Chamberlain 3800 Mount the Battery Backup Unit (BBU) (not provided)

INSTALLATION STEP 8

Mount the Battery Backup Unit (BBU) (not provided)

If the optional 475LM battery backup unit is part of this installation it should be installed at this time.

•The BBU can be mounted to either the ceiling or a wall within 3' (.9 m) of the motor unit.

•Position the BBU as desired to a structural support (ceiling joist or wall stud).

• Attach the BBU to the support using the mounting holes on either side of the BBU.

• Secure the BBU using the 1-1/2" lag screws (2) provided with the BBU unit.

• Connect the BBU cord into the connector on the bottom of the motor unit.

•Follow all instructions included with the 475LM unit to test for proper operation and testing of the BBU.

BBU Cord

475LM Battery Backup Unit

Connector

Contents

For Residential Sectional Doors With Torsion Assemblies Only Introduction2-5 Assembly Installation7-16 Operation21-25 Programming26-28 Planning Preparing your Garage Door Tools needed Carton Inventory Hardware Inventory Attach the Collar to the Motor Unit Attach Mounting Bracket to Motor Unit Position the Opener Attach the Emergency Release Rope and Handle Install Power Door Lock Attach the Cable Tension Monitor (Required) Install the Control Console Install Remote Light Electrical Requirements Mount the Battery Backup Unit (BBU) (not provided) Install The Protector System® INSTALLING THE BRACKETS Be sure power to the opener is disconnected. Install Garage door track installation (preferred) (Figure 1): Wall installation (Figure 2 and 3): Floor installation (Figure 4): MOUNTING AND WIRING THE SAFETY REVERSING SENSORS ALIGNING THE SAFETY REVERSING SENSORS TROUBLESHOOTING THE SAFETY Program the Travel Limits Setting the Force Test the Safety Reversal System Test The Protector System® Test Cable Tension Monitor Test Power Door Lock To Open the Door Manually Using Your Garage Door Opener Using the Wall-Mounted Control Console CARE OF YOUR OPENER MAINTENANCE SCHEDULE Once a Month THE REMOTE CONTROL BATTERY Once a Year Having a Problem? (Continued) 1 FLASH FLASHES To Add or Reprogram a Hand-heldRemote Control To Erase All Codes From Motor Unit Memory *3-ButtonRemote To Add, Reprogram or Change a Keyless Entry PIN Reprogramming Light or Additional Light Installation Parts Motor Unit Assembly Parts ACCESSORIES 41A5281 Extension Brackets: 377LM Keyless Entry with Security✚®: LIFTMASTER® GARAGE DOOR OPENER FIVE-YEARLIMITED WARRANTY LIFETIME MOTOR LIMITED WARRANTY