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USER’S MANUAL
SMOKE & CARBON MONOXIDE ALARM
AC POWERED WITH VOICE & LOCATION
Model SMCO100V-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; 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, 120VAC pure sine wave 60Hz 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.
•  This 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 at least 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.
•  This Smoke/CO Alarm has a battery drawer which resists closing unless a battery is 
installed. This warns you the unit will not operate under DC power without a battery.
•  Do not stand too close to the unit when the alarm is sounding. It is loud to wake you in an 
emergency. Exposure to the horn at close range may harm your hearing.
•  Do not paint over the unit. Paint may clog the openings to the sensing chambers 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 and co 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, 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. However, they do not 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.   will operate if electricity fails, AC with battery (DC) back-up:
provided the batteries are fresh and correctly installed. AC and AC/DC units must be installed by a 
qualied electrician.
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 Alarm 
with most battery-powered UPS (uninterruptible power supply) products or square wave or “quasi sine 
wave” inverters  . If you are not sure about your inverter or UPS type, please will damage the Alarm
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. 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 and 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 ceiling, place the Alarm as close to the center as possible.
•  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.
•  In either case, install at least 4 inches (102 mm) from where the wall and ceiling meet. See 
“Avoiding Dead Air Spaces” for more information.
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 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 air-conditioned 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 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 the 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/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.
Tools you will need: needle-nose pliers or utility knife, standard athead screwdriver, wire strippers
! 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 Alarm base, hold the 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   rst. Insert a at screwdriver blade POWER OFF
between the power connector and the security tab inside the power input block. Gently pry back the 
tab and pull the connector free.
THE PARTS OF 
THIS SMOKE/CO ALARM
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
8
  Turn this way to  
  remove from bracket
9
  Turn this way to  
  attach to bracket 
10
  Slide-Out Battery Drawer
1
2
3
4
6
5
9
8
7
2
10
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.
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.
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.
3.  If there’s a battery pull tab, activate the battery back-up by removing the “Pull to Activate Battery 
Back-Up” tab. If batteries are 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.
! 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.
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.  Test each Alarm. Press and hold the Test/Silence button until the unit Alarms. When testing a 
series of interconnected units you must test each unit individually. Make sure all units 
Alarm when each one is tested.
 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 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 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
On All Other Alarms: Red LED is 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) On, 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 Model: SMI100-AC, and Smoke/CO Model: SMCO100V-AC; BRK Electronics
®
Smoke Alarm Models 9120, 9120B, SC9120B, 7010, 7010B; BRK Electronics
®
 Heat Alarm Models 
HD6135F; BRK Electronics
®
 CO Alarm Models CO5120BN, CO5120PDBN; Smoke/CO Alarm Model 
SC7010BV, SC7010B.
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)
STEP BY STEP GUIDE TO PROGRAMMING THIS ALARM
For First Time and When Changing Batteries
Action Alarm Will Say
Insert batteries (2, AA batteries)
“Welcome, First Alert Carbon Monoxide 
and Smoke Alarm.”
“No location programmed” if rst time or “[Location, 
example: “Basement”] location programmed” when 
changing batteries.
“To select location, press and hold test button now.”
Press & hold test button if 
you would like to program the 
location or change the location 
of the alarm. Release button 
after alarm responds.
“To save location, press and hold test button 
after location is heard.” Alarm will speak list of 
locations (see below).
After you hear the location 
of where you are placing 
the alarm, press & hold 
the test button.
“[Location, example: “Basement”] location saved.” If no 
location is chosen: “No location saved.”
Your Alarm has now been programmed for the location of your choice.
Available Locations: Basement, Hallway, Ofce, Child’s Bedroom, Kitchen, Utility Room, 
Dining Room, Living Room, Family Room, Master Bedroom, Guest Bedroom, No Location.
For Reprogramming: When it is necessary to reprogram the Alarm after the unit has been 
activated and is in normal operation: Tap the test button 5 times to reset the Alarm to again 
access the programming menu.
