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Chamberlain 3850 - page 1
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1 196 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 Protec ...
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Chamberlain 3850 - page 2
2 Introduction 2-5 Safety symbol and signal word review . . . . . . . . . . . . . .2 Preparing your garage door . . . . . . . . . . . . . . . . . . . . . . .3 T ools needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Carton inventory . . . . ...
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Chamberlain 3850 - page 3
3 T o prevent damage to garage door and opener: • AL WA YS disable locks before installing and operating the opener . • ONL Y operate garage door opener at 120V , 60 Hz to avoid malfunction and damage. T o prevent possible SERIOUS INJURY OR DEA TH: • AL WA YS call a trained door systems technician if garage door binds, sticks, or is out of ba ...
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Chamberlain 3850 - page 4
Safety Re v ersing Sensor S u pport b racket & fastening hard w are is re qu ired. See page 12. — — — — — — — — Header W all FI N ISHED CEILI N G T orsion Spring Extension Spring OR Safety Re v ersing Sensor Gap b et w een floor and b ottom of door m u st not exceed 1/4" (6 mm) Access Door W all- mo u nted Door Control Hori ...
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Chamberlain 3850 - page 5
5 Straight Door Arm Section C u r v ed Door Arm Section Safety La b els and Literat u re Header Bracket U P C E IL I N G M O U N T O N L Y Belt Cap Retainer 2-Cond u ctor Bell W ire W hite & W hite/Red Remote Control Visor Clip Door Bracket One-Piece Rail Styrofoam Belt P u lley Bracket Belt T rolley SECURITY ✚ ® 3-B u tton Remote Control (2 ...
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Chamberlain 3850 - page 6
6 ASSEMBL Y STEP 1 Attach the Rail to the Motor Unit T o 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. • REMO V E STYROFOAM. • Insert both washer ...
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Chamberlain 3850 - page 7
7 ASSEMBL Y STEP 3 Attach the Belt Cap Retainer • Position the belt cap retainer over the motor unit belt pulley so the three holes in cap align with the three holes in mounting plate. Attach with #8x3/8" hex screws provided. Y ou have now finished assembling your garage door opener . Please read the following warnings before proceeding to t ...
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Chamberlain 3850 - page 8
8 INST ALLA TION STEP 1 Determine the Header Bracket Location Installation procedures vary according to garage door types. Follow the instructions which apply to your door . 1. Close the door and mark the inside vertical centerline of the garage door . 2. Extend the line onto the header wall above the door . Y ou can fasten the header bracket withi ...
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Chamberlain 3850 - page 9
9 INST ALLA TION STEP 2 Install the Header Bracket Y ou can attach the header bracket either to the wall above the garage door , or to the ceiling. Follow the instructions which will work best for your particular requirements. Do not install the header bracket over drywall. If installing into masonry , use concrete anchors (not provided). W ALL HEA ...
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Chamberlain 3850 - page 10
Clevis Pin 5/16"x2-3/4" Ring Fastener 10 Header Bracket Belt P u lley Bracket T emporary S u pport Header W all Garage Door Cle v is Pin 5/16"x2-3/4" Ring Fastener Header Bracket Belt P u lley Bracket Rail HARDW ARE SHOWN ACTUAL SIZE INST ALLA TION STEP 3 Attach the Rail to the Header Bracket • Position the opener on the garag ...
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Chamberlain 3850 - page 11
11 ONE-PIECE DOOR WITHOUT TRACK • With the door fully open and parallel to the floor , measure the distance from the floor to the top of the door . • Using a stepladder as a support, raise the top of the opener to this height. • The top of the door should be level with the top of the motor unit. Do not position the opener more than 4" (1 ...
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Chamberlain 3850 - page 12
12 INST ALLA TION STEP 5 Hang the Opener Three representative installations are shown. Y ours may be different. Hanging brackets should be angled (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 opener . This bracket and fastening hardware a ...
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Chamberlain 3850 - page 13
13 T o release w ire, p u sh in ta b w ith scre w dri v er tip Control Console Connections 7/16" (11 mm) Strip w ire 7/16" (1 1 mm) Red Grey W hite INST ALLA TION STEP 6 Install the Control Console Locate control console within sight of the door at a minimum height of 5 feet where small children cannot reach, and away from moving parts of ...
