- About The Store
- Home Safety FAQs
View Cart 0
To be notified when this item is back In Stock, please enter your Email Address below:
You Save: $19.05 (32% Off)
This First Alert Hardwired Carbon Monoxide Alarm with Battery Back-up meets codes where CO alarms are required for new construction. Installation is seamless with the use of a quick plug-in power connector. Additional features such as a microprocessor that limits nuisance alarms and a single test/silence button add versatility to an already efficient carbon monoxide alarm.
First Alert Hardwired Carbon Monoxide Alarm CO5120BN
In this guide, we'll be showing you how to install First Alert Hardwired Smoke and Carbon Monoxide Alarms. Here are a few items you'll need before starting the installation process: Needle-nose pliers or utility knife, screwdriver, wire stripper, wire nuts and a ladder.
Hardwired Smoke or Carbon Monoxide Alarm Requirements:
To begin, turn off power at the junction box and connect your alarm to the building's electrical wiring.
|Attach to black wire on power connector|
|Attach to white wire on power connector|
Standalone (single-station) alarm: This wire is not needed; tuck the orange wire into the junction box.
If you are installing more smoke or carbon monoxide alarms, you'll want to repeat the process throughout the building. Interconnected smoke and co alarms must meet all requirements:
The same fuse or circuit breaker must power all interconnected alarms.
Up to 18 compatible detectors can interconnect, with a limit of 12 smoke alarms.
The total length of wire interconnecting the alarms should be less than 1,000 ft. (300 meters). This type of wire is commonly available at hardware and electrical supply stores.
All wiring must conform to all local electrical codes and NFPA 70 (NEC). Refer to NFPA 72, NFPA 101, and your local building code for more information.
Interconnect wiring diagram:
If you have any doubts or reservations about these interconnect requirements, please contact an experienced electrician to install your wiring and hardwired alarms.
Once you've installed your hardwired alarms, you'll want to restore power to the junction box. Under regular operation, the power indicator light on the alarm will shine/blink to indicate that it is receiving AC power.
Here's how you can test standalone or interconnected alarms:
Standalone Alarms: Press and hold the Test/Silence button until the unit triggers an alarm.
Interconnected Alarms: Press and hold the Test/Silence button until the first unit triggers an alarm. All interconnected detectors should sound off. Repeat this process to test each alarm in the interconnected series.
We make it as easy as possible to ensure you get the lowest prices available:
Average score based on 82 reviews
- Reviewed: 05/18/2022 by William H
- Reviewed: 03/31/2022 by Christopher S
The process of purchasing the new CO Alarm was fine. I did though like the old model CO5120PDBN, with the digital display better than looking up what the beep sequence is indicating.
- Reviewed: 03/07/2022 by John K
First alert carbon monoxide
- Reviewed: 02/18/2022 by Ivano B
Quick ship plugged in to existing wiring .
- Reviewed: 12/18/2020 by Richard Wambolt
First Alert CO5120BN Carbon Monoxide Alarm
My old detector quit working and this one fit perfectly. Easy install.
- Reviewed: 12/17/2020 by Tom Avezzie
- Reviewed: 12/17/2020 by Tom Avezzie
- Reviewed: 10/22/2020 by Richard Bear
Alarm does not stay affixed to base - purchased 2 units and had to use double side adhesive tape to secure the units to their base.
- Reviewed: 10/12/2020 by Barbara Cilla
Great customer service
- Reviewed: 09/08/2020 by Cecile Aylett
Very satisfied with items and service - courteous and helpful over the phone.