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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.
■ The model num
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TABLE OF CONTENTS Introduction 2-5 Adjustment 23-25 Safety symbol and signal word review . . . . . . . . . . . . . .2 Program the travel limits . . . . . . . . . . . . . . . . . . . . . . . . .23 Preparing your garage door . . . . . . . . . . . . . . . . . . . . . . .3 Setting the force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 Tools needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Test the safety reversal system . . . . . . . . . . . . . . . . .
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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 garage CAUTION WARNING • 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, d
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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 p
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LIGHT LOCK Carton Inventory Your garage door opener is packaged in two cartons If anything is missing, carefully check the packing which contain the motor unit and all parts illustrated material. Parts may be stuck in the foam. Hardware for below. Accessories will depend on the model purchased. installation is also listed below. Remote Control Visor Clip ® SECURITY✚ 3-Button Remote Control Styrofoam Motion Detecting Battery Control Console (Optional) Belt Belt Cap Retainer Motor Unit w/Lig
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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 mounted in top of motor unit. To avoid installation difficulties, do not run the garage 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
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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 belt CAUTION WARNING • ALWAYS keep hand clear of belt pulley while operating pulley so the three holes in cap align with the three opener. holes in mounting plate. Attach with #8x3/8" hex • Securely attach belt pulley cover BEFORE operating. screws provided. You have now finished assembling your garage door o
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Unfinished INSTALLATION STEP 1 OPTIONAL Ceiling CEILING Determine the Header Bracket MOUNT FOR Location HEADER BRACKET Header Wall 2x4 WARNING WARNING Vertical Centerline of Garage Door To prevent possible SERIOUS INJURY or DEATH: 2x4 • Header bracket MUST be RIGIDLY fastened to structural Structural CAUTION WARNING 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 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 The nail hole is for above the garage door, or to the ceiling. Follow the positioning only. You must use lag screws instructions which will work best for your particular UP to mount the header bracket. requirements. Do not install the header bracket over drywall. If installing into masonry, use concrete anchors (not provided). Optional WALL HEADER BRACKET
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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 Header need help. Have someone hold the opener securely Bracket on a temporary support to allow the rail to clear the spring. Belt Pulley Bracket • Position the rail bracket against the header bracket. • Align the bracket holes and join with a clevis pin as shown. • Inser
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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 door-to-rail distance. • Raise the opener onto a stepladder. You will need help Rail at this point if the ladder is not tall enough. • Open the door all the way and
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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 supports of Three representative installations are shown. Yours may CAUTION the garage. Concrete anchors MUST be used if installing ANY WARNING 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 supp
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LOCK LIGHT LOCK LIGHT WARNING WARNING INSTALLATION STEP 6 CAUTION WARNING Install the Control Console To prevent possible SERIOUS INJURY or DEATH from electrocution: Locate control console within sight of the door at a • Disconnect ALL electric and battery power BEFORE minimum height of 5 feet where small children cannot performing ANY service or maintenance. reach, and away from moving parts of the door and door • Connect ONLY to 24 VOLT low voltage wires. hardware. The installation surface mus
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INSTALLATION STEP 7 Install the Battery Backup (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. WARNING WARNING INSTALLATION STEP 8 CAUTION WARNING Install the Lights To prevent possible OVERHEATING of the end
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NOTICE INSTALLATION STEP 9 WARNING WARNING Attach the Emergency Release Rope To prevent possible SERIOUS INJURY or DEATH from a and Handle falling garage door: CAUTION WARNING • If possible, use emergency release handle to disengage • Thread one end of the rope through the hole in the top trolley ONLY when garage door is CLOSED. Weak or broken of the red handle so “NOTICE” reads right side up as springs or unbalanced door could result in an open door shown. Secure with an overhand knot at least
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INSTALLATION STEP 11 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 and CAUTION WARNING To prevent SERIOUS INJURY or DEATH from a closing aligned correctly before the garage door opener will garage door: 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. Install DOOR TRACK MOUNT (RIGHT SIDE) Figure 1 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 installed in Door Track one of three ways, as follows. Lip Garage door track installation (preferred): Indicator • Slip the curved arms over the rounded edge of each Light 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 by Carriage Bolt a bracket extension (Figure 5). 1/4"-20x1/2" Lens • Finger tighten the wing nuts. • Run the wires from both sensors to the opener. Use TROUBLESHOOTING THE SAFETY insulated staples to secure wire to w
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WARNING WARNING INSTALLATION STEP 12 CAUTION WARNING 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 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 HARDWARE SHOWN ACTUAL SIZE bracket with the 1/4"-14x5/8" self-threading screws provided. • Wood Doors: Drill 5/16" holes and use 5/16"x2" carriag
