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The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
®
GARAGE DOOR OPENER
Model 3850
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.
■ T
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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 wall-mounted door control . . . . . . . . . . . . . . . .27
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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 door is balanced and is not sticking or binding: • NEVER try to loosen, move or adjust garage door, door springs, cables, pul
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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 pag
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LOCK LIGHT 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. Remote Control Remote Control Visor Clip Visor Clip ® SECURITY✚ 3-Button Remote Control TM Smart Control Panel LCD Motion Detecting Model 373P (1) Battery Styrofoam
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ASSEMBLY STEP 1 Attach the Rail to the Motor Unit To avoid SERIOUS damage to opener, ONLY use bolts To avoid installation difficulties, do not run the garage mounted in top of motor unit. door opener until instructed to do so. � Remove the two washered bolts mounted on top of motor unit. � Align rail and styrofoam over belt pulley. Cut tape from rail, chain and styrofoam. � REMOVE STYROFOAM. USE ONLY THIS � Insert both washered bolts through the rail into the TYPE AND SIZE motor unit.
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ASSEMBLY STEP 3 Attach the Belt Cap Retainer To avoid possible SERIOUS INJURY to fingers from moving � Position the belt cap retainer over the motor unit belt garage door opener: pulley so the three holes in cap align with the three • ALWAYS keep hand clear of belt pulley while operating holes in mounting plate. Attach with #8x3/8" hex screws opener. provided. • Securely attach belt pulley cover BEFORE operating. You have now finished assembling your garage door opener. Please read the f
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INSTALLATION STEP 1 Unfinished Ceiling OPTIONAL Determine the Header Bracket 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 2x
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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 nail hole is for the garage door, or to the ceiling. Follow the instructions positioning only. which will work best for your particular requirements. Do You must use lag screws UP to mount the header bracket. not install the header bracket over drywall. If installing 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 Header Wall base. NOTE: If the door spring is in the way you’ll need help. Have someone hold the opener securely on a Header temporary support to allow the rail to clear the spring. Bracket � Position the rail bracket against the header bracket. Belt Pulley Bracket � Align the bracket holes and join with a clevis pin as shown.
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INSTALLATION STEP 4 Position the Opener To prevent damage to garage door, rest garage door opener Follow instructions which apply to your door type as rail on 2x4 placed on top section of door. 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. Rail � Open the door all the way and place a 2x4 laid flat on
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INSTALLATION STEP 5 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 (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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LOCK LOCK LOCK LOCK LOCK LIGHT LIGHT LIGHT INSTALLATION STEP 6 Install the Smart Control Panel™ To prevent possible SERIOUS INJURY or DEATH from Locate door control within sight of door, at a minimum electrocution: height of 5' (1.5 m) where small children cannot reach, • Be sure power is not connected BEFORE installing door away from moving parts of door and door hardware. If control. installing into drywall, drill 5/32" holes and use the anchors • Connect ONLY to 24 VOLT low voltage wir
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INSTALLATION STEP 7 Install the Standby Power (Optional) Battery Cover Battery � Make sure motor unit is unplugged. � Using a Phillips head screwdriver, remove the battery cover on the motor unit. � Partially insert battery into motor unit with terminals facing out. � Connect red (+) and black (-) wires from motor unit to corresponding terminals on battery. � Replace battery cover. INSTALLATION STEP 8 Install the Lights To prevent possible OVERHEATING of the endpanel or light socket: �
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NOTICE INSTALLATION STEP 9 Attach the Emergency Release Rope To prevent possible SERIOUS INJURY or DEATH from a falling and Handle garage door: � Thread one end of the rope through the hole in the top • If possible, use emergency release handle to disengage of the red handle so “NOTICE” reads right side up as trolley ONLY when garage door is CLOSED. Weak or broken shown. Secure with an overhand knot at least springs or unbalanced door could result in an open door falling rapidly and/or u
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INSTALLATION STEP 11 ® 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 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 required safety device MUST NOT be disabled. THE SAF
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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 � Slide a 1/4"-20x1/2" carriage bolt head into the slot on Wing Nut 1/4"-20 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 ceiling. TR
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INSTALLATION STEP 12 Fasten the Door Bracket Fiberglass, aluminum or lightweight steel garage doors WILL Follow instructions which apply to your door type as REQUIRE reinforcement BEFORE installation of door bracket. illustrated below or on the following page. Contact your door manufacturer for reinforcement kit. 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. HARDWARE SHOWN � Metal Doors: Drill 3/16" pilot holes and fasten the ACTUAL SIZE bracket with the 1/4"-14x5/8" self-threading screws provided. � Wood Doors: Drill 5/16" holes and use 5/16"x
