Chamberlain Merlin MJ3800 User manual

MJ3800
Residential & Light Duty Commercial Door Opener
Installation and Operating Instructions
Optional
Accessory
Available
See Page 10 for the New
www.chamberlainanz.com
Owners Copy: Please keep these instructions for future reference
This manual contains IMPORTANT SAFETY information
DO NOT PROCEED WITH THE INSTALLATION BEFORE READING THOROUGHLY

2
CONTENTS PAGE
SAFETY INSTRUCTIONS . . . . .2
CARTON INVENTORY . . . . . . .3
ACCESSORIES . . . . . . . . . . . 3
SPECIFICATION . . . . . . . . . . .4
TOOLS REQUIRED . . . . . . . . .4
PREPARE & TEST T E DOOR . .4
DOOR REQUIREMENTS . . . . . .5
ASSEMBLY...............6
INSTALLATION . . . . . . . . .7-10
CONNECT ELECTRIC POWER .10
INSTALL T E PROTECTOR
SYSTEM . . . . . . . . . . . . .11-12
MULTI-FUNCTION DOOR
CONTROL ..............13
AUTO CLOSE . . . . . . . . . . . .13
ADJUSTMENT . . . . . . . . .14-17
WIRELESS PROGRAMMING18-19
REPAIR PARTS . . . . . . . . . . .20
DIAGNOSTIC C ART . . . . . . .21
TROUBLES OOTING . . . . . . .22
CARE OF YOUR OPENER . . . . 23
OPERATION OF YOUR OPENER23
WARRANTY .............24
The opener must not be used on a wicket
door (door within a door).
The Protector SystemTM must be used for all
installations where the closing force as measured
on the bottom of the door is over 400N (40kgf).
Excessive force will interfere with the proper
operation of the safety reverse system or
damage the garage door.
After installation, ensure that the parts of the door
do not extend over public footpaths or roads.
Install the wireless wall button (or any
additional wall control) in a location where the
garage door is visible, at a height of at least 1.5m
and out of the reach of children. Do not allow
children to operate push button(s) or
transmitter(s). Serious personal injury from a
closing garage door may result from misuse of
the opener.
Permanently fasten the Warning Labels in
prominent places, adjacent to wall controls and
manual release mechanisms as a reminder of
safe operating procedures.
Activate opener only when the door is in full view,
free of obstructions and the opener is properly
adjusted. No one should enter or leave the garage
while the door is in motion.
Do not allow children to play near the door, or
multi function door controls.
Disconnect electric power to the garage door
opener before making repairs or removing
covers.
KEEP THESE INST UCTIONS
WARNING
• Failure to comply with the following instructions may result in serious personal injury or property damage.
• Read and follow all instructions carefully.
• The garage door opener is designed and tested to offer safe service provided it is installed and
operated in strict accordance with the instructions in this manual.
These safety alert symbols mean WA NING : A possible risk to personal safety or
property damage exists.
NOTE: If your garage has no service entrance door, a CM1702 outside quick release must be installed.
This accessory allows manual operation of the garage door from outside in case of power failure.
Keep garage door balanced.Do not let the garage
door opener compensate for a binding or sticking
garage door. Sticking, binding or unbalanced doors
must be repaired before installing this opener.
Do not wear rings, watches or loose clothing while
installing or servicing a garage door opener.
Frequently examine the door installation, in
particular cable, springs and mountings for signs
of wear, damage or imbalance. Do not use if repair
or adjustment is needed since springs and
hardware are under extreme tension and a fault
can cause serious personal injury.
To avoid serious personal injury from
entanglement, remove all ropes, chains and locks
connected to the garage door before installing the
door opener.
Installation and wiring must be in compliance with
your local building and electrical codes.
The safety reverse system test is very important. Your
garage door MUST reverse on contact with a
40mm obstacle placed on the floor. Failure to
properly adjust the opener may result in serious
personal injury from a closing garage door. epeat
the test once a month and make any necessary
adjustments.
This appliance is not intended for use by persons
(including children) with reduced physical, sensory
or mental capablities, or lack of experience and
knowledge, unless they have been given
supervision or instruction concerning use of the
appliance by a person responsible for their safety.
This opener should not be installed in a damp or wet
space exposed to weather.
STA T BY EADING THESE IMPO TANT SAFETY INST UCTIONS

