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USER’S MANUAL
SMOKE & CARBON MONOXIDE ALARM
AC POWERED WITH BATTERY BACKUP
Model SMICO100-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 and Carbon Monoxide Alarm needs. You have 
purchased a state-of-the-art Smoke & Carbon Monoxide Alarm designed to help provide you with early 
warning of a smoke and/or carbon monoxide danger. Please take the time to read this manual and 
make the Smoke & Carbon Monoxide 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.
•  This carbon monoxide alarm is designed to detect carbon monoxide gas from ANY 
source of combustion.
! WARNING!
•  This Smoke Alarm cannot operate without working batteries. Removing the batteries for any 
reason, or failing to replace the batteries at the end of their service life, 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
WHERE TO INSTALL THIS ALARM
Minimum coverage for Smoke Alarms, as recommended by the National Fire Protection Association 
(NFPA), is one Smoke Alarm on every oor, in every sleeping area, and in every bedroom (See 
“Regulatory Information For Smoke Alarms” for details on the NFPA recommendations).
For CO Alarms, the National Fire Protection Association (NFPA) recommends that a CO Alarm 
should be centrally located outside of each separate sleeping area in the immediate vicinity of the 
bedrooms. For added protection, install additional CO Alarms in each separate bedroom, and on every 
level of your home.
NOTE: For added protection, install an additional Smoke/CO Alarm at least 15 feet (4.6 meters) away 
from the furnace or fuel burning heat source where possible. In smaller homes or in manufactured 
homes where this distance cannot be maintained, install the Alarm as far away as possible from the 
furnace or other fuel burning source. Installing the Alarm closer than 15 feet (4.6 meters) will not harm 
the Alarm, but may increase the frequency of unwanted Alarms.
IN GENERAL, INSTALL COMBINATION SMOKE AND CARBON MONOXIDE ALARMS:
•  On every level of your home, including nished attics and basements.
•  Inside every bedroom, especially if people sleep with the door partly or completely closed.
•  In the hall near every sleeping area. If your home has multiple sleeping areas, install a unit in each. 
If a hall is more than 40 feet (12 meters) long, install a unit at each end.
•  At the top of rst-to-second oor stairs.
•  At the bottom of the basement stairs.
•  For additional coverage, install Alarms in all rooms, halls, and storage areas, where temperatures 
normally remain between 40˚ F and 100˚ F (4.4˚ C and 37.8˚ C).
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/CO ALARMS 
IN THESE AREAS:
•  In garages, furnace rooms, crawl spaces and unnished attics. Avoid extremely dusty, dirty 
or greasy 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.
•  Within 5 feet (1.5 meters) of any cooking appliance. In air streams near kitchens. Air currents can 
draw cooking smoke into the smoke sensor and cause unwanted Alarms.
•  In extremely humid areas. This Alarm should be at least 10 feet (3 meters) from a shower, sauna, 
humidier, vaporizer, dishwasher, laundry room, utility room, or other source of high humidity.
•  In direct sunlight.
•  In turbulent air, like near ceiling fans or open windows. Blowing air may prevent CO or smoke from 
reaching the sensors.
•  In areas where temperature is colder than 40˚ F (4.4˚ C) or hotter than 100˚ F (37.8˚ C). These 
areas include non-airconditioned crawl spaces, unnished attics, uninsulated or poorly insulated 
ceilings, porches, and garages.
•  In insect infested areas. Insects can clog the openings to the sensing chamber.
•  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/CO Alarm. To avoid dead air spaces, 
follow installation recommendations below.
On ceilings, install Smoke/CO Alarms as close to the center of the ceiling as possible. If this is not 
possible, install the Smoke/CO 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/CO Alarms should be placed 
between 4 inches (102 mm) and 12 inches (305 mm) from the wall/ceiling line.
On a peaked, gabled, or cathedral ceiling, install the rst Smoke/CO Alarm within 3 feet (0.9 
meters) of the peak of the ceiling, measured horizontally. Additional Smoke/CO 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/CO 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.
