Chamberlain 3800C 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®and cable tension monitor are
connected and properly aligned.
■Periodic checks of the opener are required to ensure safe operation.
■The model number label is located behind the hinged door of your opener.
GARAGE DOOR OPENER
Model 3800C
For Residential Sectional Doors With
Torsion Assemblies Only
The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
®
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2
INTRODUCTION
Safety Symbol Review
and Signal Word 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
Introduction 2-5
Safety symbol review and signal word review . . . . . . . .2
Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Preparing your garage door . . . . . . . . . . . . . . . . . . . . . .4
Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Carton inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Hardware inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Assembly 6
Attach the collar to the motor unit . . . . . . . . . . . . . . . . . .6
Attach mounting bracket to the motor unit . . . . . . . . . . .6
Installation 7-16
Installation safety instructions . . . . . . . . . . . . . . . . . . . . .7
Position the opener . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Attach the emergency release rope and handle . . . . . . .8
Install the power door lock . . . . . . . . . . . . . . . . . . . . . . .8
Attach the cable tension monitor (Required) . . . . . . . . . .9
Install the control console . . . . . . . . . . . . . . . . . . . . . . .10
Install remote light . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Electrical requirements . . . . . . . . . . . . . . . . . . . . . . . . .12
Mount the battery backup unit (BBU) . . . . . . . . . . . . . .13
Install The Protector System®. . . . . . . . . . . . . . . . . .14-16
Adjustment 17-20
Program the travel limits . . . . . . . . . . . . . . . . . . . . . . . .17
Setting the force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Test the safety reversal system . . . . . . . . . . . . . . . . . . .19
Test The Protector System®. . . . . . . . . . . . . . . . . . . . . .19
Test cable tension monitor . . . . . . . . . . . . . . . . . . . . . .20
Test power door lock . . . . . . . . . . . . . . . . . . . . . . . . . . .20
To open door manually . . . . . . . . . . . . . . . . . . . . . . . . .20
Operation 21-25
Operation safety instructions . . . . . . . . . . . . . . . . . . . . .21
Using your garage door opener . . . . . . . . . . . . . . . . . .21
Using the wall-mounted control console . . . . . . . . . . . .22
Care of your opener . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Having a problem? (Troubleshooting) . . . . . . . . . . .23-24
Diagnostic chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Programming 26-28
To add or reprogram a hand-held remote control . . . . .26
To erase all codes from motor unit memory . . . . . . . . .26
3-Button remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
To add, reprogram or change
a keyless entry PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Reprogramming light or additional light . . . . . . . . . . . .28
Repair Parts 29-30
Installation parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Motor unit assembly parts . . . . . . . . . . . . . . . . . . . . . . .30
Accessories 31
Repair Parts and Service 32
Warranty 32
TABLE OF CONTENTS

Safety
Reversing Sensor
Safety
Reversing
Sensor
Torsion Spring
Motor unit
Wall-mounted
Control Console
Access Door
Gap between floor
and bottom of door must not exceed 1/4" (6 mm).
Power
Door Lock
Cable Tension
Monitor Remote Light
Drum
3
Planning
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.
Depending on your requirements, there are several
installation steps which may call for materials or
hardware not included in the carton.
This opener is compatible with:
• Doors that use a torsion bar, springs, and a door no
more than 14' (4.2 m) high.
• 4"-6" (10 cm - 15 cm) drums, not to be used on
tapered drums over 6" (15 cm).
• High lift and standard lift sectional doors up to 14'
(4.2 m) high.
• Doors up to 18' wide.
• Doors up to 180 sq. ft.
• 1" (2.5 cm) torsion bar only.
• Review or inspect proposed installation area. Opener
can be installed on left or right side of door. Select the
side that meets the requirements listed below.
- Must have minimum of 2-1/2" (6.4 cm) between the
garage wall and the center of the torsion bar.
- Must have minimum of 3" (7.6 cm) between the
ceiling and the center of torsion bar.
- Must have minimum of 8" (20.3 cm) between the
side garage wall (or obstruction) and the end of
torsion bar.
• The torsion bar must extend at least 1" to 5" (2.5 cm to
12 cm) past the bearing plate.
• An electric outlet is required within 6' (1.8 m) of the
installation area. If outlet does not exist, contact a
qualified electrician.
• Depending upon garage construction, extension
brackets or wood blocks may be needed to install
safety reversing sensors.
• Alternate floor mounting of the safety reversing
sensors will require hardware not provided.
• A model 475LMC EverChargeTM Battery Backup
System is strongly recommended if there is no access
door to the garage, as this opener cannot be used in
conjunction with an external emergency release
mechanism.
• 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.
NOTE: Inspect the torsion bar while the door is raised
and lowered. It is important that there is no noticeable
movement up and down or left and right. If this type of
movement is not corrected, life of this opener will be
greatly reduced.