3
Manual
TM
CM128 Wireless
Wall Button
2 x C945 3ch
rolling code
transmitters
Opener
LOCK
LIGHT
Multi function
door control
Hardware Inventory
INSTALLATION HARDWARE
Hex Screw #14-10x1-7/8" (4)
Screw #6x-1" (2)
Hex Screw #6x1-1/4” (2)
Carriage Bolt 1/4"-20x1/2" (2)
Pan Head Screw 1/4"-20x1/2" (2)
Hex Head Screw #8x1" (2)
Self Tapping Screw #10-32 (2)
Wall Anchor (2)
Wall Anchor (Screw-In) (2)
Handle
Rope
Insulated Staples (10)
Lock Template
PROTECTOR S STEMTM (IR)
INSTALLATION HARDWARE
Screw 10-32x3/8" (4)
Carriage Bolt 1/4"-20x1/2" (4)
Wing Nut 1/4"-20 (2)
Hex Nut 10-32x3/8" (4)
Hex Nut 1/4-20 (4)
Hex Head Screw 1/4-20x1-1/2" (2)
Hex Head Screw 14-10 x 1-1/2" (4)
Insulated Staple (10)
CARTON INVENTORY
Your door opener is packaged in one carton which contains the opener and the parts illustrated below.
Note that accessories will depend on the model purchased. If anything is missing, carefully check the
packing material.
5
3
1
10
11
24
C840
CM128
760E
CM1702
C77
C940 C943 C945
789
CM844
12
ENROLL
FAIL
RETRY
SEND
PASS
READY
ENROLL
C379
LOCK
LIGHT
6
LOCK LIGHT
C98
845AML
(1) Model CM844 4 Channel remote control
(2) Model CM128 Wireless Wall Button
(3) Model C940 1 Channel visor remote control
(4) Model C943 3 Channel visor remote control
(5) Model C945 3 Channel mini remote control
(6) Model 845AML Multi-Function Door Controll
or Model C98 Motion Detecting Control Panel
(7) Model C840 Keyless Entry ystem
(8) Model C77 The Protector ystemTM
(9) Model CM1702 Quick Release Lock
(10) Model 760E Outside Keyswitch
(11) Model C379 Wireless Fingerprint Access ystem
(12) Model ANT4X-1 433MHz Antenna, cable and adaptor
(
ACCESSORIES

4
PREPARING YOUR DOOR
Before you begin:
• Disable locks.
• Remove any ropes connected to door.
•Complete the following test to make sure your
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,STIC S 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 door and opener:
• ALWAYS disable locks BEFORE installing and
operating the opener.
To prevent possible SERIOUS INJURY or DEAT :
• ALWAYS call a trained door systems technician if
door binds, sticks or is out of balance. An
unbalanced door may not reverse when required.
• NEVER try to loosen, move or adjust 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 the door BEFORE installing and operating the
door opener to avoid entanglement.
• This device is not intended for use by small children
or infirmed persons without supervision.
• young children should NOT be permitted to play
with the opener or transmitters.
Tools needed
During assembly, installation and adjustment of
the opener, instructions will call for hand tools as
illustrated below.
Pliers Wire Cutters
Claw Hammer
Screwdriver
Adjustable End Wrench
1/4", 5/16" & 3/8" Sockets
and Wrench with 200mm 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
Torque Meter (not shown)
Specifications
Volts: 230-240 ~ V 50 z
Current: 145 Watts
Rated Load: 10Nm
Fmax: 40Nm
Max door height: 4.2m (14’)
Max door width: 5.5m
Max: area 16m2
Please note hardware accessories are supplied directly from Chamberlain USA,
therefore Tools and Drills are often stated in imperial measures.

Safety
Reversing Sensor
Safety
Reversing
Sensor
Torsion Spring
Opener
Wireless wall button
Access Door
Gap between floor
and bottom of door must not exceed 6 mm (1/4”)
Powered
Door Lock
Cable Tension
Monitor
Drum
5
DOOR REQUIREMENTS
Survey the 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 4.2m (14’) high.
• 100mm - 150mm drums (4” to 6”), NOT TO BE
USED on tapered drums over 150mm (6”).
• igh lift and standard lift sectional doors up to
4.2m (14’) high.
• Doors up to 5.5m (18’) wide.
• Doors up to 16m2(170 sq ft)
• 25mm (1”) 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 64mm (2 1/2”) between
the wall and the center of the torsion bar.
• Must have minimum of 76mm (3”) between the
ceiling and the center of torsion bar.
• Must have minimum of 203mm (8”) between the
side wall (or obstruction) and the end of torsion
bar.
• The torsion bar must extend at least 25mm to
100mm (1” to 4”) past the bearing plate.
• An electric outlet is required within 1.8m (6’) of
the installation area. If outlet does not exist,
contact a qualified electrician.
• Depending upon building’s construction,
extension brackets or wood blocks may be
needed to install safety reversing sensors.
• A model CM475 EverChargeTM Standby Power
Unit (SPU) is strongly recommended if there is
no access door to the building, 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 6mm (1/4”). 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.

