Chamberlain 1255LMCR-2 User Manual

The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196

www.liftmaster.com

GARAGE DOOR OPENER

Model 1255LMCR-2 1/2HP

For Residential Use Only

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 panel of your opener.

Introduction 2-5

Safety symbol and signal word review........................2

Preparing your garage door ........................................3

Tools needed...............................................................3

Planning .....................................................................4

Carton inventory ..........................................................5

Hardware inventory .....................................................5

Assembly 6-7

Attach the rail to the motor unit...................................6

Attach the chain to the sprocket..................................6

Tighten the chain.........................................................7

Installation 7-22

Installation safety instructions .....................................7

Determine the header bracket location .......................8

Install the header bracket............................................9

Attach the rail to the header bracket.........................10

Position the opener ...................................................11

Hang the opener .......................................................12

Install the door control...............................................13

Install the light ...........................................................14

Attach the emergency release rope and handle .......14

Electrical requirements..............................................15

Install the Protector System

................................16-18

Fasten the door bracket.......................................19-20

Connect the door arm to the trolley .....................21-22

Adjustment 23-25

Adjust the travel limits ...............................................23

Adjust the force .........................................................24

Test the safety reversal system.................................25

Test the Protector System®........................................25

Operation 26-30

Operation safety instructions.....................................26

Using your garage door opener ................................26

Using the wall-mounted door control ........................27

To open the door manually........................................27

Care of your garage door opener..............................28

Having a problem? ....................................................29

Diagnostic chart.........................................................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

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.

INTRODUCTION

Safety Symbol and Signal Word Review

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

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.

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.

Tools needed

During assembly, installation and adjustment of the opener, instructions will call for hand tools as illustrated below.

WARNING

Sectional Door

One-Piece Door

WARNING

CAUTION

Carpenter's Level (Optional)

Drill

Tape Measure

3/16", 5/16" and 5/32" Drill Bits

Pencil

Hack Saw

Wire Cutters

Claw Hammer

Pliers

Stepladder

1/2" and 7/16" Sockets and Wrench

Screwdriver

Adjustable End Wrench

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 and the accompanying illustrations as you proceed with the installation of your opener.

SECTIONAL DOOR INSTALLATION

ONE-PIECE DOOR WITHOUT TRACK

ONE-PIECE DOOR WITH TRACK

Horizontal and vertical reinforcement is needed for lightweight garage doors (fiberglass, steel, aluminum, door with glass panels, etc.). See page 19 for details.

Header Wall

— — — — — — — —

Vertical Centerline of Garage Door

Gap between floor and bottom of door

Safety Reversing Sensor

must not exceed 1/4" (6 mm)

Slack in chain tension is normal when garage door is closed

Torsion Spring

Wallmounted Door Control

Safety Reversing Sensor

Extension Spring

Access Door

FINISHED CEILING

Support bracket & fastening hardware is required. See page 12.

Motor unit

Slack in chain tension

Safety Reversing Sensor

is normal

Header Wall

Gap between floor and bottom of door must not exceed 1/4" (6 mm)

garage door is closed.

when

Safety Reversing Sensor

FINISHED CEILI Support & fastening hard See page 12.

Wall-mounted Door Control

Access Door

bracket

ware is re

quired.

Motor Unit

Slack in chain tension is normal when garage door is closed.

Gap between floor

Safety Reversing Sensor

and bottom of door must not exceed 1/4" (6 mm).

Access Door

Safety Reversing Sensor

Your garage door opener is packaged in two cartons which contain the motor unit and all parts illustrated below. Accessories will depend on the model

purchased. If anything is missing, carefully check the packing material. Parts may be stuck in the foam. Hardware for installation is also listed below.

Carton Inventory

INSTALLATION HARDWARE

Hex Bolt 5/16"-18x7/8" (4) Lag Screw 5/16"-9x1-5/8" (2) Lag Screw 5/16"-18x1-7/8" (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) Self-Threading Screw 1/4"-14x5/8" (2)

Insulated Staples (30) Ring Fastener (3) Drywall Anchors (2) Rail Grease Carriage Bolt 1/4"-20x1/2" (2) Wing Nut 1/4"-20 (2) Rope Handle

(2)

Door Control Button

Motor Unit with Light lens

SECURITY✚

Single Button Remote Control (1)

2 Conductor Bell Wire White & White/Red

Door Bracket

Remote Control Visor Clip

Styrofoam

Chain

Sprocket Cover

Trolley

Chain Pulley Bracket

Safety Sensor Bracket (2)

One-Piece Rail

Header Bracket

(2) Safety Reversing Sensors (1 Sending Eye and 1 Receiving Eye) with 2-Conductor White & White/Black Bell Wire attached

Curved Door Arm Section

Safety Labels and Literature

Straight Door Arm Section

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.

