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
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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
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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
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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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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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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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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
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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
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N/NW Chicago & suburban IL Lift-Master dealer

11
To preventpossible OVERHEATING of the end panel or light socket:
• Use ONLY A19 incandescent (100Wmaximum) or compactfluorescent (26Wmaximum) light
bulbs.
• DO NOT use incandescent bulbs larger than 100W.
• DO NOT use compact fluorescent light bulbs larger than 26W (100W equivalent).
• DO NOT use halogen bulbs.
• DO NOT use short neck or specialty light bulbs.
6.1 Pull on the top center of the light lens and rotate the
light lens down.
6.2 Insertan A19 incandescent (100W maximum) or
compact fluorescent (26W, 100Wequivalent)light
bulb into the light socket.
NOTE: Do not use halogen, short neck, or specialty light
bulbs as these may overheat the end panel or light socket.
Do not use LED bulbs as they may reduce the range or
performance of your remote control(s).
6.3 Rotate the lens up to close.
or or
7Attach the emergency release rope and handle
To preventpossible SERIOUS INJURY or DEATHfrom a falling garage door:
• If possible, use emergencyrelease handle to disengage trolley ONLY when garage door is
CLOSED. Weak or broken springs or unbalanced door could resultin an open door falling
rapidly and/or unexpectedly.
• NEVER use emergency release handle unless garage doorway is clear of persons and
obstructions.
• NEVER use handle to pull door open or closed. Ifrope knot becomesuntied, you could fall.
7.1 Insertone end of the emergencyrelease rope
through the handle. Make sure that “NOTICE” is
rightside up. Tie a knot at least1 inch (2.5 cm) from
the end of the emergency release rope.
7.2 Insertthe other end of the emergency release rope
through the hole in the trolley release arm.Mount
the emergency release within reach, but at least 6
feet (1.83 m) above the floor, avoiding contact with
vehicles to prevent accidental release and secure
with a knot.
NOTE: If it is necessary to cut the emergency release rope,
seal the cut end with a match or lighter to prevent
unraveling. Ensure the emergency release rope and
handle are above the top of all vehicles to avoid
entanglement.
Trolley
Release Arm
6Install the light bulbs
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N/NW Chicago & suburban IL Lift-Master dealer

12
Fiberglass, aluminum or lightweight steel garage doors WILLREQUIRE reinforcement BEFORE
installation ofdoor bracket. Contact your door manufacturer for reinforcement kit.
Figure 1 showsone piece ofangle iron as the horizontal brace.
For the vertical brace,2 pieces of angle iron are used to create a
U-shaped support. The bestsolution is to check with your garage
door manufacturer for an opener installation door reinforcement
kit.
NOTE: Many door reinforcement kits provide for direct attachment
of the clevis pin and door arm. In this case you will not need the
door bracket; proceed to the next step.
Self-Threading Screw
1/4"-14x5/8"
HARDWARE
SECTIONALDOORS
8.1 Center the door bracket on the previouslymarked vertical centerline used for the header bracket
installation.Note correctUP placement, as stamped inside the bracket.
8.2 Position the top edge ofthe bracket2"-4" (5-10 cm) below the top edge ofthe door, OR directly below
any structural support across the top of the door.
8.3 Mark, drill holes and install as follows, depending on your door’s construction:
Metal orlight weight doors usinga vertical angle iron brace between the door panel support
and the door bracket:
• Drill 3/16" fastening holes.Secure the door bracket using the two self threading screws.
(Figure 2)
• Alternately, use two 5/16" bolts, lock washers and nuts (not provided). (Figure 3)
Metal,insulated or light weight factory reinforced doors:
• Drill 3/16" fastening holes.Secure the door bracket using the self-threading screws. (Figure 4)
Wood Doors:
• Use top and bottom or side to side door bracket holes.Drill 5/16” holes through the door and
secure bracket with 5/16"-18x2" carriage bolts, lock washers and nuts(notprovided). (Figure 5)
NOTE: The 1/4"-14x5/8" self-threading screws are not intended for use on wood doors.
8Install the door bracket
A horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, aluminum, steel, doors
with glass panel, etc.) (not provided).
A horizontal reinforcement brace
should be long enough to be secured
to two or three vertical supports.
A vertical reinforcement brace should
cover the height of the top panel.
FIGURE 1
FIGURE 2
FIGURE 4 FIGURE 5
FIGURE 3
Vertical Reinforcement
Vertical Centerline
of Garage Door
UP
Door Bracket
Self-Threading Screw
1/4" - 14x 5/8"
Self-Threading
Screw
1/4" - 14x 5/8"
Vertical Reinforcement
Bolt 5/16"-18x2"
(Not provided)
Lock Washer 5/16"
Nut 5/16"-18
Door Bracket
UP
Vertical Centerline
of Garage Door
UP
Vertical
Centerline of
Garage Door
Bolt 5/16"-18x2"
(Not provided)
UP
Inside Edge of Door or
Reinforcement Board
Vertical Centerline
of Garage Door
Installation
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N/NW Chicago & suburban IL Lift-Master dealer