ASSEMBL STEP 1
Attach the Collar to the Opener
To avoid installation difficulties, do not run the door
opener until instructed to do so.
• Loosen the collar screws.
• Attach collar to either the left or the right side of the
opener. 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 (Figure 2) to
secure collar to the opener (16Nm-19Nm of torque).
NOTE: For most installations the screws should be
facing up for easy access. Do not tighten set screws
until indicated.
6
Collar Screw
Collar Screw
Set Screw
Collar Screw
Collar Screw
Set Screw
ASSEMBLY STEP 2
Attach Mounting Bracket to Opener
• Loosely attach slotted side of mounting bracket
to the same side of the opener as the collar,
using self-threading screws provided.
NOTE: Do not tighten until instructed. 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 DEAT ,
the collar MUST be properly tightened. The door
may not reverse correctly or limits may be lost
due to collar slip.
Alternate Mounting it (NOT SUPPLIED):
This kit allows model MJ3800 to be
mounted below the torsion bar in the
case where the torsion bar is not
round or the normal mounting area
is obstructed.
G480LM
Left hand
installation
Right hand
installation

7
INSTALLATION
INSTALLATION STEP 1
Position the Opener
1.Close the door completely.
2.Slide the opener with collar over the end of the torsion
bar. Ensure that the collar does not touch the bearing
plate. Check to make sure the mounting bracket is
located on a solid surface such as wood, concrete or
door/flag bracket. Snug collar screws to help assure
proper alignment of opener. 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 5mm (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 16Nm-
19Nm of torque. Securely tighten both set screws firmly,
without damaging the opener.
5.Fasten bracket securely with 14-10x1-7/8" screws.
Tighten all mounting bracket hardware.
NOTE: The opener 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 the door,
springs, cables, pulleys, brackets or their hardware,
ALL of which are under EXTREME tension.
• ALWAYS call a trained door systems technician if the
door binds, sticks or is out of balance. An unbalanced
door might not reverse when required.
• Opener MUST be mounted at a right angle to the
torsion bar to avoid premature wear on the collar.
Staple
Torsion Bar
IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
WARNINGWARNING
1.READ AND FOLLOW ALL INSTALLATION
WARNINGS AND INSTRUCTIONS.
2.Install door opener ONLY on properly balanced and
lubricated the 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 the door BEFORE installing opener to avoid
entanglement.
5 Mount emergency release handle no higher than 1.8m
above floor.
6.NEVER connect the 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 the door or opener mechanisms.
8.Install wall-mounted door control:
• within sight of the door.
• out of reach of children at minimum height of
1.5 m.
• away from ALL moving parts of the door.
9.Place entrapment warning label on wall next to multi
function door control.
10.Place manual release/safety reverse test label in plain
view on inside of the door.
11.Upon completion of installation, test safety reversal
system. Door MUST reverse on contact with a 40mm
(1 1/2”) high obstacle placed on the floor.

Staples
Lock Screw
1/4-20 x 1/2" (2)
HARDWARE SHOWN ACTUAL SIZE
Lock Template
Roller
Garage
Door Track
TOP
DRILL 8mm
DRILL 19mm
DRILL 8mm
132A2505
TOP
DRILL5/16"
DRILL3/4"
DRILL5/16"
132A2505
Approx. 7.6cm
(3”)
Figure 1
INSTALLATION STEP 3
Install powered door lock
The lock is used to prevent the 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 opener. The
second roller up from the bottom is ideal in most
installations.
2.Ensure the door track 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 powered door lock to the outside of the
door track with hardware provided.
5.Run bell wire up wall to opener. Use insulated
staples to secure wire in several places.
6.Plug connector into the opener (Figure 2).
NOTE: Lock must be mounted within 3m (10') of the
power head.
Overhand
Knot
Emergency
Release Handle
Overhand
Knot
Rope
Opener
Emergency
Release Cable
016+%'
Warning Label
WARNING
To prevent possible SERIOUS INJURY or DEAT
from a falling door:
• If possible, use emergency release handle to
disengage door ONLY when 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
the doorway is clear of persons and
obstructions.
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 25mm (1") 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 1.8m (6’) above the floor. Secure with an
overhand knot.
NOTE: If it is necessary to cut the rope, heat seal the
cut end to prevent unraveling.
Figure 2
8

WHT/GRN
To insert or release wire,
push in tab with
screwdriver tip
Cable Tension
Monitor
Strip wire (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
#8 Hex Head Screw (2)
Screw #6 (2)
Wall Anchor (2)
Staples
Figure 3
INSTALLATION STEP 4
Attach the Cable Tension Monitor (Required)
Your MJ3800 is supplied with a cable tension monitor.
This safety device is supplied to monitor the cable 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 door opener will move in
the down direction.
NOTE: The cable tension monitor is shipped for left
side installation. 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. emove 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 25mm (1”) or greater pasterboard
using the wall anchors (2) and the #8 hex head screws
(2) provided in the hardware bag.
3.Mark and drill 5mm (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 opener. 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 the door during normal operation. If this condition
exists, adjust cables as required.
3/4" Min.
(18 mm Min.)
Wall
Drum
Cable
Figure 2
9