Action What You Will See & Hear
Normal Operations
Voice: Power/Smoke LED: Silent;   Constant Green; 
Horn: CO LED: Silent;   Off
When You Test the Alarm
Voice: “Testing.” Horn: 3 beeps, pause, 3 beeps; 
Voice: “Warning, evacuate smoke in [Location, 
example: “Basement”]. Evacuate.”; Power/Smoke 
LED: CO  Flashes Red in sync with the horn pattern; 
LED: Horn: Off, followed by   4 fast beeps, pause, 4 fast 
beeps;   “Warning, evacuate carbon monoxide in Voice:
[Location, example: “Basement”]. Evacuate.” Pause. 
“Highest carbon monoxide level was [CO level example: 
_0_ ppm]”;   Off;   Flashes Power/Smoke LED: CO LED:
Red in sync with the horn pattern.
If Battery Becomes 
Low or is Missing
Voice: “Replace battery in [Location, example 
“Basement”].” Repeated every 5 hours;   chirps Horn:
once a minute;   Flashes Green On Power/Smoke LED:
for 2 seconds/Off for 2 seconds. Low Battery Latch is 
now engaged. Flashes Green once a minute if AC power 
is off;   OffCO LED:
If Alarm is Not 
Operating Properly 
(MALFUNCTION SIGNAL)
Voice: “Detector error in [Location, example 
“Basement”], please see manual.” Repeated every 
5 hours;   3 chirps every minute; Horn: Power/
Smoke LED: 3 Green Flashes approximately once a 
minute;   OffCO LED:
Alarm has reached 
its End of Life
Voice: “Detector error in [Location, example 
“Basement”], please see manual.” Repeated every 
5 hours;   5 chirps every minute; Horn: Power/
Smoke LED: 5 Green Flashes approximately once a 
minute;   OffCO LED:
Smoke is Detected
Horn: 3 beeps, pause, repeating 9 times;   Voice:
“Warning, evacuate smoke in [Location, example: 
“Basement”]. Evacuate.”;   3 beeps, pause, Horn:
repeating 2 times followed by Voice Warning above; 
Power/Smoke 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;   OffCO LED:
Alarm Levels of CO are Detected
Horn: 4 fast beeps, pause, 4 fast beeps, pause*;   Voice:
“Warning, evacuate carbon monoxide in [Location, 
example: “Basement”]. Evacuate.” Pause. “Highest 
carbon monoxide level was [CO level example: ___ 
ppm]”;   4 beeps, pause, 4 beeps, pause repeating Horn:
2 times followed by Voice Warning above; Power/
Smoke LED: CO LED: Off;   During Alarm: Flashes Red 
in sync with the horn pattern. After Alarm: Flashes Red 
On for 2 seconds/Off for 2 seconds. CO Alarm Latch 
is now engaged.
*NOTE: If unit goes into CO Alarm, the regular 4 beeps-
brief pause cycle will repeat for fteen minutes. After 
fteen minutes, the pause will increase to one minute.
Smoke Alarm is Silenced
Voice: “Horn silenced. Detector active.”;   Off; Horn:
Power/Smoke LED: CO LED: Flashes Red;   Off
CO Alarm is Silenced
Voice: “Horn silenced. Detector active.”;   Off; Horn:
Power/Smoke LED: CO LED: Off;   Flashes Red
04
  ALARM FEATURES
•  Friendly voice tells you what the danger is and it’s location.Voice & Location Alerts: 
•  When one alarm sounds, all compatible* alarms sound.Early Warning Interconnect: 
•  Allows for easy installation. No need to rewire.Quick Connect Plug: 
LOCKING FEATURES
The locking features are designed to discourage unauthorized removal of the batteries 
or Alarm. It is not necessary to activate the locks in single-family households where 
unauthorized battery or Alarm removal is not a concern.