13
IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm.
Straight
Door Arm Curved
Door
Arm
(Groove
facing out)
CORRECT
INCORRECT
Straight
Door
Arm Curved
Door
Arm
9.1 Close the door. Disconnect the trolley by
pulling the emergency release handle.
Slide the outer trolley back (away from
the door) about 2" (5 cm).
9.2 Attach the straight door arm to the outer
trolley using the clevis pin. Attach with
the ring fastener.
Ring
Fastener
Clevis Pin
5/16" x 1"
9.3 Attach the curved door arm to the door
bracket using the clevispin. Attach with
the ring fastener.
Ring
Fastener
Clevis Pin
5/16" x 1-1/4"
HARDWARE
Hex Bolt 5/16"-18x7/8"
Nut
5/16"-18
Lock
Washer
5/16"
Clevis Pin
5/16"x1"
Clevis Pin 5/16"x1-1/4"
Ring Fastener
9.4 Align the straight door arm with the
curved door arm. Select two aligned
holes (as far apart as possible) and
attach using the bolts, nuts and lock
washers.
Nut 5/16" - 18
Lock
Washer
5/16"
Hex Bolt
5/16" - 18 x 7/8"
NOTE: If the holes do not line up, reverse the
straight door arm. Select two aligned holes (as
far apart as possible) and attach using the
bolts, nuts and lock washers.
If the straight door arm is hanging
down too far, you may cut 6 inches
(15 cm) from the solid end.
Nut 5/16" - 18
Lock
Washer
5/16"
Hex Bolt
5/16" - 18 x 7/8"
9.5 Pull the emergency release handle
toward the garage door opener until the
trolley release arm is horizontal. The
trolley will re-engage automatically when
the garage door opener is activated.
Trolley
release arm
9 Connect the door arm to the trolley
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N/NW Chicago & suburban IL Lift-Master dealer

14
1Install the door control
Install the Door Control
To prevent possible SERIOUS INJURY or DEATHfrom electrocution:
• Be sure power is NOT connected BEFORE installing door control.
• ConnectONLY to 12 VOLT low voltage wires.
To preventpossible SERIOUS INJURY or DEATHfrom a closing garage door:
• Install door control within sight of garage door, out of reach of children at a minimum height of 5 feet
(1.5 m),and away from ALL moving partsof door.
• NEVER permitchildren to operate or play with door control push buttons or remote control
transmitters.
• Activate door ONLY when itcan be seen clearly,is properly adjusted,and there are no
obstructions to door travel.
• ALWAYS keep garage door in sight until completely closed. NEVER permit anyone to cross path of
closing garage door.
INTRODUCTION
Compatible with MyQ®and Security+2.0™
accessories, see page 37.Your garage door
opener is compatible with up to 2 SmartControl
Panels or 4 of anyother Security+2.0™ door
controls. NOTE:Older LiftMaster door controls
and third party products are not compatible.
Install the door control within sight ofthe door at
a minimumheight of5 feet (1.5 m) where small
children cannot reach, and away from the
moving parts of the door.
NOTE: Your product may look different than
moving parts of the door the illustrations.
Screw
6ABx1"
HARDWARE
Drywall
Anchors
Screw
6-32x1"
NOTE: For gang box installations it is not necessary to drill holes or install the drywall anchors. Use the existing holes in the gang box.
1.1 Strip 7/16 inch (11 mm) ofinsulation from
one end of the wire and separate the wires.
7/16"
(11 mm)
1.2 Connect one wire to each ofthe two screws
on the backof the door control. The wires
can be connected to either screw.
PRE-WIREDINSTALLATIONS:Choose
any two wires to connect, note which wires
are used so the correct wires are connected
at the garage door opener in a later step.
1.3 Mark the location of the bottom mounting
hole and drill a 5/32 inch (4 mm) hole.
Wall
1.4 Install the bottom screw, allowing 1/8 inch
(3 mm) to protrude from the wall.
Screw
6-32 x 1"
DRYWALL GANG BOX
Screw
6AB x 1"
Drywall Anchor
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www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

