Chamberlain LiftMaster Professional Security+ 3245M User Manual

The Chamberlain Group, Inc.
845 Larch Avenue
Elmhurst, Illinois 60126-1196
www.liftmaster.com
GARAGE DOOR OPENER
Models 3245M 1/3 HP
3255M 1/2 HP
3255-2M 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 LiftMaster Professional Security+ 3245M Specifications

General

Brand	Chamberlain
Model	LiftMaster Professional Security+ 3245M
Category	Garage Door Opener
Language	English

Summary

Introduction: Safety Symbol and Signal Word Review

Understanding Safety and Cautionary Statements

Explains the meaning of WARNING and CAUTION symbols for safety and damage prevention.

Preparing Your Garage Door for Installation

Pre-Installation Safety Checks

Crucial warnings about door balance, tension, and entanglement hazards.

Important Installation Safety Instructions

Installation Step 1: Determine Header Bracket Location

Installation Step 2: Install the Header Bracket

Installation Step 3: Attach the Rail to the Header Bracket

Installation Step 4: Position the Opener

Installation Step 5: Hang the Opener

Installation Step 6: Install the Door Control

Safety Warnings for Door Control Installation

Crucial safety notices regarding electrocution and injury from closing garage doors.

Installation Step 8: Attach the Emergency Release Rope and Handle

Installation Step 9: Electrical Requirements

Installation Step 10: Install The Protector System®

Safety Warnings for Protector System Installation

Crucial safety notices before installing the safety reversing sensors.

Mounting Brackets for Safety Reversing Sensors

Wiring and Aligning Safety Reversing Sensors

Installation Step 11: Fasten the Door Bracket

Sectional Door Bracket Installation

One-Piece Door Bracket Installation

Installation Step 12: Connect Door Arm to Trolley

Connecting Door Arm for Sectional Doors

Connecting Door Arm for One-Piece Doors

Pre-Connection Travel Limit Adjustment for One-Piece Doors

Adjustment Step 1: Adjust UP and DOWN Travel Limits

Safety Warnings for Travel Limit Adjustments

Crucial safety notices related to travel limit adjustments and their impact on the safety reversal system.

Adjustment Step 2: Adjust the Force

Force Adjustment Safety Precautions

Important warnings regarding force adjustments and their effect on door operation and safety.

Adjustment Step 3: Test the Safety Reversal System

Adjustment Step 4: Test The Protector System®

Operation of Your Garage Door Opener

General Safety Instructions for Opener Operation

Essential safety guidelines to follow during all phases of opener operation.

Using the Wall-Mounted Door Control

Manually Opening the Garage Door

Troubleshooting Common Garage Door Opener Problems

Diagnostic Chart for Opener Issues

Programming Your Garage Door Opener

Managing Keyless Entry PINs