10
To prevent possible SERIOUS INJURY or DEATH from
electrocution or fire:
• Be sure power is not connected to the opener, and
disconnect power to circuit BEFORE removing cover.
• Door installation and wiring MUST be in compliance
with ALL local electrical and building codes.
• NEVER use an extension cord, 2-wire adapter or alter the
plug in any way to make it fit outlet. Be sure the opener is
grounded.
• If the supply cord is damaged, it must be replaced
by the manufacturer or it’s service agent or a
similiarly qualified person in order to avoid harzard.
+
INSTALLATION STEP 6
Installing the Wireless Wall button (CM128)
Control must be mounted out of the reach of children
at a height of 1.5m with an unobstructed view of the
door.
• Ensure your MJ3800 opener is switched off whilst
installing your wireless door control to prevent
accidental activation.
• Remove the cover from the CM128.
• Mount CM128 as shown using the screws
provided if mounting into a wall box (not
provided).
• If mounting directly on the wall use wall anchors
(provided) to fix unit to the plasterboard wall.
• Replace the cover plate and affix the warning label
adjacent the wall controller.
Fix the emergency door release label adjacent to the
opener.
INSTALLATION STEP 7
Mounting the Evercharge Standby Power
Unit (SPU)
(not provided)
If the optional CM475 Standby power supply unit is
part of this installation it should be installed at this
time.
• The SPU can be mounted to either the ceiling or
a wall within 3' (.9 m) of the opener.
• Position the SPU as desired to a structural
support (ceiling joist or wall stud).
• Attach the SPU to the support using the
mounting holes on either side of the SPU.
• Secure the SPU using the 1-1/2" lag screws (2)
provided with the SPU unit.
• Connect the SPU cord into the connector on the
bottom of the opener.
• Follow all instructions included with the CM475
unit to test for proper operation and testing of
the SPU.
SPU Cord
Connector
CM475 EverCharge
Standby Power Unit
TM
Disconnect power to the opener whilst installing
this accessory to prevent accidental activation.
Locate minimum 1.5m above the floor.
NOTE: The wireless wall button supplied with your opener should be preprogrammed by the
factory. If adding a new wireless wall button, program into the opener before mounting the unit.
CONNECT ELECTRIC POWER
TO AVOID INSTALLATION DIFFICULTIES, DO NOT RUN
THE GARAGE DOOR OPENER UNTIL INSTRUCTED TO
DO SO.
Connect to properly fused and earth power outlet.

11
Be sure power is not connected to the door opener
BEFORE installing the safety reversing sensor.
To prevent SERIOUS INJURY or DEAT from a closing
door:
• Correctly connect and align the safety reversing
sensor. This required safety device MUST NOT be
disabled.
• Install the safety reversing sensor so beam is NO
IG ER than 100mm (4”) above the floor.
Mounting Bracket
With Square Holes
#10-32x3/8"
Screws
"C" Wrap
#10-32
Lock Nuts
ALL Installations
figure 1
INSTALLING THE BRACKETS
Be sure power to the opener is disconnected.
Figures 1, 2 and 3 show recommended assembly of
bracket(s) and "C" wrap based on the wall installation of
the sensors on each side of the door shown above, or on
the door tracks themselves. Figure 4 shows variations
which may fit your installation requirements better. Make
sure the wraps and brackets are aligned so the
sensors will face each other across the door.
• Connect each assembly to a slotted bracket, using the
hardware shown. Note alignment of brackets for left
and right sides of the door. Finger tighten the lock
nuts.
•Use bracket mounting holes as a template to locate and
drill (2) (4.8mm) diameter pilot holes on both sides of the
door, (100mm). Max height is (100mm).
• Attach bracket assemblies with 1/4"x1-1/2" lag screws as
shown.
• Adjust right and left side bracket assemblies to the same
distance out from mounting surface. Make sure all door
hardware obstructions are cleared. Tighten the nuts
securely.
•Centre each sensor unit in a "C" wrap with lenses
pointing toward each other across the door.
• Secure sensors with the hardware shown in Figure 6.
Finger tighten the wing nut on the receiving eye to allow
for final adjustment. Securely tighten the sending eye wing
nut.
•Run wires from both sensors to the opener as shown in
Figure 5. Use insulated staples to secure the wire to the
wall and ceiling.
• Connect both sets of wires to the opener terminals as
shown page 12.
•Plug in the opener. If your opener has the Multi-Function
Door Control, make sure the Lock Feature is off.Red
indicator lights in both the sending and receiving eyes will
glow if wiring connections and alignment are correct.
If the indicator lights are flashing (and the invisible light
beam path is not obstructed), alignment is required.
• Loosen the receiving eye wing nut to allow slight rotation
of unit.Adjust sensor vertically and/or horizontally until the
red indicator light glows.
• When indicator lights are glowing in both units, tighten the
wing nut in the receiving eye unit.
Mounting Bracket
with Slot
1/4"-20
Lock Nuts
1/4x1-1/2"
Lag Screws 1/4-20x1/2" Carriage Bolts
(with square shoulder)
Inside
Garage
Wall
"C" Wrap
Mounting Bracket
with Square Holes
"C" Wrap
Inside
Garage
Wall Mounting
Bracket with
Square Holes
Garage
Floor
Mounting
Bracket
with Slot
Alternate Wall
Mount
Sensor
Inside
Garage
Wall
Alternate Floor
Mount
Mounting Bracket
with Slot
Mounting Bracket
with Square Holes
"C"
Wrap
Sensor
Garage
Floor
Indicator Light
Indicator Light
Attach with
concrete anchors
(not provided)
Inside
Garage
Wall
"C" Shaped
Wrap
Mounting Bracket
with Square Holes
1/4-20x1/2"
Carriage Bolts
1/4"-20
Lock Nuts
Drill 3/8"
(9,5mm) Holes
Garage
Door Track
Garage DOOR Track Installation
Garage WALL Installation
1/4-20x1-1/2"
Hex Bolt
"C" Wrap Wire
Sensor
Wing Nut
Indicator
Light
figure 2
figure 3
figure 4
figure 5
figure 6
INSTALLATION STEP 8
Install The Protector SystemTM
When installed thesafety reversing sensor must be
connected and aligned correctly before the door
opener will move in the down direction. This safety
device is provided for your safety and should not be
disabled.