4
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.
3. Verify equal cable tension on each side of door.
Cable tension should remain equal during the entire
travel of the door. 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
ClawHammer
Screwdriver
Adjustable End Wrench
1/4", 5/16" & 3/8" Sockets
and Wrench with 6" Extension
Drill Tape Measure
2
1
Stepladder
Pencil
3/16" and 1/8"
Hex Key Wrench
Needle Nose Pliers
5/32", 3/16", 5/16"
and 3/4" Drill Bits
Sectional Door

5
2-Conductor Bell Wire
White & White/Red
Safety Labels
and
Literature
Remote Control
Visor Clip
Mounting Bracket
SECURITY✚®
3-Button Remote Control (1)
(2) Safety Reversing Sensors
(1 Sending Eye and 1 Receiving Eye)
with 2-Conductor White & White/Black
Bell Wire attached
Safety Sensor
Bracket (2)
Motor Unit
LOCKLIGHT
Motion Detecting
Control Console
Collar with Screws
Cable Tension
Monitor with 2-Conductor
Green/White Bell Wires
Power Door Lock
2-Conductor White &
White/Black Bell Wire
with Connector
Remote Light
with Hardware Bag
Carton Inventory
Your garage door opener is packaged in one carton
which contains 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.
Hardware Inventory
INSTALLATION HARDWARE
Hex Screw #14-10x1-7/8" (4)
Screw #6x-1-1/4" (2)
Machine Screw #6x1" (2)
Carriage Bolt 1/4"-20x1/2" (2)
Wing Nut 1/4"-20 (2)
Pan Head Screw 1/4"-20x1/2" (2)
Hex Head Screw #8x1" (2)
Self Tapping Screw #10-32 (2)
Drywall Anchor (2)
Drywall Anchor (Screw-In) (2)
Handle
Rope
Insulated Staples (30)
Lock Template (Located Under Access Door)

ASSEMBLY STEP 1
Attach the Collar to the Motor Unit
To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
• Loosen the collar screws.
• Attach collar to either the left or the right side of the
motor unit. Ensure that the collar is seated all the way
on motor shaft until stop is reached (Figure 1).
• Position the collar so that the screws are facing up
(accessible when attached to the torsion bar).
• Tighten both sides of collar screws equally to secure
collar to the motor unit (12-14 ft./lbs. of torque)
(Figure 2).
NOTE: For most installations the screws should be
facing up for easy access.
NOTE: Do not tighten set screws until indicated.
6
Collar Screw
Collar Screw
Set Screw
ASSEMBLY STEP 2
Attach Mounting Bracket to
Motor Unit
• Loosely attach slotted side of mounting bracket to the
same side of the motor unit as the collar, using self-
threading screws provided.
NOTE: Do not tighten until instructed.
NOTE: Illustrations shown are for left side installation.
Socket Wrench
Figure 1
RIGHT WRONG
Figure 2
Screw
#10-32
HARDWARE SHOWN ACTUAL SIZE
To prevent possible SERIOUS INJURY OR DEATH, the collar
MUST be properly tightened. The door may NOT reverse
correctly or limits may be lost due to collar slip.
WARNING
CAUTION WARNING
WARNING

7
INSTALLATION
INSTALLATION STEP 1
Position the Opener
1. Close the garage door completely.
2. Slide the opener with collar over the end of the torsion
bar. Check to make sure bracket is located on a solid
surface such as wood, concrete or door/flag bracket.
Snug collar screws to help assure proper alignment of
operator. Mark the bracket holes. It may be necessary
to cut the torsion bar if it is too long or damaged.
3. Loosen collar screws from torsion bar and remove the
opener. Drill 3/16" pilot holes at the marked locations.
Drill through steel plate if needed.
4. Reinstall the opener by sliding the collar over the
torsion bar until pilot holes align with bracket. Securely
tighten collar screws that attach to the torsion bar to
12-14 ft./lbs. of torque. Securely tighten both set
screws firmly, without damaging the jackshaft.
5. Fasten bracket securely with 14-10x1-7/8" screws.
Tighten all mounting bracket hardware.
NOTE: The motor unit does not have to be flush to wall.
6. Use a staple to secure the antenna wire to prevent
antenna from being entangled in a door roller.
To prevent possible SERIOUS INJURY or DEATH:
• Concrete anchors MUST be used if mounting bracket 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.
• Operator MUST be mounted at a right angle to the torsion
bar to avoid premature wear on the collar.
Motor unit
Staple
Torsion Bar
WARNING
CAUTION WARNING
WARNING
14-10x1-7/8" Hex Screw
HARDWARE SHOWN ACTUAL SIZE
IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
WARNING
WARNING
WARNING
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 Mount emergency release handle no higher than 6 feet
(1.83 m) above floor.
6. NEVER connect garage door opener to power source until
instructed to do so.
7. NEVER wear watches, rings or loose clothing while
installing or servicing opener. They could be caught in
garage door or opener mechanisms.
8. 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.
9. Place entrapment warning label on wall next to garage
door control.
10. Place manual release/safety reverse test label in plain view
on inside of garage door.
11. 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.

