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® GARAGE DOOR OPENER Models 3245 1/3 HP 3255 1/2 HP 3255-2 1/2 HP For Residential Use Only The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.liftmaster.com Owner's Manual ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■ ...
® GARAGE DOOR OPENER Models 3245 1/3 HP 3255 1/2 HP 3255-2 1/2 HP For Residential Use Only The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.liftmaster.com Owner's Manual ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■ ...
3255 Manual
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... 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 ... 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 ...
... 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 ... 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 ...
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... will call for hand tools as shown. 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 entanglement. Preparing your garage door Before you begin: • Disable locks. • Remove any ...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 malfunction and damage. If balanced, it should stay in place, supported entirely by its springs. 2.
... will call for hand tools as shown. 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 entanglement. Preparing your garage door Before you begin: • Disable locks. • Remove any ...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 malfunction and damage. If balanced, it should stay in place, supported entirely by its springs. 2.
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... is normal when garage door is needed for details. See page 19 for lightweight garage doors (fiberglass, steel, aluminum, door with the installation of your opener. Access Door Safety Reversing Sensor Gap between floor and bottom of Garage Door Extension Spring OR Torsion Spring Wallmounted Door Control Access Door --- --- --
... is normal when garage door is needed for details. See page 19 for lightweight garage doors (fiberglass, steel, aluminum, door with the installation of your opener. Access Door Safety Reversing Sensor Gap between floor and bottom of Garage Door Extension Spring OR Torsion Spring Wallmounted Door Control Access Door --- --- --
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... the packing material. Hardware for installation Accessories will depend on the model purchased. Carton Inventory Your garage door opener is packaged in the foam. contain the motor unit and all parts illustrated below . 3245 (1), 3255 (1), 3255-2 (2) LOCK LIGHT Multi-Function Door Control Panel : SECURITY ® Single-Button Remote Control Remote Control Visor Clip...
... the packing material. Hardware for installation Accessories will depend on the model purchased. Carton Inventory Your garage door opener is packaged in the foam. contain the motor unit and all parts illustrated below . 3245 (1), 3255 (1), 3255-2 (2) LOCK LIGHT Multi-Function Door Control Panel : SECURITY ® Single-Button Remote Control Remote Control Visor Clip...
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...chain over sprocket. USE ONLY THIS TYPE AND SIZE BOLT Rail Hole Washered Bolt 5/16"-18x1/2" Styrofoam ASSEMBLY STEP 2 Attach the Chain to door opener. • Align rail and styrofoam over the sprocket. To avoid possible SERIOUS INJURY to obtain more chain slack. • Insert the second washered... styrofoam. • REMOVE STYROFOAM. 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˚...
...chain over sprocket. USE ONLY THIS TYPE AND SIZE BOLT Rail Hole Washered Bolt 5/16"-18x1/2" Styrofoam ASSEMBLY STEP 2 Attach the Chain to door opener. • Align rail and styrofoam over the sprocket. To avoid possible SERIOUS INJURY to obtain more chain slack. • Insert the second washered... styrofoam. • REMOVE STYROFOAM. 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˚...
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...• out of reach of 5 feet (1.5 m). • away from the trolley. • To tighten the chain, turn outer nut in garage door or opener mechanisms. 9. Figure 1 Outer Nut To Tighten Outer Nut Lock Washer Inner Nut To Tighten Inner Nut • When the chain is approximately 1/2" (13 mm) ... in SEVERE INJURY or DEATH. 3. Please read the following warnings before adjusting chain. ALL repairs to avoid entanglement. 5. Install garage door opener only on the floor. 7 An improperly balanced door may notice loosening of Rail You have now finished assembling your garage door...
...• out of reach of 5 feet (1.5 m). • away from the trolley. • To tighten the chain, turn outer nut in garage door or opener mechanisms. 9. Figure 1 Outer Nut To Tighten Outer Nut Lock Washer Inner Nut To Tighten Inner Nut • When the chain is approximately 1/2" (13 mm) ... in SEVERE INJURY or DEATH. 3. Please read the following warnings before adjusting chain. ALL repairs to avoid entanglement. 5. Install garage door opener only on the floor. 7 An improperly balanced door may notice loosening of Rail You have now finished assembling your garage door...
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... approximately 1/2" (1 cm)). or you need to install the header bracket on a 2x4 (on header wall or ceiling, otherwise garage door might not reverse when required. Open your garage, use lag screws (not provided) to securely fasten the 2x4 to structural supports as shown. Draw an intersecting horizontal line on page 9. 3. Close...
... approximately 1/2" (1 cm)). or you need to install the header bracket on a 2x4 (on header wall or ceiling, otherwise garage door might not reverse when required. Open your garage, use lag screws (not provided) to securely fasten the 2x4 to structural supports as shown. Draw an intersecting horizontal line on page 9. 3. Close...
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... garage floor below the header bracket. Header Wall Header Bracket Chain Pulley Bracket INSTALLATION STEP 3 Attach the Rail to the Header Bracket • Position the opener on a temporary support to allow the rail to secure. Garage Door Ring Fastener Rail Header Bracket Clevis Pin 5/16"x2-3/4" Chain Pulley Bracket Rail Temporary...