12
Invisible Light Beam
Protection Area
S
ensor
Sensor
Safety Reversing Sensor
Bell Wire
Bell Wire
Opener
Safety Reversing Sensor
Power Door Lock
Quick-Connect Terminals
WHT/BLK
WHT
Sensor
Connections
To Power
Door Lock
To Cable Tension Monitor
To Door Control
dry contact
Connect Wire to
Quick-Connect
Terminals
com
no
MAX height
100mm (4”)
MIN height
50mm (2”)
MOUNTING AND WIRING THE SAFETY
REVERSING SENSORS
• Run the wires from both safety reversing sensors to the
opener. Use insulated staples to secure wire to wall and
ceiling.
• Strip 11mm (7/16") of insulation from each set of wires.
Separate white and white/black wires sufficiently to
connect to the opener quick-connect terminals: white to
white and white/black to grey (Figure 6 page 11).
TROUBLESHOOTING THE SAFETY
REVERSING SENSORS
1.If the sending eye indicator LEDs are both flashing
after installation, check for:
• Electric power to the opener.
• A short in the white or white/black wires. These can
occur at staples, or at opener connections.
• Incorrect wiring between safety reversing sensors and
opener.
• A broken wire.
2.If the sending eye indicator light glows steadily but the
receiving eye indicator light doesn't:
• Check alignment.
• Check for an open wire to the receiving eye.
3.If the receiving eye indicator light is dim, realign
either sensor.
NOTE: When the invisible beam path is obstructed or
misaligned while the door is closing, the door will
reverse. If the door is already open, it will not close
and the LED indicator light will flash 10 times. See
page 21.

13
USING THE MULTI-FUNCTION DOOR
CONTROL
THE MULTI-FUNCTION DOOR CONTROL
Press the push bar to
open or close the
door. Press again to
reverse the door
during the closing
cycle or to stop the
door while it's
opening.
L ght feature
The Light function is not available with the MJ3800.
Lock feature
Designed to prevent operation of the door from
hand-held transmitters whilst still allowing the door to
open and close from the Door Control, the Outdoor ey
Switch and the eyless Entry Accessories. To activate,
press and hold the Lock button for 2 seconds.
To turn off, press and hold the Lock button again for
2 seconds. The Lock feature will also turn off whenever
the “learn” button on the opener panel is activated.
Note: This feature does not operate the Powered door
lock.
LOCK
LIGHT
Actuator
Button
LED Indicator
light
LIGHT
LOCK
AUTOMATIC CLOSE TIMER FUNCTION
Note: Requires the Chamberlain Protector SystemTM (IR-
sensors) to be installed. If Protector SystemTM (IR-
sensors) is installed only to enable the timer to close
function (first time), install sensors, close the garage door
and wait for 5 minutes.
A Multi-function Door Control is required to enable and
disable the auto-close function.
Enable: Push and hold lock button on the Multi-function
Door Control until the electric lock toggled twice. Release
the lock button, at the same time watch the LED light in
the center of the actuator button from the Multi-function
Door Control.
1x flash 10 seconds Auto-Close
2x flash 45 seconds Auto-Close
3x flash 2 minutes Auto-Close
4x flash 3 minutes Auto-Close
5x flash OFF Auto-Close
Factory setting is OFF. Repeat the procedure until the
Multi-function Door Control shows the required number of
flashes.
Auto close is NOT recommended for households with
young children.
Door may operate unexpectedly, therefore do not
allow anything to stay in the path of the door.

