Chamberlain CG40DM 1/2 HP User Manual

The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.chamberlain.com
GARAGE DOOR OPENER
Model CG40DM 1/2 HP
For Residential Use Only
Owner’s Manual
■ 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
®
is connected and properly aligned.
■ Periodic checks of the opener are required to ensure safe operation.
■ The model number label is located on the front panel of your opener.

Chamberlain CG40DM 1/2 HP Specifications

General

Type	Chain Drive
Horsepower	1/2 HP
Max Door Height	7 feet
Drive System	Chain Drive
Remote Control	Yes
Speed	7 inches per second
Remote Controls Included	1
Battery Backup	No
Safety Features	Safety sensors
Security	Rolling code technology
Warranty	1 year

Summary

Safety and Preparation

Safety Symbol and Signal Word Review

Explains safety symbols and signal words used throughout the manual.

Preparing Your Garage Door

Assembly and Initial Installation

Assemble Rail and Install Trolley

Connects rail sections and installs the trolley assembly.

Install Idler Pulley and Chain

Install and Tighten the Chain

Connects the chain to the trolley and adjusts tension.

Determine Header Bracket Location

Identifies the optimal mounting position for the header bracket.

Install Header Bracket

Attach Rail and Position Opener

Safety Systems and Electrical

Electrical Requirements

Install The Protector System®

Installs the safety reversing sensors for obstruction detection.

Installing Safety Sensor Brackets

Door Connections and Adjustments

Fasten Door Bracket

Connect Door Arm to Trolley

Adjust Travel Limits

Sets the door's open and close points for optimal function.

Adjust Force Settings

Sets the motor's force for opening and closing the door.

Test Safety Systems

Verifies the safety reversal and protector system functionality.