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USER’S MANUAL
SMOKE ALARM
AC POWERED WITH 10-YEAR BATTERY BACKUP
Model SMI105-AC
IMPORTANT! PLEASE READ CAREFULLY AND SAVE.
The warnings/limitations card and manual contains important 
information about your Smoke Alarm’s operation. If you are 
installing this Alarm for use by others, you must leave this 
manual—or a copy of it—with the end user.
Para el manual del usuario en español, por favor 
visite rstalert.com
 DANGER!
ELECTRICAL SHOCK HAZARD. Turn off the power to the area where the Smoke Alarm is 
installed before removing it from the mounting bracket. Failure to turn off the power 
rst may result in serious electrical shock, injury or death.
! WARNING!
•  This unit will not alert hearing impaired residents. It is recommended that you 
install special units which use devices like ashing strobe lights to alert hearing 
impaired residents.
•  Installation of this unit must conform to the electrical codes in your area; Articles 210 
and 300.3 (B) of NFPA 70 (NEC), NFPA 72, NFPA 101; ICC; SBC (SBCCI); UBC (ICBO); NBC 
(BOCA); OTFDC (CABO), and any other local or building codes that may apply. Wiring and 
installation must be performed by a licensed electrician. Failure to follow these guidelines 
may result in injury or property damage.
•  This unit must be powered by a 24-hour, 120V AC pure sine wave 60 Hz circuit. Be sure 
the circuit cannot be turned off by a switch, dimmer, or ground fault circuit interrupter. 
Failure to connect this unit to a 24-hour circuit may prevent it from providing constant 
protection. Unit may be connected to an arc fault circuit interrupter.
•  This Smoke Alarm must have AC or battery power to operate. If the AC power fails, battery 
back-up will allow the Alarm to sound for at least 4 minutes. If AC power fails and the 
battery is weak, protection should last for up to 7 days. If AC power fails and the battery is 
dead or missing, the Alarm cannot operate.
•  Never disconnect the power from an AC powered unit to stop an unwanted Alarm. Doing 
so will disable the unit and remove your protection. In the case of a true unwanted Alarm 
open a window or fan the smoke away from the unit. The Alarm will reset automatically 
when it returns to normal operation.
•  Never remove the batteries from a battery operated unit to stop an unwanted Alarm 
(caused by cooking smoke, etc.). Instead open a window or fan the smoke away from the 
unit. The Alarm will reset automatically.
! CAUTION!
•  Connect this unit ONLY to other compatible units. See “How To Install This Smoke Alarm” 
for details. Do not connect it to any other type of Alarm or auxiliary device. Connecting 
anything else to this unit may damage it or prevent it from operating properly.
•  The battery compartment resists closing unless a battery is installed. This warns you the 
unit will not operate under DC power without a battery.
•  Do not paint over the unit. Paint may clog the openings to the sensing chamber and 
prevent the unit from operating properly.
01
  INTRODUCTION
Thank you for choosing First Alert
®
 for your Smoke Alarm needs. You have purchased a state-of-the-
art Smoke Alarm designed to provide you with early warning of a re. Please take the time to read this 
manual and make the Smoke Alarm an integral part of your family’s safety plan.
BASIC SAFETY INFORMATION
IMPORTANT!
•  Dangers, Warnings, and Cautions alert you to important operating instructions or to potentially 
hazardous situations. Pay special attention to these items.
•  This Smoke Alarm is approved for use in single-family residences. It is   designed for NOT
marine or RV use.
! CAUTION!
•  The Smoke Alarm will only indicate the presence of smoke that reaches the sensor.
•  The Smoke Alarm is not designed to sense gas, heat or ames.
! WARNING!
•  This Smoke Alarm cannot operate without working batteries. Removing the batteries for any 
reason, removes your protection.
•  ignore any Alarm. See “If Your Smoke Alarm Sounds” for more information on how to NEVER 
respond to an Alarm. Failure to respond can result in injury or death.
•  The Silence Features are for your convenience only and will not correct a problem. See “Using the 
Silence Features” for details. Always check your home for a potential problem after any Alarm. 
Failure to do so can result in injury or death.
•  Test this Smoke Alarm once a week. If the Alarm ever fails to test correctly, have it replaced 
immediately! If the Alarm is not working properly, it cannot alert you to a problem.
02
  ABOUT SMOKE ALARMS
TYPES OF ALARMS
All these Smoke Alarms are designed to provide early warning of res if located, installed and cared 
for as described in the user’s manual, and if smoke reaches the Alarm. If you are unsure which type of 
Smoke Alarm to install, refer the National Fire Protection Association (NFPA) Standard 72 (National Fire 
Alarm and Signaling Code) and NFPA 101 (Life Safety Code). National Fire Protection Association, One 
Batterymarch Park, Quincy, MA 02269-9101. Local building codes may also require specic units in 
new construction or in different areas of the home.
Battery (DC) operated Smoke Alarms: Provide protection even when electricity fails, provided the 
batteries are fresh and correctly installed. Units are easy to install, and do not require professional 
installation. They do not, however, provide interconnected functionality.
AC powered Smoke Alarms: Can be interconnected so if one unit senses smoke, all units Alarm. 
They do not operate if electricity fails.
AC with battery (DC) back-up: will operate if electricity fails, provided the batteries are fresh and 
correctly installed. AC and AC/DC units must be installed by a qualied electrician.
Wireless Interconnected Alarms: Offer the same interconnected functionality as with hardwired 
Alarms, without wires. Units are easy to install and do not require professional installation. They 
provide protection even when electricity fails, provided the batteries are fresh and correctly installed.
Smoke Alarms for solar or wind energy users and battery backup power systems: AC powered 
Smoke Alarms should only be operated with true or pure sine wave inverters. Operating this Smoke 
Alarm with most batterypowered UPS (uninterruptible power supply) products or square wave or 
“quasi sine wave” inverters   If you are not sure about your inverter or UPS will damage the Alarm.
type, please consult with the manufacturer to verify.