14
To prevent damage to vehicles, be sure fully
open door provides adequate clearance.
BLACK
ORANGE
Push and hold
until the door
is at desired UP
position then
release
Figure 2
Press to stop
door at desired
DOWN position
BLACK
ORANGE
Figure 4
Without a properly installed safety reversal
system, persons (particularly children) could be
SERIOUSLY INJURED or KILLED by a closing
door.
•NEVER learn forces or limits when door is
binding or sticking. Repair door first.
•Incorrect adjustment of the door travel limits
will interfere with proper operation of safety
reversal system.
•After ANY adjustments are made, the safety
reversal system MUST be tested. Door MUST
reverse on contact with 40mm high (1 1/2”)
object on floor.
ADJUSTMENT STEP 1
Program the Travel Limits
Travel limits regulate the points at which the door will
stop when moving up or down. Follow the steps below
to set the limits.
To program the travel limits:
Adjust the position of the door by using the black
and orange buttons. Black moves the door UP
(open) and orange moves the door DOWN (close).
1. Setting the UP position: Press and hold the black
button until the yellow indicator light starts
flashing slowly then release.
2. Push and hold the black button until the door
reaches the desired UP (open) position (Figure
2).
NOTE: Check to be sure the door opens high enough
for your vehicle to pass under.
3. Push the transmitter, wireless wall button or
multi-function door control (Figure 3). This sets
the UP (open) limit and begins closing the door.
NOTE: Excessive movement of the opener will cause
premature wear. See Troubleshooting section.
4. Immediately when the door begins to move
down, press and release either the black or
orange button. This will stop the door.
5. Setting the DOWN position: Push and hold the
orange button until the door reaches the desired
DOWN (closed) position (Figure 4).
6. Once the door is closed, check for proper
pressure on the door (you should be able to
manually push the door down 2mm). If there
appears to be too much pressure on the door,
you may toggle the door back and forth using
the black and orange buttons to reach the
desired position.
7. Push the transmitter, wireless wall button or the
multi-function door control (Figure 3). This sets
the DOWN (close) limit and should bring the
door to the open position.
• If the opener is not stopping exactly where you
would like it, repeat steps 1 through 7 and
program the limits again.
• When the unit stops in both the desired up
(open) and down (close) positions, proceed to
Adjustment Step 2, Settin the Force.
Orange
Button
(down)
Indicator
Light Black
Button
(up)
Figure 1
or
Figure 2
Figure 3
Figure 4

15
ADJUSTMENT STEP 2
Setting the Force
The force setting button is located on the front panel.
The force setting measures the amount of force
required to open and close the door.
1. Locate the orange button on the unit (Figure 1).
2. Push the orange button twice to enter unit into
Force Adjustment Mode (Figure 2). The LED
(Indicator Light) will flash quickly.
3. Push the transmitter, wireless wall button or
multi-function door control (Figure 3). The door
will travel to the DOWN (close) position. Push
the transmitter, wireless wall button or multi-
function door control again, the door will travel
to the UP (open) position. Push the transmitter,
wireless wall button or multi-function door
control a third time to send the door to the
DOWN (close) position.
The LED (Indicator Light) will stop flashing when
the force has been learnt.
The unit has learnt the forces required to open and
close your door.
The door must travel through a complete cycle, UP
and DOWN, in order for the force to be set
properly. If the unit cannot open and close your
door fully, inspect your door to ensure that it is
balanced properly and is not sticking or binding.
See pa e 4, “Preparin your door.”
Orange
Button
Indicator
Light Black
Button
BLACK
ORANGE
Push Orange button
twice to enter
unit into Force
Adjustment Mode
Figure 3
Figure 2
Figure 1
or
Without a properly installed safety reversal
system, persons (particularly children) could be
SERIOUSLY INJURED or KILLED by a closing the
door.
•NEVER learn forces or limits when door is
binding or sticking. Repair door first
•Too much force on door will interfere with
proper operation of safety reversal system.
•After ANY adjustments are made, the safety
reversal system MUST be tested. Door MUST
reverse on contact with 40mm (1 1/2”) high
obstacle on floor.
ADJUSTMENT STEP 3
Test Cable Tension Monitor
If your cable tension monitor has been activated
the unit will not open (the LED will flash 9 times).
See (Figure 1) page 9.
ADJUSTMENT STEP 4
Test Powered Door Lock
TEST
• With the door fully closed, the powered door lock
bolt should be protruding through the track.
• Operate the door in the open direction. The
powered door lock should retract before the door
begins to move.
• Operate the door in the down direction. When
the door reaches the fully closed position, the
powered door lock should automatically activate
to secure the door.
NOTE: If the powered door lock does not function, the
lock can be manually released by sliding the manual
release handle to the open position.

