PROFESSIONAL INSTALLATION BY:
2 Remote Controls
This opener is supplied with a three-button remote control (the second and third buttons can be used to control an
additional operator or gate if it contains a Linear MegaCode™ receiver). Additional single and multi-button remote
controls can be purchased. An unlimited number of remote controls can be used with this operator.The short white
MODELS LDO33 & LDO50
BELT-DRIVE OR CHAIN-DRIVE
GARAGE DOOR OPENERS
wire on the back of the operator serves as an antenna for
the remote controls. Do not cut off the white wire or the
remote controls will not operate well.
PREPARING TO ADD A REMOTE
2
LEARN LIGHT WILL
GLOW FOR 15 SECONDS
HOMEOWNER’S INSTRUCTIONS
WARNING
For Sectional and Jamb Type Doors
Children operating or playing with a garage
door opener can injure themselves or others.
The garage door could cause serious injury
or death. Do not allow children to operate the
remote control(s) or the wall station. A moving
garage door could injure or kill someone under
it. Activate the opener only when the door
is clearly visible, free of obstructions and
adjusted properly.
REMOTE MUST BE
ENTERED WHILE LEARN
LIGHT IS ON
IMPORTANT SAFETY NOTES
Please read the instructions carefully!This garage door opener is designed to provide safe and reliable service if installed
and tested as described in these instructions. A garage door is the largest mechanical appliance in a residence. Care
must be taken to prevent injury or death during installation and operation of the garage door and garage door opener.
THE FOLLOWING FORMATS ARE USED FOR SAFETY NOTES IN THESE INSTRUCTIONS.
1
PRESS THE LEARN BUTTON
ADDING A REMOTE
WARNING
CAUTION
To Add a Remote Control
1
This type of warning note is used to indicate This type of warning note is used to indicate
possible mechanical hazards that may cause the possibility of damage to the garage door or
1 Press the opener’s LEARN button. The red LEARN
light will glow. The red light will stay on for about 15
seconds. A remote must be added while the red
LEARN light is still on.
SEND A SIGNAL
FROM A REMOTE
serious injuries or death.
garage door opener.
2
THE OPENER'S LIGHT AND
LEARN LIGHT WILL FLASH
ONCE WHEN REMOTE HAS
BEEN ACCEPTED
2 Send a signal from a remote.The red LEARN light and
the opener’s light will flash once indicating that the
opener has accepted the remote.
IMPORTANT USER SAFETY INSTRUCTIONS
WARNING
ENTER A CODE
AND PRESS
START/STOP
PRESS A
BUTTON
- OR -
3 Repeat Steps 1 & 2 for any additional remote controls.
REMOVING ALL REMOTES
A MOVING GARAGE DOOR CAN CAUSE INJURY OR DEATH!
To Remove all Remote Controls
1 Press and hold the opener’s LEARN button for ten
seconds or more.
TO REDUCE THE RISK OF DEATH OR SEVERE INJURY:
1
2
READ AND FOLLOW ALL INSTRUCTIONS.
2 Release the LEARN button. The red LEARN light will
blink three times signaling that all of the remotes
in the opener’s memory were erased. The red
LEARN light will turn off, then turn on for 15 seconds.
A remote control can be entered during this time using
Step 2 above.
NEVER LET CHILDREN OPERATE, OR PLAY WITH DOOR CONTROLS! KEEP REMOTE CONTROL
AWAY FROM CHILDREN!
2
3
Always keep moving door in sight and away from people and objects until it is completely closed. NO
ONE SHOULD CROSS THE PATH OF THE MOVING DOOR.
THE LEARN LIGHT
WILL BLINK 3 TIMES
SIGNALING THAT
ALL REMOTES WERE
REMOVED
1
PRESS THE LEARN BUTTON
FOR 10 SECONDS OR MORE
4
5
NEVER GO UNDER A STOPPED, PARTIALLY OPEN DOOR.
Test door opener monthly. The garage door MUST reverse on contact with a 1-1/2 inch object (or
a 2x4 board laid flat at the center of the door) on the floor. If adjusting either the force or the limit
of travel, re-test the door opener. Failure to adjust the opener properly may cause severe injury or
death.
Testing
1 Before testing the remote control, straighten out the
opener’s white antenna wire so it points up.
REPLACING A REMOTE'S BATTERY
1
2
TWIST DIME IN
SLOT TO OPEN
CASE
LIFT OFF
THE TOP OF
THE CASE
2 Stand clear of the door, press the remote control’s
button and verify that the opener starts.
6
7
If possible, use the red emergency release handle only when the door is closed. Use caution when
using this release with the door open. Weak or broken springs may cause the door to fall rapidly,
causing injury or death.
3
Replacing a Remote Control’s Batteries
When the red light on the remote glows dimly, or fails to light at
all when the remote is activated, the batteries need replacing.
