the trolley threaded shaft through the hole in the trolley.
HARDWARE
Master Link
Figure 3
Threaded Shaft with Spring Trolley Nut
Threaded Shaft
Master Link
Sprocket
Figure 2
Figure 1 Trolley
Connector
Retaining
Slot

10
Assembly
STEP 5 Tighten the belt
1. By hand, thread the spring trolley nut on the threaded shaft until it is finger tight against the
trolley.Do notuse any tools.Remove the screwdriver.
2. Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmlyagainst 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 releasesand snapsthe nut ring against the trolley.Thissets the
spring to optimum belt tension.
Spring
Trolley Nut
Nut Ring Slot
Nut RingNut Ring
AFTER
1-1/4" (3.18 cm)
BEFORE
1" (2.5 cm)
STEP 6 Install the sprocket cover
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
lALWAYS keep hand clear ofsprocket while operating opener.
lSecurely attach sprocket cover BEFORE operating.
1. Position the sprocket cover over the sprocket asshown and fasten to the mounting plate with
8x3/8" hex screws provided.
You have now finished assembling your garage door opener. Please read the following warnings
before proceeding to the installation section.
Hex Screw #8x3/8"
(Packed with the sprocket cover)
HARDWARE
Hex Screw
Sprocket Cover