First Alert Onelink AC10-500B User manual

Wi-Fi® Smoke + Carbon Monoxide Alarm
User’s Manual Model: AC10-500
Important! Please read carefully and save this document.
This user’s manual contains important information about your combination Smoke and CO 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.
Installed on
Replace by

2
Table of Contents
Welcome 3
Parts of this Alarm 4
Understanding Your Alarm 5
Where to Install 6 - 7
Where Not to Install 8
Set-Up and Installation 9 - 11
Installation of Adapter Plug 11 - 16
Wireless Interconnect 16 - 17
When the Alarm Sounds 17 - 18
Using the Silence Feature 18
Weekly Testing 19
Regular Maintenance 19
Alarm End of Life 20
Ionization and Photoelectric Technology 20
Fire Safety Tips 21
What You Need to Know About CO 22
Potential Sources of CO in the Home 23 - 24
Regulatory Information 25 - 27
Special Compliance 28 - 30
General Limitations 31 - 32
Troubleshooting Guide 33
Limited Warranty 34
Copyright and Technical Specifications 35

3
Welcome
Thank you for choosing First Alert for your safety needs. In addition to the alarm
sounds, you can receive notifications in case of an emergency to help provide a
warning of a fire or carbon monoxide leak while you are home or away. Please take
time to read this manual and make this alarm an integral part of your family’s safety
plan. Visit www.firstalert.com for additional information.
Contents
Smoke and
CO Alarm
Mounting
Bracket
Power Connector/
Adapter Plugs
User’s
Manual
System Requirements
Onelink App
Search and Download
Onelink app from
the App store
Wi-Fi Network
For best results,
recommended to use
with a 802.11 b/g/n router.
iOS Device
HomeKit™ requires an iPhone®, iPad®,
or iPod touch® with iOS 9 or later.
*Not compatible with Android®.
Valid Email
Account

4
Parts of this Alarm
1 Test/Silence Button
2 Color Indicator Ring
3 Speaker
1
2
3
8 Mounting Bracket
9 Mounting Slots
10 Turn Alarm Clockwise to Attach
11 Turn Alarm Counterclockwise
to Remove
8
11
10
9
4 Hot (black) AC Wire
5 Neutral (white) AC Wire
6 Interconnect (orange) AC Wire
7 Quick Connect Power Connector
4
5
6
7

5
Understanding Your Alarm
LED Color
Patterns Smoke / CO Events Voice Guide
Power Up and Welcome
Power Up
“First Alert welcomes you to your Onelink Smoke and Carbon
Monoxide Alarm. The Onelink App will guide you through the
simple setup process.”
Programming, Silencing & Pairing [voice complete]
Testing “The testing is complete. The test is done and you are protected.”
Emergency [voice complete]
Programming, Silencing & Pairing
“[Location, example: “Hallway”] Location Programmed.”
“Alarm silence. Detector Remains Active.”
“Alarm setup has been complete. Nice Work!”
Testing
“Testing Alarms... The alarm will sound and for your protection is
very loud. This may take a few seconds.”
“Highest carbon monoxide level was 0 PPM.”
Emergency “Highest carbon monoxide level was [Number] PPM.”
Testing
“Testing Smoke” [beep beep beep!]
“Testing Carbon Monoxide” [beep beep beep beep!]
“Evacuate, Evacuate, there’s Fire in the [Location]!”
Emergency “Warning! Evacuate! There is Smoke [or Carbon Monoxide] in the
[Location!] Evacuate!”
Malfunction “Detector error. Please see manual or call customer service.”
White
Power Indicator and Night Light N/A

6
Where to Install
Minimum coverage for Smoke Alarms, as recommended by the National Fire Protection Association (NFPA),
is one Smoke Alarm on every floor, 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 finished 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 first-to-second floor 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
• When installing on the wall, the top edge of Smoke Alarms should be placed between
4 inches (102 mm) and 6 inches (153 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.
• 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.
Installing Smoke/CO Alarms in Mobile Homes
For minimum security install one Smoke/CO Alarm as close to each sleeping area as possible. For more
security, put one unit in each room. Many older mobile homes (especially those built before 1978) have little
or no insulation. If your mobile home is not well insulated, or if you are unsure of the amount of insulation, it is
important to install units on inside walls only.