• Position rail at a 45˚ angle to opener so one hole in rail and motor unit line up.

• Thread one of the washered bolts part way in.

Use only these bolts! Use of any other bolts will cause serious damage to door opener.

• Align rail and styrofoam over sprocket. Cut tape from rail, chain and styrofoam.

• REMOVE STYROFOAM.

ASSEMBLY STEP 2

Attach the Chain to the Sprocket and Install the Sprocket Cover

• Position chain over the sprocket. If necessary, loosen the outer nut on the trolley to obtain more chain slack.

• Insert the second washered bolt. CAUTION: Use

only the bolt previously removed from motor unit!

• Tighten both bolts securely through the rail into the motor unit as shown.

• Install the sprocket cover: Insert the back tab in the slot. Squeeze the cover slightly and insert the front tab in the slot on the mounting plate.

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

To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of the opener.

WARNING

CAUTION

Washered Bolt

USE ONLY THIS TYPE AND SIZE

BOLT

5/16"-18x1/2"

Styrofoam

Rail Hole

WARNING

Washered Bolt 5/16"-18x1/2"

USE ONLY THIS

TYPE AND SIZE

BOLT

Sprocket Cover

Back Tab Slot

Motor Unit Sprocket

Front Tab Slot

Mounting Plate

INSTALLATION

ASSEMBLY STEP 3

Tighten the Chain

• Spin the inner nut and lock washer down the trolley threaded shaft, away from the trolley.

• To tighten the chain, turn outer nut in the direction shown (Figure 1).

• When the chain is approximately 1/2" (13 mm) above the base of the rail at its midpoint, re-tighten the inner nut to secure the adjustment.

Sprocket noise can result if chain is too loose. When installation is complete, you may notice some

chain droop with the door closed. This is normal. If the chain returns to the position shown in Figure 2 when the door is open, do not re-adjust the chain.

NOTE: During future maintenance, ALWAYS pull the emergency release handle to disconnect trolley before adjusting chain.

NOTE: You may notice loosening of chain after Adjustment Step 3 (Test the Safety Reversal System). Check for proper tension and readjust chain if necessary. Then repeat Adjustment Step 3.

You have now finished assembling your garage door opener. Please read the following warnings before proceeding to the installation section.

IMPORTANT INSTALLATION INSTRUCTIONS

To reduce the risk of SEVERE INJURY or DEATH:

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. 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.

Figure 1

Figure 2

To Tighten Outer Nut

Trolley

Chain

Base of Rail

Outer Nut

Mid Length of Rail

Lock Washer

1/2" (13 mm)

Inner Nut

To Tighten Inner Nut

WARNING

INSTALLATION STEP 1

Determine the Header Bracket Location

Installation procedures vary according to garage door types. Follow the instructions which apply to your door.

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 (1.22 m) 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 9) 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 9.

3. Open your door to the highest point of travel as shown. Draw an intersecting horizontal line on the header wall above the high point:

• 2" (5 cm) above the high point for sectional door and one-piece door with track.

• 8" (20 cm) above the high point for one-piece door without track.

This height will provide travel clearance for the top edge of the door.

NOTE: If the total number of inches exceeds the height available in your garage, use the maximum height possible, or refer to page 9 for ceiling installation.

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

Header Wall

Vertical Centerline of Garage Door

Level (optional)

Header Wall

2" (5 cm)

Track

Highest Point of Travel

Door

Sectional door with curved track

Header Wall

8" (20 cm)

Door

Jamb Hardware

Highest Point of Travel

Unfinished Ceiling

OPTIONAL CEILING MOUNT FOR HEADER

2x4

Door

One-piece door with horizontal track

Door

BRACKET

2x4

Header Wall

8" (20 cm)

Structural Supports

Track

2" (5 cm)

Highest Point of Travel

Pivot

One-piece door without track: jamb hardware

One-piece door without track: pivot hardware

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.