Find the self-adhesive labels included with this Smoke/CO Alarm.
•  On each label write in the phone number of your emergency responder (like 911) and a qualied 
appliance technician.
•  Place one label near the Smoke/CO Alarm, and the other label in the “fresh air” location you plan 
to go if the Alarm sounds.
NOTE: A qualied appliance technician is dened as “a person, rm, corporation, or company that 
either in person or through a representative, is engaged in and responsible for the installation, testing, 
servicing, or replacement of heating, ventilation, air conditioning (HVAC) equipment, combustion 
appliances and equipment, and/or gas replaces or other decorative combustion equipment.”
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/CO Alarm base, hold the 
Smoke/CO 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
D
B
C
1
3
6
2
2
3
7
8
4
5
9
THE PARTS OF THIS  
SMOKE ALARM
A
   Smoke/CO LED (RED)
B
   Power LED (GREEN)
C
   Test/Silence button: Press and 
release to activate test, or to 
silence the Alarm.
D
   Battery Drawer
1
   Mounting Bracket
2
   Mounting Slots and Screws*
3
   Locking Pins  
(break out of bracket)
4
   Hot (Black) AC Wire
5
   Neutral (White) AC Wire
6
   Interconnect (Orange) Wire
7
   Lever to Open 
Battery Compartment
8
   Swing-Out 
Battery Compartment
9
   Quick-Connect 
Power Connector
   *Not Included
FOLLOW THESE SIMPLE STEPS 
The basic installation of this Smoke/CO 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 MUST
“Special Requirements 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 (usually white) in 
the junction box.
•  Connect the black wire on the power connector to the hot wire (usually black) 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 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 during testing, 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 Alarms can be interconnected. Under AC power, all units will Alarm when one 
senses smoke or CO. When power is interrupted, only the AC/DC units in the series will continue to 
send and receive signals. AC powered Alarms will not operate.
Interconnected units can provide earlier warning of a smoke/CO problem than stand-alone units, 
especially if the problem starts in a remote area of the dwelling. If any unit in the series senses smoke/
CO, all units will Alarm. To determine which Smoke/CO Alarm initiated an Alarm, refer to the table.
During an Alarm
On Initiating Alarm(s): Red LED(s) ashes 
(ash) rapidly
On All Other Alarms: Green LED(s) Constant Green  
(AC power), Off (on battery backup), Red LED(s) Off
After an Alarm (Latching)
On Initiating Alarm(s): Smoke Alarm:   Red LED(s) On 
for 2 seconds/Off for 2 seconds;   Red LED(s) CO Alarm:
On for 4 seconds/Off for 4 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 Alarm Models 7010, 9120, 3120B, 7010B, 7010BSL, 7020B, 7020BSL, 9120B, 
SA520, SC7010B, SC7010BV, SC9120B, SM100V-AC, SM300-AC, SM500-AC, SMI100-AC, SMI105-AC 
and SM110LED-AC; First Alert Smoke & CO Alarm Models 1039102, 7030BSL, SMCO100V-AC, 
SMICO100-AC, SMICO105-AC, and SMCO110LED-AC; First Alert CO Alarm Models CO5120BN and 
CO5120PDBN; First Alert Heat Alarm Model HD6135FB; RM4 Relay and SLED177 Strobe when 
connected via an RM4 Relay.
INTERCONNECTED UNITS MUST MEET ALL OF THE FOLLOWING REQUIREMENTS:
•  A maximum of 18 compatible units may be interconnected (Maximum of 12 Smoke 
Alarms) per NFPA 72.
•  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;   Constant Green; 
Smoke/CO LED: Off
Alarm Operating 
on Battery Backup
Horn: Power LED: Silent;   Flashes Green 
every minute;   OffSmoke/CO LED:
When You Test the Alarm
Horn: 3 beeps, pause, 3 beeps, followed by, 4 beeps, 
pause, 4 beeps; Power LED: Green if AC power to 
Alarm is On, Off if Alarm is operating under DC power; 
Smoke/CO LED: Flashes Red in sync with horn
If Battery Becomes 
Low or is Missing
If AC power to Alarm is on OR rst 15 minutes 
after AC power is removed, Low Battery Latch 
is now engaged.
