Chamberlain B353 User manual

Owner’s Manual
B353
Belt Drive Garage Door
Opener
FOR RESIDENTIAL USE ONLY
PRE-PROGRAMMED REMOTE
CONTROL INCLUDED
Smart Garage Opener
lPlease read this manual and the enclosed safety materials
carefully!
lFasten the manual near the garage door after installation.
lThe door WILL NOT CLOSE unless the Protector System® is
connected and properly aligned.
lPeriodic checks of the garage door opener are required to
ensure safe operation.
lThe model number label is located on the front panel of your
garage door opener.
lThis garage door opener is compatible with myQ®and
Security+2.0® accessories.
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.
Contents
Preparation 2
Assembly 6
Installation 11
Install the Door Control 21
Install the Protector System® 23
Connect Power 27
Adjustments 29
myQ® App Control 32
Operation 33
Using your Garage Door Opener 35
Push Button Door Control 35
Remote Control and Keyless Entry 35
HomeLink® 35
To Erase the Memory 36
To Open the Door Manually 36
Maintenance 37
Troubleshooting 38
Warranty 41
Repair Parts 42
www.chamberlain.com

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®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®App, 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
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
Check Signal Strength. If you see:
Wi-Fi signal is strong. You’re all set!
Install your new garage door opener.
See myQ®App 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
B353 Med Lift Power System™ Push Button 3-button
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 - Model 953ESTD
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
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" (2)
(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 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.
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 belt beside 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 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 between the idler bolt and the trolley in the front rail section. Use a
flathead screwdriver and lift the 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

9
Assembly
STEP 4 Install the belt
1. Pull the belt around 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 as shown (Figure1).
3. With the trolley against the 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

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 not
use any tools. Remove the screwdriver.
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
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 as shown 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 #8x3/8"
Sprocket Cover