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