HARDWARE SHOWN ACTUAL SIZE

CEILING MOUNT ONLY

Ceiling Mounting Holes

The nail hole is for positioning only. You must use lag screws to mount the header bracket.

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.

Wall Mounting Holes

CEILING MOUNT ONLY

The nail hole is for positioning only. You must use lag screws to mount the header bracket.

Lag Screw 5/16"-9x1-5/8"

Optional Wall Mounting Holes

Header Wall

2x4 Structural Support

Horizontal Line

Highest Point of Garage Door Travel

Header

Bracket

Vertical Centerline of Garage Door

Lag Screws 5/16"x9x1-5/8"

Door Spring

Garage Door

Vertical Centerline of Garage Door

INSTALLATION STEP 3

Attach the Rail to the Header Bracket

• Position the opener on the garage floor below the header bracket. Use packing material as a protective base. NOTE: If the door spring is in the

way you’ll need help. Have someone hold the opener securely on a temporary support to allow the rail to clear the spring.

• Position the rail bracket against the header bracket.

• Align the bracket holes and join with a clevis pin as shown.

• Insert a ring fastener to secure.

HARDWARE SHOWN ACTUAL SIZE

Header Wall

Header Bracket

Chain Pulley Bracket

Garage Door

Ring Fastener

Header Bracket

Clevis Pin 5/16"x2-3/4"

Chain Pulley Bracket

Rail

Temporary Support

Clevis Pin 5/16"x2-3/4"

Ring Fastener

ONE-PIECE DOOR WITHOUT TRACK

A 2x4 on its side is convenient for setting an ideal door-to-rail distance.

• Remove foam packaging.

• Raise the opener onto a stepladder. You will need help at this point if the ladder is not tall enough.

• Open the door all the way and place a 2x4 on its side on the top section of the door beneath the rail.

• The top of the door should be level with the top of the motor unit. Do not position the opener more than 4" (10 cm) above this point.

INSTALLATION STEP 4

Position the Opener

Follow instructions which apply to your door type as illustrated.

SECTIONAL DOOR OR ONE-PIECE DOOR WITH TRACK

A 2x4 laid flat is convenient for setting an ideal door-to-rail distance.

• Remove foam packaging.

• Raise the opener onto a stepladder. You will need help at this point if the ladder is not tall enough.

• Open the door all the way and place a 2x4 laid flat on the top section beneath the rail.

• If the top section or panel hits the trolley when you raise the door, pull down on the trolley release arm to disconnect inner and outer sections. Slide the outer trolley toward the motor unit. The trolley can remain disconnected until Installation Step 12 is completed.

To prevent damage to garage door, rest garage door opener rail on 2x4 placed on top section of door.

WARNING

CAUTION

Rail

Door

2x4 is used to determine the correct mounting height from ceiling.

Trolley Release Arm

ENGAGED

RELEASED

Header Bracket

Top of Door

2x4 is used to determine the correct mounting height from ceiling.

INSTALLATION STEP 5

Hang the Opener

Three representative installations are shown. Yours may be different. Hanging brackets should be angled (Figure 1) to provide rigid support. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to structural supports before installing the opener. This bracket and fastening hardware are not provided.

1. Measure the distance from each side of the motor unit to the structural support.

2. Cut both pieces of the hanging bracket to required lengths.

3. Drill 3/16" pilot holes in the structural supports.

4. Attach one end of each bracket to a support with 5/16"-18x1-7/8" lag screws.

5. Fasten the opener to the hanging brackets with 5/16"-18x7/8" hex bolts, lock washers and nuts.

6. Check to make sure the rail is centered over the door (or in line with the header bracket if the bracket is not centered above the door).

7. Remove the 2x4. Operate the door manually. If the door hits the rail, raise the header bracket.

8. Grease the top and underside of the rail surface where the trolley slides with rail grease.

NOTE: DO NOT connect power to opener at this time.

To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it SECURELY to structural supports of the garage. Concrete anchors MUST be used if installing any brackets into masonry.

