Chamberlain C455 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
Power......................................27-28
Adjustments.................................29-31
MyQ® Smartphone Control.................32
Operation.....................................33-37
Using your Garage Door Opener.....34
To Open the Door Manually ...........34
Multi-Function
Control Panel...........................35-36
Remote Control and
Keyless Entry................................36
Homelink® ...................................36
To Erase the Memory .....................37
Maintenance .....................................38
Troubleshooting...........................39-40
Accessories........................................41
Warranty...........................................42
Repair Parts .................................43-44
Owner’s Manual
C455
Chain Drive
Garage Door Opener
FOR RESIDENTIAL USE ONLY
PRE-PROGRAMMED REMOTE CONTROL
INCLUDED
www.chamberlain.com
www.mychamberlain.com
• 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 front 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.
Smart Garage Opener

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 strictaccordance 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 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.
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.
WARNING: This productcan expose you to chemicals including 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 ofunattended close and are to be used ONLY with sectional doors. Any
device or feature thatallows the door to close withoutbeing in the line of sight ofthe door is considered
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 ofbalance.
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locksand 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 ifusing devicesor 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 at120V, 60Hzto avoid malfunction and damage.
Before you begin:
1. Disable locksand 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 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 left or right of the
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 (CIGBU) see page 41
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 connect your garage door opener to your Wi-Fi network.
Additional Items You May Need:
Survey your garage area to see if you will need anyof the following items:
l(2) 2X4 Pieces of wood : May be used to fasten the header bracketto 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: Mustbe 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 safety reversing sensor will require
hardware notprovided.
lDoor reinforcement: Required if you have a lightweight steel, aluminum, fiberglass or glass
panel door.
lRail extension kit: Required if your garage door is more 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.Instructionsfor
the accessories will be attached to the accessory and are not included in this manual. The images
throughout this manual are for reference only and your productmay look different.
Model Power Door Control Remote Control Wireless Keypad
C455 Med Lift Power System™ Multi-Function 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 front and 4 center sections)
I. Hanging brackets (2) (Packaged inside the front rail section)
J. Garage door opener (motor unit)
K. Chain spreader with screws
L. “U” bracket
M. Chain
N. Door control
O. Remote control
P. The Protector System®
Safety reversing sensors with 2 conductor white and white/blackwire attached: Sending
Sensor (1), Receiving Sensor (1),and Safety Sensor Brackets(2)
NOT SHOWN
Wireless Keypad
White and red/white wire
Owner's manual
Hardware
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A
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C
H
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Preparation

5
Hardware
ASSEMBLY INSTALLATION DOOR CONTROL
Insulated Staples
(Not Shown)
Bolt
1/4"-20x1-3/4"
Lock Nut
1/4"-20
Bolt
Nut 3/8" Lock Washer 3/8"
Master Link
Threaded
Shaft Clevis Pin 5/16"x1-1/2"
Ring
Fastener (3)
Hex Bolt 5/16"-18x7/8" (4)
Lock Washer
5/16"-18 (5)
Nut
5/16"-18 (6)
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)
Preparation

6
Assembly
STEP 1 Assemble the rail and install the trolley
To prevent INJURY from pinching, keep hands and fingers away from the joints while assembling the
rail.
To avoid installation difficulties, do not run the garage door opener 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 sectionson a flatsurface as shown and slide the tapered endsinto the larger
ones. Tabs along the side will lock into place.
3. Place the motor uniton packing material to protectthe cover,and rest the backend ofthe 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 pads inside 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 as shown.
7. Slide the rail onto the “U” bracket,until it reaches all the stops on the top and sides of the “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 x 1-3/4" bolt into the cover protection bolthole on the back end of the rail as
shown. Tighten securely with a 1/4"-20 lock nut. DO NOT overtighten.
2. Remove the bolts from 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 bracketholeswith the
bolt holes.
5. Fasten the “U” bracket with the previously removed bolts; DO NOT use any power tools. The
use of power tools maypermanently damage the garage door opener.
6. Attach chain spreader to the motor unit with two screws.
“U” Bracket
Hex Screws
8-32x7/16
Cover
Protection
Bolt Hole
Bolt
Lock Nut
Bolts (Mounted in the
garage door opener)
Chain
Spreader
Bolt
1/4"-20x1-3/4"
Lock Nut
1/4"-20
HARDWARE

8
Assembly
STEP 3 Install the idler pulley
1. Lay the chain beside the rail, asshown.Grasp the end of the chain and passapproximately
12" (30 cm) of chain through the window. Allow it to hang until Assembly Step4.
2. Remove the tape from the idler pulley.The inside center should be pre-greased.If dry,
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" lockwasher
and nut underneath the rail until the lock washer is compressed.
5. Rotate the pulley to be sure it spins freely.
6. Locate the rail tab. The rail tab is near the idler pulley on the front rail section.Use a flat head
screwdriver and liftthe rail tab until the tab is vertical (90º).
Rail
Idler Pulley
Grease Inside
Pulley
Bolt
Chain
Lock Washer
Nut
Bolt Nut 3/8" Lock Washer 3/8"
HARDWARE
Rail Tab

9
Assembly
STEP 4 Install the chain
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.
1. Pull the chain around the idler pulley and toward the trolley.
2. Connectthe chain to the retaining sloton the trolley, asshown.(Figure 1)
a. Push pins of master link bar through chain link and trolley slot.
b. Push master link cap over pins and past pin notches.
c. Slide the closed end ofthe clip-on spring over one of the pins. Push the open end of
the clip-on spring onto the other pin.
3. With the trolleyagainstthe screwdriver,dispense the remainder ofthe chain along the rail
toward the motor unit around the sprocketand continuing to the trolley assembly. The sprocket
teeth must engage the chain. (Figure 2)
4. Check to make sure the chain is not twisted, then connectit to the threaded shaft with the
remaining master link.
5. Thread the inner nut and lockwasher onto the trolley threaded shaft.
6. Insert the trolley threaded shaft through the hole in the trolley. Be sure the chain is not twisted.
(Figure 3)
7. Loosely thread the outer nut onto the trolley threaded shaft.
8. Remove the screwdriver.
Sprocket
Figure 1
Figure 2
HARDWARE
Master
Link
Threaded Shaft
Threaded
Shaft
Outer Nut
Inner Nut
Lock Washer
Master Link
Master
Link
Figure 3
a.
b.
c.

10
Assembly
STEP 5 Tighten the chain
1. Spin the inner nut and lockwasher down the trolley threaded shaft,awayfrom the trolley.
2. To tighten the chain, turn the outer nut in the direction shown.
3. When the chain is approximately 1/4" (6 mm) above the base ofthe rail at it's midpoint,
retighten the inner nut to secure the adjustment.
Sprocket noise can result if the chain is too loose. When installation is complete, you may notice some
chain droop with the door closed.Thisis normal.If the chain returns to the position shown when the
door isopen,do notre-adjustthe chain.
NOTE: During future maintenance, ALWAYS pull the emergency release handle to disconnect the
trolley before adjusting the chain.
You have now finished assembling your garage door opener. Please read the following warnings
before proceeding to the installation section.
Outer
Nut
Lock
Washer
Trolley
Threaded
Shaft
Inner Nut
To Tighten
Inner Nut
To Tighten
Outer Nut
Mid length of RailBase of Rail
Chain
1/4" (6 mm)