Most carbon zinc batteries have an average service life of 1 year; most alkaline batteries have an average serv- ice life of 1-2 years; most Lithium batteries have an average service life of 6-10 years. Actual service life depends on the smoke alarm and the environment in which it is installed. All the batteries specified above are acceptable replacement batteries for this unit. Regardless of the manufacturer’s suggested battery life, you MUST replace the battery immediately once the unit starts “chirping” (the “low battery warning”).

IF THIS SMOKE ALARM SOUNDS

If the alarm sounds and you are not testing it, it is warning you of a potentially dangerous situation that requires your immediate attention.

NEVER ignore any alarm. Ignoring the alarm may result in injury or death. If the unit alarms and you are not absolutely certain of the source of the smoke, get everyone out of the house immediately.

Responding To An Alarm

If the unit alarms and you are not absolutely certain of the source of the smoke, get everyone out of the dwelling immediately. Stay calm and follow your family escape plan. Stay as low to the ground as possible, and cover your mouth with a damp cloth. Never open a door before testing to see if it is hot. Call the Fire Department from outside, and give them your address then name. Read “What To Do In Case Of Fire” at the end of this manual for more information. If the unit alarms and you are certain that the source of smoke is not a fire—cooking smoke or an extremely dusty fur- nace, for example—open a nearby window or door

and fan the smoke away from the unit (Model 4120SB Only: use the Silence Feature to silence the alarm). This will silence the alarm, and once the smoke clears the unit will reset itself automatically.

NOTE: When an interconnected system of AC powered units is in alarm, the alarm indicator light on the unit(s) that initiated the alarm will blink rapidly. It will remain OFF on any remaining units.

Never disconnect the AC power to quiet an unwanted alarm. Disconnecting the power disables the Smoke Alarm so it cannot sense smoke. This will remove your protection.

ELECTRICAL SHOCK HAZARD: Attempting to dis- connect the power connector from the unit when the power is on may result in electrical shock, serious injury or death.

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BRK electronic 4120SB, 4120 AC user manual If this Smoke Alarm Sounds, Responding To An Alarm
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4120 AC, 4120SB specifications

The BRK Electronics 4120SB and 4120AC are advanced smoke alarms designed to enhance safety in residential and commercial settings. These alarm models integrate innovative technologies and features that provide reliable performance and peace of mind to users.

The 4120SB model is a battery-operated smoke alarm, making it ideal for applications where hardwired alarms may not be feasible. Utilizing a photoelectric sensor, it is designed to detect smoldering fires, which often produce dense smoke without high flames. This increases the likelihood of early detection, allowing occupants crucial time to evacuate safely. On the other hand, the 4120AC is a hardwired option that connects directly to the building’s electrical system, ensuring uninterrupted power supply while incorporating a battery backup. This guarantees continuous operation, even during power outages.

Both models are equipped with a loud 85-decibel alarm, ensuring that residents are alerted promptly in case of smoke detection. The devices also feature a test/silence button, allowing users to easily test the functionality of the alarm or silence it in the event of a false alarm caused by cooking fumes.

Safety is further enhanced by the incorporation of a Tamper-resistant feature that prevents unauthorized removal of the alarm from its mounted location. The alarm also includes a LED indicator that provides a visual cue of the unit’s operational status. When the unit is powered on and functioning correctly, the green LED will blink periodically. In contrast, a continuous red LED indicates an active alarm condition.

Both the 4120SB and 4120AC are designed for user-friendly installation. The units come with clear instructions and mounting hardware, allowing homeowners and professionals to easily install them in their desired locations. The compact design ensures that they can fit seamlessly into a variety of interiors.

Overall, the BRK Electronics 4120SB and 4120AC represent robust solutions for smoke detection. Their integration of advanced photoelectric technology, user-friendly features, and essential safety mechanisms make them essential components of any fire safety strategy, ensuring that homes and businesses are better protected against the threat of fire. Investing in these smoke alarms not only meets safety regulations but also fosters a proactive approach to fire safety that can save lives.
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