First Alert 3120B 120VAC Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup

Photoelectric and Ionization Smoke Alarm w/ Battery Backup

The First Alert Hardwired Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup is designed to provide peace of mind. The photoelectric and ionization sensors on this fire detector alert you to both smoldering and fast-flaming fires, offering comprehensive detection and early warning. The 85-decibel fire alarm can connect to other compatible hardwired detectors for larger spaces.

Dual Sensors Detect Two Kinds of Fire

The First Alert Dual Sensor Smoke Alarm features photoelectric and ionization sensors for increased detection. The photoelectric sensor detects smoldering fires from objects like cigarettes burning on furniture or in trash cans, while the ionization sensor detects fast-flaming fires like erupting kitchen grease fires or combustibles. The dual sensors on this fire detector provide you and your family with the earliest warning possible.

Designed for Fewer False Alarms

Smoke from cooking or even shower steam can sometimes set off a smoke alarm. The photoelectric sensor on the First Alert Dual Sensor Smoke Alarm is sensitive to smoldering fires while reducing false alarms. The photoelectric sensor is smart enough to distinguish real threats from everyday activities, resulting in fewer annoying false alarms.

Battery Backup for Detection in a Power Outage

The fire detector is hardwired, but it also features a battery backup to help ensure the smoke alarm can still function in the event of a power outage. The unit requires two AA batteries, and comes with a low-power indicator to alert you when they need to be replaced. A one-touch silence/test button makes it easy to test the detector monthly or silence it during a false alarm.

Optipath 360 and Interconnectivity for Larger Spaces

The First Alert Dual Sensor Smoke Alarm easily connects to other compatible hardwired alarms, making it the perfect solution for larger buildings such as institutions, dormitories, hotels and other multi-family dwellings that use single station smoke detectors. The smoke and fire detector includes patented Optipath 360 technology that provides 360 degrees of access to the alarm, and its 85-decibel siren is designed to be loud enough to awaken even the soundest of sleepers.

First Alert Smoke Alarm 3120B

Photoelectric and Ionization Smoke Alarm w/ Battery Backup Features:

Utilizes both ionization and photoelectric smoke sensors for maximum protection.
Two Latching Features - Alarm Latch and Low Battery Latch.
Two Silence Features - Alarm Silence and Low Battery Silence.
Two AA Battery Backup.
Optipath 360 Technology.
Emits T3 Pattern.
Product Dimensions (LxWxH): 5.7 x 5.7 x 2.4 in.
Product Weight: .85 lbs.
10-Years Limited Warranty.

Product Specs

UPC:

029054007100

MPN:

3120B

Ionization smoke alarms are designed to identify fires that are defined by their rapid flaming qualities. These fires are characterized by their ability to generate and combust at an advanced speed (ie. kitchen grease fires or fires fueled by paper burning in a wastebasket).

Photoelectric smoke alarms specialize in detecting fires that are indicative of their slow smoldering properties. These fires are defined by their propensity to produce large smoke particles that can smolder for hours before bursting into larger flames (ie. those caused by cigarettes or candles burning on couches or bedding).

For maximum protection and full coverage from all types of fires, your best option is to use a smoke alarm that features both photoelectric and ionization sensing technologies.

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Average Customer Rating Based on 21 reviews:

First Alert Great products - 09/20/2018
Reviewer: Michael Wentink
I have just recently replaced all my smoke detectors throughout our 10 room B&B. I bought all First Alert units and particularly like the 2 AA battery design rather than the 9 volt. The batteries are much cheaper. I also later bought three wireless for each floor to improve fire alter status.

- 05/28/2018
Reviewer: Bonnie Scherer
Item received in good shape. Easy to install. Good instructions. Product works great.

Easy to use - 05/23/2018
Reviewer: Laura Pope
Keeps us safe

First alert fire alarm - 01/01/2018
Reviewer: Danilo Cable
Good product, easy to install. Look nice design.

- 09/22/2017
Reviewer: Erika Cordero
I needed a replacement for a discontinued Tek electronics model IL_930 Ionization smoke detector and this was perfect. Followed the directions and was easy to install plus it looks good. One very satisfied customer!

