Chamberlain 8355 - 1/2 hp User manual

CONTENTS
Preparation. . . . . . . . . . . . . . . .2-3
Assembly . . . . . . . . . . . . . . . . .4-5
Installation . . . . . . . . . . . . . . .6-13
Install the Door Control. . . . . . 14-16
Install the Protector System®. . 17-20
Power. . . . . . . . . . . . . . . . . . 21-22
Adjustments . . . . . . . . . . . . . 23-25
Operation . . . . . . . . . . . . . . . . . 26
Features . . . . . . . . . . . . . . . . . . 27
Door Control . . . . . . . . . . . . . 28-29
Remote Control . . . . . . . . . . . 30-31
To Erase the Memory . . . . . . . . . 31
To Open the Door Manually . . . . . 32
Maintenance . . . . . . . . . . . . . . . 32
Troubleshooting. . . . . . . . . . . 33-34
Accessories. . . . . . . . . . . . . . . . 35
Warranty. . . . . . . . . . . . . . . . . . 36
Repair Parts . . . . . . . . . . . . . 37-38
PREMIUM Series
Belt Drive Garage Door
Opener
The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
■ 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 ONLY compatible with MyQ®and Security✚2.0™
accessories.
■ONLY enable the Timer-to-Close* or MyQ®remote operation feature* when
the garage door opener is installed on a sectional door. (*Not available on all
models)
NOTE: If you are installing the garage door opener on a one-piece door, visit
www.liftmaster.com for installation instructions.
www.liftmaster.com
Serial Number:
Date of Purchase:
Model 8355 - 1/2 hp
FOR RESIDENTIAL USE ONLY
Write down the following information for
future reference:
.
Compliments of Garage Door Corp, Skokie, IL
www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

2
Safety Symbol and Signal
Word Review
Thisgarage door opener has been designed and
tested to offer safe service provided it isinstalled,
operated,maintained and tested in strict
accordance with the instructions and warnings
contained in this manual.
When you see these Safety Symbolsand Signal
Words on the following pages, they will alert you
to the possibilityof serious injury or death if you
do notcomply with the warnings that accompany
them. The hazard may come from something
mechanical or from electric shock. Read the
warnings carefully.
Mechanical
Electrical
When you see this Signal Word on the following
pages,itwill alert you to the possibilityof damage
to your garage door and/or the garage door
opener if you do notcomply with the cautionary
statements that accompany it. Read them
carefully.
Check the Door
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 checkfor
binding or sticking. Ifyour door binds,
sticks, or is out of balance, call a trained
door systems technician.
4. Check the seal on the bottom ofthe
door.Anygap between the floor and
the bottom of the 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 of the door.Ifthere 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
left or right of the door center. See
page 7.
Torsion Spring Extension Spring
OR
To prevent possible SERIOUSINJURYor
DEATH:
• ALWAYS 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.
• NEVER try to loosen, move or adjust
garage door, door springs, cables, pulleys,
brackets or their hardware, ALLof which
are under EXTREMEtension.
• Disable ALLlocks and remove ALLropes
connected to garage door BEFORE
installation and operating garage door
opener to avoid entanglement.
To preventdamage to garage door and
opener:
• ALWAYS disable locks BEFORE installing
and operating the opener.
• ONLY operate garage door opener at
120 V,60 Hzto avoid malfunction and
damage.
Tools Needed
2
1
3/16
7/16
1/2
5/32
5/16
5/8
9/16
1/4
7/16
Preparation
Compliments of Garage Door Corp, Skokie, IL
www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

