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The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.LiftMaster.com
®
GARAGE DOOR OPENER
Model 3840
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 m
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TABLE OF CONTENTS Introduction 2-5Operation 26-33 Safety symbol and signal word review. . . . . . . . . . . . . . . 2 Operation safety instructions . . . . . . . . . . . . . . . . . . . . . 26 Preparing your garage door . . . . . . . . . . . . . . . . . . . . . . . 3 Using your garage door opener . . . . . . . . . . . . . . . . . . . 26 ® Tools needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Using the Smart Control Panel . . . . . . . . . . . . . . . . . . . 27 Pla
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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 following 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, pu
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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. FINISHED CEILING SECTIONAL DOOR INSTALLATION Support bracket & fastening hardware is required. Horizontal and vertical reinforcement See pag
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LIGHT LOCK Carton Inventory Your garage door opener is packaged in two cartons which 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. If is also listed below. ® 2 Conductor Bell Wire SECURITY✚ White & White/Red 3-Button Remote Control ® Smart Control Panel Remote Control Visor Clip Header Bracket Curved Door Arm Section Rai
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ASSEMBLY STEP 1 HARDWARE SHOWN ACTUAL SIZE Fasten the Rail to the Motor Unit To avoid installation difficulties, do not run the garage door opener until instructed to do so. Hex Bolt 1/4"-20x7/16" To aid in assembly and installation, replace the foam packing around the motor unit. Remove it after Installation Step 5. � Working on a level surface, align the rail assembly with the motor unit, as shown. � Slip the coupling over the rail sprocket. � Slide the rail through the motor unit brack
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WARNING WARNING INSTALLATION IMPORTANT INSTALLATION INSTRUCTIONS WARNING WARNING To reduce the risk of SEVERE INJURY or DEATH: 1. READ AND FOLLOW ALL INSTALLATION WARNINGS AND 8. NEVER wear watches, rings or loose clothing while INSTRUCTIONS. installing or servicing opener. They could be caught in garage door or opener mechanisms. 2. Install garage door opener ONLY on properly balanced and lubricated garage door. An improperly balanced door may not 9. Install wall-mounted garage do
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INSTALLATION STEP 1 Unfinished Ceiling Determine the Header Bracket OPTIONAL CEILING Location MOUNT FOR HEADER BRACKET Header Wall 2x4 Vertical Centerline To prevent possible SERIOUS INJURY or DEATH: of Garage Door � Header bracket MUST be RIGIDLY fastened to structural 2x4 Structural support on header wall or ceiling, otherwise garage door Supports 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 the garage door, or to the ceiling. Follow the instructions CEILING MOUNT ONLY The nail hole is for which will work best for your particular requirements. Do positioning only. You must use lag screws not install the header bracket over drywall. If installing UP to mount the header bracket. into masonry, use concrete anchors (not provided). WALL HEADER BRACKET INSTAL
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INSTALLATION STEP 3 Attach the Rail to the Header Bracket NOTE: (Optional) With some existing installations, you may re-use the old header bracket with the two plastic spacers included in the hardware bag. Place the spacers inside the bracket on each side of the rail, as illustrated. � 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
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INSTALLATION STEP 4 ® Install The Protector System Be sure power is not connected to the garage door opener The safety reversing sensor must be connected and BEFORE installing the safety reversing sensor. aligned correctly before the garage door opener will To prevent SERIOUS INJURY or DEATH from a closing garage move in the down direction. door: � Correctly connect and align the safety reversing sensor. This IMPORTANT INFORMATION ABOUT THE SAFETY required safety device MUST NOT be dis
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INSTALLING THE BRACKETS Figure 1 DOOR TRACK MOUNT (RIGHT SIDE) Be sure power to the opener is disconnected. Install and align the brackets so the sensors will face each other Door across the garage door, with the beam no higher than Track 6" (15 cm) above the floor. They may be installed in one Lip of three ways, as follows: Indicator Garage door track installation (preferred): Light � Slip the curved arms over the rounded edge of each door track, with the curved arms facing the door. Sna
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MOUNTING THE SAFETY SENSORS � Slide a 1/4"-20x1/2" carriage bolt head into the slot on each sensor. Use wing nuts to fasten sensors to HARDWARE SHOWN ACTUAL SIZE brackets, with lenses pointing toward each other across the door. Be sure the lens is not obstructed by a bracket extension (Figure 5). � Finger tighten the wing nuts. Recommended Wire Routing Carriage Bolt Wing Nut Staples 1. Using insulated staples, run the wires from both sensors 1/4"-20x1/2" 1/4"-20 to the rail at the doo
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INSTALLATION STEP 5 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. � Raise the opener onto a stepladder. You will need help at this point if the ladder is not tall enough. Top of Door � Open the door all the way and place a 2x4 laid f
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INSTALLATION STEP 6 Hang the Opener To avoid possible SERIOUS INJURY from a falling garage door Three representative installations are shown. Yours may opener, fasten it SECURELY to structural supports of the garage. Concrete anchors MUST be used if installing ANY be different. Hanging brackets should be angled brackets into masonry. (Figure 1) to provide rigid support. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to structural supports before installing the o
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LOCK LOCK LOCK LOCK LIGHT LIGHT INSTALLATION STEP 7 ® Install the Smart Control Panel To prevent possible SERIOUS INJURY or DEATH from Locate door control within sight of door, at a minimum height electrocution: of 5 feet (1.5 m) where small children cannot reach, away � Be sure power is not connected BEFORE installing door from moving parts of door and door hardware. If installing control. into drywall, drill 5/32" holes and use the anchors provided. � Connect ONLY to 24 VOLT low
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NOTICE INSTALLATION STEP 8 Install the Standby Power (Optional) ALWAYS wear protective gloves and eye protection when changing the battery or working around the battery � Make sure motor unit is unplugged. compartment. � Using a Phillips head screwdriver, remove the battery cover on the motor unit. Battery Cover Battery � Partially insert battery into motor unit with terminals facing out. � Connect red (+) and black (-) wires from motor unit to corresponding terminals on battery. � Repl
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INSTALLATION STEP 11 Electrical Requirements To prevent possible SERIOUS INJURY or DEATH from To avoid installation difficulties, do not run the opener electrocution or fire: at this time. � Be sure power is not connected to the opener, and To reduce the risk of electric shock, your garage door disconnect power to circuit BEFORE removing cover to opener has a grounding type plug with a third grounding pin. establish permanent wiring connection. This plug will only fit into a grounding type
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INSTALLATION STEP 13 Fasten the Door Bracket Fiberglass, aluminum or lightweight steel garage doors WILL Follow instructions which apply to your door type REQUIRE reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit. as illustrated below and 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 Header the height of
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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 HARDWARE SHOWN and right, or the top and bottom holes. ACTUAL SIZE � Metal Doors: Drill 3/16" pilot holes and fasten the bracket with the 1/4"-14x5/8" self-threading screws provided. � Wood Doors: Drill 5/16" holes and use 5/16"x