Easy install. Works great. - 07/31/2017
Reviewer: Richard Hunter
Replaced builder grade of competitive brand that was 10+ years old. Good to now have both smoke sensing technologies. Detector comes with batteries, mounting plates, paint cover and wiring pigtail. Remove old detector, wire new pigtail and base plate and plug it in.

- 02/02/2017
Reviewer: Asa Crane
I am replacing cheap and the installation was simple to carry over. No false alarms, which was problem with cheap.

Smoke Detector - 01/26/2017
Reviewer: Paul Silverman
Easy to install and looks good. Works well with first alert co/smoke detectors already in the house.

dual sensing - 10/21/2016
Reviewer: Daniel Zerby
After seeing some research about smoke detectors. Our business highly recommends dual sensing units over the low price Ionization to help my family and our customers feel safer.

BRK Hardwired Smoke Alarm - 09/14/2016
Reviewer: Nicholas Steiner
Excellent replacement for my Mother's Ten-Tek Electronics Model IL-930, Ionization Smoke Detector. Apparently Ten-Tek is out-of-business. Now I have a hardwired Smoke Detector which will detect both Photoelectric and Ionization fires.

Very Happy - 05/31/2016
Reviewer: Mary Nelson
We needed to replace our 3 smoke alarms so I contacted you. They came pretty fast & out daughter's boyfriend put them up. Only problem one of the alarms needed different batteries, so I suppose the other 2 will follow. Thank you.

- 10/09/2015
Reviewer: Len Gregg
Good item where fire and smoldering is a risk. I placed this one in an area of my stair well. This item seems to have a longer delay when testing with the interconnect hardwired. Would have liked it to have co. as well.

120VAC Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup - 09/30/2015
Reviewer: Thomas Woosnam
I have now received 3 of these smoke detectors and I am very pleased with the site and my ability to find stuff. I am also pleased with the shipping process: information and speed. One of my three is in use and works well. I will install the other two in the next several days. The install of # 1 was easy. I feel safe with these products. I recommend you use 1st Alert store and this smoke detection product. Tom W.

- 08/27/2015
Reviewer: Daniel Zerby
This is the only unit that we install into customers homes. We are dba Integrity Electric in western Colorado.

Quality Product - 05/15/2015
Reviewer: Bob Toth
Replaced my alarms after 10 years and this unit was easy to install. Battery drawer was a tad tough to open but got it done. Seems to be a well constructed unit.

Good product - 10/24/2014
Reviewer: Charles Hinton
Good for all types of smoke

Installed fairly easily - 09/23/2014
Reviewer: Robert Young
Once it was determined that the red wire in my hardwired system was designed to work with the orange wire these detectors use to communicate with each other the installation was fairly easy. I feel safer because they are designed to quickly detect both flames and smolders.

Replaced an old outdated unit - 02/20/2014
Reviewer: Gary Phillips
I used the test button on the unitwhile it was on the table using the battery backup before installing it hardwired. It worked perfectly. I hooked it up which was very easy since I already had an old hardwired unit in place. Total time was about 15 minutes. I tested it by lighting a small wad of lighted newspaper in a pie tin and held it under the unit. Within 6 seconds the alarm went off. Very easy to install and the battery box was well marked with + and - terminals.

completed and easy - 07/17/2013
Reviewer: gary mastny
I received and installed the detector and it connected easily to the rest of the wireless detectors.

- 04/17/2013
Reviewer: Glenn Cooke
very good product

Works Very Well - 11/03/2012
Reviewer: Johnathan P.
I replaced an old harwired alarm with this model and it works great. Installed it in 5 minutes and it still connects with my other alarms. This is a newer model because it has both photoelectric and ionization sensors. My experience was flawless and I am not very mechanical.

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Q: What is the proper placement of smoke alarms?

A: It is important that you have the proper placement for your smoke alarms. Install your alarms at least 20 feet from appliances like furnaces and ovens, which produce combustion particles. Alarms should be at least 10 feet from high humidity areas like showers and laundry rooms, and at least 3 feet from heat/AC vents. Be sure to install a smoke alarm in each bedroom, one at the top of each stairwell, and one on every level.

