Chamberlain Liftmaster Professional 1/2 HP Manual

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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.

Help Topics Covered in this Manual:
Table of Contents:
Introduction 2-5
Safety symbol and signal word review ………………………….2
Preparing your garage door…………………………………………3
Tools needed …………………………………………………………….3
Planning …………………………………………………………………..4
Carton inventory ………………………………………………………..5
Hardware inventory…………………………………………………….5
Assembly 6-7
Attach the rail to the motor unit ……………………………………6
Attach the chain to the sprocket …………………………………..6
Tighten the chain ……………………………………………………….7
Installation 7-22
Installation safety instructions………………………………………7
Determine the header bracket location………………………….8
Install the header bracket ……………………………………………9
Attach the rail to the header bracket …………………………..10
Position the opener …………………………………………………..11
Hang the opener………………………………………………………12
Install the door control ………………………………………………13
Install the light………………………………………………………….14
Attach the emergency release rope and handle……………14
Electrical requirements ……………………………………………..15
Install the Protector System® …………………………………16-18
Fasten the door bracket ……………………………………….19-20
Connect the door arm to the trolley………………………..21-22
Adjustment 23-25
Adjust the travel limits……………………………………………….23
Adjust the force………………………………………………………..24
Test the safety reversal system ………………………………….25
Test the Protector System® ………………………………………..25
Operation 26-30
Operation safety instructions ……………………………………..26
Using your garage door opener………………………………….26
Using the wall-mounted door control…………………………..27
To open the door manually ………………………………………..27
Care of your garage door opener ……………………………….28
Having a problem?……………………………………………………29
Diagnostic chart ……………………………………………………….30
Programming 31-32
To add or reprogram a hand-held remote control………….31
To erase all codes…………………………………………………….31
3-Button remotes ……………………………………………………..31
To add, reprogram or change
a Keyless Entry PIN………………………………………………….32
Repair Parts 33-34
Rail assembly parts ………………………………………………….33
Installation parts……………………………………………………….33
Motor unit assembly parts …………………………………………34
Accessories 35
Repair Parts and Service 36
Warranty 36

Benefits:
This manual is designed and prepared in very simple and easy to understand way.
It talks about almost everything from introduction to assembly, installation, adjustment, operation, programming. It also helps to know about repair parts and accessories. Please click here to start reading this manual, you can also download it.