1. Introduction
The First Alert BRK 9120LBL is a hardwired smoke detector designed to provide early warning of smoke and fast-flaming fires. This unit features an ionization sensor and includes a 10-year sealed battery backup, ensuring continuous operation even during power outages. Adapter plugs are provided for easy replacement of existing hardwired alarms without requiring rewiring. This manual provides essential information for proper installation, operation, and maintenance to ensure optimal performance and safety.
Image 1: Front view of the First Alert BRK 9120LBL Hardwired Smoke Detector.
2. Important Safety Information
Please read and understand all instructions before installing and operating this smoke detector. Failure to follow these instructions may result in property damage, injury, or death.
- WARNING: Turn off power at the circuit breaker before beginning installation or maintenance.
- Do not paint the smoke detector. Paint can clog the sensing chambers and prevent the alarm from operating correctly.
- Test the smoke detector weekly to ensure proper function.
- This smoke detector is designed for use in single-family residences.
- Replace the unit immediately if it is damaged or not functioning properly.
For additional safety information, refer to local building codes and fire safety guidelines.
3. Package Contents
Verify that all items are included in your package:
- First Alert BRK 9120LBL Smoke Detector
- Mounting Bracket
- Adapter Plugs (various types for compatibility)
- Mounting Screws and Anchors
- Instruction Manual (this document)
Image 2: All components included with the First Alert BRK 9120LBL smoke detector.
4. Installation
Proper placement and installation are crucial for the effective operation of your smoke detector. Follow these steps carefully.
4.1 Recommended Placement
Install smoke alarms on every level of your home, including the basement, and in every bedroom. For optimal protection, place alarms in hallways outside sleeping areas and in living rooms.
Video 1: This video illustrates recommended placement for smoke alarms and other fire safety devices within a home.
4.2 Wiring and Mounting
- Turn Off Power: Before starting, ensure the power to the circuit where you are installing the alarm is turned off at the main electrical panel.
- Remove Old Alarm (if applicable): If replacing an existing alarm, carefully disconnect it from the wiring and remove its mounting bracket.
- Attach Mounting Bracket: Secure the new mounting bracket to the ceiling or wall using the provided screws and anchors. Ensure it is firmly attached.
- Connect Wiring: Use the appropriate adapter plug to connect the smoke detector to your home's electrical wiring. Match the wire colors (typically black to black, white to white, and orange/red for interconnect if applicable). The adapter plugs are designed for easy replacement without rewiring.
- Activate Battery Backup: The unit comes with a 10-year sealed lithium battery. Ensure the battery is activated by pulling the tab or following the instructions on the unit.
- Attach Smoke Detector: Align the smoke detector with the mounting bracket and twist clockwise until it locks securely into place.
- Restore Power: Turn the power back on at the circuit breaker.
- Test the Alarm: Press and hold the Test/Silence button until the alarm sounds. This confirms the unit is receiving power and functioning correctly.
Image 3: A person installing the smoke detector mounting bracket on a ceiling.
Image 4: The back of the smoke detector showing the wiring connections and adapter plug interface.
Video 2: This video provides a general overview of the First Alert 9120LBL smoke alarm, including its quick connect plug and battery backup features.
5. Operation
The First Alert BRK 9120LBL smoke detector is designed for simple operation and clear alerts.
5.1 Test/Silence Button
The large button on the front of the alarm serves two primary functions:
- Test: Press and hold the button to test the alarm's electronic circuitry, horn, and battery. The alarm will sound if functioning correctly.
- Silence: In case of a nuisance alarm (e.g., from cooking smoke), press the button to temporarily silence the alarm for several minutes. The alarm will automatically reset after the silence period if the smoke has cleared.
Image 5: The smoke detector highlighting the 10-year battery backup and the Test/Silence button.
5.2 Alarm Indicators
The alarm uses both audible and visual indicators:
- Alarm Sound: A loud, 85-decibel alarm will sound in the presence of smoke. If interconnected with other compatible alarms, all connected alarms will sound.
- LED Indicator: A red LED light indicates the status of the alarm (e.g., normal operation, alarm, low battery, malfunction). Refer to the detailed signal patterns in the full user manual for specific meanings.
6. Maintenance
Regular maintenance ensures your smoke detector remains in optimal working condition.
6.1 Weekly Testing
Test your smoke detector at least once a week by pressing and holding the Test/Silence button until the alarm sounds. If the alarm does not sound, refer to the Troubleshooting section.
6.2 Cleaning
Clean your smoke detector at least once a month. Use a soft brush or vacuum cleaner attachment to remove dust and debris from the vents. Do not use water or cleaning solvents.
6.3 10-Year Sealed Battery
This smoke detector is equipped with a 10-year sealed lithium battery that does not require replacement for the life of the alarm. When the battery reaches the end of its life, the unit will emit an end-of-life signal (a specific chirp pattern) indicating it's time to replace the entire smoke detector.
7. Troubleshooting
If your smoke detector is not functioning as expected, consult the following common issues:
| Problem | Possible Cause | Solution |
|---|---|---|
| Alarm sounds intermittently (chirping) | End-of-life signal | Replace the entire smoke detector unit. |
| Alarm sounds without smoke | Nuisance alarm (cooking smoke, steam, dust) | Press the Test/Silence button. Ventilate the area. Clean the alarm. |
| Alarm does not sound during test | No power, unit malfunction | Ensure power is on. Check wiring connections. Replace the unit if still unresponsive. |
For persistent issues, contact customer support.
8. Specifications
- Model: 9120LBL
- Power Source: Hardwired (120V AC) with 10-Year Sealed Lithium Battery Backup
- Sensor Type: Ionization
- Alarm Loudness: 85 dB at 10 feet
- Product Dimensions: 5.58"D x 5.58"W x 1.99"H
- Item Weight: 0.61 Pounds (approx. 9.8 ounces)
- Color: White
- Material: Plastic
- UL Certified: Yes
Image 6: Diagram showing the dimensions of the smoke detector.
9. Warranty
This First Alert BRK 9120LBL smoke detector comes with a limited 10-year warranty. For detailed warranty terms and conditions, please refer to the warranty information provided with your product packaging or visit the official First Alert website.
10. Customer Support
If you have any questions or require assistance with your First Alert BRK 9120LBL smoke detector, please contact First Alert customer support. Contact information can typically be found on the product packaging or the official First Alert website.