7
Where to Install (Continued)
SPEAKER OPENING
IN UPPER LEFT
CORNER
PLACE HERE
OR HERE
DO NOT PLACE
IN THIS AREA
4”
(102 mm)
minimum
between 4”- 6”
(102 mm - 153 mm)
from ceiling
CEILING
WALL

8
Where Not to Install
Do NOT locate this Smoke/CO Alarm:
• In garages, furnace rooms, crawl spaces and unfinished 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, humidifier,
vaporizer, dishwasher, laundry room, utility room, or other source of high humidity.
• In direct sunlight.
• In turbulent air, near ceiling fans or open windows. Blowing air may prevent CO/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, unfinished attics, uninsulated or poorly insulated ceilings, porches, and
garages.
• In insect infested areas. Insects can clog the openings to sensing chamber.
• Less than 12 inches (305 mm) away from fluorescent lights. Electrical “noise” can interfere with the sensor.
• In “dead air” spaces. See below for additional information.
Installing Smoke/CO Alarms in Mobile Homes
“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, below typical “dead air” spaces.
• On a peaked, gabled, or cathedral ceiling, install first 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.

9
Set-Up & 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.
~
IMPORTANT: The top edge of the Alarm MUST be between 4 and 6 inches down
from the ceiling. When wall mounting, it is suggested that the speaker opening is
in the upper left corner, as indicated by the illustration below.
!
Tools you will need:
• Needle-nose pliers or utility knife
• Standard phillips screwdriver
• Wire strippers
Ensure the iOS software is updated to iOS 9 and download
the Onelink App from the App Store.
Step 1 Download the free Onelink app from the App
Store and follow set-up instructions.
Step 2 Attach the mounting bracket to the junction box.
Step 3 Using wire nuts, connect the power connector to
the household wiring.
If any unit in the series does not alarm with the test button,
TURN OFF POWER and recheck connections. If it does not
alarm with the test button when you restore power, replace
it immediately.
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.
6
7
8
4
3
1
5
4
3
1
5
2
AB
}}
1. Smoke/CO 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)
Speaker
Opening

10
Set-Up & Installation (Continued)
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.
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.
Interconnect 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.
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.
!
If you need to remove the power connector, turn POWER OFF first. Insert a flat 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.
Step 4 Plug the power connector into the back of the alarm.
Step 5 Position the base of the Alarm over the mounting bracket, and turn the alarm clockwise(right) until the
unit is in its place. This activates the battery back-up. Once unit is activated, it can not be turned off.
NOTE: After you activate the Alarm, the Color Indicator Ring will power up and the Alarm will welcome you. To
program your alarm, follow the instructions provided in the Onelink app.
!
WARNING: iOS device notifications require a functional Wi-Fi connection. For best results,
recommended to use with a 802.11 b/g/n router. The notifications are only as reliable as your
Wi-Fi network and are not a substitute for a third party emergency monitoring service.

11
Set-Up & Installation (Continued)
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.
STAND-ALONE ALARM ONLY:
• If you are only installing one Smoke Alarm, restore power to the junction box.
INTERCONNECTED UNITS ONLY:
• If you are interconnecting multiple Smoke Alarms, repeat steps 1-5 for each Smoke Alarm in the series. When
you are finished, restore power to the junction box.
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
fluorescent lighting. Excessively noisy power may cause damage to your Alarm.
!
Installation of Adapter Plug
NOTE: Adapter plugs may not be included in all SKUs.
Installation Instructions:
Step 1 Verify which COMPATIBLE MODELS are installed in your system to determine the Adapter Plug to use.

12
Installation of Adapter Plug (Continued)
Compatible Models:
All of the following BRK/Kidde® / Fyrnetics® / Lifesaver® /Firex Alarms are compatible with AC10-500 Alarm, and can
be interconnected using the appropriate Adapter Plug.
Kidde® (K) – Fyrnetics® (E) Models
• 1285E, 1285K & 1285 – AC/DC Ion, Escape Light
• 1275EH – AC/DC Ion, Hush
• 1275E, 1275K, 1275 &1276E – AC/DC Ion
• 1235E, 1235K & 1235 – AC Ion
• PE120E & PE120 – AC/DC Photo
• HD135F – Heat Alarm
• PI2000 – AC/DC Ion/Photo
First Alert® / BRK® Alarms
• 9120 Series – AC, AC/DC Ion, Silence
• 7010 Series – AC, AC/DC Photo, Silence
• SC9120B – AC/DC Smoke/CO Combo
• HD6135FB – Heat Alarm
• RM4 – Auxiliary Relay
• AC10-500 - AC/DC Smoke/CO Combo
Firex® Models
• 4518 (model # ADC) – AC/DC Ion, battery in rear
• 4618, 5000 (model # FADC) – AC/DC Ion, battery drawer; 46182 = Alkaline Battery
• 4480 (model # PAD) – AC/DC Photo
• 5700 (model # ADH) – AC/DC Heat
• 499 – Auxiliary Relay
NOTE: Adapter Plug can be used on Firex® Models manufactured on or before January 1, 2005.