HARDWARE SHOWN ACTUAL SIZE

Figure 1

Figure 2

WARNING

Figure 3

WARNING

Structural Supports

Lag Screws

Measure Distance

Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

Bracket (Not Provided)

Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

Hidden Support

Lag Screws 5/16"-18x1-7/8"

5/16"-18x1-7/8"

FINISHED CEILING

(Not Provided) Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

Lag Screw 5/16"-18x1-7/8"

Hex Bolt 5/16"-18x7/8"

Nut 5/16"-18

Lock Washer 5/16"

Lag Screws 5/16"-18x1-7/8"

Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

FINISHED CEILING

(Not Provided) Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18

To prevent possible SERIOUS INJURY or DEATH from electrocution:

• Be sure power is not connected BEFORE installing door control.

• Connect ONLY to 24 VOLT low voltage wires.

To prevent possible SERIOUS INJURY or DEATH from a closing garage door:

• Install door control within sight of garage door, out of reach of children at a minimum height of 5 feet (1.5m), and away from all moving parts of door.

• NEVER permit children to operate or play with door control push buttons or remote control transmitters.

• 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.

WARNING

INSTALLATION STEP 6

Install the Door Control

Locate the door control within sight of the door at a minimum height of 5 feet (1.5 m) where small children cannot reach, and away from all moving parts of the door and door hardware.

1. Strip 1/4" (6 mm) of insulation from one end of the bell wire. Connect it to the two screw terminals on the back of the door control by color: white wire to 2 and white/red wire to 1.

2. Fasten the Lighted Door Control Button securely with 6ABx1-1/2" screws. If installing into drywall, drill 5/32" holes and use the anchors provided.

3. Run the bell wire up the wall and across the ceiling to the opener. Use insulated staples to secure the wire in several places. Do not pierce wire with a staple, creating a short or open circuit.

4. Receiver terminal screws and the antenna are located on the back panel of the opener. Position the antenna wire as shown.

5. Connect the bell wire to the opener terminal screws: white to 2 and white/red to 1.

6. Use tacks or staples to permanently attach the entrapment warning label to the wall near the door control, and the manual release/safety reverse test in a prominent location on the inside of the garage door.

NOTE: DO NOT connect the power and operate the opener at this time. The trolley will travel to the full open position but will not return to the close position until the sensor beam is connected and properly aligned. See Safety Reversing Sensor instructions beginning on page 16.

HARDWARE SHOWN ACTUAL SIZE

WARNING

Screw 6ABx1-1/2" Lighted Door Control Button

Drywall Anchors

Insulated Staples

Bell Wire

WHT

-2

RED

-1

Lighted Door Control Button Terminal Screws

Lighted Door Control Button

Bell Wire

Back Panel

Opener Terminal Screws

2 3

Antenna

INSTALLATION STEP 7

Install the Light

INSTALL THE LIGHT

• Install a 75 watt maximum light bulb in the socket.

The light will turn ON and remain lit for approximately 4-1/2 minutes when power is connected. Then the light will turn OFF.

• Use standard neck Garage Door Opener bulbs for

replacement

INSTALL THE LENS

• Locate and loosen (approximately 1/8") the two

screws near top of opener front panel.

• Position lens against panel with slotted tabs

directly below screws. Slide lens up to seat tabs behind screws.

• Snap bottom tabs of lens into panel slots.

• Retighten top panel screws to secure lens..

INSTALLATION STEP 8

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 hole

in the release arm of the outer trolley.

• Adjust rope length so the handle is 6 feet (1.83 m)

above the floor. Ensure that the rope and handle clear the tops of all vehicles to avoid entanglement. 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.

To prevent possible OVERHEATING of the endpanel or light socket,

• DO NOT use short neck or specialty light bulbs.

• DO NOT use halogen bulbs. Use ONLY incandescent.

WARNING

To prevent possible SERIOUS INJURY or DEATH from a falling garage door:

• If possible, use emergency release handle to disengage trolley 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.

• NEVER use handle to pull door open or closed. If rope knot becomes untied, you could fall.

WARNING

CAUTION

Light Lens

75 Watt Max.

Light Bulb

Lens Tab

Panel Screw

Lens Slot

WARNING

Overhand Knot

Trolley

Rope

NOTICE

Trolley Release Arm

Emergency Release Handle

INSTALLATION STEP 9

Electrical Requirements

To avoid installation difficulties, do not run the opener at this time.

To reduce the risk of electric shock, your garage door opener has a grounding type plug with a third grounding pin. This plug will only fit into a grounding type outlet. If the plug doesn’t fit into the outlet you have, contact a qualified electrician to install the proper outlet.

If permanent wiring is required by your local code, refer to the following procedure.

To make a permanent connection through the 7/8" hole in the top of the motor unit:

• Remove the motor unit cover screws and set the cover aside.

• Remove the attached 3-prong cord.

• Connect the black (line) wire to the screw on the brass terminal; the white (neutral) wire to the screw on the silver terminal; and the ground wire to the green ground screw. The opener must be

grounded.

• Reinstall the cover.

To avoid installation difficulties, do not run the opener at this time.

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 to establish permanent wiring connection.

• Garage door installation and wiring MUST be in compliance with all local electrical and building codes.

• NEVER use an extension cord, 2-wire adapter, or change plug in ANY way to make it fit outlet. Be sure the opener is grounded.

RIGHT

WRONG

WARNING

PERMANENT WIRING CONNECTION

Green Ground Screw

Ground Wire

Ground Tab

White Wire

Black Wire

Facing the door from inside the garage

INSTALLATION STEP 10

Install The Protector System

The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction.

IMPORTANT INFORMATION ABOUT THE SAFETY REVERSING SENSOR

When properly connected and aligned, the sensor will detect an obstacle in the path of its electronic beam. The sending eye (with an amber indicator light) transmits an invisible light beam to the receiving eye (with a green indicator light). If an obstruction breaks the light beam while the door is closing, the door will stop and reverse to full open position, and the opener lights will flash 10 times.

The units must be installed inside the garage so that the sending and receiving eyes face each other across the door, no more than 6" (15 cm) above the floor. Either can be installed on the left or right of the door as long as the sun never shines directly into the receiving eye lens.

The mounting brackets are designed to clip onto the track of sectional garage doors without additional hardware.

If it is necessary to mount the units on the wall, the brackets must be securely fastened to a solid surface such as the wall framing. Extension brackets (see accessories) are available if needed. If installing in masonry construction, add a piece of wood at each location to avoid drilling extra holes in masonry if repositioning is necessary.

The invisible light beam path must be unobstructed. No part of the garage door (or door tracks, springs, hinges, rollers or other hardware) may interrupt the beam while the door is closing.

• Be sure power is not connected to the garage door opener BEFORE installing the safety reversing sensor.

• To prevent SERIOUS INJURY or DEATH from a closing garage 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

HIGHER than 6" (15 cm) above garage floor.

WARNING

Sensor Beam 6" (15 cm) max. above floor

Invisible Light Beam Protection Area

Sensor Beam 6" (15 cm) max. above floor

INSTALLING THE BRACKETS Be sure power to the opener is disconnected.

Install and align the brackets so the sensors will face each other across the garage door, with the beam no higher than 6" (15 cm) above the floor. They may be installed in one of three ways, as follows.

Garage door track installation (preferred):

• Slip the curved arms over the rounded edge of each door track, with the curved arms facing the door. Snap into place against the side of the track. It should lie flush, with the lip hugging the back edge of the track, as shown in Figure 1.

If your door track will not support the bracket securely, wall installation is recommended.

Wall installation (Figure 2 & 3):

• Place the bracket against the wall with curved arms facing the door. Be sure there is enough clearance for the sensor beam to be unobstructed.

• If additional depth is needed, an extension bracket (See accessories) or wood blocks can be used.

• Use bracket mounting holes as a template to locate and drill (2) 3/16" diameter pilot holes on the wall at each side of the door, no higher than 6" (15 cm) above the floor.

• Attach brackets to wall with lag screws (Not provided).

• If using extension brackets or wood blocks, adjust right and left assemblies to the same distance out from the mounting surface. Make sure all door hardware obstructions are cleared.

Floor installation (Figure 4):

• Use wood blocks or extension brackets (see accessories) to elevate sensor brackets so the lenses will be no higher than 6" (15 cm) above the floor.

• Carefully measure and place right and left assemblies at the same distance out from the wall. Be sure all door hardware obstructions are cleared.

• Fasten to the floor with concrete anchors as shown.

HARDWARE SHOWN ACTUAL SIZE

Figure 1

Figure 2

Figure 3

(Provided with Extension Bracket)

DOOR TRACK MOUNT (RIGHT SIDE)

Door Track

Lip

Sensor Bracket

WALL MOUNT (RIGHT SIDE)

Fasten Wood Block to Wall with Lag Screws (Not Provided)

WALL MOUNT (RIGHT SIDE)

Extension Bracket (See Accessories)

Lens

Inside

arage

all

Inside

arage

all

Indicator Light

Lens

Indicator Light

Lens

(Provided with Extension Bracket)

Indicator Light

Sensor Bracket

Lag Screws (Not Provided)

Sensor Bracket

Carriage Bolt 1/4"-20x1/2"

Wing Nut 1/4"-20

Staples

Figure 4

Inside

arage

all

FLOOR MOUNT (RIGHT SIDE)

Attach with Concrete Anchors (Not Provided)

Lens

Indicator Light

Sensor Bracket

Figure 5

MOUNTING AND WIRING THE SAFETY SENSORS

• Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor. Use wing nuts to fasten sensors to brackets, with lenses pointing toward each other across the door. Be sure the lens is not obstructed by a bracket extension (Figure 5).

• Finger tighten the wing nuts.

• Run the wires from both sensors to the opener. Use insulated staples to secure wire to wall and ceiling.

• Strip 1/4" (6 mm) of insulation from each set of wires. Separate white and white/black wires sufficiently to connect to the opener terminal screws: white to 2 and white/black to 3 (Figure 6).

ALIGNING THE SAFETY SENSORS

• Plug in the opener. The indicator lights in both the

sending and receiving eyes will glow steadily if wiring connections and alignment are correct.

The sending eye amber indicator light will glow regardless of alignment or obstruction. If the green indicator light in the receiving eye is off, dim, or flickering (and the invisible light beam path is not obstructed), alignment is required.

• Loosen the sending eye wing nut and readjust, aiming directly at the receiving eye. Lock in place.

• Loosen the receiving eye wing nut and adjust sensor until it receives the sender’s beam. When the green indicator light glows steadily, tighten the wing nut.

TROUBLESHOOTING THE SAFETY SENSORS

1. If the sending eye indicator light does not glow steadily 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 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. The opener lights will blink 10 times. See page 16.

Wing Nut

Carriage Bolt 1/4"-20x1/2"

Lens

Bell Wire

Sensor

Finished Ceiling

Invisible Light Beam Protection Area

Sensor

Bell Wire

Connect Wire to Opener Terminal screws

Door Control

Connections (dotted line)

OPENER TERMINAL SCREWS

Sensor Connections

2 3

Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit.

WARNING

INSTALLATION STEP 11

Fasten the Door Bracket

Follow instructions which apply to your door type as illustrated below or on the following page.

A horizontal reinforcement brace should be long enough to be secured to two or three vertical supports. A vertical reinforcement brace should cover the height of the top panel.

Figure 1 shows one piece of angle iron as the horizontal brace. For the vertical brace, 2 pieces of angle iron are used to create a U-shaped support. The best solution is to check with your garage door manufacturer for an opener installation door reinforcement kit.

NOTE: Many door reinforcement kits provide for direct attachment of the clevis pin and door arm. In this case you will not need the door bracket; proceed to Step 12.

SECTIONAL DOORS

1. Center the door bracket on the previously marked vertical centerline used for the header bracket installation. Note correct UP placement, as stamped inside the bracket.

2. Position the top edge of the bracket 2"-4" (5-10 cm) below the top edge of the door, OR directly below any structural support across the top of the door.

3. Mark, drill holes and install as follows, depending on your door’s construction:

Metal or light weight doors using a vertical angle iron brace between the door panel support and the door bracket:

• Drill 3/16" fastening holes. Secure the door bracket using the two 1/4"-14x5/8" self-threading screws. (Figure 2A)

• Alternately, use two 5/16" bolts, lock washers and nuts (not provided). (Figure 2B)

Metal, insulated or light weight factory reinforced doors:

• Drill 3/16" fastening holes. Secure the door bracket using the self-threading screws. (Figure 3)

Wood Doors:

• Use top and bottom or side to side door bracket holes. Drill 5/16" holes through the door and secure bracket with 5/16"x2" carriage bolts, lock washers and nuts (not provided). (Figure 4)

NOTE: The 1/4"-14x5/8" self-threading screws are not intended for use on wood doors.

Figure 1

Figure 2A

Figure 3

Figure 4

Figure 2B

HARDWARE SHOWN ACTUAL SIZE

Self-Threading Screw 1/4"-14x5/8"

CAUTION

Header Bracket

Door Bracket Location

HORIZONTAL AND VERTICAL REINFORCEMENT IS NEEDED FOR LIGHTWEIGHT GARAGE DOORS (FIBERGLASS, ALUMINUM, STEEL, DOORS WITH GLASS PANEL, ETC.). (NOT PROVIDED)

Vertical Reinforcement

Vertical Centerline of Garage Door

Bolt 5/16"-18x2"

Door Bracket

Lock Washer 5/16"

(Not Provided)

Bolt 5/16"x2"

Vertical Centerline of Garage Door

Nut 5/16"-18

Inside Edge of Door or Reinforcement Board

Vertical Reinforcement

Door Bracket

Self-Threading Screw 1/4"-14x5/8"

Vertical Centerline of Garage Door

Self-Threading Screw 1/4"-14x5/8"

(Not Provided)

ONE-PIECE DOORS

Please read and comply with the warnings and reinforcement instructions on the previous page. They apply to one-piece doors also.

• Center the door bracket on the top of the door, in line with the header bracket as shown. Mark either the left and right, or the top and bottom holes.

• Metal Doors: Drill 3/16" pilot holes and fasten the bracket with the 1/4"-14x5/8" self-threading screws provided.

• Wood Doors: Drill 5/16" holes and use 5/16"x2" carriage bolts, lock washers and nuts (not provided) or 5/16"x1-1/2" lag screws (not provided) depending on your installation needs.

NOTE: The door bracket may be installed on the top edge of the door if required for your installation. (Refer to the dotted line optional placement drawing.)

HARDWARE SHOWN

ACTUAL SIZE

Header Wall

Header

Bracket

Door Bracket

Optional Placement of Door Bracket

Vertical Centerline of Garage Door

2x4 Support

Finished Ceiling

HORIZONTAL AND VERTICAL REINFORCEMENT IS NEEDED

FOR LIGHTWEIGHT GARAGE DOORS (FIBERGLASS, ALUMINUM, STEEL, DOORS WITH GLASS PANEL, ETC.). (NOT PROVIDED)

Door Bracket

Nut 5/16"-18

Door Bracket

Self-Threading Screw 1/4"-14x5/8"

Top of Door (Inside Garage)

Optional Placement

METAL DOOR

Lock Washer 5/16"

Top of Door (Inside Garage)

Top Edge of Door

For a door with no exposed framing, or for the optional installation, use lag screws 5/16"x1-1/2" (Not Provided) to fasten door bracket.

Optional Placement

Carriage Bolt 5/16"x2" (Not Provided)

WOOD DOOR

INSTALLATION STEP 12

Connect Door Arm to Trolley

Follow instructions which apply to your door type as illustrated below and on the following page.

SECTIONAL DOORS ONLY

• Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from the inner trolley. Slide the outer trolley back (away from the door) about 2" (5 cm) as shown in Figures 1, 2 and 3.

• Figure 1:

– Fasten straight door arm section to outer trolley

with the 5/16"x1" clevis pin. Secure the connection with a ring fastener.

– Fasten curved section to the door bracket in the

same way, using the 5/16"x1-1/4" clevis pin.

• Figure 2:

– Bring arm sections together. Find two pairs of

holes that line up and join sections. Select holes as far apart as possible to increase door arm rigidity.

• Figure 3, Hole alignment alternative:

– If holes in curved arm are above holes in straight

arm, disconnect straight arm. Cut about 6" (15 cm) from the solid end. Reconnect to trolley

with cut end down as shown. – Bring arm sections together. – Find two pairs of holes that line up and join with

bolts, lock washers and nuts.

• Pull the emergency release handle toward the opener at a 45° angle so that the trolley release arm is horizontal. Proceed to Adjustment Step 1, page 23. Trolley will re-engage automatically when opener is operated.

Figure 1

Figure 2

Figure 3

HARDWARE SHOWN ACTUAL SIZE

Inner Trolley

Outer Trolley

Nuts 5/16"-18

Door Bracket

Ring Fastener

Door Bracket

Clevis Pin 5/16"x1-1/4"

Lock Washers 5/16"

Curved Door Arm

Bolts 5/16"-18x7/8"

Emergency Release Handle

Straight Door Arm

Clevis Pin 5/16"x1"

Nut 5/16"-18

Clevis Pin 5/16"x1" (Trolley)

Lock Washer 5/16"

Clevis Pin 5/16"x1-1/4" (Door Bracket)

Ring Fastener

Hex Bolt 5/16"-18x7/8"

Nuts 5/16"-18

Lock Washers 5/16"

Cut This End

Bolts 5/16"-18x7/8"

ALL ONE-PIECE DOORS

1. Assemble the door arm, Figure 4:

• Fasten the straight and curved door arm sections together to the longest possible length (with a 2 or 3 hole overlap).

• With the door closed, connect the straight door arm section to the door bracket with the 5/16"x1-1/4" clevis pin.

• Secure with a ring fastener.

2. Adjustment procedures, Figure 5:

• On one-piece doors, before connecting the door arm to the trolley, the travel limits must be adjusted. Limit adjustment screws are located on the left side panel as shown on page 23. Follow adjustment procedures below.

• Open door adjustment: decrease UP travel limit

- Turn the UP limit adjustment screw

counter-clockwise 4 turns.

- Press the Door Control push button. The trolley

will travel to the fully open position.

- Manually raise the door to the open position

(parallel to the floor), and lift the door arm to the trolley. The arm should touch the trolley just in back of the door arm connector hole. Refer to the fully open trolley/door arm positions in the illustration. If the arm does not extend far enough, adjust the limit further. One full turn equals 2" (5 cm) of trolley travel.

• Closed door adjustment: decrease DOWN travel limit

- Turn the DOWN limit adjustment screw

clockwise 4 complete turns.

- Press the Door Control push button. The trolley will travel to the fully closed position.

- Manually close the door and lift the door arm to the trolley. The arm should touch the trolley just ahead of the door arm connector hole. Refer to the fully closed trolley/door arm positions in the illustration. If the arm is behind the connector hole, adjust the limit further. One full turn equals 2" (5 cm) of trolley travel.

3. Connect the door arm to the trolley:

• Close the door and join the curved arm to the connector hole in the trolley with the remaining clevis pin. It may be necessary to lift the door slightly to make the connection.

• Secure with a ring fastener.

• Run the opener through a complete travel cycle. If the door has a slight "backward" slant in full open position as shown in the illustration, decrease the UP limit until the door is parallel to the floor.

NOTE: When setting the up limit on the following page, the door should not have a "backward" slant when fully open as illustrated below. A slight backward slant will cause unnecessary bucking and/or jerking operation as the door is being opened or closed from the fully open position.

Figure 4

Figure 5

Door Bracket

Clevis Pin 5/16"x1-1/4"

Straight Arm

Ring Fastener

Bolts 5/16"-18x7/8

Lock Washers 5/16"

Nuts 5/16"-18

Curved Door Arm

Door Arm

Closed Door

Inner Trolley

Door Arm Connector Hole

Inner Trolley

Open Door

Outer Trolley

Correct Angle

Emergency Release Handle

Outer Trolley

Door Arm

Door with Backward Slant (Incorrect)

+ 50 hidden pages

Chamberlain 1255LMCR-2 User Manual

TABLE OF CONTENTS

INTRODUCTION

Safety Symbol and Signal Word Review

Preparing your garage door

Tools needed

Planning

Carton Inventory

Attach the Rail to the Motor Unit

Attach the Chain to the Sprocket and Install the Sprocket Cover

INSTALLATION

Tighten the Chain

Determine the Header Bracket Location

Install the Header Bracket

Attach the Rail to the Header Bracket

Position the Opener

Hang the Opener

Install the Door Control

Install the Light

Attach the Emergency Release Rope and Handle

Electrical Requirements

Install The Protector System

MOUNTING AND WIRING THE SAFETY SENSORS

Fasten the Door Bracket

ONE-PIECE DOORS

Connect Door Arm to Trolley

ALL ONE-PIECE DOORS