3
AB
C
J
N
I
OP
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F
H
GK
L
M
Carton Inventory
A.tekcarbredaeH
B.Pulley and bracket
C.tekcarbrooD
D.mrarooddevruC
E.mraroodthgiartS
F.yellorT
G. Emergency release rope and handle
H.Rail
I.reneporoodegaraG
NOTE: Accessories will vary depending on the garage door opener model purchased. Depending on your specific model, other accessories
may be included with your garage door opener. The instructions for these accessories will be attached to the accessory and are not included
in this manual. The images throughout this manual are for reference and your product may look different.
J.
K.tleB
L.lortnocrooD
M. eriwetihw/derdnaetihW
N.
srosnesgnisreverytefaS
with white and white/black wire attached:
Sending Sensor (1) Receiving Sensor (1)
and Safety Sensor Brackets (2)
O.erutaretildnaslebalytefaS
P.Rail grease
Not Provided
Not Provided
Hardware
Installation
Hex Bolt 5/16"-18 x 7/8" (4)
Lag Screw 5/16"-9 x 1-5/8" (2)
Clevis Pin 5/16" x 2-3/4" (1)
Clevis Pin 5/16" x 1-1/4" (1)
Clevis Pin 5/16" x 1" (1)
Nut 5/16"-18 (4)
Lock Washer 5/16" (4)
Self-Threading Screw 1/4"-14 x 5/8" (2)
Ring Fastener (3)
Carriage Bolt 1/4"-20 x 1/2" (2)
Wing Nut 1/4"-20 (2)
Door Control Hardware
Screw 6AB x 1" (2)
Screw 6-32 x 1" (2)
Drywall Anchors (2)
Insulated Staples
The Protector System®
Sprocket cover with hex screws
SECURITY✚ 2.0TM ACCESSORIES
893LM
Remote Control
882LM
Multi-Function
Door Control
Preparation
Compliments of Garage Door Corp, Skokie, IL
www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

4
To avoid possible SERIOUS INJURY to finger from
moving garage door opener:
• ALWAYS keep hand clear of sprocket while
operating opener.
• Securely attach sprocket cover BEFORE
operating.
To avoid SERIOUS damage to garage door
opener, use ONLY those bolts/fasteners
mounted in the top of the opener.
Washered Bolt
5/16"-18x1/2"
(Mounted in the
garage door opener)
HARDWARE
Hex Screw
#8x3/8"
(Packed with the
sprocket cover)
Lock Nut
(Mounted in the
garage door opener)
NOTE: ONLY use the bolts removed from the
garage door opener. Place the garage door
opener on the packing material to prevent
scratching.
1.1 Remove boltand lock nutfrom the top
of the garage door opener.
1.2 Align the rail and the styrofoam over the
sprocket.Cut the tape from the rail, belt,
and styrofoam.
1.3 Fasten the rail with the previously
removed bolts.
Fasten the rail with the previously
removed washer bolt and lock nut.
1.4 Position the belt around the garage
door opener sprocket.
1.5 Attach the sprocketcover over the
garage door opener sprocket and
attach with hex screws.
Hex Screw
#8x3/8"
Washered Bolt
5/16"-18x1/2" Lock
Nut
Assembly
1Attach the rail to the garage door opener
Compliments of Garage Door Corp, Skokie, IL
www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

5
2Tighten the Belt
2.1 By hand, thread the spring trolley nut on the threaded shaftuntil itis finger tight against
the trolley.Do not use any tools.
Spring Trolley Nut
(To motor unit)
2.2 Inserta flathead screwdriver tip into one ofthe nutring slotsand brace it firmly againstthe trolley.
Nut ring
slot
2.3 Tighten the spring trolley nut with an adjustable wrench or a 7/16" open end wrench abouta quarter turn until the spring releases and snapsthe nut ring againstthe trolley.This setsthe spring to
optimum belt tension.
Nut Ring Nut Ring
AFTER RELEASE
1-1/4"
(3.18 cm)
BEFORE
1"
(2.5 cm)
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www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