Smoke Alarms for the hearing impaired: Special purpose Smoke Alarms should be installed for the 
hearing impaired. They include a visual Alarm and an audible Alarm horn, and meet the requirements 
of the Americans With Disabilities Act. These units can be interconnected so if one unit senses smoke, 
all units Alarm.
Smoke Alarms are not to be used with detector guards unless the combination has been evaluated 
and found suitable for that purpose.
All First Alert
®
 Smoke Alarms conform to regulatory requirements, including UL217 and are 
designed to detect particles of combustion. Smoke particles of varying number and size are 
produced in all res.
Ionization technology is generally more sensitive than photoelectric technology at 
detecting small particles, which tend to be produced in greater amounts by aming res, 
which consume combustible materials rapidly and spread quickly. Sources of these res 
may include paper burning in a wastebasket, or a grease re in the kitchen.
Photoelectric technology is generally more sensitive than ionization technology at 
detecting large particles, which tend to be produced in greater amounts by smoldering 
res, which may smolder for hours before bursting into ame. Sources of these res may 
include cigarettes burning in couches or bedding.
For maximum protection, use both types of Smoke Alarms on each level and in every 
bedroom of your home.
03
  INSTALLATION
BEFORE YOU INSTALL THIS SMOKE ALARM
IMPORTANT!
Read “Recommended Locations for Smoke Alarms” and “Locations to Avoid for Smoke Alarms” 
before beginning. This unit monitors the air, and when smoke reaches its sensing chamber, it Alarms. 
It can give you more time to escape before re spreads. This unit can ONLY give an early warning 
of developing res if it is installed, maintained and located where smoke can reach it, and where all 
residents can hear it, as described in this manual. This unit will not sense gas, heat, or ame. It cannot 
prevent or extinguish res.
WHERE TO INSTALL THIS ALARM
The National Fire Protection Association (NFPA), recommends one Smoke Alarm on every oor, in every 
sleeping area, and in every bedroom. In new construction, the Smoke Alarms must be AC powered and 
interconnected. See “Agency Placement Recommendations” for details. For additional coverage, it is 
recommended that you install a Smoke Alarm in all rooms, halls, storage areas, nished attics, and 
basements, where temperatures normally remain between 40˚ F (4.4˚ C) and 100˚ F (37.8˚ C). Make 
sure no door or other obstruction could keep smoke from reaching the Smoke Alarms.
IN GENERAL, INSTALL SMOKE ALARMS:
•  On every level of your home, including nished attics and basements.
•  Inside every bedroom, especially if people sleep with doors closed.
•  In the hall near every sleeping area. If your home has multiple sleeping areas, install a unit in each. 
If a hall is over 40 feet (12 meters) long, install an Alarm at each end.
•  At the top of the rst-to-second level stairway, and at bottom of basement stairway.
IMPORTANT!
Specic requirements for Smoke Alarm installation vary from state to state and from region to region. 
Check with your local Fire Department for current requirements in your area. It is recommended AC 
or AC/DC units be interconnected for added protection.
RECOMMENDED PLACEMENT:
Smoke Alarm 
One on every level and 
in every bedroom
Carbon Monoxide Alarm 
One on every level and 
in every bedroom
Fire Extinguisher 
One on every level, plus 
kitchen and garage
•  When installing on the wall, the top edge of Smoke Alarms should be placed between 4 inches 
(102 mm) and 12 inches (305 mm) from the wall/ceiling line.
•  When installing on the ceiling, place the Alarm as close to the center as possible.
•  In either case, install at least 4 inches (102 mm) from where the wall and ceiling meet.
NOTE: For any location, make sure no door or other obstruction could keep carbon monoxide or smoke 
from reaching the Alarm.
WHERE NOT TO INSTALL THIS ALARM
FOR BEST PERFORMANCE, IT IS RECOMMENDED YOU AVOID INSTALLING SMOKE ALARMS 
IN THESE AREAS:
•  Where combustion particles are produced. Combustion particles form when something burns. 
Areas to avoid include poorly ventilated kitchens, garages, and furnace rooms. Keep units at 
least 20 feet (6 meters) from the sources of combustion particles (stove, furnace, water heater, 
space heater) if possible. In areas where a 20-foot (6 meter) distance is not possible – in modular, 
mobile, or smaller homes, for example – it is recommended the Smoke Alarm be placed as far 
from these fuel-burning sources as possible. The placement recommendations are intended 
to keep these Alarms at a reasonable distance from a fuel-burning source, and thus reduce 
“unwanted” Alarms. Unwanted Alarms can occur if a Smoke Alarm is placed directly next to a 
fuel-burning source. Ventilate these areas as much as possible.
•  In air streams near kitchens. Air currents can draw cooking smoke into the sensing chamber of a 
Smoke Alarm near the kitchen.
•  In very damp, humid or steamy areas, or directly near bathrooms with showers. Keep units at least 
10 feet (3 meters) away from showers, saunas, dishwashers, etc.
•  Where the temperatures are regularly below 40˚ F (4.4˚ C) or above 100˚ F (37.8˚ C) including 
unheated buildings, outdoor rooms, porches, or unnished attics or basements.
•  In very dusty, dirty, or greasy areas. Do not install a Smoke Alarm directly over the stove or range. 
Clean a laundry room unit frequently to keep it free of dust or lint.
•  Near fresh air vents, ceiling fans, or in very drafty areas. Drafts can blow smoke away from the 
unit, preventing it from reaching sensing chamber.
•  In insect infested areas. Insects can clog openings to the sensing chamber and cause 
unwanted Alarms.
•  Less than 12 inches (305 mm) away from uorescent lights. Electrical “noise” can interfere 
with the sensor.
•  In “dead air” spaces.
AVOIDING DEAD AIR SPACES
“Dead air” spaces may prevent smoke from reaching the Smoke Alarm. To avoid dead air spaces, 
follow installation recommendations below.
