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The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
®
GARAGE DOOR OPENER
Model 3885C 3/4HP
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 loca
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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, do
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— — — — — — — — 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 FINISHED CEILING Support bracket & fastening hardware is required. Horizontal and vertical reinforcement See page
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LOCK LIGHT 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. Belt Cap Retainer ® SECURITY✚ Remote Control 3-Button Remote Control Transmitter Visor Clip Styrofoam Motion Detecting Door Control Console (LCD) Belt Motor Unit
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WARNING WARNING ASSEMBLY STEP 1 CAUTION WARNING Attach the Rail to the Motor Unit To avoid SERIOUS damage to opener, ONLY use bolts/fasteners mounted in top of motor unit. To avoid installation difficulties, do not run the garage door opener until instructed to do so. Washered Bolt • Remove the bolt and lock nut from the top of the 5/16"-18x1/2" Lock Nut motor unit. Styrofoam • Place rail onto the bolt mounted on the motor unit USE ONLY THIS Rail TYPE AND SIZE and align the back hole with the
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ASSEMBLY STEP 3 WARNING WARNING Attach the Belt Cap Retainer To avoid possible SERIOUS INJURY to fingers from moving garage door opener: • Position the belt cap retainer over the motor unit CAUTION WARNING • ALWAYS keep hand clear of sprocket while operating sprocket so the two holes in cap align with the two opener. holes in mounting plate. Attach with 8x3/8" hex • Securely attach sprocket cover BEFORE operating. screws provided. You have now finished assembling your garage door opener. Please
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INSTALLATION STEP 1 Unfinished Ceiling OPTIONAL Determine the Header Bracket CEILING Location MOUNT FOR HEADER BRACKET WARNING WARNING Header Wall 2x4 Vertical Centerline To prevent possible SERIOUS INJURY or DEATH: of Garage Door • Header bracket MUST be RIGIDLY fastened to CAUTION 2x4 WARNING Structural structural support on header wall or ceiling, otherwise Supports 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
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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 Header Wall opener securely on a temporary support to allow Header the rail to clear the spring. Bracket • Position the rail bracket against the header Belt Pulley bracket. Bracket • Align the bracket holes and join with a clevis pin as shown. • Insert
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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 Rail 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 2x4 is used to determine help at this point if the ladder i
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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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LOCK LOCK LIGHT LIGHT WARNING WARNING INSTALLATION STEP 6 CAUTION WARNING Install the Control Console To prevent possible SERIOUS INJURY or DEATH from Locate control console within sight of door, at a electrocution: minimum height of 5' (1.5 m) where small children • Be sure power is not connected BEFORE installing door cannot reach, away from moving parts of door and control. door hardware. If installing into drywall, drill 5/32" • Connect ONLY to 24 VOLT low voltage wires. holes and use the a
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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: • Press the release tabs on both sides of lens. • DO NOT use short neck or specialty light bulbs. Gently rotate lens back and downward until the • DO NOT use halogen bulbs. Use ONLY incandescent. lens hinge is in the fully open position. Do not To prevent damage to the opener: remove the lens. • DO NOT use bulbs larger than 100W. • Install a 100 watt maxi
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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 wir
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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 disabled. IMPORTANT
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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 Door higher than 6" (15 cm) above the floor. They may be Track installed in one of 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 into
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MOUNTING AND WIRING THE SAFETY Figure 5 REVERSING 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 Carriage Bolt by a bracket extension (Figure 5). 1/4"-20x1/2" Lens • Finger tighten the wing nuts. • Run the wires from both sensors to the opener. TROUBLESHOOTING THE SAFETY REVERSING Use insulated staples to secure
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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 door Follow instructions which apply to your door type as 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