These Alarms have two separate locking features: one to lock the battery compartment, and 
the other to lock the Alarm to the mounting bracket. You can choose to use either feature 
independently, or use them both.
Tools you will need: Needle-nose pliers, 
Standard Flathead screwdriver.
Both locking features use locking pins, which 
are molded into the mounting bracket. Using 
needle-nose pliers, remove one or both pins 
from the mounting bracket, depending on how 
many locking features you want to use.
IMPORTANT!
To permanently remove either lock, insert a athead screwdriver between the locking 
pin and the lock, and pry the pin out of the lock.
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 hold Test/Silence button until 
the Alarm sounds.
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, detach one locking pin 
from the mounting bracket.
3.  Push the locking pin through the hole near the 
battery drawer on the back of the Alarm.
TO UNLOCK THE BATTERY COMPARTMENT
IMPORTANT!
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.
! WARNING!
Always discharge the branch circuit before servicing an AC or AC/DC Alarm. First, turn off 
the AC power at the circuit breaker or fuse box. Next, remove the battery from Alarms with 
battery back-up. Finally, press and hold the Test/Silence button for 5-10 seconds to discharge 
the branch circuit.
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 Alarm. First, turn off the AC power 
at the circuit breaker or fuse box. Next, remove the 
battery from Alarms with battery back-up. Finally, 
press and hold the Test/Silence button for 5-10 
seconds to discharge the branch circuit.
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.
•  If the Alarm ever fails to test properly, replace it immediately. Products under warranty may be 
returned to the manufacturer for replacement. See “Limited Warranty” at the end of this manual.
! 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.
You can test this Smoke/CO Alarm by pressing and holding the Test/Silence button on the Alarm 
cover until Alarm Voice says “Testing” (typically 3-5 seconds).
Activate the Alarm test, reset or silence function by use of a nger or thumb. Use of any other  
instrument is strictly prohibited.
During testing, you will see and hear the following sequence:
•  The Alarm Voice will say “Testing.” The Horn will sound 3 beeps, pause, 3 beeps. The Alarm   Voice
will say “Warning, evacuate smoke in [Location, example: “Basement”]. Evacuate.” The Power/
Smoke LED CO LED ashes Red and the   will be Off.
•  Next the Horn will sound 4 beeps, pause, 4 beeps. The Alarm Voice will say “Warning, evacuate 
carbon monoxide in [Location, example: “Basement”]. Evacuate.” The Power/Smoke LED will be 
Off and the   ashes Red.CO LED
If the unit does not alarm, make sure the batteries are correctly installed, and test again. If the 
unit still does not alarm, replace it immediately.
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/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 light continues to ash, replace Alarm.
•  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), and the   will say “Replace battery in [Location, example “Basement”].” Voice
Repeated every 5 hours. This warning should last 7 days, but you should replace the battery 
immediately to continue your protection. The Low Battery Latch feature will be engaged. The 
Green Power/Smoke LED will ash On for 2 seconds/Off for 2 seconds.
•  Protect or cover the alarm when doing any maintenance to home i.e. sanding oors, painting, 
drywall patching, etc. to prevent contamination.
CHOOSING A REPLACEMENT BATTERY:
Your Smoke/CO Alarm requires two “AA” Duracell MN1500/LR6 and Energizer E91 batteries. 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”).
To replace the batteries (without removing Alarm from the ceiling or wall):
1.  Open the battery compartment.
2.  Press tabs A and B as shown in the diagram 
and remove each battery.
3.  Insert the new batteries, making sure they 
snap completely into the battery compartment. 
Match the terminals on the ends of the 
batteries with the terminals on the unit.
4.  Close the battery compartment, and then test 
the unit by pressing the Test/Silence button.
A
B
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...
Horn “chirps” and LED 
ashes green about once 
per minute, or LED ashes 
Green On for 2 seconds/
Off for 2 seconds. (Low 
Battery Latch is engaged.) 