On ceilings, install Smoke Alarms as close to the center of the ceiling as possible. If this is not possible, 
install the Smoke Alarm at least 4 inches (102 mm) from the wall or corner.
For wall mounting (if allowed by building codes), the top edge of Smoke Alarms should be placed 
between 4 inches (102 mm) and 12 inches (305 mm) from the wall/ceiling line, below typical 
“dead air” spaces.
On a peaked, gabled, or cathedral ceiling, install rst Smoke Alarm within 3 feet (0.9 meters) of the 
peak of the ceiling, measured horizontally. Additional Smoke Alarms may be required depending on 
the length, angle, etc. of the ceiling’s slope. Refer to NFPA 72 for details on requirements for sloped or 
peaked ceilings.
HOW TO INSTALL THIS ALARM
IMPORTANT!
This Smoke Alarm is designed to be mounted on any standard wiring junction box up to a 4-inch (10 cm) size, 
on either the ceiling or wall (if allowed by local codes). Read “Where to Install This Alarm” and “Where This 
Alarm Should Not Be Installed” before you begin installation.
Tools you will need: needle-nose pliers or utility knife, standard athead screwdriver, wire strippers 
(for interconnected Alarms)
! WARNING!
Make sure the Alarm is not receiving excessively noisy power. Examples of noisy power could 
be major appliances on the same circuit, power from a generator or solar power, light dimmer 
on the same circuit or mounted near uorescent lighting. Excessively noisy power may cause 
damage to your Alarm.
THE PARTS OF THIS ALARM
The Mounting Bracket: To remove the mounting bracket from the Smoke Alarm base, hold the Smoke 
Alarm base rmly and twist the mounting bracket counterclockwise. The mounting bracket installs 
onto the junction box. It has a variety of screw slots to t most boxes.
The Power Connector: The power connector 
plugs into a power input block on the Alarm. It 
supplies the unit with AC power.
•  The black wire is “hot.”
•  The white wire is neutral.
•  The orange wire is used for interconnect.
If you need to remove the power connector, 
turn  Insert a at  POWER OFF rst.
screwdriver blade between the power 
connector and the security tab inside the 
power input block. Gently pry back the tab 
and pull the connector free.
A
B
C
1
3
6
2
2
3
4
5
7
THE PARTS OF THIS SMOKE ALARM
A
   Smoke LED (RED)
B
   Power LED (GREEN)
C
   Test/Silence button
1
   Mounting Bracket
2
   Mounting Slots
3
   Locking Pins  
(break out of bracket)
4
   Hot (Black) AC Wire
5
   Neutral (White) AC Wire
6
   Interconnect (Orange) Wire
7
   Quick-Connect Power Connector
FOLLOW THESE SIMPLE STEPS 
The basic installation of this Smoke 
Alarm is similar whether you want 
to install one Alarm, or interconnect 
more than one Alarm. If you are 
interconnecting more than one Alarm, 
you   read “Special Requirements MUST
for Interconnected Alarms” below before 
you begin installation.
 DANGER!
ELECTRICAL SHOCK HAZARD. Turn off power to the area where you will install this unit at the 
circuit breaker or fuse box before beginning installation. Failure to turn off the power before 
installation may result in serious electrical shock, injury or death.
! WARNING!
Improper wiring of the power connector or the wiring leading to the power connector will cause 
damage to the Alarm and may lead to a non-functioning Alarm. All power connections should be done 
using wire-nuts.
STAND-ALONE ALARM ONLY:
•  Connect the white wire on the power connector to the neutral wire in the junction box.
•  Connect the black wire on the power connector to the hot wire in the junction box.
•  Tuck the orange wire inside the junction box. It is used for interconnect only.
INTERCONNECTED UNITS ONLY:
Strip off about 1/2" (12 mm) of the plastic coating on the orange wire on the 
power connector.
•  Connect the white wire on the power connector to the neutral wire in the junction box.
•  Connect the black wire on the power connector to the hot wire in the junction box.
•  Connect the orange wire on the power connector to the interconnect wire in the junction 
box. Repeat for each unit you are interconnecting. Never connect the hot or neutral wires 
in the junction box to the orange interconnect wire. Never cross hot and neutral wires 
between Alarms.
1.  Remove the mounting bracket from the base, and attach it to the junction box.
2.  Using wire nuts, connect the power connector to the household wiring.
3.  If there’s a battery pull tab, activate the battery back-up by removing the “Pull to Activate Battery 
Back-Up” tab. You do no need to open the battery compartment during installation. If battery is not 
installed, install battery back-up. Battery back-up cannot work until you install the battery in the 
correct position (Match “+” to “+” and “-” to “-”).
4.  Plug the power connector into the back of the Alarm.
5.  Position the base of the Alarm over the mounting bracket, and turn the Alarm clockwise (right) until 
the unit is in place. If wall mounted, adjust unit so words are level.
6.  Check all connections.
STAND-ALONE ALARM ONLY:
•  If you are only installing one Alarm, restore power to the junction box.
INTERCONNECTED UNITS ONLY:
•  If you are interconnecting multiple Alarms, repeat steps 1-6 for each Alarm in the series. 
When you are nished, restore power to the junction box.
 DANGER!
ELECTRICAL SHOCK HAZARD. Do not restore power until all Smoke Alarms are completely 
installed. Restoring power before installation is complete may result in serious electrical 
shock, injury or death.
7.  Turn AC power back on. Under normal operation, the Green power indicator light will 
shine continuously.
8.  If the Green power indicator light does not light,   and TURN OFF POWER TO THE JUNCTION BOX
recheck all connections. If all connections are correct and the Green power indicator still does not 
light when you restore the power, the unit should be replaced immediately.
9.  Single Station Alarms: Test each Alarm. Press and release the Test/Silence button. The unit will 
chirp and then Alarm.  