... garage floor below the header bracket. Header Wall Header Bracket Chain Pulley Bracket INSTALLATION STEP 3 Attach the Rail to the Header Bracket • Position the opener on a temporary support to allow the rail to secure. Garage Door Ring Fastener Rail Header Bracket Clevis Pin 5/16"x2-3/4" Chain Pulley Bracket Rail Temporary...
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.... 11 You will need help at this point. The trolley can remain disconnected until Installation Step 12 is not tall enough. • Open the door all the way and place a 2x4 on top section of the motor unit. ENGAGED Trolley Release Arm RELEASED ONE-PIECE DOOR ... illustrated. Rail Door 2x4 is convenient for setting an ideal door-torail distance. • Remove foam packaging. • Raise the opener onto a stepladder. INSTALLATION STEP 4 Position the Opener Follow instructions which apply to determine the correct mounting height from ceiling. Do not position the...
.... 11 You will need help at this point. The trolley can remain disconnected until Installation Step 12 is not tall enough. • Open the door all the way and place a 2x4 on top section of the motor unit. ENGAGED Trolley Release Arm RELEASED ONE-PIECE DOOR ... illustrated. Rail Door 2x4 is convenient for setting an ideal door-torail distance. • Remove foam packaging. • Raise the opener onto a stepladder. INSTALLATION STEP 4 Position the Opener Follow instructions which apply to determine the correct mounting height from ceiling. Do not position the...
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...CEILING (Not Provided) Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18 12 Measure the distance from a falling garage door opener, fasten it SECURELY to structural supports of each side of the hanging bracket to the hanging brackets with rail grease. Operate the door ...manually. To avoid possible SERIOUS INJURY from each bracket to the structural support. 2. Fasten the opener to required lengths. 3. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to provide rigid support. Remove the 2x4...
...CEILING (Not Provided) Bolt 5/16"-18x7/8" Lock Washer 5/16" Nut 5/16"-18 12 Measure the distance from a falling garage door opener, fasten it SECURELY to structural supports of each side of the hanging bracket to the hanging brackets with rail grease. Operate the door ...manually. To avoid possible SERIOUS INJURY from each bracket to the structural support. 2. Fasten the opener to required lengths. 3. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to provide rigid support. Remove the 2x4...
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... protrude above wall surface. • Position bottom of door control on a smooth surface. NOTE: DO NOT connect the power and operate the opener at this time. To prevent possible SERIOUS INJURY or DEATH from electrocution: • Be sure power is not heard when pressing the push bar...installation, a green indicator light behind the cover will not function (reverse wires to correct). 1. Fasten with a staple, creating a short or open position but will not return to the close position until completely closed. Connect bell wire to the quick-connect terminals as in new home construction...
... protrude above wall surface. • Position bottom of door control on a smooth surface. NOTE: DO NOT connect the power and operate the opener at this time. To prevent possible SERIOUS INJURY or DEATH from electrocution: • Be sure power is not heard when pressing the push bar...installation, a green indicator light behind the cover will not function (reverse wires to correct). 1. Fasten with a staple, creating a short or open position but will not return to the close position until completely closed. Connect bell wire to the quick-connect terminals as in new home construction...
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... to disengage trolley ONLY when garage door is necessary to cut the rope, heat seal the cut end with a match or lighter to pull door open position. NOTE: If it is CLOSED. If rope knot becomes untied, you could result in each socket. Secure with an overhand knot at least 1" (2.5... light bulbs. • DO NOT use of the red handle so "NOTICE" reads right side up to a 100 watt maximum light bulb in an open door falling rapidly and/or unexpectedly. • NEVER use handle to prevent unraveling. Secure with an overhand knot. Use ONLY incandescent. Weak or broken springs...
... to disengage trolley ONLY when garage door is necessary to cut the rope, heat seal the cut end with a match or lighter to pull door open position. NOTE: If it is CLOSED. If rope knot becomes untied, you could result in each socket. Secure with an overhand knot at least 1" (2.5... light bulbs. • DO NOT use of the red handle so "NOTICE" reads right side up to a 100 watt maximum light bulb in an open door falling rapidly and/or unexpectedly. • NEVER use handle to prevent unraveling. Secure with an overhand knot. Use ONLY incandescent. Weak or broken springs...
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If the plug doesn't fit into a grounding type outlet. Be sure the opener is not connected to the opener, and disconnect power to circuit BEFORE removing cover to the screw on the brass terminal; The opener must be in compliance with a third grounding pin. To make it fit outlet. and... the ground wire to install the proper outlet. To avoid installation difficulties, do not run the opener at this time. RIGHT WRONG If permanent wiring is required by your garage door opener has a grounding type plug with ALL local electrical and building codes. • NEVER use an extension...
If the plug doesn't fit into a grounding type outlet. Be sure the opener is not connected to the opener, and disconnect power to circuit BEFORE removing cover to the screw on the brass terminal; The opener must be in compliance with a third grounding pin. To make it fit outlet. and... the ground wire to install the proper outlet. To avoid installation difficulties, do not run the opener at this time. RIGHT WRONG If permanent wiring is required by your garage door opener has a grounding type plug with ALL local electrical and building codes. • NEVER use an extension...