15
k
Install the Door Control
1.5 Position the bottom hole of the door
control over the screw and slide
down into place.
1.6 Liftthe push bar up and mark the top hole. 1.7 Remove the door control from the wall
and drill a 5/32 inch (4 mm) hole for
the top screw.
1.8 Position the bottom hole of the
door control over the screw and
slide down into place.Attach the
top screw.
DRYWALL
Drywall Anchor
Screw
6-32 x 1"
Screw
6AB x 1"
GANG BOX
2Wire the door control to the garage door opener
HARDWARE
Insulated Staple
(Not shown)
PRE-WIRED INSTALLATIONS: When wiring
the door control to the garage door opener
make sure you use the same wires that are
connected to the door control.
2.1 Run the white and red/white wire from the door control to
the garage door opener. Attach the wire to the wall and
ceiling with the staples (not applicable for gang box or
pre-wired installations).Do not pierce the wire with the
staple as this may cause a shortor an open circuit.
Staple
2.2 Strip 7/16 inch (11 mm) ofinsulation
from the end of the wire near the
garage door opener.
7/16"
(11 mm)
2.3 Connect the wire to the red and
white terminals on the garage
door opener. To insert or
release wires from the terminal,
push in the tab with screwdriver
tip.
RED
WHITE
WHITE
GREY
WHI
WHITE
E
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www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

16
Install the Door Control
3Attach the warning labels
3.1 Attach the entrapment warning label on the wall near the door control with tacks or
staples.
3.2 Attach the manual release/safety reverse testlabel in a visible location on the inside of
the garage door.
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www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

17
Introduction
Be sure power is NOT connected to the garage
door opener BEFORE installing the safety
reversing sensor.
To prevent SERIOUS INJURY or DEATH from
closing garage door:
• Correctly connectand align the safety
reversing sensor.Thisrequired safety
device MUST NOT be disabled.
• Install the safety reversing sensor so beam
is NO HIGHER than 6" (15 cm) above
garage floor.
Install the Protector System®
IMPORTANTINFORMATIONABOUTTHESAFETYREVERSINGSENSORS
The safety reversing sensors must be connected and aligned correctly before the garage door opener will move in the down direction.
The sending sensor (with an amber LED) transmitsan invisible lightbeam to the receiving sensor (with a green LED). Ifan obstruction breaksthe light
beam while the door is closing, the door will stop and reverse to the full open position,and the garage door opener lights will flash 10 times.
NOTE: For energy efficiency the garage door opener will enter sleep mode when the door is fully closed. The sleep mode shuts the garage door
opener down until activated. The sleep mode is sequenced with the garage door opener light bulb; as the light bulb turns off the sensor LEDs will turn
offand whenever the garage door opener lights turn on the sensor LEDs will light.The garage door opener will not go into the sleep mode until the
garage door opener has completed 5 cycles upon power up.
When installing the safety reversing sensors check the following:
• Sensors are installed inside the garage, one on either side of the door.
• Sensors are facing each other with the lenses aligned and the receiving sensor lens does not receive directsunlight.
• Sensors are no more than 6 inches (15 cm) above the floor and the lightbeam is unobstructed.
Invisible Light Beam
Protection Area
Safety Reversing Sensor
6" (15 cm) max. above floor Safety Reversing Sensor
6" (15 cm) max. above floor
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www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