Interconnected Alarms: Press and release the Test/Silence button. The unit will chirp and 
then Alarm. All interconnected Alarms should sound. The other Alarms sounding only tests the 
interconnect signal between Alarms. It does not test each Alarm’s operation. You must test 
each Alarm individually to check if the Alarm is functioning properly.
 DANGER!
If any unit in the series does not Alarm, TURN OFF POWER and recheck connections. If it does 
not Alarm when you restore power, replace it immediately.
SPECIAL REQUIREMENTS FOR INTERCONNECTED ALARMS
! WARNING!
•  Failure to meet any of the above requirements could damage the units and cause them to 
malfunction, removing your protection.
•  AC and AC/DC Smoke Alarms can be interconnected. Under AC power, all units will Alarm when 
one senses smoke. When power is interrupted, only the AC/DC units in the series will continue to 
send and receive signals. AC powered Smoke Alarms will not operate.
Interconnected units can provide earlier warning of re than stand-alone units, especially if a re 
starts in a remote area of the dwelling. If any unit in the series senses smoke, all units will Alarm. To 
determine which Alarm initiated an Alarm, see table:
During an Alarm
On Initiating Alarm(s): Red LED(s) ashes (ash) 
rapidly in sync with horn
On All Other Alarms: Green LED(s) Normal,  
Red LED(s) Off
After an Alarm (Latching)
On Initiating Alarm(s): Red LED(s) On for 2 seconds/
Off for 2 seconds
On All Other Alarms: Green LED(s) Normal,  
Red LED(s) Off
COMPATIBLE INTERCONNECTED UNITS
IMPORTANT!
Interconnect units within a single family residence only. Otherwise all households will experience 
unwanted Alarms when you test any unit in the series. Interconnected units will only work if they are 
wired to compatible units and all requirements are met. This unit is designed to be compatible with: 
First Alert Smoke and Smoke/CO Alarms Models SMI100-AC, SMI105-AC, SMICO100-AC,  
SMICO105-AC, SA520, SM100V-AC, SMCO100V-AC, SM300-AC, SM500-AC, 1039102,7030BSL, 
SMI110LED-AC, SMICO110LED-AC and BRK Smoke Alarm Models 3120B, 9120, 9120B, SC9120B, 
7010, 7010B, 7010BSL, 7020B, 7020BSL, SC7010B, SC7010BV; BRK Heat Alarm Model HD6135FB;  
BRK Auxiliary Devices Models RM4 (Relay Module).
INTERCONNECTED UNITS MUST MEET ALL OF THE FOLLOWING REQUIREMENTS:
•  A maximum of 18 compatible units may be interconnected (Maximum of 12 Smoke Alarms).
•  The same fuse or circuit breaker must power all interconnected units.
•  The total length of wire interconnecting the units should be less than 1000 feet (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/or your local building code for further connection requirements.
BA
6
7
8
1
1
2
2
4
5
3
3
4
5
A
  Unswitched 120VAC 60 Hz source
B
   To additional units; Maximum =  
18 total (Maximum 12 Smoke Alarms)
1
  Alarm
2
  Ceiling or Wall
3
  Power Connector
4
  Wire Nut
5
  Junction Box
6
  Neutral Wire (White)
7
   Interconnect Wire 
(Orange)
8
  Hot Wire (Black)
Action What You Will See & Hear
Normal Operations
Horn: Power LED: Silent;   Steady 
Green;   OffSmoke LED:
AC Power to Alarm is Off
Horn: Power LED: Silent;   Flashes Green every 
minute;   OffSmoke LED:
When You Test the Alarm
Horn: Short “chirp”, then 3 beeps, pause, 3 beeps; 
Power LED: Green if AC power to Alarm is On; 
Smoke LED: Flashes Red in sync with horn
Alarm has reached  
Low Battery/End of Life
If AC power to Alarm is on OR rst 15 minutes after AC 
power is removed 
Horn: Chirps 5 time every minute;  
Power LED: Flashes Green 2 seconds on/2 seconds off;  
Smoke LED: Off
After rst 15 minutes if AC power to Alarm is Off
Horn: Chirps 5 times every minute;   Flashes Power LED:  
Green 5 times every minute;   OffSmoke LED:
Low Battery/End of Life 
Signal is Silenced
Horn: Power  Silent (for up to 2 days, 14 days total); 
LED: Steady Green (AC power) or 5 Green ashes (on 
battery backup);   OffSmoke LED:
Alarm is Not Operating Properly 
(Malfunction Signal)
Horn: Power LED: 3 chirps every minute;   Flashes 
Green 3 times every minute;   OffSmoke LED:
Smoke is Detected
Horn: 3 beeps, pause, 3 beeps;   Constant Power LED:
Green (AC power), Off (on battery backup); Smoke/
CO LED: During Alarm:   Flashes Red in sync with 
the horn pattern.   Flashes Red On for 2 After Alarm:
seconds/Off for 2 seconds. Smoke Alarm Latch is now 
engaged (See Latching Features section for details)
Smoke is Detected in Another 
Interconnected Alarm
Horn: 3 beeps, pause, 3 beeps;   Power LED:
Steady Green (AC power), Off (on battery 
backup);   OffSmoke LED:
Smoke Alarm is Silenced 
(up to 15 Minutes)
Horn: Power LED: Off;   Steady Green if AC power to 
Alarm is On, Flash 1 time every minute if Alarm is 
operating on battery backup;   Flashes Smoke LED:
Red 3 times, pause, 3 times
NOTE: Without AC Power and running on battery only, Low Battery Latch or Alarm Latch are 
only engaged for about 15 minutes to conserve power. Low Battery Latch and Alarm Latch do 
not operation with a missing battery and no AC power.
04
  ALARM FEATURES
•  Add protection in minutes.Easy Installation: 
•  10 Year Battery Backup: For protection during power outages.
•  Identies unit that initiated Alarm.Alarm Indicator: 
LATCHING FEATURES
Alarm Latch is activated after an Alarm is exposed to Alarm levels of smoke. This feature will 
only work with AC power. See “Special Requirements for Interconnected Alarms” for signaling.
