Chamberlain C205C 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
Operation.....................................32-35
Features .......................................33
Using your Garage Door Opener.....34
Push Button Door Control..............34
Remote Control and
Keyless Entry................................35
Homelink® ...................................35
To Erase the Memory .....................35
To Open the Door Manually ...........36
Maintenance .....................................37
Troubleshooting........................... 38-39
Accessories........................................40
Warranty...........................................41
Repair Parts .................................42-43
Owner’s Manual
C205C
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.
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 strict accordance with the instructions and 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 product can expose you to chemicals including lead, which are known to the State of
California to cause cancer or birth defects or 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 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.
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.
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Hz to avoid malfunction and damage.
Before you begin:
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" (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 12.
Torsion
Spring
Extension
Spring
OR
Preparation

3
Additional Items You May Need:
Survey your garage area to see if you will need any of the following items:
n(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.
nSUPPORT BRACKET AND FASTENING HARDWARE
Must be used if you have a finished ceiling in your garage.
nEXTENSION 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.
nFASTENING HARDWARE
Alternate floor mounting of the safety reversing sensor will require hardware not provided.
nDOOR REINFORCEMENT
Required if you have a lightweight steel, aluminum, fiberglass or glass panel door.
nRAIL 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 adjustment is complete. Instructions for 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 product may look different.
Model Power Door Control Remote Control Wireless Keypad
C205C Med Lift Power System™ Push Button 1-button (1)
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/black wire attached: Sending Sensor (1),
Receiving Sensor (1), and Safety Sensor Brackets (2)
NOT SHOWN
White and red/white wire
Owner's manual
Hardware
N
A
B
C
H
K
J
O
I
D
E
F
G
L
M
P
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 (2)
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)
Screw
6ABx1-1/2" (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 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 rest the back end of the rail on top. For
convenience, put a support under the front end of the 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 assembly toward 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 of the
opener.
1. Insert a 1/4"-20 x 1-3/4" bolt into the cover protection bolt hole 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 support the 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” bracket with the previously removed bolts; DO NOT use any power tools. The use of power
tools may permanently damage the garage door opener.
6. Attach chain spreader to the motor unit with two screws.
Bolt
1/4"-20x1-3/4"
Lock Nut
1/4"-20
HARDWARE
“U” Bracket
Hex Screws
8-32x7/16”
Cover
Protection
Bolt Hole
Bolt
1/4"-20 x 1-3/4"
Lock Nut
1/4"-20
Bolts (Mounted in the
garage door opener) Chain
Spreader

8
Assembly
STEP 3 Install the idler pulley
1. Lay the chain beside the rail, as shown. Grasp the end of the chain and pass approximately 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 as shown.
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 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 lift the 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 sprocket while operating opener.
lSecurely attach sprocket cover BEFORE operating.
1. Pull the chain around the idler pulley and toward the trolley.
2. Connect the chain to the retaining slot on the trolley, as shown. (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 of the clip-on spring over one of the pins. Push the open end of the clip-on
spring onto the other pin.
3. With the trolley against the screwdriver, dispense the remainder of the chain along the rail toward the motor
unit around the sprocket and 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 connect it to the threaded shaft with the remaining master
link.
5. Thread the inner nut and lock washer 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 lock washer down the trolley threaded shaft, away from 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 of the rail at the 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. This is normal. If the chain returns to the position shown when the door is open, do not re-adjust
the 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)