8
Staples
Lock Screw
1/4-20 x 1/2" (2)
HARDWARE SHOWN ACTUAL SIZE
Approx. 3" (7.6 cm)
Lock Template
Roller
Garage
Door Track
TOP
DRILL 5/16"
DRILL 3/4"
DRILL 5/16"
132A2505
TOP
DRILL5/16"
DRILL3/4"
DRILL5/16"
132A2505
Figure 1
INSTALLATION STEP 3
Install Power Door Lock
The lock is used to prevent the garage door from
being manually opened once the door is fully closed.
1. Select a door roller to mount the lock above. Check for
clearance. If possible select a roller on the same side
of the door as the motor unit. The second roller up
from the bottom is ideal in most installations.
2. Ensure rail surface is clean and adhere lock template
with bottom edge just above the highest point on the
roller (Figure 1).
3. Drill holes as marked on the template.
4. Fasten power door lock to the outside of the garage
door track with hardware provided.
5. Run bell wire up wall to motor unit. Use insulated
staples to secure wire in several places.
6. Plug connector into the motor unit (Figure 2).
NOTE: Lock must be mounted within 10' of the
power head.
NOTICE
Overhand
Knot
Emergency
Release Handle
Overhand
Knot
Rope
Motor Unit
Emergency
Release Cable
To prevent possible SERIOUS INJURY or DEATH from a
falling garage door:
• If possible, use emergency release handle to disengage
door ONLY when garage door is CLOSED. Weak or broken
springs or unbalanced door could result in an open door
falling rapidly and/or unexpectedly.
• NEVER use emergency release handle unless garage
doorway is clear of persons and obstructions.
WARNING
CAUTION WARNING
WARNING
INSTALLATION STEP 2
Attach the Emergency Release Rope
and Handle
• Thread one end of the rope through the hole in the top
of the red handle so “NOTICE” reads right side up as
shown. Secure with an overhand knot at least 1"
(2.5 cm) from the end of the rope to prevent slipping.
• Thread the other end of the rope through the loop in
the emergency release cable.
• Adjust rope length so the handle is no higher than 6'
(1.83 m) above the floor. Secure with an
overhand knot.
NOTE: If it is necessary to cut the rope, heat seal the cut
end with a match or lighter to prevent unraveling.
Figure 2

9
WHT/GRN
To release wire, push in
tabwith screwdriver tip
Cable Tension
Monitor
7/16" (11mm)
Strip wire 7/16" (11mm)
WHT/GRN
Cable
Tension
Monitor
Cable Tension
Monitor Roller
Cable
2"-6"
(5 cm-
15 cm)
Drum
Torsion Bar
Opener
1/8"-1/4"
(3 mm-6 mm)
With Door Closed
Preferred Orientation
Figure 1
#8Hex Head Screw(2)
Screw#6 (2) Wall Anchor (2)
Staples
HARDWARE SHOWN ACTUAL SIZE
Figure 3
INSTALLATION STEP 4
Attach the Cable Tension Monitor
(Required)
This opener comes standard with the cable tension
monitor. It is supplied as a device to monitor the
cables for ANY slack that may occur and will reverse
the door when excessive slack is detected,
eliminating service calls.
The cable tension monitor must be connected and
properly installed before the garage door opener will
move in the down direction.
NOTE: The cable tension monitor is shipped for left
side installation.
NOTE: It is preferred that the cable tension monitor be
installed on the same side of the door as the opener. If
required, it can be mounted on the opposite side of door.
Remove the snap-ring holding the roller in place and
reassemble it on the opposite side of the cable
tension monitor.
1. Position the cable tension monitor as shown
(Figures 1 and 2). The cable tension monitor should be
located as close to the drum as possible.
NOTE: There must be no obstructions in the installation
area that prevent the cable tension monitor or the cable
itself from closing completely when slack is detected.
2. Make sure cable tension monitor is located over a
wood support member.
NOTE: If the cable tension monitor can not be mounted
into wood with the lag screws provided, it can be
mounted into 1/2" or greater drywall using the wall
anchors (2) and the #8 hex head screws (2) provided in
the hardware bag.
3. Mark and drill 3/16" pilot holes for screws (pilot holes
are not required for anchors).
4. Attach the cable tension monitor to the wall using the
hardware provided. Make sure that the roller is on top
of the cable.
5. Run bell wire to motor unit. Use insulated staples to
secure wire in several places.
6. Connect bell wire to the green quick-connect terminals
(polarity is not important) (Figure 3).
NOTE: Cable must have tension through entire travel.
Make sure there is no slack in cable on opposite side of
garage door during normal operation. If this condition
exists, adjust cables as required.
3/4" Min.
(18mm Min.)
Wall
Drum
Cable
Figure 2