This feature helps emergency responders, investigators, or service technicians identify which 
unit(s) in your home were exposed to Alarm levels of smoke. This can help investigators 
pinpoint the source of smoke. 
Interconnected Alarms. Latching Alarm Indicator shows which Alarm(s) in the series were 
exposed to Alarm levels of smoke. The Latching Alarm Indicator stays ON until you clear it, 
so it can alert you to an Alarm that occurred while you were away from home, even though 
smoke present in the air has dropped below Alarm levels.
Latching Alarm 
Unit was exposed to 
Alarm levels of Smoke
Latching Not Activated 
Unit was not exposed to 
Alarm levels of Smoke
Low Battery Latch is activated when the Alarm is in the “low battery condition”. When this 
occurs, the Green LED ashes 2 seconds on, 2 seconds off. This feature is designed to help 
you identify which Alarm needs to be replaced.
OPTIONAL LOCKING FEATURE
The optional locking feature is designed to discourage unauthorized removal of the Alarm. It is 
not necessary to activate the locks in single-family households where unauthorized removal 
is not a concern.
Locking Pin
Tools you will need: Needle-nose pliers or 
utility knife, standard athead screwdriver
The locking feature uses a locking pin, 
which is molded into the mounting bracket. 
Using needle nose pliers or a utility knife, 
remove the pin from the mounting bracket.
TO LOCK THE MOUNTING BRACKET
1.  Using needle-nose pliers 
or utility knife, detach 
one locking pin from 
mounting bracket.
2.  Insert the locking pin into the 
lock located on the base as 
shown in the diagram.
3.  When you attach the Smoke 
Alarm to the mounting 
bracket, the locking pin’s 
head will t into a notch 
on the bracket.
TO UNLOCK THE MOUNTING BRACKET
 DANGER!
ELECTRICAL SHOCK HAZARD. Turn off the power to the area where the Alarm is 
installed before removing it from the mounting bracket. Failure to turn off the power 
rst may result in serious electrical shock, injury or death.
1.  Insert a athead screwdriver 
between the mounting bracket 
pin and the mounting bracket.
2.  Pry the Alarm away from 
the bracket by turning both 
the screwdriver and the 
Alarm counterclockwise (left) 
at the same time.
05
  TESTING & MAINTENANCE
WEEKLY TESTING
! WARNING!
NEVER use an open ame of any kind to test this unit. You might accidentally damage or set re to the 
unit or to your home.
! CAUTION!
DO NOT stand close to the Alarm when the horn is sounding. Exposure at close range may be 
harmful to your hearing. When testing, step away when horn starts sounding.
It is important to test this unit every week to make sure it is working properly. Using the test 
button is the recommended way to test this Smoke Alarm. Press and release the Test/Silence 
button on the cover of the unit. The unit will “chirp” and then Alarm. If it does not Alarm, make sure 
the unit is receiving power and test it again. If it still does not Alarm, replace it immediately. During 
testing, you will hear a loud, repeating horn pattern: 3 beeps, pause, 3 beeps, pause.
When testing a series of interconnected units you must test each unit individually. Make sure all units 
Alarm when each one is tested.
REGULAR MAINTENANCE
This unit has been designed to be as maintenance-free as possible, but there are a few simple things 
you must do to keep it working properly:
•  Test it at least once a week.
•  Clean the Smoke Alarm at least once a month; gently vacuum the outside of the Smoke Alarm 
using your household vacuum’s soft brush attachment. Test the Smoke Alarm. Never use water, 
cleaners or solvents since they may damage the unit.
•  If the green power LED ashes 2 times every minute (horn is silent) it means that the Alarm needs 
to be cleaned as indicated above. If green LED continues to ash, please call Consumer Support.
•  If the Smoke Alarm becomes contaminated by excessive dirt, dust and/or grime, and cannot be 
cleaned to avoid unwanted Alarms, replace the unit immediately.
•  Relocate the unit if it sounds frequent unwanted Alarms. See “Locations To Avoid For Smoke 
Alarms” for details.
•  When the battery back-up becomes weak, the Smoke Alarm will “chirp” about 5 times a minute 
(the low battery warning). This warning should last 7 days, but you should replace the Alarm 
immediately to continue your protection.
•  Protect or cover the alarm when doing any maintenance to home i.e. sanding oors, painting, 
drywall patching, etc. to prevent contamination.
! WARNING!
•  Alarm is supplied with lithium battery (factory locked in battery drawer) that is capable of 
providing backup battery function for the recommended life of the Alarm. At low battery or 
end of life signal, use tool to cut/disengage the locking pin located at side of factory locked 
drawer and properly dispose of lithium battery (reference drawing added) and Alarm. DO NOT 
REPLACE BATTERY.
•  Please dispose of or recycle used batteries properly, following any local regulations. Consult your 
local waste management authority or recycling organization to nd an electronics recycling facility 
in your area. DO NOT DISPOSE OF BATTERIES IN FIRE. BATTERIES MAY EXPLODE OR LEAK.
! WARNING!
•  Keep battery out of reach of children. In the event a battery is swallowed, immediately contact 
your poison control center, your physician, or the National Battery Ingestion hotline at  
202-625-3333 as serious injury may occur.
IMPORTANT!
Actual battery service life depends on the Smoke Alarm 
and the environment in which it is installed. At low battery 
or end of life signal, use tool to cut/disengage the locking 
pin located at side of factory locked drawer and properly 
dispose of lithium battery and Alarm.
TROUBLESHOOTING GUIDE
 DANGER!
ELECTRICAL SHOCK HAZARD. Turn off the power to the area where the Alarm is installed 
BEFORE removing it from the mounting bracket or checking any electrical connections! 
Failure to turn off the power rst may result in electrical shock, injury or death.
IF THE ALARM... PROBLEM... YOU SHOULD...
Green Power light is off. Unit 
will not Alarm when you 
press the Test/Silence button
Unit may not be 
receiving any power.