16
40mm (1 1/2”) obstacle
Without a properly installed safety reversal
system, persons (particularly children) could be
SERIOUSLY INJURED or KILLED by a closing the
door.
• Safety reversal system MUST be tested every
month.
• If one control (force or travel limits) is
adjusted, the other control may also need
adjustment.
• After ANY adjustments are made, the safety
reversal system MUST be tested. Door MUST
reverse on contact with 40mm (1 1/2”) high
obstacle on the floor.
Without a properly installed safety reversing
sensor, persons (particularly children) could be
SERIOUSLY INJURED or KILLED by a closing
door.
ADJUSTMENT STEP 5
Test the Safety Reversal System
TEST
• With the door fully open, place a 40mm (1 1/2”)
obstacle on the floor, centered under the the door.
• Operate the door in the down direction. The door must
reverse on contact with the obstruction. Upon
successful safety reversal test proceed to “Adjustment
Step 6 ”.
ADJUST
• If the door stops on the obstruction, it is not traveling
far enough in the down direction. Complete
Adjustment Steps 1 and 2 Programming the Limits
and Forces.
• Repeat the test.
• When the door reverses on the 40mm (1 1/2”)
obstacle, remove the obstruction and run the opener
through 3 or 4 complete travel cycles to test
adjustment.
• If the unit continues to fail the Safety Reverse Test,
call for a trained door systems technician.
IMPORTANT SAFETY CHEC :
Test the Safety Reverse System after:
• Each adjustment of limits, or force controls.
• Any repair to or adjustment of the door (including
springs and hardware).
• Any repair to or buckling of the floor.
• Any repair to or adjustment of the opener.
ADJUSTMENT STEP 6
Test The Protector System®
• Press the transmitter push button to open the door.
• Place the opener carton in the path of the door.
• Press the transmitter push button to close the door.
The door will not move and the LED indicator light will
flash twice.
The door opener will not close from a transmitter if the
indicator light in either sensor is flashing or off (alerting
you to the fact that the sensor is misaligned or
obstructed).
If the opener closes the door when the safety
reversing sensor is obstructed, do not operate the
door. Call for a trained door systems technician.
Safety Reversing Sensor Safety Reversing Sensor

17
OPERATION
IMPORTANT SAFETY INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
WARNINGWARNING
1. READ AND FOLLOW ALL WARNINGS AND
INSTRUCTIONS.
2. ALWAYS keep transmitters out of reach of children.
NEVER permit children to operate or play with the
wireless wall button, multi-fucntion door control or
transmitters.
3. ONLY activate the door when it can be seen clearly,
it is properly adjusted and there are no obstructions
to door travel.
4. ALWAYS keep the door in sight until completely
closed. NO ONE S OULD CROSS T E PAT OF T E
MOVING DOOR.
5. NO ONE S OULD GO UNDER A STOPPED,
PARTIALLY OPENED DOOR.
6. If possible, use emergency release handle to
disengage door ONLY when the door is CLOSED.
Weak or broken springs or unbalanced door could
result in an open door falling rapidly and/or
unexpectedly.
7. NEVER use emergency release handle unless the
doorway is clear of persons and obstructions.
8. After ANY adjustments are made, the safety
reversal system MUST be tested.
9. Safety reversal system MUST be tested every
month. The door MUST reverse on contact with
40mm (1 1/2”) high obstacle on the floor.
10. ALWAYS KEEP T E DOOR PROPERLY BALANCED
(see page 3). An improperly balanced door may
not reverse when required and could result in
SEVERE INJURY or DEAT .
11.ALL repairs to cables, spring assemblies and other
hardware, ALL of which are under EXTREME
tension, MUST be made by a trained door systems
technician.
12.ALWAYS disconnect electric power to the door
opener BEFORE making ANY repairs or removing
covers.
13. Permanently fix the Emergency release instruction
Label adjacent to the release handle.
14. SAVE THESE INSTRUCTIONS.
EMERGENCY DOOR RELEASE
ADJUSTMENT STEP 7
To Open the Door Manually
Disengage door lock before proceeding. The door should be fully
closed if possible. Pull down on the emergency release handle
until a click noise is heard from the unit and lift the door
manually. To reconnect the door to the opener, pull down the
emergency release handle straight down a second time until a
click noise is heard from the unit. The door will reconnect on the
next UP or DOWN operation.
Test the emergency release:
• Make sure the door is closed.
• Pull the emergency release handle. The door should then be
able to be opened manually.
• Return the door to the closed position.
• Pull the emergency handle a second time.
• Reconnect the door to the opener.
NOTICE
Emergency
Release Handle
WARNING
To prevent possible SERIOUS INJURY or DEAT from a falling door:
• If possible, use emergency release handle to disengage door ONLY when 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 the doorway is clear of persons and obstructions.
Powered Door Lock
Manual Releas
Lock Bolt
“Locked”