10
INSTALLATION STEP 5
Install the Control Console
Locate control console within sight of the door at a
minimum height of 5 feet (1.5 m) where small children
cannot reach, and away from moving parts of the door
and door hardware. The installation surface must be
smooth and flat. If installing into drywall (Figure 1), drill
5/32" holes and use anchors provided. For pre-wired
installations (as in new home construction), it may be
mounted to a single gang box (Figure 2). NOTE: After
installation and the power head is plugged in, a green or
amber indicator light behind the cover will indicate proper
connection. If not lit, the Lock and Light features will not
function (reverse wires to correct).
1. Strip 7/16" (11 mm) of insulation from one end of bell
wire and connect to terminals on back of control
console by color: white wire to WHT and white/red wire
to the RED (Figure 3).
2. Remove cover by gently prying at slot in top of the
cover with a small flat head screwdriver. Fasten with
6ABx1-1/4" self-tapping screws (drywall installation) or
6-32x1" machine screws (into gang box) as follows:
• Drill and install bottom screw, allowing 1/8" (3 mm)
to protrude above wall surface.
• Position bottom of control console on screw head and
slide down to secure. Adjust screw for snug fit.
• Install top screw with care to avoid cracking plastic
housing. Do not over tighten.
• Insert top tabs and snap on cover.
NOTE: The push bar may stick if the control console is
not mounted on a smooth surface. If a click is not heard
when pressing the push bar, loosen the two mounting
screws or relocate the control console to a smoother
surface.
3. (Standard installation only) Run bell wire up wall and
along ceiling to motor unit. Use insulated staples to
secure wire in several places. Do not pierce wire with
a staple, creating a short or open circuit.
4. Strip 7/16" (11 mm) of insulation from end of bell wire.
Connect bell wire to the quick-connect terminals as
follows: white to white and white/red to red (Figure 4).
5. Use tacks or staples to permanently attach entrapment
warning label to wall near control console, and manual
release/safety reverse test label in a prominent
location on inside of garage door.
NOTE: DO NOT connect the power and operate the
opener at this time. The door will travel to the full open
position but will not return to the close position until the
sensor beams are connected and properly aligned. See
Protector System Instructions beginning on page 14.
WHT/RED
WHT
Control Console
Connections
To release wire, push in
tabwith screwdriver tip
7/16" (11 mm)
Strip wire 7/16" (11 mm)
To prevent possible SERIOUS INJURY or DEATH from
electrocution:
• Be sure power is not connected BEFORE installing
control console.
• Connect ONLY to 24 VOLT low voltage wires.
To prevent possible SERIOUS INJURY or DEATH from a closing
garage door:
• Install control console 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 parts of door.
• NEVER permit children to operate or play with control console
push buttons or remote controls.
• Activate door ONLY when it can 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.
Figure 4
WARNING
CAUTION
WARNING
WARNING
Drywall Anchors
Insulated
Staples
Screw 6ABx1-1/4"
(standard installation)
Screw 6-32x1"
(pre-wired)
HARDWARE SHOWN ACTUAL SIZE
LOCKLIGHT
To Replace
Insert Top
Tabs First
STANDARD WALL MOUNT
Detector
Switch
Push Bar Cover
ON
OFF
Figure 1
Bell Wire
PRE-WIRED INSTALLATION
LOCKLIGHT
To Replace
Insert Top
Tabs First
Detector
Switch
Push Bar
Cover
ON
OFF
1
RED
2
WHITE
Control
Console
Terminal
Screws
Bell Wire
(BACK VIEW)
Bottom
Mounting
Hole
Top
Mounting
Hole
Figure 3
Figure 2