Check the AC 
power supply. Make 
sure the power 
connector is securely 
attached to the Alarm.
Green Power light ashes On 
every minute (horn is silent). 
Alarm is not 
receiving AC power.
Unit is operating on 
battery backup. Check the 
AC power supply.
Horn “chirps” 5 times every 
minute and Green Power LED 
ashes on for 2 seconds ON/ 
2 seconds OFF (Low battery 
latch is engaged)
Battery is low or missing
Replace Alarm 
immediately. If unit 
is under warranty, 
contact Consumer 
Support to process a 
warranty replacement. 
Horn “chirps” and Green 
Power LED ashes 5 
times every minute
END OF LIFE SIGNAL.  
Alarm needs 
to be replaced.
Replace Alarm immediately
Horn “chirps” and Green 
Power LED ashes 3 
times every minute
MALFUNCTION SIGNAL. 
Device is not working 
properly, and needs 
to be replaced.
If unit is under warranty, 
contact Consumer 
Support to process a 
warranty replacement.
Power LED ashes Green  
2 times every minute
Alarm requires cleaning
Clean Alarm then press and 
release the test button. See 
“Regular Maintenance” 
section. If Green LED 
continues to ash, contact 
Consumer Support.
Alarm goes back into 
Alarm after you press the 
Test/Silence button to 
silence the Alarm
Smoke levels are still 
potentially dangerous
Refer to “If your Smoke 
Alarm Sounds” for 
details on how to 
respond to an Alarm. 
EVACUATE your home 
immediately and call 911.
Smoke Alarm sounds when 
no smoke is visible.
Unwanted Alarm may be 
caused by nonemergency 
source like cooking smoke.
Silence Alarm using test/
silence button. Clean the 
Alarm’s cover with a soft, 
clean cloth. If frequent 
unwanted Alarms continue, 
relocate your Alarm. Alarm 
may be too close to a 
kitchen, cooking appliance 
or steamy bathroom.
If you have questions that cannot be answered by reading this manual, call the  
Consumer Support Team at 1-800-323-9005.
FIRE SAFETY TIPS
Follow safety rules and prevent hazardous situations: 1) Use smoking materials properly. Never smoke 
in bed. 2) Keep matches or lighters away from children; 3) Store ammable materials in proper 
containers; 4) Keep electrical appliances in good condition and don’t overload electrical circuits; 
5) Keep stoves, barbecue grills, replaces and chimneys grease- and debris-free; 6) Never leave 
anything cooking on the stove unattended; 7) Keep portable heaters and open ames, like candles, 
away from ammable materials; 8) Don’t let rubbish accumulate. Keep Alarms clean, and test them 
weekly. Replace Alarms immediately if they are not working properly. Smoke Alarms that do not work 
cannot alert you to a re. Keep at least one working re extinguisher on every level, and an additional 
one in the kitchen. Have re escape ladders or other reliable means of escape from an upper level in 
case stairs are blocked; 9) Have an escape plan and practice it regularly.
06
  IF THIS SMOKE ALARM SOUNDS
RESPONDING TO AN ALARM
During an Alarm, you will hear a loud, repeating horn pattern: 3 beeps, pause, 3 beeps, pause.
! WARNING!
•  If the unit Alarms get everyone out of the house immediately.
•  If the unit Alarms and you are not testing the unit, it is warning you of a potentially dangerous 
situation that requires your immediate attention.   ignore any Alarm. Ignoring the Alarm may NEVER
result in injury or death.
•  Never disconnect the AC power to quiet an unwanted Alarm. Disconnecting the power disables the 
Alarm so it cannot sense smoke. This will remove your protection. Instead open a window or fan 
the smoke away from the unit. The Alarm will reset automatically.
 DANGER!
ELECTRICAL SHOCK HAZARD. Attempting to disconnect the power connector from the unit when 
the power is on may result in electrical shock, serious injury or death.
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.
If the unit Alarms and you are certain that the source of smoke is not a re—cooking smoke or an 
extremely dusty furnace, for example—open a nearby window or door and fan the smoke away from 
the unit. Use the Silence Feature to silence the Alarm. This will silence the Alarm, and once the smoke 
clears the unit will reset itself automatically.
WHAT TO DO IN CASE OF FIRE
•  Don’t panic; stay calm. Follow your family escape plan.
•  Get out of the house as quickly as possible. Don’t stop to get dressed or collect anything.
•  Feel doors with the back of your hand before opening them. If a door is cool, open it slowly. Don’t 
open a hot door. Keep doors and windows closed, unless you must escape through them.
•  Cover your nose and mouth with a cloth (preferably damp). Take short, shallow breaths.
•  Meet at your planned meeting place outside your home, and do a head count to make sure 
everybody got out safely.
•  Call the Fire Department as soon as possible from outside. Give your address, then your name.
•  Never go back inside a burning building for any reason.
•  Contact your Fire Department for ideas on making your home safer.
! WARNING!
Alarms have various limitations. See “General Limitations of Smoke Alarms” for details.
07
  USING THE SILENCE FEATURES
The Silence Feature can temporarily quiet an unwanted Alarm for up to 15 minutes.
! WARNING!
The Silence Feature does not disable the unit—it makes it temporarily less sensitive to smoke. For 
your safety, if smoke around the unit is dense enough to suggest a potentially dangerous situation, 
the unit will stay in Alarm or may re-Alarm quickly. If you do not know the source of the smoke, do 
not assume it is an unwanted Alarm. Not responding to an Alarm can result in property loss, injury, 
or death. If the unit will not silence and no heavy smoke is present, or if it stays in silence mode 
continuously, it should be replaced immediately.
TO SILENCE SMOKE ALARMS IN AN INTERCONNECTED SERIES 
1.  To silence multiple Alarms in an interconnected series, you must press the Test/Silence button on 
the unit(s) that initiated the Alarm.  
