Smoke Alarm User’s Manual - Model 9120 - Introduction - Fire Safety Tips

Oct 23, 2026

User’s manual for an AC powered First Alert smoke alarm (models 9120 and 9120B) detailing operation, installation, features, and safety guidance. Covers smart nuisance-alarm reduction, single-button test/silence behavior, and the latching alarm indicator. Explains weekly testing, regular maintenance, indicator and horn patterns, recommended mounting practices, and what to do when the alarm sounds. Includes fire safety tips and limitations, emphasizing early warning only and that it does not detect gas, heat, or flame.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages7

Reading Time18 min

AccessFree to download

Introduction

Fire Safety Tips

Before You Install This Smoke Alarm

How To Install This Smoke Alarm

Optional Locking Features

Understanding the Indicator Lights and Alarm Horn Patterns

Weekly Testing

Regular Maintenance

If This Smoke Alarm Sounds

What To Do In Case Of Fire

Using the Silence Feature

“Latching Alarm” Indicator

If You Suspect a Problem

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USER’S MANUAL Smoke Alarms
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AC Powered Ionization Smoke Alarm with Silence and Latching Features
Model 9120
Input: 120V AC ~, 60 Hz, 0.04A
AC Powered Ionization Smoke Alarm with Battery Back-up, Silence and Latching Features Model 9120B
Input: 120V AC ~, 60 Hz, 0.04A
Printed in Mexico
M08-0134-003 K1 04/07

Models 9120
9120B | IMPORTANT! PLEASE READ CAREFULLY AND SAVE This user’s manual contains important information about your Smoke Alarm’s operation. If you are installing the Smoke Alarm for use by others, you must leave this manual—or a copy of it—with the end user. TABLE OF CONTENTS Introduction .................................................1 Fire Safety Tips ..............................................1 Before You Install This Smoke Alarm ..........................1-2 How To Install This Smoke Alarm .............................2-3 Optional Locking Features .....................................4 Understanding the Indicator Lightsand Alarm Horn Patterns ......................................5 Weekly Testing ...............................................5 Regular Maintenance .........................................5 If This Smoke Alarm Sounds ...................................5 What To Do In Case Of Fire ....................................5 Using the Silence Feature .....................................5 “Latching Alarm” Indicator ....................................6 If You Suspect a Problem ......................................6 All First Alert® and BRK® Smoke Alarms conform to regulatory requirements, including UL217 and are designed to detect particles of combustion. Smoke particles of varying number and size are produced in all fires. Ionization technology is generally more sensitive than photoelectric technology at detecting small particles, which tend to be produced in greater amounts by flaming fires, which consume combustible materials rapidly and spread quickly. Sources of these fires may include paper burning in a wastebasket, or a grease fire in the kitchen. Photoelectric technology is generally more sensitive than ionization technology at detecting large particles, which tend to be produced in greater amounts by smoldering fires, which may smolder for hours before bursting into flame. Sources of these fires may include cigarettes burning in couches or bedding. For maximum protection, use both types of Smoke Alarms on each level and in every bedroom of your home. Recommended Locations For Smoke Alarms .....................6 Locations To Avoid For Smoke Alarms .........................6-7 About Smoke Alarms .........................................7 Special Compliance Considerations .............................7 Limitations of Smoke Alarms ...................................7 Limited Warranty .............................................7 © 2007 BRK Brands, Inc. , a subsidiary of Jarden Corporation. 3901 Liberty Street Road, Aurora, IL 60504-8122 All rights reserved. Consumer Affairs: (800) 323-9005 [www.brkelectronics.com](www.brkelectronics.com) • [www.firstalert.com](www.firstalert.com) INTRODUCTION Thank you for choosing BRK Brands, Inc. for your Smoke Alarm needs. You have purchased a state-of-the-art Smoke Alarm designed to provide you with early warning of a fire. Key features include: Smart Technology designed to help reduce unwanted or nuisance alarms. Single Button Test/Silence eliminates confusion. Depending on what mode the alarm is in, pushing the button provides different functions such as testing the alarm, silencing the alarm, re-testing the alarm when in silence and clearing the Latching feature. Latching Alarm Indicator easily identifies initiating alarm even after the alarm condition has subsided. Perfect Mount System includes a gasketless base for easy installation anda new mounting bracket that keeps the alarm secure over a wide rotation range to allow for per

FAQs

What does the smoke alarm do and what are its limits?

The alarm monitors air and triggers when smoke reaches its sensing chamber, providing early warning. It only works if installed, maintained, and positioned so smoke can reach it, and it cannot sense gas, heat, or flame or prevent or extinguish fires.

How do you use the test and silence feature?

Single-button test/silence provides different functions depending on the alarm mode: testing, silencing, re-testing after silencing, and clearing the latching feature when in silence.

What actions should be taken if the smoke alarm sounds?

When it sounds, treat it as a potential fire situation and follow the manual’s guidance for what to do in case of fire, including escape planning. The manual also highlights keeping a working fire extinguisher and reliable means of escape on upper floors.

Oct 23, 2026

Uploaded by AfterMidnight