CAREFULLY
REMOVE THE
CIRCUIT BOARD
NOTE: THE CIRCUIT BOARD WILL FIT ONLY ONE
WAY INTO THE CASE. ALIGN THE PLASTIC POST
IN THE CASE WITH THE HOLE IN THE CIRCUIT BOARD
KEEP GARAGE DOORS PROPERLY BALANCED. (See Garage Door Opener Maintenance) An
improperly balanced door could cause severe injury or death. Have a qualified service person make
repairs to cables, spring assembly and other hardware.
5
1 Open the remote’s case and remove the circuit board.
2 Replace old batteries with two Type 2032 batteries.
3 Re-assemble the remote.
4
REMOVE OLD
INSERT TWO NEW
TYPE 2032 BATTERIES
PLUS SIDE UP THEN
REASSEMBLE UNIT
BATTERIES AND
DISPOSE OF THEM PROPERLY
8
SAVE THESE INSTRUCTIONS.
3 Garage Door Opener Maintenance
Weather conditions may affect the door operation
which could require some re-setting of the opener’s
adjustments. Doors may swell and become heavier
during wet periods, door hinges and rollers might bind
during cold periods. To insure safe operation of the door,
perform the following tests, including any additional test
steps described.
WARNING
1 Using the Garage Door Opener
OPENING OR CLOSING THE DOOR
Garage door hardware (springs, cables,
brackets, pulleys, etc.) are under extreme
pressure and tension. DO NOT ATTEMPT TO
LOOSEN, TIGHTEN OR ADJUST ANY DOOR
HARDWARE. CALL A QUALIFIED GARAGE DOOR
INSTALLATION PROFESSIONAL!
Opening the Door
WALL STATION
REMOTE CONTROL
1 With the door in view, press the wall station’s UP/
DOWN ARROW button, the button assigned to the
opener on the remote control, or enter a valid access
code and press START/STOP on a remote keypad.
REMOTE
KEYPAD
2 When the opener is activated, the opener’s light will
turn on and the door will begin to open.
ENTER AN
ACCESS CODE
- OR - AND PRESS
START/STOP
WARNING
Every Month
PRESS THE
WALL STATION'S
UP/DOWN ARROW
3 The door will open until the open limit is reached. If
an obstacle is encountered (opener’s light flashes four
times) while the door is opening, the door will stop.
PRESS A REMOTE
CONTROL BUTTON
1 With the door closed, pull the red release handle to
disconnect the opener from the door.
The garage door opener must not be installed
and used on an unbalanced door. The opener’s
internal door force sensor will not function
properly on an unbalanced door. Risk of
serious injury or death may result.
- OR -
2 From outside the garage, slowly open the door
manually all the way, and then close it all the way.
Notice if there is any binding, sticking or rubbing. The
door should move smoothly in both directions.
SAFETY LIGHTING
4 The opener’s light will stay on for about five minutes
after the door stops.
Closing the Door
TO DISCONNECT OPENER
TO RECONNECT OPENER
1 With the door in view, press the wall station’s UP/
DOWN ARROW button or the button assigned to the
opener on the remote control, or enter a valid access
code and press START/STOP on a remote keypad.
3 Raise the garage door about halfway up. Carefully
release the door and see if the door balances. It
should stay in place. Close the door.
➤NOTE: If the garage door is unbalanced or the
door travel isn’t smooth, have a qualified garage door
professional adjust or repair the door.
2 When the opener is activated, the opener’s light will
turn on and the door will begin to close.
PULL THE RED
WHENEVER OPERATING
THE LIGHT WILL TURN ON
FOR ABOUT 5 MINUTES
NOTE: A FLASHING
LIGHT INDICATES
TROUBLE
RELEASE HANDLE
TO DISCONNECT
THE OPENER FROM
FLIP THE LEVER UP
3 The door will close until the close limit is reached. If
an obstacle is encountered (opener’s light flashes four
times), or the safety beam is interrupted (opener’s light
flashes three times) during closing, the door will stop,
then re-open.
NOTICE
IF DOOR BECOMES OBSTRUCTED,
PULL DOWN ON HANDLE
AND RAISE OR
LOWER THE DOOR
TO RECONNECT
THE OPENER
4 To reconnect the opener, flip the release lever up.
Raise the door manually until the opener reconnects.
THE DOOR
NOTICE
IF DOOR BECOMES OBSTRUCTED,
PULL DOWN ON HANDLE
STOPPING THE DOOR
WALL
STATION
5 Perform the Safety Beam Test (Section 4).
6 Perform the Safety Reversal System Test as described
in Steps 4-6 in Section 6.
REMOTE
KEYPAD
CHECKING THE DOOR BALANCE
4 The opener’s light will stay on for about five minutes
after the door stops.
After Servicing the Opener
1 Perform the Safety Beam Test (Section 4).
THE DOOR SHOULD
BALANCE WITHOUT
GOING UP OR DOWN
REMOTE
CONTROL
Stopping the Door Mid-travel
2 Perform the Open and Close Limit Adjustments
(Section 5).
1 The door can be stopped immediately at any time
by pressing the wall station’s UP/DOWN ARROW
button, the remote control’s pushbutton, or press
the START/STOP button on a remote keypad.