6
IMPORTANT INSTALLATION INSTRUCTIONS
WARNING
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 properlybalanced and lubricated garage door. An
improperly balanced door may NOT reverse when required and could result in SEVERE
INJURY or DEATH.
3. ALL repairsto cables,spring assembliesand other hardware MUST be made bya trained
door systemstechnician BEFORE installing opener.
4. Disable ALL locksand 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 at least6 feet (1.83 m) above the floor and
avoiding contactwith vehicles to avoid accidental release.
7. NEVER connectgarage 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 caughtin garage door or opener mechanisms.
9. Install wall-mounted garage door control:
• within sight of the garage door.
• out of reach of children at minimum height of 5 feet (1.5 m).
• away from ALL moving parts of the door.
10. Place entrapment warning label on wall nextto garage door control.
11. Place manual release/safetyreverse test label in plain view on inside of garage door.
12. Upon completion of installation, testsafety reversal system.Door MUSTreverse on contactwith
a 1-1/2" (3.8 cm) high object(or a 2x4 laid flat) on the floor.
13. To avoid SERIOUS PERSONAL INJURY or DEATHfrom electrocution,disconnectALL
electric and batterypower BEFORE performing ANY service or maintenance.
14. DO NOT enable the Timer-to-Close functionalityif operating either one-piece or swinging
garage doors.To be enabled ONLY when operating a sectional door.
NOTE:If you are installing the garage door opener on a one-piece door, visit www.liftmaster.com for installation instructions.
Installation
Compliments of Garage Door Corp, Skokie, IL
www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

7
To prevent possible SERIOUS INJURY or
DEATH:
• Header bracket MUST be RIGIDLY
fastened to structural supporton header
wall or ceiling, otherwise garage door might
NOT reverse when required. DO NOT
install header bracket over drywall.
• Concrete anchors MUST be used if
mounting header bracket or 2x4 into
masonry.
• NEVER try to loosen, move or adjust
garage door, springs, cables, pulleys,
brackets, or their hardware, ALL of which
are under EXTREME tension.
• ALWAYS call a trained door systems
technician if garage door binds, sticks, or is
out of balance. An unbalanced garage
door might NOT reverse when required.
• DO NOT enable the Timer-to-Close
functionality if operating either one-piece or
swinging garage doors.To be enabled
ONLY when operating a sectional door.
1Determine the header bracket location
NOTE: If you are installing the garage door opener on a one-piece door, visit www.liftmaster.com for
installation instructions.
1.1 Close the door and mark the inside vertical centerline of the garage door.
1.2 Extend the line onto the header wall above the door.
Youcan fastenthe headerbracket within 4 feet (1.22 m) of the left orright of the door
center only if a torsion springor center bearing plate is in the way; or you can attach it to
the ceilingwhenclearance is minimal.(It may be mounted on the wallupside down if
necessary, to gain approximately 1/2" (1 cm).
If you need to install the header bracket on a 2x4 (on wall or ceiling), use lag screws (not
provided) to securely fasten the 2x4 to structural supports.
1.3 Open your door to the highestpointof travel as shown.Draw an intersecting horizontal line on
the header wall 2" (5 cm) above the high point. This heightwill provide travel clearance for the
top edge of the door.
NOTE: If the total number of inches exceeds the height available in your garage, use the maximum
height possible, or refer to page 8 for ceiling installation.
Sectional door with curved track
Header Wall
Track
2" (5 cm)
Highest Point
of Travel
Door
Header Wall
Unfinished
Ceiling
Vertical Centerline
of Garage Door 2x4
2x4
Structural
Supports
Level
(Optional)
OPTIONAL
CEILING
MOUNT FOR
HEADER
BRACKET
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N/NW Chicago & suburban IL Lift-Master dealer

