The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196

www.liftmaster.com

®

DOOR OPERATOR

Model 3900PLD

For Light Duty Commercial Use Install On

Sectional Doors With Torsion Assemblies Only

Owner’s Manual

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s l i a et

■Please read this manual and the enclosed safety materials carefully!

■Fasten the manual near the door after installation.

■The door WILL NOT CLOSE unless The Protector System® and cable tension monitor are connected and properly aligned.

■Periodic checks of the operator are required to ensure safe operation.

■The model number label is located behind the hinged door of your operator.

■Do NOT exceed 10 complete cycles of door operation per hour.

2 Y E A R W A R R A N T Y

Serial #

Installation Date