Chamberlain LiftMaster Professional Security+ 3500C User manual

Owner’s Manual
■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 opener are required to ensure safe operation.
■The model number label is located on the front of your opener.
GARAGE DOOR OPENER
Model 3500C
For Residential Use Only
The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
®
New!
Optional Accessory
Available
See Page 35 for the New

2
Introduction 2-5
Safety symbol review and signal word review ............2
Preparing your garage door ........................................3
Tools ............................................................................3
Planning .....................................................................4
Carton inventory..........................................................5
Hardware inventory .....................................................5
Assembly 6-7
Fasten rail to the motor unit ........................................6
Set the belt tension .....................................................6
Attach the belt cap retainer .........................................7
Installation 7-23
Installation safety instructions .....................................7
Determine the header bracket location....................8-9
Install the header bracket..........................................10
Attach the rail to the header bracket .........................11
Position the opener ...................................................12
Hang the opener .......................................................13
Install the door control...............................................14
Install the lights and lens...........................................15
Attach the emergency release rope and handle .......15
Electrical requirements..............................................16
Install The Protector System®..............................17-19
Fasten the door bracket.......................................20-21
Connect the door arm to the trolley .....................22-23
Adjustment 24-26
Program the travel limits ...........................................24
Setting the force ........................................................25
Test the safety reversal system.................................26
Test The Protector System®......................................26
Operation 27-30
Operation safety instructions.....................................27
Using your garage door opener ................................27
Using the door control...............................................28
To open the door manually........................................28
Care of your garage door opener..............................29
Having a problem?...............................................29-30
Programming 31-32
To add or reprogram a hand-held remote control .....31
To erase all codes .....................................................31
3-Button Remotes .....................................................31
To add, reprogram or change
a Keyless Entry PIN ..................................................32
Repair Parts 33-34
Rail assembly parts...................................................33
Installation parts ........................................................33
Motor unit assembly parts.........................................34
Accessories 35
Repair Parts and Service 36
Warranty 36
TABLE OF CONTENTS
INTRODUCTION
Safety Symbol Review
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.
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
WARNING
CAUTION WARNING
WARNING
WARNING
CAUTION WARNING
WARNING
WARNING
CAUTION
WARNING
WARNING

3
Preparing your garage door
Before you begin:
• Disable locks.
• Remove any ropes connected to garage door.
• Complete the following test to make sure your
garage door is balanced and is not sticking or
binding:
1. Lift the door about halfway as shown. Release
the door. If balanced, it should stay in place,
supported entirely by its springs.
2. Raise and lower the door to see if there is any
binding or sticking.
If your door binds, sticks, or is out of balance, call
a trained door systems technician.
To prevent damage to garage door and opener:
• ALWAYS disable locks BEFORE installing and operating
the opener.
• ONLY operate garage door opener at 120V, 60 Hz to
avoid malfunction and damage.
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 installing and operating garage
door opener to avoid entanglement.
WARNING
CAUTION WARNING
WARNING
WARNING
CAUTION
WARNING
WARNING
Tools needed
During assembly, installation and adjustment of the
opener, instructions will call for hand tools as
illustrated below.
Pliers
Wire Cutters
Claw Hammer
Hack Saw
Screwdriver Adjustable End Wrench
1/2" and 7/16" Sockets
and Wrench
Drill
Tape Measure
2
1
Stepladder
Pencil
3/16", 5/16" and
5/32" Drill Bits
Carpenter's
Level (Optional)
Sectional Door
One-Piece Door

Safety
Reversing Sensor
Horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, steel, aluminum, door with
glass panels, etc.). See page 20 for details.
— — — — — — — —
Header Wall
Safety
Reversing
Sensor
Support bracket &
fastening hardware
is required. See page 13.
FINISHED CEILING
Extension Spring
OR Torsion Spring
Motor unit
Wall-mounted
Door Control
Rail
Access Door
Gap between floor
and bottom of door must not exceed 1/4" (6 mm).
Vertical
Centerline
of Garage Door
4
SECTIONAL DOOR INSTALLATION
Planning
Identify the type and height of your garage door. Survey your garage area to see if any of the conditions below
apply to your installation. Additional materials may be required. You may find it helpful to refer back to this page
as you proceed with the installation of your opener.
Safety Reversing Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required. See page 13.
Safety
Reversing
Sensor
Header Wall
Access Door
Gap between floor
and bottom of door
must not exceed 1/4" (6 mm).
Motor unit
Wall-mounted
Door Control
Rail
Access
Door
Safety
Reversing Sensor
Safety
Reversing
Sensor
Gap between floor
and bottom of door
must not exceed 1/4" (6 mm).
ONE-PIECE DOOR WITHOUT TRACK
ONE-PIECE DOOR WITH TRACK

