Chamberlain B750C User Manual

Smart Garage Opener
Contents
Preparation ...................................... 2-5
Assembly .......................................6-10
Installation ..................................11-28
Install the Door Control ............21-22
Install the Protector System® ....23-26
Connect power .........................27-28
Adjustments .................................29-31
MyQ® Smartphone Control .................32
Operation .....................................33-39
Using your Garage Door Opener .....34
To Open the Door Manually ...........34
Motion Detecting
Control Panel ...........................35-36
Multi-Function Control Panel .... 37-38
Remote Control .............................38
Homelink® ...................................38
To Erase the Memory .....................39
Maintenance .....................................40
Troubleshooting ........................... 41-42
Accessories ........................................ 43
Warranty ........................................... 44
Repair Parts ................................. 45-47
Owner’s Manual
B550C • B750C • B751C
Belt Drive Garage Door
Opener
FOR RESIDENTIAL USE ONLY
PRE-PROGRAMMED REMOTE CONTROL
INCLUDED
www.chamberlain.com
www.mychamberlain.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
®
is connected
and properly aligned.
• Periodic checks of the garage door opener are required to ensure
safe operation.
• The model number label is located on the left side panel of your
garage door opener.
• This garage door opener is compatible with MyQ® and
Security+b2.0® accessories.
• DO NOT install on a one-piece door if using devices or features
providing unattended close. Unattended devices and features are
to be used ONLY with sectional doors.

Chamberlain B750C Specifications

General

Drive System	Belt Drive
Motor Type	DC Motor
Smartphone Control	Yes
Connectivity	Wi-Fi
Battery Backup	No
LED Lighting	Yes
Horsepower	1/2 HP
Security	Rolling Code
Noise Level	Quiet
Warranty	Lifetime Motor Warranty

Summary

Preparation

Check the Door Balance and Condition

Assembly

Assemble Rail and Install Trolley

Step-by-step guide for assembling the opener rail and trolley.

Fasten Rail to Motor Unit

Instructions for securely attaching the assembled rail to the motor unit.

Install Idler Pulley

Install Belt

Guide for correctly installing and connecting the drive belt.

Tighten Belt and Install Sprocket Cover

Installation

Determine Header Bracket Location

Guidance on finding the correct position for the header bracket based on door type.

Install Header Bracket

Instructions for mounting the header bracket to the wall or ceiling.

Attach Rail to Header Bracket

Position Garage Door Opener

Hang Garage Door Opener

Instructions for securely hanging the opener unit to garage structural supports.

Attach Emergency Release Rope and Handle

Install Door Bracket

Steps for attaching the door bracket to the garage door.

Install Door Bracket (continued)

Further instructions for installing the door bracket on different door types.

Connect Door Arm to Trolley

Guide for connecting the door arm to the trolley assembly.

Connect Door Arm to Trolley (continued)

Additional steps for connecting the door arm on different door types.

Install Door Control

Wire Door Control and Attach Labels

Install Protector System® Sensors

Guide for installing the safety reversing sensors.

Install Protector System® Sensors (continued)

Further instructions for installing safety sensors on walls or floors.

Wire Safety Reversing Sensors

Wire Safety Reversing Sensors (continued)

Connect Power

Details on how to connect the opener to a power source.

Align Safety Reversing Sensors

Procedure for aligning the safety sensors for proper operation.

Ensure Door Control Wiring

Adjustments

Program Door Travel Limits

Step-by-step guide to set the open and close positions for the garage door.

Test Safety Reversal System

Procedure for testing the safety reversal system with an obstruction.

Test Protector System®

MyQ® Smartphone Control

Download and Set Up MyQ App

Operation

Using Your Garage Door Opener

Open Door Manually

Remote Control and Keyless Entry

Maintenance

Maintenance Schedule

Troubleshooting

Diagnostic Chart

Lists diagnostic codes, symptoms, and solutions for common opener problems.