The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois
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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e
s l i ta
■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 #
(located on electrical box cover)
Installation Date