5
Straight Door
Arm Section
Curved Door
Arm Section
Header Bracket
UP
CEILINGMOUNTONLY
2-Conductor Bell Wire
White & White/Red
Safety Labels
and
Literature
Remote Control
Transmitter Visor Clip
Door Bracket
SECURITY✚®
3-Button Remote Control
(2) Safety Reversing Sensors
(1 Sending Eye and 1 Receiving Eye)
with 2-Conductor White & White/Black
Bell Wire attached
Safety Sensor
Bracket (2)
Belt Cap Retainer
One-Piece
T-rail
Styrofoam
Belt
Pulley Bracket
Belt
Trolley
Motor Unit with Light Lens
Rail Grease
LOCKLIGHT
Motion Detecting
Door Control Panel
Your garage door opener is packaged in two cartons
which contain the motor unit and the parts illustrated
below. Note that accessories will depend on the
model purchased. If anything is missing, carefully
check the packing material. Parts may be stuck in the
foam. KEEP THE FOAM INTACT (see page 6.)
Carton Inventory
Hardware Inventory
INSTALLATION HARDWARE
Hex Screw #8x3/8" (3)
Hex Bolt 5/16"-18x7/8" (4)
Lag Screw 5/16"-9x1-5/8" (2)
Lag Screw 5/16"-18x1-7/8" (2)
Self-Threading Screw 1/4"-14x5/8" (2)
Clevis Pin 5/16"x2-3/4" (1)
Clevis Pin 5/16"x1-1/4" (1)
Clevis Pin 5/16"x1" (1)
Nut 5/16"-18 (4)
Lock Washer 5/16" (4)
Screw 6ABx1-1/4" (2)
Screw 6-32x1" (2)
Insulated Staples (30)
Ring Fastener (3)
Handle
Drywall Anchors (2)
Rope
Carriage Bolts 1/4"-20x1/2" (2)
Wing Nut 1/4"x20 (2)

ASSEMBLY STEP 1
Attach the Rail to the Motor Unit
To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
• Remove the two washered bolts mounted in top of
motor unit.
• Align rail and styrofoam over sprocket. Cut tape
from rail, belt and styrofoam.
• REMOVE STYROFOAM.
• Insert both washered bolts through the rail into the
motor unit. Tighten bolts securely.
Use only these bolts! Use of any other bolts
will cause serious damage to door opener.
• Position belt over the motor unit sprocket.
6
Motor Unit
Sprocket
Foam Packaging
Washered Bolts
5/16"-18x1/2"
ASSEMBLY STEP 2
Set the Belt Tension
• By hand, thread the spring trolley nut on the threaded
shaft until it is finger tight against the trolley (Figure 1).
Do not use any tools.
• Insert a screwdriver tip into one of the nut ring slots and
brace it firmly against the trolley (Figure 2).
• Place a 7/16" (11 mm) open end wrench on the
square end. Rotate about 1/4 turn until the spring
releases and snaps the nut ring against the trolley
(Figure 3).
This extends the spring for optimum belt tension.
Trolley
Threaded
Shaft
Spring/Trolley Nut
Nut
Ring
Trolley
Threaded
Shaft
Nut Ring
Slots
Square
End
Figure 1
Figure 2
Nut Ring Trolley Nut Ring Trolley
1" (2.5 cm) 1-1/4" (3.18 cm)
BEFORE AFTER RELEASE
Figure 3
To avoid SERIOUS damage to garage door opener,
use ONLY those bolts/fasteners mounted in the top of
the opener.
WARNING
CAUTION
WARNING
WARNING

ASSEMBLY STEP 3
Attach the Belt Cap Retainer
• Position the belt cap retainer over the opener
sprocket so the two holes in cap align with the two
holes in mounting plate. Attach 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.
7
Hex Screws
#8x3/8"
Belt Cap
Retainer
Opener Sprocket
Mounting
Plate
IMPORTANT INSTALLATION INSTRUCTIONS
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 emergency release handle 6 feet (1.83 m)
above floor.
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:
• 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 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.
To reduce the risk of SEVERE INJURY or DEATH:
WARNING
WARNING
WARNING
INSTALLATION
Hex Screw
#8x3/8"
HARDWARE SHOWN ACTUAL SIZE
To avoid possible SERIOUS INJURY to fingers from
moving garage door opener:
• ALWAYS keep hand clear of sprocket while operating
opener.
• Securely attach sprocket cover BEFORE operating.
WARNING
CAUTION WARNING
WARNING