Horn: Power LED: Chirps 1 time every minute;   Flashes 
Green 2 seconds on/2 seconds off;   Off Smoke/CO LED:
(see Latching Features note below)
After rst 15 minutes, if AC power to Alarm is Off
Horn: Power LED: Chirps 1 time every minute;   Flashes 
Green 1 time every minute;   OffSmoke/CO LED:
If Alarm is Not 
Operating Properly 
(MALFUNCTION SIGNAL)
Horn: Power LED: 3 chirps every minute;   3 
Green Flashes approximately once a minute; 
Smoke/CO LED: Off
Alarm has reached 
its End of Life
Horn: Power LED: 5 chirps every minute;   5 
Green Flashes approximately once a minute; 
Smoke/CO LED: Off
Smoke is Detected
Horn: 3 beeps, pause, 3 beeps; Power LED: Constant 
Green (AC power), Off (on battery backup);  
Smoke/CO LED: During Alarm: Flashes Red in sync 
with the horn pattern. After Alarm: Flashes Red On for 2 
seconds/Off for 2 seconds. Smoke Alarm Latch is now 
engaged (See Latching Features section for details)
Smoke Alarm is Silenced
Horn: Power LED: Off (for up to 15 minutes);   Constant 
Green (AC power), Off (on battery backup);  
Smoke/CO LED: Flashes Red;
Smoke is Detected in Another 
Interconnected Alarm
Horn: 3 beeps, pause, 3 beeps; Power LED: 
Constant Green (AC power), Off (on battery 
backup);   OffSmoke LED:
Alarm Levels of CO are Detected
Horn: 4 fast beeps, pause, 4 fast beeps; Power LED: 
Constant Green (AC power), Off (on battery backup); 
Smoke/CO LED: During Alarm: Flashes Red in sync 
with the horn pattern. After Alarm: Flashes Red On for 
4 seconds/Off for 4 seconds. CO Alarm Latch is now 
engaged. (See Latching Features section for details).
CO Alarm is Silenced
Horn: Power LED: Off (for up to 6 minutes);   Constant 
Green (AC power), Off (on battery backup)  
Smoke/CO LED: Flashes Red
CO is Detected in Another 
Interconnected Alarm
Horn: 4 fast beeps, pause, 4 fast beeps; Power 
LED: Constant Green (AC power), Off (on battery 
backup);   OffSmoke LED:
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. 
04
  ALARM FEATURES
•  For protection during power outages.Battery Backup: 
•  Identies unit that initiated Alarm.Alarm Indicator: 
•   Add protection in minutesEasy Installation:
LATCHING FEATURES
Alarm Latch is activated after an Alarm is exposed to Alarm levels of smoke or carbon 
monoxide. 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. 
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 have the battery replaced.
Latching Alarm 
Unit was exposed to 
Alarm levels of smoke
Latching Not Activated 
Unit was not exposed to 
Alarm levels of smoke
“SMART INTERCONNECT” FEATURE
This Alarm includes “Smart Interconnect” which enables the Alarm to be interconnected with other First 
Alert
®
 Smoke, Heat, and “Smart Interconnect” CO Alarms. When smoke is detected, all Alarms will sound 
the smoke horn pattern. When CO is detected, “Smart Interconnect” Alarms will sound the CO horn pattern. 
Alarms that do not have the “Smart Interconnect” feature will remain silent during a CO Alarm.
LOCKING FEATURES
The optional locking features are designed to discourage unauthorized removal of the 
battery or Alarm. It is not necessary to activate the locks in single-family households where 
unauthorized battery or Alarm removal is not a concern.
Battery Drawer Lock
Mounting 
Bracket Lock
Locking Pin
These Smoke/CO Alarms have two separate 
locking features: one locks the battery 
compartment, and the other locks the Smoke/
CO Alarm to the mounting bracket. You can 
choose to use either feature independently, 
or use them both.
