Chamberlain B970C User manual

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Contents
Preparation......................................2-5
Assembly .........................................6-9
Installation ..................................10-27
Install the Door Control ............20-21
Install the Protector System® ....22-25
Connect power.........................26-27
Adjustments.................................28-30
Battery Backup ..................................31
MyQ® Smartphone Control.................32
Operation.....................................33-37
Using your Garage Door Opener.....34
To Open the Door Manually ...........34
Smart Control Panel® ...............35-36
Remote Control.............................36
Homelink® ...................................36
To Erase the Memory .....................37
Maintenance .....................................38
Troubleshooting...........................39-40
Accessories........................................41
Warranty...........................................42
Repair Parts .................................43-44
Owner’s Manual
B970C
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 has been designed and tested to offer safe service provided it is installed,
operated, maintained and tested in strictaccordance 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 ofunattended close and are to be used ONLY with sectional doors.Any
device or feature that allowsthe door to close without being in the line of sight ofthe 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 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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 locksand 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 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 of the 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 11.
Torsion
Spring
Extension
Spring
OR
Preparation

3
Before You Connect with Your Smartphone
Monitor and control your garage door from anywhere using the MyQ app. 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 MyQ Internet Gateway (828LG) 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 support.chamberlaingroup.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 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 if you 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 not
provided.
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 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
B970C Max Lift Power System™ Smart Control Panel®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. Sprocket cover and screws
L. “U” bracket
M. Belt
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
Wireless keypad
White and red/white wire
Owner's manual
Hardware
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 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 ends into the larger
ones. Tabs along the side will lock into place.
3. Place the motor unit on packing material to protectthe cover,and rest the backend 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, checkall packing material. Snap them backinto position as shown.
6. Slide the trolley assembly toward the screwdriver as shown.
7. Slide the rail onto the “U” bracket, until itreachesall 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 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 ofthe motor unit.
3. Use the carton to support the frontend of the rail.
4. Place the “U” bracket,flat side down onto the motor unitand 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.
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)
STEP 3 Install the idler pulley
1. Lay the beltbeside the rail, as shown.Grasp the end with the hooked trolley connector and
pass approximately 12" (30 cm) of belt through the window. Keep the ribbed side toward the
rail, and 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" 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 between the idler bolt and the trolley in the front rail section.
Use a flathead screwdriver and liftthe rail tab until the tab is vertical (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

8
Assembly
STEP 4 Install the belt
1. Pull the beltaround the idler pulleyand toward the trolley.The ribbed side mustcontact the
pulley.
2. Hook the trolley connector into the retaining slot on the trolley as shown (Figure 1).
3. With the trolley againstthe screwdriver, dispense the remainder of the belt along the rail
lengthtoward the motor unit and around the sprocket (Figure 2). The sprocket teeth must
engage the belt.
4. Check to make sure the belt is not twisted. Connect the 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 past pin notches.
lSlide 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.
5. Remove the spring trolley nut from 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

9
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 not use any tools. Remove the screwdriver.
2. Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmlyagainstthe
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 againstthe trolley.Thissetsthe
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 of sprocket 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

10
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 atleast6 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 small children at a minimum height of 5feet (1.5m) above floors, landings,
steps or any other adjacent walking surface.
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 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.