NOTE: The red LED on the initiating Alarm will ash 3 times, repeating. The red LED will be Off on 
all other non-initiating Alarms. No audible sound will be heard. The unit will exit “silence mode” in 
approximately 15 minutes.
2.  While the unit is in “silence mode”, pressing and holding the Test/Silence button for approximately 
10 seconds will test the unit. After testing, the unit will re-enter “silence mode” and the 15-minute 
timer is reset.
SILENCING THE LOW BATTERY/END OF LIFE WARNING
This Silence Feature can temporarily quiet the low battery/end of life warning “chirp” for up to 48 hours. 
Press the Test/Silence button on the Alarm cover until you hear the acknowledge “chirp”. Once the low 
battery/end of life warning “chirp” Silence Feature is activated, the unit continues to ash the green light 
5 times every minute for up to 48 hours. Then, the end of life “chirp” will resume. Replace the unit as 
soon as possible, to maintain protection in event of a power outage.
IF YOU SUSPECT A PROBLEM
Smoke Alarms may not operate properly because of a dead or weak battery, a build-up of dirt, dust or 
grease on the Smoke Alarm cover, or installation in an improper location. Clean the Smoke Alarm as 
described in “Regular Maintenance,” and then test the Smoke Alarm again. If it fails to test properly 
when you use the test button, or if the problem persists, replace the Smoke Alarm immediately.
•  If you hear a “chirp” 5 times a minute, replace the Alarm.
•  If you experience frequent non-emergency Alarms (like those caused by cooking smoke), try 
relocating the Smoke Alarm.
•  If the Alarm sounds when no smoke is visible, try cleaning or relocating the Smoke Alarm. The 
cover may be dirty.
•  If the Alarm does not sound during testing, make sure it is receiving AC power from the 
household current.
Do not try xing the Alarm yourself — this will void your warranty!
If the Smoke Alarm is still not operating properly, and it is still under warranty, please see “How to 
Obtain Warranty Service” in the Limited Warranty.
08
   REGULATORY INFORMATION  
FOR SMOKE ALARMS
RECOMMENDED LOCATIONS FOR SMOKE ALARMS
INSTALLING SMOKE ALARMS IN SINGLE-FAMILY RESIDENCES
The National Fire Protection Association (NFPA), recommends one Smoke Alarm on every oor, in every 
sleeping area, and in every bedroom. In new construction, the Smoke Alarms must be AC powered and 
interconnected. See “Agency Placement Recommendations” for details. For additional coverage, it is 
recommended that you install a Smoke Alarm in all rooms, halls, storage areas, nished attics, and 
basements, where temperatures normally remain between 40˚ F (4.4˚ C) and 100˚ F (37.8˚ C). Make 
sure no door or other obstruction could keep smoke from reaching the Smoke Alarms.
MORE SPECIFICALLY, INSTALL SMOKE ALARMS:
•  On every level of your home, including nished attics and basements.
•  Inside every bedroom, especially if people sleep with doors closed.
•  In the hall near every sleeping area. If your home has multiple sleeping areas, install a unit in each.
•  If a hall is over 40 feet (12 meters) long, install an Alarm at each end.
•  At the top of the rst-to-second level stairway, and at bottom of basement stairway.
IMPORTANT!
Specic requirements for Smoke Alarm installation vary from state to state and from region to region. 
Check with your local Fire Department for current requirements in your area. It is recommended AC 
or AC/DC units be interconnected for added protection.
HARDWIREDBATTERY OPERATED & WIRELESS
MULTI-STORY RESIDENCE1-STORY RESIDENCE
Wireless Alarms
Wireless Interconnected Alarms
Hardwired Interconnected 
AC or AC/DC Alarms
Smoke Alarms
CO Alarms
Both OR Combination 
Smoke/CO Alarms
09
  AGENCY PLACEMENT RECOMMENDATIONS
Standards: Underwriters Laboratories Inc. Single and Multiple Station Smoke Alarms 217.
NFPA 72 CHAPTER 29 “FOR YOUR INFORMATION, THE NATIONAL FIRE ALARM AND SIGNALING 
CODE, NFPA 72, READS AS FOLLOWS:”
29.5.1* Required Detection.
29.5.1.1* Where required by other governing laws, codes, or standards for a specic type of 
occupancy, approved single and multiple-station Smoke Alarms shall be installed as follows:
1.  *In all sleeping rooms and guest rooms
2.  *Outside of each separate dwelling unit sleeping area, within 21 ft (6.4 m) of any door to a 
sleeping room, with the distance measured along a path of travel
3.  On every level of a dwelling unit, including basements
4.  On every level of a residential board and care occupancy (small facility), including basements and 
excluding crawl spaces and unnished attics
5.  *In the living area(s) of a guest suite
6.  In the living area(s) of a residential board and care occupancy (small facility)
(Reprinted with permission from NFPA 72
®
, National Fire Alarm and Signaling Code Copyright © 2012 
National Fire Protection Association, Quincy, MA 02269. This reprinted material is not the complete 
and ofcial position of the National Fire Protection Association, on the referenced subject which is 
represented only by the standard in its entirety).
(National Fire Alarm and Signaling Code
®
 and NFPA 72
®
 are registered trademarks of the National Fire 
Protection Association, Inc., Quincy, MA 02269).
CALIFORNIA STATE FIRE MARSHAL (CSFM)
Early warning detection is best achieved by the installation of re detection equipment in all rooms 
and areas of the household as follows: A Smoke Alarm installed in each separate sleeping area (in 
the vicinity, but outside bedrooms), and Heat or Smoke Alarms in the living rooms, dining rooms, 
bedrooms, kitchens, hallways, nished attics, furnace rooms, closets, utility and storage rooms, 
basements, and attached garages.
10
  SPECIAL COMPLIANCE CONSIDERATIONS
This Smoke Alarm is suitable for use in apartments, condominiums, townhouses, hospitals, day care 
facilities, health care facilities, boarding houses, group homes and dormitories provided a primary re 
detection system already exists to meet re detection requirements in common areas like lobbies, 
hallways, or porches. Using this Smoke Alarm in common areas may not provide sufcient warning to 
all residents or meet local re protection ordinances/regulations.
