Chamberlain LiftMaster Premium 8355 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:
.

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 maycome from something
mechanical or from electric shock. Read the
warnings carefully.
Mechanical
Electrical
When you see this Signal Word on the following
pages, it will 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 check for
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 of the
door.Any gap 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. If there 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
outof 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 prevent damage 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

3
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Carton Inventory
A.tekcarbredaeH
B.Pulley and bracket
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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

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 bolt and lock nut from the top
ofthe garage door opener.
1.2 Align the rail and the styrofoamover 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 beltaround the garage
door opener sprocket.
1.5 Attach the sprocket cover over the
garage door opener sprocketand
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

5
2Tighten the Belt
2.1 By hand, thread the spring trolley nut on the threaded shaft until it is finger tight against
the trolley.Do not use any tools.
Spring Trolley Nut
(To motor unit)
2.2 Insert a flathead screwdriver tip into one ofthe nut ring slotsand brace itfirmlyagainstthe 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 snaps the 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)