3840 Manual
Page 1
® GARAGE DOOR OPENER Model 3840 For Residential Use Only Com Details The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.LiftMaster.com patible with See Page 30 for Owner's Manual ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■...
® GARAGE DOOR OPENER Model 3840 For Residential Use Only Com Details The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.LiftMaster.com patible with See Page 30 for Owner's Manual ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■...
3840 Manual
Page 2
.../or the garage door opener if you do not comply with the warnings that accompany them carefully. 2 Mechanical Electrical When you see this manual. Read them . Read the warnings carefully. The hazard may come from something mechanical or from electric shock. TABLE OF CONTENTS Introduction 2-5 ...Using your garage door opener 26 Using the Smart Control Panel 27 Using the remote control 28 Troubleshooting 28 To open the door manually 28 Care of your garage door opener 28 Using the remote control 29 The remote control battery 29 Troubleshooting 29 Standby Power ...
.../or the garage door opener if you do not comply with the warnings that accompany them carefully. 2 Mechanical Electrical When you see this manual. Read them . Read the warnings carefully. The hazard may come from something mechanical or from electric shock. TABLE OF CONTENTS Introduction 2-5 ...Using your garage door opener 26 Using the Smart Control Panel 27 Using the remote control 28 Troubleshooting 28 To open the door manually 28 Care of your garage door opener 28 Using the remote control 29 The remote control battery 29 Troubleshooting 29 Standby Power ...
3840 Manual
Page 7
... to garage door control. 11. Install garage door opener ONLY on the floor. 13. Install garage door opener 7 feet (2.13 m) or more above floor. 7. Place manual release/safety reverse test label in garage door or opener mechanisms. 9. To avoid SERIOUS PERSONAL INJURY or DEATH from ALL moving parts of garage door...
... to garage door control. 11. Install garage door opener ONLY on the floor. 13. Install garage door opener 7 feet (2.13 m) or more above floor. 7. Place manual release/safety reverse test label in garage door or opener mechanisms. 9. To avoid SERIOUS PERSONAL INJURY or DEATH from ALL moving parts of garage door...
3840 Manual
Page 15
... the distance from a falling garage door opener, fasten it SECURELY to structural supports of the garage. Fasten the opener to required lengths. 3. Operate the door manually. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to opener at this time. Drill 3/16" pilot holes in line with the header bracket...
... the distance from a falling garage door opener, fasten it SECURELY to structural supports of the garage. Fasten the opener to required lengths. 3. Operate the door manually. On finished ceilings (Figure 2 and Figure 3), attach a sturdy metal bracket to opener at this time. Drill 3/16" pilot holes in line with the header bracket...
3840 Manual
Page 16
... travel . • ALWAYS keep garage door in sight until the sensor beam is Figure 2 LOCK LIGHT Figure 3 24 Volt Bell Wire near door control, and manual release/safety reverse test label in several places. Scroll speed of display is between -4° F (-20° C) and 122° F (50° C). Remove push bar...
... travel . • ALWAYS keep garage door in sight until the sensor beam is Figure 2 LOCK LIGHT Figure 3 24 Volt Bell Wire near door control, and manual release/safety reverse test label in several places. Scroll speed of display is between -4° F (-20° C) and 122° F (50° C). Remove push bar...
3840 Manual
Page 28
...horizontal. Weak or broken springs or unbalanced door could fall. CARE OF YOUR OPENER MAINTENANCE SCHEDULE Once a Month • Manually operate door. To Open the Door Manually DISCONNECT TROLLEY: The door should be fully closed . Adjust limits and/or force if necessary. Pull down Trolley on ...the next UP or DOWN operation, Emergency Release Handle either manually or by using (Pull at a 45° angle so that the trolley release arm snaps into a vertical position) and lift the Trolley...
...horizontal. Weak or broken springs or unbalanced door could fall. CARE OF YOUR OPENER MAINTENANCE SCHEDULE Once a Month • Manually operate door. To Open the Door Manually DISCONNECT TROLLEY: The door should be fully closed . Adjust limits and/or force if necessary. Pull down Trolley on ...the next UP or DOWN operation, Emergency Release Handle either manually or by using (Pull at a 45° angle so that the trolley release arm snaps into a vertical position) and lift the Trolley...
3840 Manual
Page 31
... and touching the floor: Repeat safety reverse test after adjustments to the Diagnostic Chart on the motor unit then refer to force or travel . • Manually check door for flashes on the following the programming instructions. The need for occasional adjustment for no apparent reason: Repeat safety reverse test after adjustments...
... and touching the floor: Repeat safety reverse test after adjustments to the Diagnostic Chart on the motor unit then refer to force or travel . • Manually check door for flashes on the following the programming instructions. The need for occasional adjustment for no apparent reason: Repeat safety reverse test after adjustments...
3840 Manual
Page 33
... user to program an additional remote control to see that the Safety Reversing Sensors' wires are blocked or if the wiring is disconnected. SEE OWNER'S MANUAL. To exit 'LOCK' mode, press and hold the button for a short (staple in wire), correct wiring polarity (black/white wires reversed), replace/attach as needed.... Meaning: This message will toggle to program another remote control by simply pressing the remote control button. PRESS LOCK BUTTON TO ENABLE REMOTE. SEE OWNER'S MANUAL. To clear the message, do not light, replace the safety sensors. Message LOCK MODE.
... user to program an additional remote control to see that the Safety Reversing Sensors' wires are blocked or if the wiring is disconnected. SEE OWNER'S MANUAL. To exit 'LOCK' mode, press and hold the button for a short (staple in wire), correct wiring polarity (black/white wires reversed), replace/attach as needed.... Meaning: This message will toggle to program another remote control by simply pressing the remote control button. PRESS LOCK BUTTON TO ENABLE REMOTE. SEE OWNER'S MANUAL. To clear the message, do not light, replace the safety sensors. Message LOCK MODE.
3840 Manual
Page 36
... sensor brackets (2) 14 485LM Battery NOT SHOWN 101D173 Push bar for door control 14 41A4675-7 Installation hardware bag (includes hardware listed on page 5) 114A3741 Owner's manual 114A3741SP Owner's manual-Spanish 36 REPAIR PARTS Rail Assembly Parts 5 3 6 1 7 4 Installation Parts 5 42 KEY PART NO. NO.
... sensor brackets (2) 14 485LM Battery NOT SHOWN 101D173 Push bar for door control 14 41A4675-7 Installation hardware bag (includes hardware listed on page 5) 114A3741 Owner's manual 114A3741SP Owner's manual-Spanish 36 REPAIR PARTS Rail Assembly Parts 5 3 6 1 7 4 Installation Parts 5 42 KEY PART NO. NO.
3840 Manual
Page 38
... to gain access by adding additional sensor modules. Enables homeowner to precisely park vehicles in control panel is designed to protect LiftMaster® garage door openers against damage from outside radio signals while you if your home! Wireless Door Control : Push bar... a specially designed keyboard. Fingerprint Keyless Entry : The system uses biometric technology that enables an authorized user to that is open garage door manually from lightning and power surges. 902LM/903LM 2 & 3 Door Multi-Function Wall Control: Ideal for homes with Security✚® : ...
... to gain access by adding additional sensor modules. Enables homeowner to precisely park vehicles in control panel is designed to protect LiftMaster® garage door openers against damage from outside radio signals while you if your home! Wireless Door Control : Push bar... a specially designed keyboard. Fingerprint Keyless Entry : The system uses biometric technology that enables an authorized user to that is open garage door manually from lightning and power surges. 902LM/903LM 2 & 3 Door Multi-Function Wall Control: Ideal for homes with Security✚® : ...