This Smoke Alarm alone is not a suitable substitute for complete re detection systems in places 
housing many people—like apartment buildings, condominiums, hotels, motels, dormitories, hospitals, 
health care facilities, nursing homes, day care facilities, or group homes of any kind. It is not a 
suitable substitute for complete re detection systems in warehouses, industrial facilities, commercial 
buildings, and special-purpose non-residential buildings which require special re detection and Alarm 
systems. Depending on the building codes in your area, this Smoke Alarm may be used to provide 
additional protection in these facilities.
In new construction, most building codes require the use of AC or AC/DC powered Smoke Alarms only. 
In existing construction, AC, AC/DC, or DC powered Smoke Alarms can be used as specied by local 
building codes. THIS EQUIPMENT SHOULD BE INSTALLED IN ACCORDANCE WITH THE NATIONAL FIRE 
PROTECTION ASSOCIATION’S STANDARD 72 (National Fire Protection Association, Batterymarch Park, 
Quincy, MA 02269). Refer to NFPA 101 (Life Safety Code), local building codes, or consult your Fire 
Department for detailed re protection requirements in buildings not dened as “households”.
FCC COMPLIANCE
This equipment has been tested and found to comply with the limits for a Class B digital device, 
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection 
against harmful interference in a residential installation. This equipment generates, uses and can 
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may 
cause harmful interference to radio communications.
However, there is no guarantee that the interference will not occur in a particular installation. If this 
equipment does cause harmful interference to radio or television reception, which can be determined 
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or 
more of the following measures:
•  Reorient or relocate the receiving antenna.
•  Increase the separation between the equipment and receiver.
•  Connect the equipment into an outlet on a circuit different from that of the receiver.
•  Consult the dealer or an experienced radio or TV technician for help.
! WARNING!
Changes or modications to the product, not expressly approved by First Alert, could void the user’s 
authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two 
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any 
interference received, including interference that may cause undesired operation.
11
  GENERAL LIMITATIONS OF SMOKE ALARMS
Smoke Alarms have played a key role in reducing deaths resulting from home res worldwide. 
However, like any warning device, Smoke Alarms can only work if they are properly located, installed, 
and maintained, and if smoke reaches them. They are not foolproof.
Smoke Alarms may not waken all individuals. Practice the escape plan at least twice a year, 
making sure that everyone is involved – from kids to grandparents. Allow children to master re 
escape planning and practice before holding a re drill at night when they are sleeping. If children 
or others do not readily waken to the sound of the Smoke Alarm, or if there are infants or family 
members with mobility limitations, make sure that someone is assigned to assist them in re drill and 
in the event of an emergency. It is recommended that you hold a re drill while family members are 
sleeping in order to determine their response to the sound of the Smoke Alarm while sleeping and to 
determine whether they may need assistance in the event of an emergency.
Smoke Alarms cannot work without power. Battery operated units cannot work if the batteries 
are missing, disconnected or dead, if the wrong type of batteries are used, or if the batteries are not 
installed correctly. AC units cannot work if the AC power is cut off for any reason (open fuse or circuit 
breaker, failure along a power line or at a power station, electrical re that burns the electrical wires, 
etc.). If you are concerned about the limitations of battery or AC power, install both types of units.
Smoke Alarms cannot detect res if the smoke does not reach the Alarms. Smoke from res in 
chimneys or walls, on roofs, or on the other side of closed doors may not reach the sensing chamber 
and set off the Alarm. That is why one unit should be installed inside each bedroom or sleeping area—
especially if bedroom or sleeping area doors are closed at night—and in the hallway between them.
Smoke Alarms may not detect re on another level or area of the home. For example, a stand-
alone unit on the second level may not detect smoke from a basement re until the re spreads. This 
may not give you enough time to escape safely. That is why recommended minimum protection is 
at least one unit in every sleeping area, and every bedroom on every level of your home. Even with 
a unit on every level, stand-alone units may not provide as much protection as interconnected units, 
especially if the re starts in a remote area. Some safety experts recommend installing interconnected 
AC powered units with battery back-up (see “About Smoke Alarms”) or professional re detection 
systems, so if one unit senses smoke, all units Alarm. Interconnected units may provide earlier 
warning than stand-alone units since all units Alarm when one detects smoke.
Smoke Alarms may not be heard. 
Though the Alarm horn in this unit meets or exceeds current 
standards, it may not be heard if: 1) the unit is located outside a closed or partially closed door, 2) residents 
recently consumed alcohol or drugs, 3) the Alarm is drowned out by noise from stereo, TV, trafc, air 
conditioner or other appliances, 4) residents are hearing impaired or sound sleepers. Special purpose units, 
like those with visual and audible Alarms, should be installed for hearing impaired residents.
The Alarm may not have time to Alarm before the re itself causes damage, injury, or death, 
since smoke from some res may not reach the unit immediately. Examples of this include 
persons smoking in bed, children playing with matches, when a person’s clothing catches re 
while cooking, res caused by violent explosions resulting from escaping gas, or incendiary 
res where the re grows so rapidly that an occupant’s egress is blocked even with properly 
located Smoke Alarms.
Smoke Alarms are not foolproof. Like any electronic device, Smoke Alarms are made of components 
that can wear out or fail at any time. You must test the unit weekly to ensure your continued 
protection. Smoke Alarms cannot prevent or extinguish res. They are not a substitute for property or 
life insurance.
Smoke Alarms have a limited life. The unit should be replaced immediately if it is not operating 
properly. You should always replace a Smoke Alarm after 10 years from date of purchase. Write the 
purchase date on the space provided on back of unit.
Specyfikacje produktu
| Marka: | First Alert | 
| Kategoria: | Detektor dymu | 
| Model: | SMI105-AC | 
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