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Chamberlain 3850 - page 14
14 INST ALLA TION STEP 8 Install the Lights • Press the release tabs on both sides of lens. Gently rotate lens back and downward until the lens hinge is in the fully open position. Do not remove the lens. • Install up to a 100 watt maximum light bulb in each socket. The lights will turn ON and remain lit for approximately 4-1/2 minutes when pow ...
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Chamberlain 3850 - page 15
15 INST ALLA TION STEP 10 Electrical Requirements T o avoid installation difficulties, do not run the opener at this time. T o reduce the risk of electric shock, your garage door opener has a grounding type plug with a third grounding pin. This plug will only fit into a grounding type outlet. If the plug doesn’t fit into the outlet you have, cont ...
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Chamberlain 3850 - page 16
16 Facing the door from inside the garage INST ALLA TION STEP 11 Install The Protector System ® The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction. IMPORT ANT INFORMA TION ABOUT THE SAFETY REVERSING SENSOR When properly connected and aligned, the sensor will detect an o ...
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Chamberlain 3850 - page 17
17 DOOR TRACK MOUNT (RIGHT SIDE) Indicator Light Lens Lip Sensor Bracket Door Track FLOOR MOUNT (RIGHT SIDE) WALL MOUNT (RIGHT SIDE) Indicator Light Sensor Bracket Lens Extension Bracket (See Accessories) Inside G arage W all (Provided with Extension Bracket) (Provided with Extension Bracket) Figure 1 Figure 2 Figure 3 Figure 4 WALL MOUNT (RIGHT SI ...
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Chamberlain 3850 - page 18
18 Carriage Bolt 1/4"-20x1/2" Lens Wing Nut 1/4"-20 Figure 5 MOUNTING AND WIRING THE SAFETY REVERSING SENSORS • 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 ...
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Chamberlain 3850 - page 19
19 Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of door bracket. Contact your door manufacturer for reinforcement kit. WARN ING CAUTION WARN ING WARN ING INST ALLA TION STEP 12 Fasten the Door Bracket Follow instructions which apply to your door type as illustrated below or on the following p ...
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Chamberlain 3850 - page 20
20 Header Wall V ertical Centerline of Garage Door Finished Ceiling Optional Placement of Door Bracket Header Bracket Door Bracket 2x4 Support For a door with no exposed framing, or for the optional installation, use lag screws 5/16"x1-1/2" (Not Provided) to fasten door bracket. MET AL DOOR Top of Door (Inside Garage) Door Bracket Optiona ...
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Chamberlain 3850 - page 21
21 INST ALLA TION STEP 13 Connect Door Arm to T rolley Follow instructions which apply to your door type as illustrated below and on the following page. SECTIONAL DOORS ONL Y Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from the inner trolley . Slide the outer trolley back (away from the d ...
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Chamberlain 3850 - page 22
22 Door Arm Door Arm Connector Hole Closed Door Outer Trolley Emergency Release Handle Inner Trolley Outer Trolley Open Door Door Arm Correct Angle Door with Backward Slant (Incorrect) Inner Trolley Figure 5 ALL ONE-PIECE DOORS 1. Assemble the Door Arm: • Fasten the straight and curved door arm sections together to the longest possible length (wi ...
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Chamberlain 3850 - page 23
ADJUSTMENT STEP 1 Program the T ravel Limits Travel limits regulate the points at which the door will stop when moving up or down. Follow the steps below to set the limits. T o program the travel limits: Adjust the position of the door by using the black and purple buttons. Black moves the door UP (open) and purple moves the door DOWN (close). 1. S ...
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Chamberlain 3850 - page 24
Black B u tton P u rple B u tton P u sh P u rple bu tton t w ice to enter u nit into Indicator Light 24 ADJUSTMENT STEP 2 Setting the Force The force setting button is located on the left panel of the motor unit. The force setting measures the amount of force required to open and close the door . 1. Locate the purple button on the left panel of the ...
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Chamberlain 3850 - page 25
25 Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSL Y INJURED or KILLED by a closing garage door . • Safety reversal system MUST be tested ever y month. • After ANY adjustments are made, the safety reversal system MUST be tested. Door MUST reverse on contact with 1-1/2" high (3.8 ...
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Chamberlain 3850 - page 26
26 Using Y our Garage Door Opener Y our Security ✚ ® opener and hand-held remote control have been factory-set to a matching code which changes with each use, randomly accessing over 100 billion new codes. Y our opener will operate with up to eight Security ✚ ® remote controls and one Security ✚ ® Keyless Entry System. If you purchase a ne ...