13
Installation of Adapter Plug (Continued)
Plug Pin
View
White
Orange
Black
Side View
NOTE: Twist tie should not be removed.
THE LISTED MODELS ARE THE ONLY MODELS THAT MAY BE INTERCONNECTED USING ONE OF THE ADAPTER
PLUGS INCLUDED. IF THE MODEL IS NOT LISTED, IT MUST BE REMOVED FROM THE SYSTEM.
NOTE: The following models are compatible, but the Adapter Plug CANNOT be used if the
Interconnected System contains these Firex® Models:
406 (model #G-6 ), 418, 421, 41216, & 428 – AC Ion
484 (model # PG-40) – AC Photo
• If the Interconnected System contains any model PG-40 alarms, a maximum of only 12 devices may be
interconnected.
• If the Interconnected System contains any model G-6 alarms, a maximum of only 6 devices may be
interconnected.

14
Installation of Adapter Plug (Continued)
WARNING: Installation of this unit must conform to the electrical codes in your area; Article 760 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.
!
Step 2 Turn off AC power.
Step 3 Remove unit. Remove old mounting bracket.
Step 4 Install new mounting bracket.
Step 5 Connect the black end of the appropriate Adapter Plug to the existing power connector.
NOTE: There may not be enough room for the Adapter Plug and additional wiring to fit in the junction
box. If not, the old power connector must be removed and replaced with the BRK® Power Connector.
Step 6 Connect the other end of the Adapter Plug to First Alert® / BRK® Alarm.
Step 7 Check all connections. Make sure all plugs are completely connected and snapped together. Ensure the
Adapter Plug is securely connected to the existing Power Connector.
Step 8 Install the base of the Alarm to the mounting bracket.
Step 9 Restore power to the junction box.
Step 10 Test each Alarm. Press and hold the test 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. RESTORE POWER. If any unit within interconnected alarms does not
alarm, replace it immediately.
~

15
Installation of Adapter Plug (Continued)
1 Mounting Bracket
2 First Alert® / BRK® Alarm
3 Kidde® Adapter
4 Firex® Adapter
5 Existing compatible
power connector
Electrical Rating:
120V AC, 100mA Maximum
Not for Current Interruption
1
3
2
4
5

16
Installation of Adapter Plug (Continued)
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® and BRK Electronics® Models listed in the User’s Manual.
!
Interconnected units must meet ALL of the following requirements:
• A maximum of 18 compatible units may be interconnected
(Maximum of 12 Smoke Alarms – Except Firex® models PG-40 and G-6).
• 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).
The interconnect wire should be #18 gauge or larger, rated at least 300V. If an interconnect wire is
not already part of your household wiring, you will need to install one. This type of wire is commonly
available at Hardware and Electrical Supply stores.
• All wiring must conform to all local electrical codes and Article 760 of NFPA 70 (NEC). Refer to NFPA 72,
NFPA 101, and/or your local building code for further connection requirements.
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. 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.
!
Wireless Interconnect
Benefits of Wireless Interconnect
The wireless interconnect feature on this alarm allows you to connect each of your First Alert Onelink alarms so
when one alarm sounds, they all will sound.
WARNING: Install alarms and test to assure range and reliability of interconnection throughout the house
!
• First Alert Onelink alarms can typically communicate with each other if they’re 50ft (15m) apart inside
a home. Keep in mind that some features of a home may reduce the interconnect range and reliability of
interconnection, including the number of floors, number/size of rooms, furniture, type of building
material,suspended ceilings, ductwork, large metallic appliances and metal studs. This kind of interference
may be fixed by adding more Onelink alarms that can route wireless signals around any various obstructions.
• Make sure you test your Onelink alarms for proper interconnection via the weekly testing.