Tools you will need: Needle-nose pliers or utility 
knife, standard athead screwdriver
Both locking features use locking pins, which are 
molded into the mounting bracket. Using needle 
nose pliers or a utility knife, remove one or both 
pins from the mounting bracket, depending on 
how many locking features you want to use.
TO LOCK THE BATTERY COMPARTMENT
Do not lock the battery compartment until you have installed the battery and tested the 
battery back-up.
1.  Push and release the Test/Silence button on the Smoke/CO Alarm until the Alarm sounds: 
3 beeps, pause, 3 beeps, pause, 4 beeps, pause, 4 beeps, pause.
IMPORTANT!
If the unit does not Alarm during testing, DO NOT lock the battery compartment! 
Install a new battery and test again. If the Alarm still does not Alarm, replace 
it immediately.
2.  Using needle-nose 
pliers or a utility 
knife, detach one 
locking pin from the 
mounting bracket.
3.  Push the locking pin 
through the black 
dot on the label 
on the back of the 
Smoke/CO Alarm.
TO UNLOCK THE BATTERY COMPARTMENT
Once the Alarm is installed, you must disconnect it from the AC power before unlocking 
the battery compartment.
 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.  Remove the Alarm from the mounting bracket. If the unit is locked to the bracket, see the 
section “To Unlock the Mounting Bracket.”
2.  Disconnect the power connector by gently prying 
it away from the back of the Alarm.
3.  Insert a athead screwdriver under the head of 
the locking pin, and gently pry it out of the battery 
compartment lock. (If you plan to relock the 
battery compartment, save the locking pin.)
4.  To relock the battery compartment, close the 
battery door and reinsert locking pin in lock.
5.  Reconnect the power connector to the back of the Alarm, reattach the Smoke Alarm to the 
mounting bracket, and restore the power.
IMPORTANT!
When replacing the batteries, always test the Alarm before relocking the battery compartment.
TO LOCK THE MOUNTING BRACKET
1.  Using needle-nose pliers, 
detach one locking pin from 
mounting bracket.
2.  Insert the locking pin into the 
lock located opposite from 
the battery drawer as shown 
in the diagram.
3.  When you attach the 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.
! WARNING!
Always discharge the branch circuit before servicing an AC or AC/DC Smoke/CO Alarm. 
First, turn off the AC power at the circuit breaker or fuse box. Next, remove the battery 
from Smoke/CO Alarms with battery back-up. Finally press and hold the test button.
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!
•   use an open ame of any kind to test this unit. You might accidentally damage or set re NEVER
to the unit or to your home.   use vehicle exhaust! Exhaust may cause permanent damage NEVER
and voids your warranty.
•   stand close to the Alarm when the horn is sounding. Exposure at close range may be DO NOT
harmful to your hearing. When testing, step away when horn starts sounding.
! CAUTION!
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/CO Alarm.
1.  Push and release the Test/Silence button on the cover until you hear a “chirp.” The “chirp” marks 
the start of the self-test sequence.
2.  During testing, you will hear a loud, repeating horn pattern: 3 beeps, pause, 3 beeps, pause, while 
the red smoke LED ashes. Then you will hear a loud, repeating horn pattern: 4 beeps, pause, 4 
beeps, pause, while the red CO LED ashes.
3.  When testing a series of interconnected units you must test each unit individually. Make sure all 
units Alarm when each one is tested.
If the Smoke/CO Alarm does not test properly:
1.  Make sure the AC power is applied and battery is fresh and installed correctly.
2.  Be sure the Alarm is clean and dust-free.
3.  Test the unit again.
If the Smoke/CO Alarm is still not working properly, replace it immediately. Refer to the  
“Limited Warranty” at the end of this manual.
! WARNING!
If there is still a problem, do not try to x the Alarm yourself. This will void your warranty!
REGULAR MAINTENANCE
! WARNING!
Use only the replacement batteries listed below. The unit may not operate properly with other 
batteries. Never use rechargeable batteries since they may not provide a constant charge.