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Chamberlain 3850 - page 27
27 Additional feature when used with the 3-button hand-held remote T o control the opener lights: 1. With the door closed, press and hold a small remote button that you want to control the light. 2. Press and hold the Light button on the control console. 3. While holding the Light button, press and hold the Lock button on the control console. 4. Af ...
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Chamberlain 3850 - page 28
28 NOTE: LED is most visible with worklight off. GREEN LED: All systems are normal. • A solid LED light indicates the battery is fully charged. • A flashing LED indicates the battery is being charged. NOTE: Battery do not have to be fully charged to operate the motor unit. ORANGE LED: The motor unit has lost power and is operating off of the ba ...
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Chamberlain 3850 - page 29
29 Care of Y our Opener MAINTENANCE SCHEDULE Once a Month • Manually operate door . If it is unbalanced or binding, call a trained door systems technician. • Check to be sure door opens & closes fully . Adjust limits and/or force if necessary . (See pages 23 and 24.) • Repeat the safety reverse test. Make any necessary adjustments. (See A ...
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Chamberlain 3850 - page 30
30 Having a Problem (T roubleshooting) NOTE: Always unplug battery prior to troubleshooting. 1. My door will not close and the light bulbs blink on my motor unit: The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction. • V erify the safety reversing sensors are properly in ...
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Chamberlain 3850 - page 31
31 Bell W ire Safety Re v ersing Sensor Diagnostics Located On Motor Unit “Learn” B u tton LED or Diagnostic LED “Learn” B u tton Installed Safety Sensor Y our garage door opener is programmed with self-diagnostic capabilities. The “Learn” button/diagnostic LED will flash a number of times then pause signifying it has found a potential ...
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Chamberlain 3850 - page 32
32 *3-Button Remotes If provided with your garage door opener , the large button is factory programmed to operate it. Additional buttons on any Security ✚ ® 3-button remote or mini-remote can be programmed to operate other Security ✚ ® garage door openers. T o Erase All Codes From Motor Unit Memory T o deactivate any unwanted remote, first er ...
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Chamberlain 3850 - page 33
33 1. Enter a four digit personal identification number (PIN) of your choice on the keypad. Then press and hold ENTER. 2. While holding the ENTER button, press and hold the LIGHT button on the Motion Detecting Door Control Console. 3. Continue holding the ENTER and LIGHT buttons while you press the push bar on the Motion Detecting Door Control Cons ...
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Chamberlain 3850 - page 34
34 2 5 6 1 3 7 8 4 KEY P ART NO. NO. DESCRIPTION 1 4A1008 Master link kit 2 41B5424 Belt pulley bracket 3 41B3869-1 Complete trolley assembly 4 109B33 T rolley clip 5 2777BD One-piece rail 6 41A5434-1 1 Full belt assembly 7 41B4103 T ensioner assembly 8 83A1 1-2 Rail grease 7 10 11 5 N O T IC E U P C E I L I N G M O U N T O N L Y 8 6 1 4 3 2 9 12 1 ...
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Chamberlain 3850 - page 35
35 10 10 10 10 9 1 2 3 8 7 6 4 5 11 11 KEY P ART NO. NO. DESCRIPTION 1 41C76 Belt cap and sprocket 2 41B4245 Line cord 3 41B4375-3 T erminal block with screws 4 41A6281 Wire harness kit Complete with: 41A6282 Battery wires and plug 41A6327 Light socket wires and plug 41A6328 RPM/passpoint wires with plug 5 41D794 Motor with positioning sensor 6 41D ...
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Chamberlain 3850 - page 36
36 ACCESSORIES CL O SED O PEN 374LM 370LM 915LM 395LM 990LM 1702LM Outside Quick Release: Required for a garage with N O access door . Enables homeowner to open garage door manually from outside by disengaging trolley . Remote Light Control: Enables homeowner to turn on a lamp, television or other appliance from car , bedside, or anywhere in the ho ...
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Chamberlain 3850 - page 37
37 NOTES ...
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Chamberlain 3850 - page 38
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Chamberlain 3850 - page 39
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Chamberlain 3850 - page 40
© 2006, The Chamberlain Group, Inc. 1 14A3281 All Rights Reserved HOW T O ORDER REP AIR P ARTS Selling prices will be furnished on request or parts will be shipped at prevailing prices and you will be billed accordingly . WHEN ORDERING REP AIR P ARTS, AL W A YS GIVE THE FOLLOWING INFORMA TION: • P ART NUMBER • P ART NAME • MODEL NUMBER ADDRE ...
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