Your door opener has already been programmed at the factory to operate with your hand-held transmitter. The
door will open and close when you press the large centre button.
Below are instructions for programming your opener to operate with additional Security+transmitters.
1. Press and hold button you wish
to program to the opener.
2. The orange LED (indicator light)
will flash to indicate it is
receiving signal from the
transmitter.
3. Press the orange button until the
LED turns off (approx. 2 sec).
To Add or Reprogram a Hand-held Transmitter
USING THE “LEARN” BUTTON
WIRELESS PROGRAMMING
1
3
To Erase All Codes From
Opener Memory
To deactivate any unwanted
transmitter, first erase all codes:
Press and hold the orange “learn”
button on opener until the learn
indicator LED goes out
(approximately 6-9 seconds).
Note:All previous codes are now erased.
Reprogram each transmitter or keyless entry you
wish to use.
18
Wireless Programming a Fingerprint Entry
System C379 (optional) (not supplied)
Full instructions are available with this accessory.
Once you have enrolled your users into the C379 you can
program the unit into your opener.
Using the orange “LEARN” button:
1. Press and release the orange “learn” button (1) on
opener. The learn indicator light will glow steadily for 30
seconds.
2. Within 30 seconds slide the cover of the C379 up as
illustrated (A). wipe your finger on the reader head at a
steady speed (B) until the LED turns on (C).
3. When the LED indicator light turns off it has learnt the
code. Ensure there are no obstructions in the path of the
door, then press the send button (D) to test the door.
ENROLL
FAIL
RETRY
SEND
PASS
READY
ENROLL
A
ENROLL
FAIL
RETRY
SEND
PASS
READY
ENROLL
C
B
D
Press orange LEARN Button
LED will start flashing
Slide the cover plate
up (A)
Swipe finger at a
steady speed (B)
Yellow LED will indicate
successful swipe (C)
LED indicator light will
turn off
Test reader by pressing
the send button (D)
3-Button Transmitters
If provided with your garage door opener, the large button
is factory programmed to operate it. Additional buttons on
any 3-button transmitter or mini-transmitter can be
programmed to operate other Merlin Professional garage
door openers or gate openers.
C943
C945
Figure 1
1
2
3

1. Press and release the orange
“learn” button on opener. The
learn indicator LED will glow
steadily for 30 seconds.
2. Within 30 seconds, enter a four
digit personal identification
number (PIN) of your choice on
the keypad. Then press and hold
the ENTER button.
3. Release the button when the
opener LED turns off.
TO ADD, REPROGRAM OR CHANGE A EYLESS ENTRY PIN
USING THE “LEARN” BUTTON
3
To change an existing, known PIN
If the existing PIN is known.
1.Press the four buttons for the present PIN, then
press and hold the # button.
The LED on the opener will turn on.
2.Press the new 4-digit PIN you have chosen, then
press Enter.
The indicator LED will turn off. Code has been learnt.
Test by pressing the new PIN, then press Enter. The
door should move.
To set a temporary PIN
You may authorise access to visitors or service people
with a temporary 4-digit PIN. After a programmed
number of hours or number of accesses, this
temporary PIN expires and will no longer open the
door. It can be used to close the door even after it
has expired. To set a temporary PIN:
1.Press the four buttons for your personal entry PIN
(not the last temporary PIN), then press and hold
the * (star button).
2. Press the temporary 4-digit PIN you have chosen,
then press Enter.
3.To set the number of hours this temporary PIN will
work, press the number of hours (up to 255), then
press * (star button). OR
3.To set the number of times this temporary PIN will
open door, press the number of times (up to 255),
then press # (hash button).
The indicator light will turn off when the temporary
PIN has been learnt.
Test by pressing the four buttons for the temporary
PIN, then press Enter. The door should move. If the
temporary PIN was set to a certain number of
openings, remember that the test has used up one
opening. To clear the temporary password, repeat
steps 1-3, setting the number of hours or times to 0
in step 3.
One Button Close: Opener can be closed by pressing
only the ENTER button if the one button close feature
has been activated. This feature has been activated
at the factory. To activate or deactivate this feature
press and hold buttons 1 and 9 for 10 seconds. The
keypad will flash twice when the one button close is
active. The keypad will flash four times when one
button close is deactivated.
19
To prevent possible SERIOUS INJURY or DEAT :
• NEVER allow small children near batteries.
• If battery is swallowed, immediately notify
doctor.
To reduce risk of fire, explosion or chemical
burn:
• Replace ONLY CR2032 batteries.
• Do NOT recharge, disassemble, heat above
75°C or incinerate.
The Transmitter Battery
To replace battery, use a screwdriver blade to pry open
the case as shown. Insert battery positive side up.
Dispose of old battery properly.
or Carefully
Remove Battery

20
1
NOTICE
67
8
34
5
2
Installation Parts
REPAIR PARTS
EY PART
NO. NO. DESCRIPTION™
1 041A6102-1 Electric powered door lock
2 CM128 Wireless wall button
3 C77 Protector systemTM (IR Beams)
4 041A6388 Collar with set screws
5 C945 3ch rolling code transmitter
6 041A4582 Emergency release rope & handle
assembly
041B4494-1 2-Conductor bell wire - white &
white/red
7 041A6104-1 Cable tension monitor
8 041C0902 Mounting bracket
041C0169-2
041A6408
041A6348-9
041A6320-5
041A6095
041A6226-6
Opener Assembly Parts