8
You can attach the header bracket either to the
wall above the garage door,or to the ceiling.
Follow the instructions which will work best for
your particular requirements. Do not install the
header bracket over drywall. If installing into
masonry, use concrete anchors (not provided).
HARDWARE
Lag Screw
5/16" - 9 x 1-5/8"
OPTION A WALL INSTALLATION
2.1A Center the bracketon the vertical
centerline with the bottom edge ofthe
bracket on the horizontal line as shown
(with the arrowpointing toward the
ceiling).
2.2A Mark the vertical set of bracket holes (do
not use the holes designated for ceiling
mount). Drill 3/16" pilot holes and fasten
the bracketsecurely to a structural
support with lag screws.
OPTION B CEILING INSTALLATION
2.1B Extend the vertical centerline onto the
ceiling as shown.
2.2B Center the bracketon the vertical mark,
no more than 6" (15 cm) from the wall.
Make sure the arrow ispointing toward
the wall. The bracket can be mounted
flush against the ceiling when clearance
is minimal.
2.3B Mark the side holes. Drill 3/16" pilot holes
and fasten bracket securely to a structural
support with lag screws.
Wall Mount
Optional
Mounting
Holes
Vertical
Centerline of
Garage Door
(Header Wall)
Header
Bracket
2x4 Structural
Support
Door Spring
(Garage Door)
Highest Point of
Garage Door
Travel
Horizontal
Line
Lag Screw
5/16" - 9 x 1-5/8"
(Header Wall)
Ceiling Mounting Holes
(Finished Ceiling)
Vertical
Centerline of
Garage Door
Header
Bracket
6" (15 cm)
Maximum
Door Spring
(Garage Door)
Lag Screw
5/16" - 9 x 1-5/8"
Installation
2 Install the Header Bracket
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www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

9
3.1 Align the rail with the header bracket.
Insert the clevispin through the holes in
the header bracket and rail. Secure
with the ring fastener.
NOTE: Use the packing material as a
protective base for the garage door opener.
Ring
Fastener
Clevis Pin
5/16" X 2-3/4"
HARDWARE
Clevis Pin
5/16" x 2-3/4" Ring Fastener
4Position the garage door opener
To preventdamage to garage door,restgarage
door opener rail on 2x4 placed on top section of
door.
4.1 Remove the packing material and lift the
garage door opener onto a ladder.
NOTE: A 2x4 is ideal for setting the distance
between the rail and the door. If the ladder is
not tall enough you will need help at this point.
4.2 Fully open the door and place a 2x4 (laid flat) under the rail.
NOTE: If the door hits the trolley when it is raised, pull the trolley release arm down to
disconnect the inner and outer trolley. Slide the outer trolley toward the garage door opener.
The trolley can remain disconnected until instructed.
Connected Disconnected
3Attach the rail to the header bracket
Compliments of Garage Door Corp, Skokie, IL
www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

10
5Hang the garage door opener
To avoid possible SERIOUS INJURY from a falling
garage door opener, fasten it SECURELY to
structural supports of the garage. Concrete anchors
MUST be used ifinstalling ANY bracketsinto
masonry.
HARDWARE
Hex Bolt 5/16"- 18x7/8"
Nut 5/16"-18
Lock Washer
5/16"
Installation
Hanging your garage door opener will vary depending on your
garage. Two representative installations are shown. Yours may
be different.Hanging bracketsshould be angled (Figure 1) to
provide rigid support. On finished ceilings (Figure 2),attach a
sturdymetal bracketto structural supports before installing the
opener. This bracketand fastening hardware are not provided.
Instructions below are for attaching the garage door opener
directly to structural supports.
5.1 Measure the distance from each side of the motor unit to
the structural support.
5.2 Cut both pieces of the hanging bracket to required lengths.
5.3 Drill 3/16" pilot holes in the structural supports.
5.4 Attach one end ofeach bracket to a support with 5/16"-
18x1-7/8" lag screws (not provided).
5.5 Fasten the opener to the hanging brackets with 5/16"-
18x7/8" hex bolts, lock washers and nuts.
5.6 Checkto make sure the rail is centered over the door (or in
line with the header bracket ifthe bracketis not centered
above the door).
5.7 Remove the 2x4.Operate the door manually. If the door
hitsthe rail, raise the header bracket.
NOTE: DO NOT connect power to opener at this time.
FIGURE 1 FIGURE 2
(Not Provided)
Lag Screws
5/16"- 18x1-7/8"
Measure
Distance
Hex Bolt 5/16"- 18x7/8", Lock Washer 5/16", Nut 5/16"-18
FIGURE 3
Not Provided
Finished Ceiling
Unfinished Ceiling
Compliments of Garage Door Corp, Skokie, IL
www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer