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The Chamberlain Group, Inc. 845 Larch Avenue
Elmhurst, Illinois 60126-1196 www.liftmaster.com
®
GARAGE DOOR OPENER
Models 3245 1/3 HP 3255 1/2 HP 3255-2 1/2 HP
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.
TABLE OF CONTENTS |
|
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 |
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
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.
Electrical
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.
2
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.
Sectional Door |
One-Piece Door
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.
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.
Tools needed
During assembly, installation and adjustment of the opener, instructions will call for hand tools as illustrated below.
Carpenter’s
Level (Optional)
Pencil
1 |
2 |
Hack Saw
Tape Measure
Wire Cutters
|
Drill |
3/16", 5/16" and |
|
Claw Hammer |
|
|
5/32" Drill Bits |
|
Pliers |
|
|
|
|
|
Stepladder |
1/2" and 7/16" Sockets |
Screwdriver |
|
|
and Wrench |
|
Adjustable End Wrench |
||
|
|
|
||
3
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
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 |
FINISHED CEILING
Support bracket & fastening hardware is required.
See page 12.
Slack in chain tension is normal when garage door is closed.
Extension Spring
OR
Torsion Spring
Access Door
— — — |
Safety |
|
Reversing |
— — |
Sensor |
|
Gap between floor and bottom of door must not exceed 1/4" (6 mm).
Motor Unit
Wallmounted Door Control
Safety Reversing Sensor
ONE-PIECE DOOR WITHOUT TRACK
Slack in chain tension is normal when garage door is closed.
Header
Wall
FINISHED CEILING
Support bracket 
& fastening hardware is required. See page 12.
Motor Unit
Wallmounted Door Control
Access
Door
ONE-PIECE DOOR WITH TRACK
Slack in chain tension is normal when garage door is closed. 
Safety
Reversing Sensor
|
Gap between floor and bottom of |
Safety |
door must not exceed 1/4" (6 mm). |
Reversing Sensor
Safety
Reversing Sensor
Gap between floor and bottom of door must not exceed 1/4"
Access
Door
Safety
Reversing Sensor
(6 mm).
4
Carton Inventory
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.
3245 (1), 3255 (1), 3255-2 (2)
Sprocket Cover
LOCK |
|
Remote Control |
LIGHT |
|
|
Multi-Function |
SECURITY ® |
Visor Clip |
Single-Button Remote Control |
|
|
Door Control Panel |
|
|
|
|
Chain |
Styrofoam
Motor Unit with Light Lens
|
NLY |
|
T O |
G |
MOUN |
ILIN |
|
CE |
|
|
UP |
Header Bracket
Chain
Pulley Bracket
Safety Sensor
Bracket (2)
2 Conductor Bell Wire
White & White/Red?
One-Piece
Rail
Trolley
Door Bracket
The Protector System®
(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
INSTALLATION HARDWARE |
|
Hex Bolt 5/16"-18x7/8" (4) |
Insulated Staples (30) |
Lag Screw 5/16"-9x1-5/8" (2) |
Ring Fastener (3) |
Lag Screw 5/16"-18x1-7/8" (2) |
Drywall Anchors (2) |
Clevis Pin 5/16"x2-3/4" (1) |
Rail Grease |
Clevis Pin 5/16"x1-1/4" (1) |
Carriage Bolt 1/4"-20x1/2" (2) |
Clevis Pin 5/16"x1" (1) |
Wing Nut 1/4"-20 (2) |
Nut 5/16"-18 (4) |
Rope |
Lock Washer 5/16" (4) |
Handle |
Screw 6ABx1-1/4" (2) |
|
Screw 6-32x1" (2) |
|
Self-Threading Screw 1/4"-14x5/8" (2) |
|
|
|
5
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.
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of the opener.
USE ONLY THIS
TYPE AND SIZE
BOLT Washered Bolt 
5/16"-18x1/2"
Styrofoam
Rail
Hole
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.
Washered Bolts
5/16"-18x1/2"
Sprocket
USE ONLY THIS
TYPE AND SIZE
BOLT
Sprocket Cover
Back Tab Slot
Front Tab Slot |
Mounting |
|
|
|
Plate |
6
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. 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.
Figure 1
|
Lock |
|
Outer Nut |
Washer |
Inner Nut |
To Tighten Outer Nut |
|
|
|
|
|
|
|
To Tighten |
|
|
Inner Nut |
Trolley |
|
|
Figure 2 |
|
|
Chain |
|
|
1/2" (13 mm)
Base of Rail Mid Length of Rail
INSTALLATION
IMPORTANT INSTALLATION INSTRUCTIONS
WARNING
To reduce the risk of SEVERE INJURY or DEATH:
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.
7
INSTALLATION STEP 1
Determine the Header Bracket
Location
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.
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.
Unfinished
Ceiling
OPTIONAL
CEILING
MOUNT
FOR
HEADER
BRACKET
Header Wall |
2x4 |
Vertical Centerline
of Garage Door
2x4 Structural
Supports
Level 
(optional)
Header Wall |
|
|
|
2" (5 cm) |
Track |
Header Wall |
Track |
|
|
2" (5 cm) |
|
Highest Point |
|
|
|
of Travel |
|
Highest Point |
|
|
|
||
|
|
of Travel |
|
|
|
Door |
|
Door |
|
|
|
Sectional door with curved track |
One-piece door with horizontal track |
|
|
Header Wall |
|
Header Wall |
8" (20 cm) |
|
8" (20 cm) |
|
|
Highest |
Highest |
Door |
Point |
|
|
Point |
of Travel |
|
of Travel |
Door |
Jamb |
|
|
Hardware |
|
|
|
|
Pivot |
One-piece door without track: |
One-piece door without track: |
|
jamb hardware |
pivot hardware |
|
8
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
Lag Screw 5/16"-9x1-5/8"
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.
Ceiling Mounting Holes
CEILING MOUNT ONLY
UP
The nail hole is for positioning only.
You must use lag screws
to mount the header bracket.
Wall Mounting Holes
CEILING MOUNT ONLY
UP
Optional
Wall Mounting Holes
Header |
|
Wall |
NLY |
MOUN |
|
|
T O |
|
CEILING |
|
UP |
2x4 |
Header |
Structural |
Bracket |
Support |
|
The nail hole is for positioning only.
You must use lag screws
to mount the header bracket.
Vertical
Centerline of
Garage Door
Lag Screws 5/16"-9x1-5/8"
Door Spring
Horizontal
Line
Garage
Door
Highest Point of
Garage Door Travel Vertical
Centerline of
Garage Door
– Finished Ceiling –
|
|
Vertical |
|
Header |
Centerline |
|
of Garage Door |
|
|
Bracket |
|
|
|
|
6" (15 cm) |
UP |
|
Maximum |
|
|
Door |
|
Lag Screws |
Spring |
|
|
|
5/16"-9x1-5/8" |
|
|
|
|
|
|
Header Wall |
Garage Door |
Vertical |
|
|
|
|
|
Centerline |
|
|
of Garage Door |
|
9
Header Wall
Header Bracket
Chain Pulley
Bracket
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.
Rail |
Ring Fastener |
|
Header Bracket |
||
|
||
|
Clevis Pin |
|
|
5/16"x2-3/4" |
|
|
Chain |
|
|
Pulley |
|
|
Bracket |
|
|
Rail |
|
Garage |
|
|
Door |
|
|
|
Temporary |
|
|
Support |
HARDWARE SHOWN ACTUAL SIZE
Clevis Pin |
|
5/16"x2-3/4" |
Ring Fastener |
10
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.
Trolley
Release Arm
ENGAGED |
RELEASED |
To prevent damage to garage door, rest garage door opener rail on 2x4 placed on top section of door.
Rail
2x4 is used to determine Door the correct mounting height
from ceiling.
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.
11
Header
Bracket
Top of Door
2x4 is used to determine the correct mounting height from ceiling.
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