Voice: “Replace battery in 
[Location]” every 5 hours
Low battery warning.
Install two 
new AA batteries*.
Horn “chirps” and Green 
LED ashes 3 times 
every minute. Voice: 
“Detector error in [Location, 
example “Basement”], 
please see manual”, 
repeated every 5 hours.
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 
LED ashes 5 times 
every minute. Voice: 
“Detector error in [Location, 
example “Basement”], 
please see manual”, 
repeated every 5 hours.
END OF LIFE SIGNAL.  
Alarm needs to  
be replaced.
Immediately 
replace the Alarm.
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 “Choosing a Replacement Battery.”
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”.
IF THE CO ALARM SOUNDS
“ALARM-MOVE TO FRESH AIR”
If you hear the Alarm horn sound 4 beeps, pause, 4 beeps, pause, and the RED CO light 
is ashing, move everyone to a source of fresh air.
! 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.”
AFTER AN ALARM
After the emergency responders arrive, the premises aired out, and your CO Alarm 
remains in its normal condition, you can check what the highest carbon monoxide 
level sensed was:
Action Alarm Will Say
Press & Hold Test Button
“Highest carbon monoxide level was ___ 
ppm. Please see manual.”
“To clear highest carbon monoxide level, 
press and hold test button now.”
Press & Hold Test Button, if you would like to 
clear the highest level sensed. If you would 
like to keep the highest level in memory, do 
not press anything.
“Highest carbon monoxide 
level cleared.”
Alarm will say nothing.
IF THE SMOKE 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.
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!
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 for at 
least 3-5 seconds.
•  After the Test/Silence button is released, the Alarm Voice will say “Horn silenced, detector active.” 
The Red LED blinks during the silence mode.
When the Smoke Alarm is Silenced When the CO Alarm is Silenced
The Smoke Alarm will remain silent for up to 
15 minutes, then return 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 4 minutes.
After 4 minutes, if CO levels remain 
potentially dangerous the horn will start 
sounding again.
SILENCING THE LOW BATTERY WARNING
This Silence Feature can temporarily quiet the low battery warning “chirp” for up to 8 hours if AC power 
is present. Press the Test/Silence button on the Alarm cover until you hear the acknowledge “chirp”.
Once the low battery warning “chirp” Silence Feature is activated, the unit continues to ash the 
green light once a minute for 8 hours. After 8 hours, the low battery “chirp” will resume. The Alarm 
will continue to operate as long as AC power is supplied. However, replace the batteries as soon as 
possible, to maintain protection in event of a power outage.
To deactivate this feature: Press the Test/Silence button again. The unit will go into Test Mode and 
the low battery warning will resume (LED ashes and unit sounds “chirp” once a minute).
To silence alarms in an interconnected series: To silence an interconnected series of Smoke/CO 
Alarms, you must press the Test/Silence button on the initiating alarm (The unit with the ashing red 
light; the red light will be off on all other Alarms.). If you press the Test/Silence on any other Alarm, it 
will only silence that unit, not the whole interconnected series.
SILENCING THE END OF LIFE SIGNAL
This Silence Feature can temporarily quiet the End of Life warning “chirp” for up to 2 days. You can silence 
the End of Life warning “chirp” by pressing the Test/Silence button. The horn will chirp, acknowledging that 
the End of Life Silence Feature has been activated. After approximately 2 days, the End of Life “chirp” will 
resume. The timer shall not be able to be reset after 14 days following the initial end-of-life signal.
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 or carbon monoxide. This can help investigators pinpoint the source of smoke or CO. 
Interconnected Alarms. Latching Alarm Indicator shows which Alarm(s) in the series were 
exposed to alarm levels of smoke or carbon monoxide. 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 or CO present in the air has dropped below alarm levels. 
Specyfikacje produktu
| Marka: | First Alert | 
| Kategoria: | czujnik dymu | 
| Model: | SMCO100V-AC | 
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