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/CO Alarm at least once a month; gently vacuum the outside of the Smoke/CO 
Alarm using your household vacuum’s soft brush attachment. Test the Smoke/CO Alarm. Never use 
water, cleaners or solvents since they may damage the unit.
•  If the Smoke/CO Alarm becomes contaminated by excessive dirt, dust and/or grime, and cannot be 
cleaned to avoid unwanted Alarms, replace the unit immediately.
•  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.
•  Relocate the unit if it sounds frequent unwanted Alarms. See “Where This Alarm Should Not Be 
Installed” for details.
When the battery back-up becomes weak, the Alarm will “chirp” about once a minute (the low battery 
warning). This warning should last 7 days, but you should replace the battery immediately to continue 
your protection. This Alarm must have AC or battery power to operate. If AC power fails, and the 
battery is dead or missing, the Alarm cannot operate. 
! WARNING!
DO NOT spray cleaning chemicals or insect sprays directly on our near the Alarm.   paint over DO NOT
the Alarm. Doing so may permanently damage the Alarm.
CHOOSING A REPLACEMENT BATTERY:
This Smoke/CO Alarm requires one standard 9V alkaline battery. The following alkaline batteries 
are acceptable as replacements: Duracell #MN1604 or MX1604; Eveready “Energizer” 522. These 
batteries are available at many local retail stores.
! WARNING!
•  Always use the exact batteries specied by this User’s Manual.   use rechargeable DO NOT
batteries. Clean the battery contacts and also those of the device prior to battery installation. 
Install batteries correctly with regard to polarity (+ and -).
•  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 Alarm and the environment in which it is installed. All 
the batteries specied above are acceptable replacement batteries for this unit. Regardless of the 
manufacturer’s suggested battery life, you   replace the battery immediately once the unit starts MUST
“chirping” (the “low battery warning”).
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 LED 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. Make 
sure a fresh 9V battery 
is installed to power the 
battery back-up*.
Green Power LED ashes ON, 
once a minute (horn is silent).
Alarm is not 
receiving AC power.
Unit is operating on battery 
back-up. Check the 
AC power supply.
Horn “chirps” about once 
per minute; Green “Power” 
LED ashes Green On 
for 2 seconds/Off for 2 
seconds. (Low Battery 
Latch is engaged.)
Battery is low or missing. Replace Battery*
Horn “chirps” and Green 
Power LED ashes 
once every minute.
Battery is low or missing.
Replace Battery*
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.
Horn “chirps” and Green 
Power LED ashes 5 
times every minute
END OF LIFE SIGNAL.  
Alarm needs 
to be replaced.
Immediately 
replace the Alarm.
Alarm goes back into 
Alarm after you pressed 
the Test/Silence button to 
silence an Alarm.
Smoke and/or 
CO levels are still 
potentially dangerous.
Refer to “If Your Smoke/CO 
Alarm Sounds” for details 
on how to respond to an 
Alarm. If anyone is feeling 
ill, EVACUATE your home 
immediately and call 911.
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.
CARBON MONOXIDE ALARM ONLY
CO Alarm goes back into 
Alarm 4 minutes after 
you Silence it.
CO levels indicate 
a potentially 
dangerous situation.
IF YOU ARE FEELING 
SYMPTOMS OF CO 
POISONING, EVACUATE 
your home and call 911 
or the Fire Department. 
Refer to “If The CO Alarm 
Sounds” for details.
CO Alarm sounds frequently 
even though no high levels 
of CO are revealed in 
an investigation.
The CO Alarm may be 
improperly located. Refer 
to “Where to Install This 
Alarm” for details.
Relocate your Alarm. If 
frequent Alarms continue, 
have home rechecked for 
potential CO problems. You 
may be experiencing an 
intermittent CO problem.
SMOKE ALARM ONLY
Smoke Alarm sounds when 
no smoke is visible.
Unwanted Alarm may be 
caused by nonemergency 
source like cooking smoke.
Silence Alarm using manual 
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.
