Chamberlain 3500D 4

FINISHED CEILING

Support bracket & fastening hardware

is required. See page 13.

Horizontal and vertical reinforcement is needed for lightweight garage doors (fiberglass, steel, aluminum, door with glass panels, etc.). See page 20 for details.

Header Wall

Extension Spring

OR Torsion Spring

Safety

Reversing

Sensor

Safety

Reversing Sensor

Contents

For Residential Use Only Introduction Assembly Installation Adjustment Operation Preparing your garage door Tools needed Page Carton Inventory Hardware Inventory Attach the Rail to the Motor Unit Set the Belt Tension Attach the Belt Cap Retainer Determine the Header Bracket Location ONE-PIECEDOOR WITHOUT TRACK NOTE: EXAMPLE Install the Header Bracket Attach the Rail to the Header Bracket Position the Opener Hang the Opener Install the Door Control Install the Lights and Lens Attach the Emergency Release Rope and Handle Electrical Requirements Install The Protector System® INSTALLING THE BRACKETS Be sure power to the opener is disconnected Garage door track installation (preferred) (Figure 1): Wall installation (Figure 2 and 3): Floor installation (Figure 4): MOUNTING AND WIRING THE SAFETY SENSORS ALIGNING THE SAFETY SENSORS TROUBLESHOOTING THE SAFETY SENSORS Fasten the Door Bracket ONE-PIECEDOORS Metal Doors: Connect Door Arm to Trolley ALL ONE-PIECEDOORS 1.Assemble the Door Arm: Program the Travel Limits Setting the Force Test the Safety Reversal System Test The Protector System® Using Your Garage Door Opener Page CARE OF YOUR OPENER MAINTENANCE SCHEDULE Once a Month THE REMOTE CONTROL BATTERY Once a Year Having a Problem? (Continued) To Erase All Codes From Motor Unit Memory *3-ButtonRemotes Page Page Motor Unit Assembly Parts Page LIFTMASTER GARAGE DOOR OPENER FIVE-YEARLIMITED WARRANTY LIFETIME MOTOR AND BELT LIMITED WARRANTY