Q: My smoke alarm keeps chirping and beeping. Why does my smoke alarm chirp intermittently?

A: It is likely that the reason your smoke alarm keeps chirping and beeping is that the battery is low. Whenever your smoke alarm keeps chirping, replace the battery immediately.

Other reasons include: It could be a different device or appliance such as a security system, monitor, carbon monoxide alarm, or other device which has a similar low battery or alert signal. Some of the same factors that cause unwanted alarms can cause intermittent alarms: dust and insects in the alarm or power interruptions in hardwired alarms. Improper wiring on AC or AC/DC smoke alarms. AC alarms will chirp every 5 seconds if the interconnect wire is grounded. The orange interconnect wire should NEVER be grounded; it should only be used to interconnect other smoke alarms or compatible devices.

Q: Why doesn't my smoke alarm sound when I push the test button?

A: It is important that you frequently test your smoke alarms. When you are testing your smoke alarm, there are a number of reasons why the alarm might not sound:

You may not be holding the test button down long enough. Try holding it down for up to 10 seconds (20 seconds on photoelectric models) .
Your battery may not be installed properly or snapped all the way in place. Even if the alarm sounded briefly when the battery touched the terminals, you still need to make sure it is snapped securely in place. If the battery is loose, in cannot power the smoke alarm properly. After installing new batteries, be sure to test your smoke detector.
Your AC power may not be on. AC and AC/DC units will have a power indicator light (red or green) that shines continuously when they are receiving electrical power.
If you have a 10-Year model, the smoke alarm may not have been properly activated. If the tab broke away before the alarm was activated, you can use a toothpick to move the switch over to test the alarm.

Q: Why does my smoke alarm go off when I install a battery or turn on the AC power?

A: It is normal for smoke alarms to go off and sound briefly (up to 5-10 seconds) when you install a new battery or when they are powered up. If the alarm continues to go off and no smoke is present, the cause may be one of the following:

There may be insufficient battery power, try new batteries.
Problems with voltage or insufficient electrical power (brown out) may cause a continuous weak sounding alarm. For AC or AC/DC models, temporarily disconnect power at the service panel until the brown out is over. If you do not restore the AC power, your smoke alarms cannot warn you of a fire.
Incompatible warning device. If an incompatible alarm or auxiliary device is linked into a series of AC or AC/DC smoke alarms it may cause the system inadvertently go off.

Q: My smoke alarm keeps chirping, even with a new battery. What is causing this?

A: There are a number of possible causes for your smoke alarm to keep chirping even with a new battery.

It is possible that your smoke alarm "silence" button was pushed by mistake. The alarm will now "chirp" once a minute for up to 15 minutes before resetting.
Are you sure it's the smoke alarm? Funny to ask, but other devices have similar low battery chirps or warning tones.
Your "new" batteries may not be fresh. If batteries are stored, especially in cold areas like refrigerators, they lose their charge more quickly. Always check the freshness date on the package when buying new batteries. Keep plenty of replacement batteries on hand so that you are sure to always be protected by your smoke alarms.

Q: I lost my First Alert smoke alarm owner's manual. How can I get a new one?

A: First Alert smoke alarm owner's manuals are available online for download at no cost. Find your alarm in our Smoke Alarms section.

Q: Why does the National Fire Protection Association (NFPA) recommend that home smoke alarms be replaced after 10 years?

A: Smoke alarms have a limited life. Although each smoke alarm and all of its parts have passed many stringent tests and are designed to be as reliable as possible, any of these parts could fail over time. Therefore, you must test the devices weekly. The unit should be replaced immediately if it is not operating properly. The performance of smoke alarms older than 10 years is simply not reliable. To ensure your family's safety, all carbon monoxide and smoke/CO combination alarms need to be replaced every 5-7 years. All smoke alarms need to be replaced every 10 years.

If it's time to replace your alarms, consider the NEW 10-Year Life series and never have to worry about a battery replacement for the life of the alarm.10-Year alarms are available in smoke,carbon monoxide and combination alarms.

First Alert 3120B Smoke Alarm Manual

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