The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
■ Please read this manual and the enclosed safety materials carefully!
■ Fasten the manual near the garage 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 garage door opener are required to ensure safe operation.
■ The model number label is located behind the hinged door of your opener.
■ DO NOT exceed 10 complete cycles of door operation per hour.
For Residential and Light Duty Commercial Use
Install On Sectional Doors With Torsion
Assemblies Only
®
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Model 3800PC
GARAGE DOOR OPENER
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