*For a list of acceptable replacement batteries, see “Regular Maintenance.”
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 YOUR SMOKE/CO ALARM SOUNDS
WHAT TO DO FIRST: IDENTIFY THE TYPE OF ALARM SIGNAL
Refer to previous section “What You Will See And Hear With This Alarm”.
! WARNING!
Actuation of your CO Alarm indicates the presence of carbon monoxide (CO) which can kill you. In 
other words, when your CO Alarm sounds, you must not ignore it!
IF THE CO ALARM SIGNAL SOUNDS:
1.  Press the Test/Silence button.
2.  Call your emergency services, re department or 911. Write down the number of your local 
emergency service here: 
____________________________________________________________________
3.  Immediately move to fresh air—outdoors or by an open door or window. Do a head count to check 
that all persons are accounted for. Do not re-enter the premises, or move away from the open door 
or window until the emergency services responder has arrived, the premises have been aired out, 
and your CO Alarm remains in its normal condition.
4.  After following steps 1-3, if your CO Alarm reactivates within a 24-hour period, repeat steps 
1-3 and call a qualied appliance technician to investigate for sources of CO from fuel-burning 
equipment and appliances, and inspect for proper operation of this equipment. If problems are 
identied during this inspection have the equipment serviced immediately. Note any combustion 
equipment not inspected by the technician, and consult the manufacturers’ instructions, or contact 
the manufacturers directly, for more information about CO safety and this equipment. Make sure 
that motor vehicles are not, and have not, been operating in an attached garage or adjacent to the 
residence. Write down the number of a qualied appliance technician here: 
____________________________________________________________________
NOTE: A qualied appliance technician is dened as “a person, rm, corporation, or company that 
either in person or through a representative, is engaged in and responsible for the installation, testing, 
servicing, or replacement of heating, ventilation, air conditioning (HVAC) equipment, combustion 
appliances and equipment, and/or gas replaces or other decorative combustion equipment.”
IF THE SMOKE/CO ALARM SOUNDS:
RESPONDING TO AN ALARM
! WARNING!
•  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 remove the batteries from a battery operated Smoke/CO Alarm to stop an unwanted Alarm 
(caused by cooking smoke, etc.). Removing batteries disables the Alarm so it cannot sense smoke, 
and removes your protection. Instead open a window or fan the smoke away from the unit. The 
Alarm will reset automatically.
•  If the unit Alarms get everyone out of the house immediately.
 DANGER!
ELECTRICAL SHOCK HAZARD. Do not restore power until all Alarms are completely installed. 
Restoring power before installation is complete may result in serious electrical shock, 
injury or death.
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/CO Alarms” for details.
07
  USING THE SILENCE FEATURES
! 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.
Never remove the batteries to quiet an unwanted Alarm. Removing the batteries disables the 
Alarm and removes your protection.
•  The Silence Feature is intended to temporarily silence the horn while you identify and correct the 
problem. Do not use the Silence Feature in emergency situations. It will not correct a CO problem 
or extinguish a re.
•  The Silence Feature can temporarily quiet an unwanted Alarm for several minutes. You can silence 
this Smoke/CO Alarm by pressing the Test/Silence button on the Alarm cover.
Activate the Alarm test, reset or silence function by use of a nger or thumb. Use of any other 
instrument is strictly prohibited.
When the Smoke Alarm is Silenced When the CO Alarm is Silenced
The Smoke Alarm will remain silent 
for up to 15 minutes, then returns to 
normal operation.
If the smoke has not cleared–or continues to 
increase–the device will go back into Alarm.
The CO Alarm will remain silent for 
up to 6 minutes.
After 6 minutes, if CO levels remain 
potentially dangerous the horn will start 
sounding again.
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.   The red LED on the initiating Alarm will ash. The red NOTE:
LED will be Off on all other non-initiating Alarms. Once silenced, no audible sound will be heard. 
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 timer is reset.
Tuotetiedot
| Merkki: | First Alert | 
| Kategoria: | Palovaroitin | 
| Malli: | SMICO100-AC | 
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