Install the Protector System®
1Install the Safety Reversing Sensors
The safety reversing sensors can be attached to the door track, the wall, or the floor. If the door trackwill not support the sensor bracketa wall installation is recommended.Choose one of the following installations.
HARDWARE
Carriage Bolt
1/4"-20x1/2"
Wing Nut
1/4"-20
OPTION A DOOR TRACK INSTALLATION
1.1A Slide the curved arms of the sensor
bracket around the edge ofthe door
track. Snap into place so that the
sensor bracket is flush against the
track.
1.2A Slide the carriage boltinto the slot on
each sensor.
Carriage Bolt
1/4" - 20 x 1/2"
1.3A Insert the bolt through the hole in the sensor
bracket and attach with the wing nut.The lenses
on both sensors should point toward each other.
Make sure the lens is not obstructed by the
sensor bracket.
Wing Nut
1/4" - 20
OPTION B WALLINSTALLATION
If additional clearance is needed an extension bracket (not provided) or wood blocks can be used. Make sure each bracket has the same amount ofclearance so they will align correctly.
1.1B Position the sensor bracket against the
wall with the curved arms facing the
door.Make sure there is enough
clearance for the beam to be
unobstructed. Mark holes.
(not provided)
1.2B Drill 3/16 inch pilot holes for each sensor
bracket and attach the sensor brackets
to the wall using lag screws (not
provided).
Inside
Garage
Wall
(not provided)
1.3B Slide the carriage boltinto the slot on
each sensor.
Lens
Carriage Bolt
1/4" - 20 x 1/2"
1.4B Insert the bolt through the hole in the sensor
bracket and attach with the wing nut.The lenses
on both sensors should point toward each
other. Make sure the lensis not obstructed by
the sensor bracket.
Wing Nut
1/4" - 20
18
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www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

Install the Protector System®
1 Install the Safety Reversing Sensors
OPTION C FLOOR INSTALLATION
Use an extension bracket(notprovided) or wood block to raise the sensor bracketif needed.
1.1C Carefullymeasure the position of both
sensor brackets so they will be the same
distance from the wall and unobstructed.
1.2C Attach the sensor bracketsto the floor
using concrete anchors (not
provided).
Inside
Garage
Wall
(not provided)
1.3C Slide the carriage boltinto the slot on
each sensor.
Carriage Bolt
1/4" - 20 x 1/2"
1.4C Insert the bolt through the hole in the sensor
bracket and attach with the wing nut.The lens
on both sensors should point toward each
other. Make sure the lensis not obstructed by
the sensor bracket.
Wing Nut
1/4" - 20
2 Wire the Safety Reversing
Sensors OPTION A INSTALLATION WITHOUT PRE-WIRING
PRE-WIRED INSTALLATIONS: If your garage
already has wires installed for the safety reversing
sensors, see page 20.
HARDWARE
Insulated Staple
(Not shown)
2.1A Run the wire from both sensors to the
garage door opener. Attach the wire to
the wall and ceiling with the staples.
Staple
2.2A Strip 7/16 inch (11 mm) ofinsulation
from each set of wires. Separate the
wires. Twist the white wires together.
Twist the white/black wires together.
7/16"
(11 mm)
2.3A Insert the white wires into the white terminal on
the garage door opener. Insert the white/black
wires into the grey terminal on the garage door
opener. To insert or remove the wires from the
terminal, push in the tab with a screwdriver tip.
RED
WHITE
WHITE
GREY
D
RED
W
RE
WHITE
WHITE
GREY
GREY
19
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www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer

Install the Protector System®
OPTION B PRE-WIRED INSTALLATION
2.1B Cutthe end of the safety
reversing sensor wire, making
sure there is enough wire to
reach the pre-installed wires
from the wall.
2.2B Separate the safetyreversing sensor wires and strip 7/16 inch (11 mm) of
insulation from each end.Choose two ofthe pre-installed wires and strip 7/16
inch (11 mm) of insulation from each end. Make sure that you choose the
same color pre-installed wires for each sensor.
7/16"
(11 mm)
7/16"
(11 mm)
Safety reversing sensor wires
Pre-installed
wires
2.3B Connectthe pre-installed wires to the sensor wires with wire nuts
making sure the colors correspond for each sensor.For example,
the white wire would connectto the yellow wire and the white/black
wire would connectto the purple wire.
White
White/Black
Yellow
(for example)
Purple
(for example)
Not Provided
Pre-installed
wires
Safety reversing sensor wires
2.4B At the garage door opener,strip 7/16 inch (11 mm) ofinsulation from each end ofthe wires previouslychosen for the
safety reversing sensors. Twist the like-colored wires together.
7/16"
(11 mm)
Yellow
Purple
2.5B Insert the wires connected to the white safety sensor wires to the
white terminal on the garage door opener. Insertthe wires that are
connected to the white/black safetysensor wires to the grey
terminal on the garage door opener.
RED
WHITE
WHITE
GREY
D
W
RED
RE
Purple
(for example)
Yellow
(for example)
To insert or remove the wires
from the terminal, push in the
tab with a screwdriver tip.
WHITE
WHITE
GREY
GREY
20
Compliments of Garage Door Corp, Skokie, IL
www.gdcorp.com
N/NW Chicago & suburban IL Lift-Master dealer