Owner’s Manual
■ Please read this manual and the enclosed safety materials carefully!
■ The door WILL NOT CLOSE unless The Protector System
®
is 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.
■ DO NOT use with sectional type doors.
■ This manual is to be left with the property owner.
DOOR OPERATOR
Model 3950
For Light Duty Commercial Use
The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
®
Serial #
(Located on electrical box cover)
Installation Date
2 YEAR WARRANTY
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