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INSTALLATION STEP 3 Attach the T-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 Header Wall the rail to clear the spring. • Position the rail bracket against the header Header Bracket bracket. • Align the bracket holes and join with a clevis pin Chain Pulley Bracket as shown. • Ins
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WARNING WARNING INSTALLATION STEP 4 CAUTION WARNING Position the Opener To prevent damage to garage door, rest garage door opener rail on 2x4 placed on top section of door. 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 Rail 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. 2x4 is
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INSTALLATION STEP 5 WARNING WARNING Hang the Opener To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it SECURELY to structural Three representative installations are shown. Yours CAUTION WARNING supports of the garage. Concrete anchors MUST be used may be different. Hanging brackets should be angled if installing any brackets into masonry. (Figure 1) to provide rigid support. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to structural suppo
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WARNING WARNING INSTALLATION STEP 6 CAUTION WARNING Install the Door Control To prevent possible SERIOUS INJURY or DEATH from electrocution: Locate the door control within sight of the door at a • Be sure power is not connected BEFORE installing door minimum height of 5 feet (1.5 m) where small control. children cannot reach, and away from all moving • Connect ONLY to 24 VOLT low voltage wires. parts of the door and door hardware. To prevent possible SERIOUS INJURY or DEATH from a 1. Strip 1/4"
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NOTICE WARNING WARNING INSTALLATION STEP 7 CAUTION WARNING Install the Light To prevent possible OVERHEATING of the endpanel or light socket, INSTALL THE LIGHT • DO NOT use short neck or specialty light bulbs. • Install a 75 watt maximum light bulb in the socket. • DO NOT use halogen bulbs. Use ONLY incandescent. 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 replacemen
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INST WALLA ARNING TION STEP 9 WARNING Electrical Requirements To prevent possible SERIOUS INJURY or DEATH from electrocution or fire: To avoid installation difficulties, do not run the CAUTION WARNING • Be sure power is not connected to the opener, and opener at this time. disconnect power to circuit BEFORE removing cover to To reduce the risk of electric shock, your garage door establish permanent wiring connection. opener has a grounding type plug with a third • Garage door installation and wi
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INSTALLATION STEP 10 WARNING WARNING ® Install The Protector System • Be sure power is not connected to the garage door opener BEFORE installing the safety reversing sensor. The safety reversing sensor must be connected CAUTION WARNING • To prevent SERIOUS INJURY or DEATH from a closing and aligned correctly before the garage door garage door: opener will move in the down direction. – Correctly connect and align the safety reversing sensor. This required safety device MUST NOT be IMPORTANT INFOR
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INSTALLING THE BRACKETS Be sure power to the opener is disconnected. DOOR TRACK MOUNT (RIGHT SIDE) Figure 1 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 Door Track installed in one of three ways, as follows. Lip Garage door track installation (preferred): Indicator • Slip the curved arms over the rounded edge of Light each door track, with the curved arms facing the door. Snap into
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MOUNTING AND WIRING THE SAFETY SENSORS Figure 5 • Slide a 1/4"-20x1/2" carriage bolt head into the slot Wing Nut 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). Carriage Bolt 1/4"-20x1/2" • Finger tighten the wing nuts. Lens • Run the wires from both sensors to the opener. Use insulated staples to secure wire to wall and TROUBLESHOOTING THE SAFETY SENSORS c
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WARNING WARNING INSTALLATION STEP 11 CAUTION WARNING Fasten the Door Bracket Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of Follow instructions which apply to your door type as door bracket. Contact your door manufacturer for illustrated below or on the following page. reinforcement kit. A horizontal reinforcement brace should be long enough to be secured to two or three vertical supports. A vertical reinforcement brace should Header cov
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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 HARDWARE SHOWN provided. ACTUAL SIZE • Wood Doors: Drill 5/16" holes and use 5/16"x2" carriag
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The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
®
®
GARAGE DOOR OPENER
Models 1255-2R 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
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TABLE OF CONTENTS Introduction 2-5 Adjustment 23-25 Safety symbol and signal word review........................2 Adjust the travel limits ...............................................23 Preparing your garage door ........................................3 Adjust the force .........................................................24 Tools needed...............................................................3 Test the safety reversal system.................................25 ® Planning ..........
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1 Preparing your garage door WARNING WARNING Before you begin: To prevent possible SERIOUS INJURY OR DEATH: • Disable locks. • ALWAYS call a trained door systems technician if CAUTION WARNING • Remove any ropes connected to garage door. garage door binds, sticks, or is out of balance. An unbalanced garage door may not reverse when • Complete the following test to make sure your required. garage door is balanced and is not sticking or binding: • NEVER try to loosen, move or adjust garage door, d
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— — — — — — — — Slack in chain tension is normal when garage door is closed. Slack in chain tension is normal when garage door is closed. 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 INSTA
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Carton Inventory Your garage door opener is packaged in two cartons purchased. If anything is missing, carefully check the which contain the motor unit and all parts illustrated packing material. Parts may be stuck in the foam. below. Accessories will depend on the model Hardware for installation is also listed below. Remote Control Sprocket Cover Visor Clip ® Door Control Button SECURITY✚ (2) Single Button Remote Control (1) Styrofoam Chain Door Bracket Motor Unit with Light lens 2 Conductor B
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WARNING WARNING ASSEMBLY STEP 1 CAUTION WARNING Attach the Rail to the Motor Unit To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of To avoid installation difficulties, do not run the the opener. 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 Washered Bolt in rail and motor unit line up. 5/16"-18x1/2" USE ONLY THIS • Thread one of the
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Figure 1 ASSEMBLY STEP 3 Lock Tighten the Chain Washer Outer Nut Inner Nut To Tighten Outer Nut • Spin the inner nut and lock washer down the trolley threaded shaft, away from the trolley. To Tighten Inner Nut • To tighten the chain, turn outer nut in the direction shown (Figure 1). • When the chain is approximately 1/2" (13 mm) Trolley above the base of the rail at its midpoint, re-tighten Figure 2 the inner nut to secure the adjustment. Sprocket noise can result if chain is too loose. Chain Wh
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Unfinished OPTIONAL INSTALLATION STEP 1 Ceiling CEILING Determine the Header Bracket MOUNT FOR Location HEADER BRACKET 2x4 Header Wall WARNING WARNING Vertical Centerline of Garage Door To prevent possible SERIOUS INJURY or DEATH: 2x4 Structural • Header bracket MUST be RIGIDLY fastened to CAUTION Supports WARNING 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 moun
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INSTALLATION STEP 2 Install the Header Bracket Wall Mounting Holes You can attach the header bracket either to the wall CEILING MOUNT ONLY above the garage door, or to the ceiling. Follow the The nail hole is for positioning only. instructions which will work best for your particular You must use lag screws UP requirements. Do not install the header bracket to mount the header bracket. over drywall. If installing into masonry, use concrete anchors (not provided). WALL HEADER BRACKET INSTALLATI