THE DOOR CAN BE STOPPED
AT ANY POSITION USING THE
WALL STATION, REMOTE CONTROL,
OR A REMOTE KEYPAD
3 Perform the entire Door Force Safety System Test
(Section 6).
WARNING
2 The next time the opener is activated, the door will
move in the opposite direction.
Every 6 Months
Check the belt or chain tension.
PREVENTING REMOTES
FROM OPENING THE DOOR
Always perform the entire Door Force Safety
System Test (see Section 6) after making any
adjustments to the opener.
Vacation Lock for Additional Security
• For belt-drive rails, examine the length of the tension
spring in the traveler. It should be about 1” long.
1 Slide the wall station’s LOCK switch to the locked
position to prevent remote controls from opening the
door after the door is completely closed. The remotes
can close the door, but not open it. The door can
still be opened or closed by using the wall station’s
UP/DOWN ARROW pushbutton.
• For chain-drive rails, examine the spacing between
the turnbuckle and the rail. The turnbuckle should be
slightly above the rail.
TESTING THE SAFETY REVERSAL SYSTEM
TEST WITH SMALL OBSTACLE
LOCK
UNLOCK
THE DOOR MUST REVERSE
WITHIN 2-SECONDS AFTER
IMPACT WITH A 2 x 4 BOARD
➤NOTE: Too much or too little chain tension will cause
excessive sprocket noise.
SLIDE THE VACATION SWITCH
DOWN TO LOCK (REMOTES DISABLED)
OR UP TO UNLOCK (REMOTES NORMAL)
➤NOTE: To signal that the vacation switch is locked,
the opener’s light will flash five times if a remote is
activated in an attempt to open the door.
2 x 4 BOARD LAID FLAT
UNDER CENTER OF DOOR
Chain Adjustment
If necessary, use the following steps to adjust the chain.
CONTROLLING THE
OPENER'S LIGHT
TWIST
TURNBUCKLE
ADJUSTING A CHAIN-DRIVE
1 Hold the turnbuckle with a flat blade screwdriver and
loosen the two locknuts with a 7/16” end wrench.
2 Slide the wall station’s LOCK switch to the unlocked
position to return the opener to normal operation.
CHAIN
TIGHTEN
TURNBUCKLE
LOCKNUTS
2 Twist the turnbuckle to adjust the chain tension. Adjust
the chain until the turnbuckle is sightly above the rail.
CHAIN
LOOSEN
Controlling the Opener’s Light
LOCKNUTS
LOOSEN
1 The opener’s light can be lit by pushing the wall
station’s LIGHT button. The light will remain on until
the LIGHT button is pressed again or the opener is
cycled.
3 Hold the turnbuckle with a flat blade screwdriver and
tighten the two locknuts with a 7/16” end wrench.
Belt Adjustment
HOLD TURNBUCKLE
PRESS THE LIGHT
BUTTON TO TURN THE
LIGHT ON OR OFF
THE LIGHT WILL STAY ON UNTIL
THE LIGHT BUTTON IS PRESSED
OR THE OPENER IS CYCLED
The tension spring in the traveler keeps the belt taut. The
factory setting for the tension spring length is .9” long. If
the tension spring is longer than 1”, adjust the belt.
WITH FLAT BLADE
SCREWDRIVER TO
BACKUP LOCKNUTS
2 If the opener’s light is on, pushing the wall station’s
LIGHT button will turn the opener’s light off.
TO OPENER
LOCKNUTS
TIGHTEN
Disconnecting the Door from the Opener
MEASURE THE TENSION
SPRING LENGTH
ADJUSTING A BELT-DRIVE
IN CASE OF POWER FAILURE
OR IF DOOR BECOMES OBSTRUCTED
1 Hold the traveler so the adjustment wheel is visible
through the large slot.
1 With the door in any position (preferably closed),
carefully pull the red release handle. USE CAUTION
IF THE DOOR IS OPEN,THE DOOR MAY DROP.
ADJUSTMENT WHEEL
TRAVELER
2 Use a flat blade screwdriver to turn the adjustment
wheel to compress the tension spring until its length
is between .9” and 1” long.
2 The disconnected door can be opened or closed
manually.
PULL THE RED
RELEASE HANDLE
Every Year
3 To reconnect the opener, flip the release lever up.
Raise or lower the door manually until the opener
reconnects.
FLIP THE LEVER UP
LOOSEN
TIGHTEN
Check the door hardware for lubrication needs. Lubricate
door hinges, rollers and bearings according to door
manufacturer’s recommended procedures.
TO DISCONNECT
THE OPENER FROM
THE DOOR
NOTICE
IF DOOR BECOMES OBSTRUCTED,
PULL DOWN ON HANDLE
AND RAISE OR
LOWER THE DOOR
TO RECONNECT
THE OPENER
NOTICE
TURN THE ADJUSTMENT
WHEEL UNTIL THE TENSION
SPRING IS ABOUT 1" LONG
IF DOOR BECOMES OBSTRUCTED,
PULL DOWN ON HANDLE
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