Introducción
This manual provides essential information for the installation, operation, and maintenance of your First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup. This device is designed to provide early warning of smoke and fire hazards in residential environments. It features Precision Detection advanced sensing technology and the ability to interconnect with compatible alarms for whole-home coverage.
Información importante de seguridad
- ADVERTENCIA: Turn off power at the circuit breaker before installing or servicing the alarm. Failure to do so may result in electrical shock or injury.
- DO NOT PAINT: Painting the alarm may interfere with its ability to detect smoke.
- Test the smoke alarm weekly to ensure proper operation.
- Never disconnect the alarm to silence it. Use the Test/Silence button.
- Replace the alarm unit at least every 10 years from the date of manufacture.
Contenido del paquete
Verifique que todos los componentes estén presentes antes de comenzar la instalación:
- First Alert SMI100-AC Smoke Alarm Unit
- Soporte de montaje
- Quick Connect Plug with wiring harness
- Batería alcalina de 9 V
- Tornillos y anclajes de montaje

Image: Components of the First Alert SMI100-AC smoke alarm, showing the main unit, mounting ring, wiring harness, battery, and screws.
Instalación
Proper placement and installation are crucial for effective smoke detection.
Colocación recomendada
Install smoke alarms on every level of your home, including basements and in every bedroom. For optimal protection, place alarms in hallways outside sleeping areas and in living rooms. Avoid placing alarms in kitchens, bathrooms, or garages where steam, cooking fumes, or exhaust can cause nuisance alarms.

Image: A diagram showing recommended locations for smoke alarms, carbon monoxide alarms, and fire extinguishers throughout a typical house layout, including bedrooms, hallways, living room, kitchen, basement, and garage.
Instrucciones de cableado
- Apague la energía: Before installation, ensure the power to the circuit where the alarm will be installed is turned off at the main fuse box or circuit breaker.
- Soporte de montaje: Secure the mounting bracket to the electrical box using the provided screws. Ensure the bracket is firmly attached.
- Conectar el cableado: Connect the Quick Connect Plug wiring harness to your household wiring. Typically, this involves connecting black to black (hot), white to white (neutral), and orange to orange (interconnect, if applicable). Use wire nuts to secure connections.
- Instale la batería: Open the battery compartment on the back of the smoke alarm unit. Insert the 9V alkaline battery, ensuring correct polarity (+ to + and - to -). Close the battery compartment.
- Conecte la unidad de alarma: Plug the Quick Connect Plug into the receptacle on the back of the smoke alarm unit. Align the alarm unit with the mounting bracket and twist clockwise until it locks securely into place.
- Restaurar energía: Turn the power back on at the circuit breaker. The green power indicator light on the alarm should illuminate, indicating it is receiving AC power.
- Alarma de prueba: Press and hold the Test/Silence button for a few seconds until the alarm sounds. This confirms the unit is functioning correctly.

Image: A close-up of the First Alert SMI100-AC smoke alarm unit, emphasizing the Quick Connect Plug feature for simplified installation.
Operación
Prueba de la alarma
Test your smoke alarm weekly to ensure it is operating correctly. Press and hold the Test/Silence button on the alarm cover until the alarm sounds. The alarm will emit a loud, pulsating sound. If the alarm does not sound, refer to the Troubleshooting section.
Característica de silencio
If a nuisance alarm occurs (e.g., from cooking smoke), you can temporarily silence the alarm by pressing the Test/Silence button. The alarm will remain silent for approximately 10 minutes before resetting. If the smoke is still present after the silence period, the alarm will sound again.
Interconnect Feature
When one interconnected alarm detects smoke, all compatible interconnected alarms in your home will sound. This provides an early warning system throughout your residence.
Luces indicadoras
- LED verde: Indicates AC power is present. It will flash periodically during normal operation.
- LED rojo: Flashes rapidly during an alarm condition. It will also flash during the test sequence.

Imagen: Un detalle view of the First Alert SMI100-AC smoke alarm's front, highlighting the Test/Silence button and the power indicator light.
Mantenimiento
Limpiar su detector de humo
Clean your smoke alarm regularly to prevent dust and debris from interfering with its operation. Use a soft brush attachment on your vacuum cleaner to gently remove dust from the alarm's vents. Do not use cleaning solvents or spray directly onto the alarm.
Reemplazo de batería
La batería de 9 V proporciona energía de respaldo durante nuestrotages. Replace the battery annually, or immediately if the alarm emits a low battery chirp. To replace the battery:
- Turn off AC power to the alarm at the circuit breaker.
- Gire la alarma en sentido antihorario para quitarla del soporte de montaje.
- Abra el compartimiento de la batería y retire la batería vieja.
- Insert a new 9V alkaline battery, observing polarity.
- Cierre el compartimiento de la batería y vuelva a colocar la alarma en el soporte de montaje girándola en el sentido de las agujas del reloj.
- Restore AC power and test the alarm.
Reemplazo al final de la vida útil
Smoke alarms have a limited lifespan. This First Alert SMI100-AC alarm should be replaced 10 years after its manufacture date. The manufacture date is printed on the back of the alarm unit.
Solución de problemas
| Problema | Posible causa | Solución |
|---|---|---|
| La alarma suena de forma intermitente o sin motivo aparente. | Nuisance alarm from cooking, steam, or dust. | Press the Test/Silence button. Clean the alarm. Relocate if consistently triggered by non-fire sources. |
| La alarma suena cada 30-60 segundos. | Batería baja. | Reemplace la batería de 9 V inmediatamente. |
| La alarma no suena durante la prueba. | No AC power, dead battery, or faulty unit. | Check circuit breaker. Ensure battery is installed correctly and is fresh. Replace the unit if issues persist. |
| El LED verde está apagado. | Sin alimentación de CA. | Verifique el disyuntor y las conexiones del cableado. |
Presupuesto
- Modelo: SMI100-AC
- Fuente de energía: 120V AC, 60Hz, with 9V Alkaline Battery Backup
- Tipo de sensor: Ionización
- Tipo de alarma: Detector de humo
- Interconexión: Hardwire interconnect with compatible alarms
- Dimensiones: 5.6" de profundidad x 5.6" de ancho x 1" de alto
- Peso: Aproximadamente 9.6 onzas
- Temperatura de funcionamiento: 40 °F (4.4 °C) a 100 °F (37.8 °C)
- Humedad de funcionamiento: Del 10 % al 95 % de humedad relativa (RH) sin condensación
Garantía y soporte
For warranty information and technical support, please refer to the documentation included with your product or visit the official First Alert webSitio. Conserve su recibo de compra como comprobante para reclamaciones de garantía.
Soporte en línea: www.firstalert.com