8
INSTALLATION STEP 1
Determine the Header Bracket
Location
Installation procedures vary according to garage door
types. Follow the instructions which apply to your
door.
SECTIONAL DOOR
AND ONE-PIECE DOOR WITH TRACK
1. Close the door and mark the inside vertical
centerline of the garage door.
2. Extend the line onto the header wall above the
door.
You can fasten the header bracket within 4 feet
of the left or right of the door center only if a
torsion spring or center bearing plate is in the
way; or you can attach it to the ceiling (see
page 10) when clearance is minimal (It may be
mounted on the wall upside 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 as
shown here and on page 10.
3. Open your door to the highest point of travel as
shown. Draw an intersecting horizontal line on the
header wall 2" (5 cm) above the high point. This
height will provide travel clearance for the top edge
of the door.
Proceed to Step 2, page 10.
To prevent possible SERIOUS INJURY or DEATH:
• Header bracket MUST be RIGIDLY fastened to
structural support on 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.
WARNING
CAUTION WARNING
WARNING
Header Wall
Sectional door with curved track
Highest Point
of Travel
Door
2" (5 cm) Track
One-piece door with horizontal track
Door
Track
Header Wall
Highest Point
of Travel
2" (5 cm)
Unfinished
Ceiling OPTIONAL
CEILING
MOUNT
FOR
HEADER
BRACKET
Header Wall
2x4 Structural
Supports
Vertical Centerline
of Garage Door
Level
(optional)
2x4

9
ONE-PIECE DOOR WITHOUT TRACK
1. Close the door and mark the inside vertical
centerline of your garage door. Extend the line
onto the header wall above door, as shown.
If headroom clearance is minimal, you can install
the header bracket on the ceiling. See page 10.
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
as shown. If installing into masonry, use concrete
anchors (not provided).
2. Open your door to the highest point of travel as
shown. Measure the distance from the top of the
door to the floor. Subtract the actual height of the
door. Add 8" (20 cm) to the remainder.
(See Example).
3. Close the door and draw an intersecting horizontal
line on the header wall at the determined height.
NOTE: If the total number of inches exceeds the
height available in your garage, use the maximum
height possible, or refer to page 10 for ceiling
installation.
EXAMPLE
Distance from top of door
(at highest point of travel) to floor . . . . .92" (234 cm)
Actual height of door . . . . . . . . . . . . . . .-88" (224 cm)
Remainder . . . . . . . . . . . . . . . . . . . . . . 4" (10 cm)
Add . . . . . . . . . . . . . . . . . . . . . . . . . . . +8" (20 cm)
Bracket height on header wall . . . . . . . 12" (30 cm)
(Measure UP from top of CLOSED door.)
Proceed to Step 2, page 10.
Header Wall
Vertical
Centerline
of Garage
Door
2x4
Unfinished
Ceiling
2x4
OPTIONAL
CEILING MOUNT
FOR
HEADER BRACKET
Structural
Supports
Door
Pivot
8" (20 cm)
One-piece door without track:
pivot hardware
Highest
Point
of Travel
Header Wall
Door
Jamb
Hardware
One-piece door without track:
jamb hardware
8" (20 cm)
Highest
Point
of Travel
Header Wall

10
INSTALLATION STEP 2
Install the Header Bracket
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).
WALL HEADER BRACKET INSTALLATION
• Center the bracket on the vertical centerline with
the bottom edge of the bracket on the horizontal
line as shown (with the arrow pointing toward the
ceiling).
• Mark the vertical set of bracket holes (do not use
the holes designated for ceiling mount). Drill 3/16"
pilot holes and fasten the bracket securely to a
structural support with the hardware provided.
Lag Screws
5/16"-9x1-5/8"
Highest Point of
Garage Door Travel
Vertical
Centerline of
Garage Door
Header
Wall
Garage
Door
UP
CEILING MOUNT ONLY
Wall Mounting Holes
Optional
Wall Mounting Holes
The nail hole is for
positioning only.
You must use lag screws
to mount the header bracket.
UP
CEILINGMOUNT ONLY
Door Spring
Header
Bracket
2x4
Structural
Support
Vertical
Centerline of
Garage Door
Horizontal
Line
UP
CEILING MOUNT ONLY
Ceiling Mounting Holes
The nail hole is for
positioning only.
Youmust use lag screws
to mount the header bracket.
UP
Lag Screws
5/16"-9x1-5/8"
Garage Door
Vertical
Centerline
of Garage Door
Header Wall
– Finished Ceiling–
Header
Bracket
6" (15 cm)
Maximum
Vertical
Centerline
of Garage Door
Door
Spring
CEILING HEADER BRACKET INSTALLATION
• Extend the vertical centerline onto the ceiling as
shown.
• Center the bracket on the vertical mark, no more
than 6" (15 cm) from the wall. Make sure the arrow
is pointing toward the wall. The bracket can be
mounted flush against the ceiling when clearance
is minimal.
• Mark the side holes. Drill 3/16" pilot holes and
fasten bracket securely to a structural support with
the hardware provided.
Lag Screw
5/16"-9x1-5/8"
HARDWARE SHOWN ACTUAL SIZE