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The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
®
GARAGE DOOR OPENER
Models 3245CM 1/3 HP
3255CM 1/2 HP
3255-2CM 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 s
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TABLE OF CONTENTS Introduction 2-5Adjustment 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 . . . . . . . . . .
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1 Preparing your garage door Before you begin: To prevent possible SERIOUS INJURY or DEATH: � Disable locks. • ALWAYS call a trained door systems technician if garage � Remove any ropes connected to garage door. door binds, sticks or is out of balance. An unbalanced garage door may not reverse when required. � Complete the f ollowing test to make sure your garage • NEVER try to loosen, move or adjust garage door, door door is balanced and is not sticking or binding: springs, cables, pul
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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. FINISHED CEILING S
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Carton Inventory Your garage door opener is packaged in two cartons which If anything is missing, carefully check the packing material. contain the motor unit and all parts illustrated below. Parts may be stuck in the foam. Hardware for installation Accessories will depend on the model purchased. is also listed below. Models 3245CM, 3255CM (1) Model 3255-2CM (2) Sprocket Cover Remote Control ® Visor Clip SECURITY Multi-Function Single-Button Remote Control Door Control Panel Chain Styrofoam
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ASSEMBLY STEP 1 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 the opener. 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 USE ONLY THIS TYPE AND SIZE and motor unit line up. BOLT Washered Bolt � Thread one of the washered bolts pa
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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 � To tighten the chain, turn outer nut in the direction Inner Nut shown (Figure 1). � When the chain is approximately 1/2" (13 mm) above Trolley the base of the rail at its midpoint, re-tighten the inner nut to secure the adjustment. Figure 2 Sprocket noise can result if chain is too loose.
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Unfinished INSTALLATION STEP 1 Ceiling OPTIONAL Determine the Header Bracket CEILING MOUNT Location FOR HEADER BRACKET Header Wall 2x4 Vertical Centerline of Garage Door To prevent possible SERIOUS INJURY or DEATH: 2x4 • Header bracket MUST be RIGIDLY fastened to structural Structural Supports 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
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INSTALLATION STEP 2 Install the Header Bracket Wall Mounting Holes You can attach the header bracket either to the wall above CEILING MOUNT ONLY the garage door, or to the ceiling. Follow the instructions The nail hole is for positioning only. which will work best for your particular requirements. Do You must use lag screws UP not install the header bracket over drywall. If installing to mount the header bracket. into masonry, use concrete anchors (not provided). WALL HEADER BRACKET INSTALLA
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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. Header Wall � Position the rail bracket against the header bracket. Header Bracket � Align the bracket holes and join with a clevis pin as shown. Chain Pulley Bracket
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INSTALLATION STEP 4 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 door-to-rail distance. Rail � 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 p
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INSTALLATION STEP 5 Hang the Opener To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it SECURELY to structural supports of the Three representative installations are shown. Yours may garage. Concrete anchors MUST be used if installing any be different. Hanging brackets should be angled (Figure 1) brackets into masonry. to provide rigid support. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to structural supports before installing the
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LIGHT LIGHT LIGHT INSTALLATION STEP 6 Install the Door Control To prevent possible SERIOUS INJURY or DEATH from electrocution: Locate door control within sight of door at a minimum • Be sure power is not connected BEFORE installing door height of 5 feet (1.5 m) where small children cannot reach, control. and away from moving parts of door and door hardware. The installation surface must be smooth and flat. If • Connect ONLY to 24 VOLT low voltage wires. installing into drywall (Figure 1)
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NOTICE INSTALLATION STEP 7 Install the Light To prevent possible OVERHEATING of the endpanel or light socket: � Press the release tabs on both sides of lens. Gently • DO NOT use short neck or specialty light bulbs. rotate lens back and downward until the lens hinge is in • DO NOT use halogen bulbs. Use ONLY incandescent. the fully open position. Do not remove the lens. To prevent damage to the opener: � Install a 100 watt maximum light bulb in each socket. • DO NOT use bulbs larger than
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INSTALLATION STEP 9 Electrical Requirements To prevent possible SERIOUS INJURY or DEATH from electrocution or fire: To avoid installation difficulties, do not run the opener • Be sure power is not connected to the opener, and 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 grounding • Garage door installation and wiring MUST be in
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INSTALLATION STEP 10 ® 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 and To prevent SERIOUS INJURY or DEATH from a closing garage aligned correctly before the garage door opener will door: move in the down direction. • Correctly connect and align the safety reversing sensor. This IMPORTANT INFORMATION ABOUT required safety device MUST NOT be disabled. THE SA
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INSTALLING THE BRACKETS Figure 1 Be sure power to the opener is disconnected. Install DOOR TRACK MOUNT (RIGHT SIDE) and align the brackets so the sensors will face each other across the garage door, with the beam no higher than 6" Door (15 cm) above the floor. They may be installed in one of Track three ways, as follows. Lip Garage door track installation (preferred): Indicator Light � Slip the curved arms over the rounded edge of each door track, with the curved arms facing the door. Snap
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MOUNTING AND WIRING THE SAFETY REVERSING Figure 5 SENSORS Wing Nut 1/4"-20 � 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 Carriage Bolt extension (Figure 5). 1/4"-20x1/2" Lens � Finger tighten the wing nuts. � Run the wires from both sensors to the opener. Use insulated staples to secure wire to wall and ceiling. T
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INSTALLATION STEP 11 Fasten the Door Bracket Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Follow instructions which apply to your door type as Contact your door manufacturer for reinforcement kit. 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 Header the height of the top p
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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 ACTUAL SIZE provided. � Wood Doors: Drill 5/16" holes and use 5/16"x