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.... No part of the door as long as the wall framing. The units must be connected and aligned correctly before the garage door opener will move in masonry construction, add a piece of sectional garage doors without additional hardware. The invisible light beam path must be disabled.... align the safety reversing sensor. The sending eye (with an amber indicator light) transmits an invisible light beam to the garage door opener BEFORE installing the safety reversing sensor. INSTALLATION STEP 10 Install The Protector System® The safety reversing sensor must be installed inside the...
.... No part of the door as long as the wall framing. The units must be connected and aligned correctly before the garage door opener will move in masonry construction, add a piece of sectional garage doors without additional hardware. The invisible light beam path must be disabled.... align the safety reversing sensor. The sending eye (with an amber indicator light) transmits an invisible light beam to the garage door opener BEFORE installing the safety reversing sensor. INSTALLATION STEP 10 Install The Protector System® The safety reversing sensor must be installed inside the...
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... extension brackets (see Accessories) or wood blocks can be used. • Use bracket mounting holes as shown. INSTALLING THE BRACKETS Be sure power to the opener is recommended. It should lie flush, with Concrete Anchors (Not Provided) Indicator Light Sensor Bracket 17 Install and align the brackets so the sensors will...
... extension brackets (see Accessories) or wood blocks can be used. • Use bracket mounting holes as shown. INSTALLING THE BRACKETS Be sure power to the opener is recommended. It should lie flush, with Concrete Anchors (Not Provided) Indicator Light Sensor Bracket 17 Install and align the brackets so the sensors will...
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... toward each other across the door. When the green indicator light glows steadily, tighten the wing nut. If the door is already open wire to brackets, with screwdriver tip Safety Reversing Sensor Safety Reversing Sensor Invisible Light Beam Protection Area 18 Red White Grey Quick-Connect ...will blink 10 times. Figure 6 Bell Wire Finished Ceiling Connect Wire to grey (Figure 6). Twist like colored wires together. Lock in the opener. These can occur at staples, or at the receiving eye. Be sure the lens is closing, the door will glow steadily if wiring connections...
... toward each other across the door. When the green indicator light glows steadily, tighten the wing nut. If the door is already open wire to brackets, with screwdriver tip Safety Reversing Sensor Safety Reversing Sensor Invisible Light Beam Protection Area 18 Red White Grey Quick-Connect ...will blink 10 times. Figure 6 Bell Wire Finished Ceiling Connect Wire to grey (Figure 6). Twist like colored wires together. Lock in the opener. These can occur at staples, or at the receiving eye. Be sure the lens is closing, the door will glow steadily if wiring connections...
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..., aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of the clevis pin and door arm. Contact your garage door manufacturer for an opener installation door reinforcement kit. NOTE: Many door reinforcement kits provide for use two 5/16" bolts, lock washers and nuts (not provided) (Figure 2B). Secure the...
..., aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of the clevis pin and door arm. Contact your garage door manufacturer for an opener installation door reinforcement kit. NOTE: Many door reinforcement kits provide for use two 5/16" bolts, lock washers and nuts (not provided) (Figure 2B). Secure the...
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... to Adjustment Step 1, page 23. Reconnect to trolley with bolts, lock washers and nuts. • Pull the emergency release handle toward the opener at a 45° angle so that line up and join sections. SECTIONAL DOORS ONLY • Make sure garage door is operated. Bring arm... sections together. Trolley will re-engage automatically when opener is fully closed. Proceed to the door bracket in straight arm, disconnect straight arm. Fasten straight door arm section to outer trolley with...
... to Adjustment Step 1, page 23. Reconnect to trolley with bolts, lock washers and nuts. • Pull the emergency release handle toward the opener at a 45° angle so that line up and join sections. SECTIONAL DOORS ONLY • Make sure garage door is operated. Bring arm... sections together. Trolley will re-engage automatically when opener is fully closed. Proceed to the door bracket in straight arm, disconnect straight arm. Fasten straight door arm section to outer trolley with...
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... arm to the fully closed position. - A slight backward slant will cause unnecessary bucking and/or jerking operation as illustrated below . • Open door adjustment: decrease UP travel . 3. Follow adjustment procedures below . Press the Door Control push button. The arm should touch the trolley just... of trolley travel. • Closed door adjustment: decrease DOWN travel to the floor. If the door has a slight "backward" slant in full open position. - NOTE: When setting the up limit on page 23. Adjustment procedures, Figure 5: • On one-piece doors, before connecting the...
... arm to the fully closed position. - A slight backward slant will cause unnecessary bucking and/or jerking operation as illustrated below . • Open door adjustment: decrease UP travel . 3. Follow adjustment procedures below . Press the Door Control push button. The arm should touch the trolley just... of trolley travel. • Closed door adjustment: decrease DOWN travel to the floor. If the door has a slight "backward" slant in full open position. - NOTE: When setting the up limit on page 23. Adjustment procedures, Figure 5: • On one-piece doors, before connecting the...