17
Wireless Interconnect (Continued)
Wi-Fi Frequency
This alarm supports wireless frequency of 2.4Ghz b/g/n. For best results, recommended to use with a 802.11 b/g/n router.
Adding Additional Alarms
Simply follow the instructions on your Onelink app to add additional alarms to your account.
Identification of Events
If your alarm sounds, it is important to first identify the type of alarm.
When the Alarm Sounds
What To Do If The Smoke Alarm Sounds
• 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. NEVER ignore any alarm. Ignoring the alarm may result in injury or death.
• If the unit alarms get everyone out of the house immediately.
What To Do In Case of a Fire
• Don’t panic; stay clam. 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.
What To Do If The CO Alarm Sounds
1. Press the Test/Silence button (On App or on unit).
2. Call your emergency services, fire department or 911.
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 qualified 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 identified 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.

18
When the Alarm Sounds (Continued)
NOTE: A qualified appliance technician is defined as “a person, firm, 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
fireplaces or other decorative combustion equipment.”
Using the Silence Feature
The Silence Feature
This 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 fire. 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 or via the Onelink app. After the Test/Silence button
is released, the Red LED stops during the silence mode.
Silence 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 or via the Onelink app. 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.
WARNING: Never deactivate the unit to quiet an unwanted alarm. Deactivating
the alarm disables the unit and removes your protection.
!
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.
The CO Alarm will remain silent for up to 4
minutes.
If the smoke has not cleared or continues to
increase, the device will go back into alarm.
After 4 minutes, if CO levels remain potentially
dangerous, the horn will start sounding again.

19
Weekly Testing
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.
!
WARNING: DO NOT stand close to the Alarm when the horn is sounding. Exposure at close
range may be harmful to your hearing. When testing, step away when horn starts sounding.
!
WARNING: NEVER use an open flame of any kind to test this unit. You might
accidentally damage or set fire to the unit or to your home. NEVER use vehicle exhaust!
Exhaust may cause permanent damage and voids your warranty.
!
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).
During testing, you will see and hear the following sequence:
• The Alarm Voice will say “Testing Alarms... The Alarm will sound and for your protection is very loud. This may
take a few seconds
”. The LED chases Blue. The Alarm Voice will say “Testing Smoke”. The Horn will sound 3
beeps. The LED chases and flashes Red. The Alarm Voice will say “Testing Carbon Monoxide”. The Horn will
sound 4 beeps. The LED chases and flashes Red.
• Next The Alarm Voice will say “Evacuate, Evacuate, there’s a Fire in the [Location, example: “Kitchen”]”. The
LED chases Red. The Alarm Voice will say “Highest carbon monoxide level was 0 PPM”. The LED chases Blue.
The Alarm Voice will then say “The testing is complete. The test is done and you are protected”. The LED
glows Green.
If the unit does not alarm, make sure it has been activated correctly, 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. A can of clean compressed air (sold at computer or office
supply stores) may also be used. Follow manufacturer instructions for use. 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.
• Relocate the unit if it sounds frequent unwanted alarms. See “Where This Alarm Should Not Be Installed” for details.
IMPORTANT: Actual battery service life depends on the Smoke/CO Alarm and the environment
in which it is installed. Regardless of the manufacturer’s suggested battery life, you MUST replace
the Alarm immediately once the unit starts “chirping” (the “low battery warning”).
!

20
Alarm End of Life
Permanently Deactivating the Alarm
After 10 years of operation or low battery warning, deactivate the Alarm by following the diagram below: Insert a
tool below the edge shown and break tab. Then slide activation switch to DEACTIVATE mode.
NOTE: At end of life or low battery indication (chirp): unit must be put into deactivation mode to deactivate
remaining stored energy in battery. Unit will no longer function once put into this mode. Unit will resist re-mounting.
Once deactivated, replace Alarm immediately.
2. SLIDE SWITCH1. BREAK TAB
Ionization & Photoelectric Technology
This alarm uses Photoelectric technology.
All First Alert® Onelink® 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 fires.
Ionization Technology
Ionization technology is generally more sensitive than Photoelectric technology at detecting small particles,
which tend to be produced in greater amounts by flaming fires, which consume combustible materials rapidly and
spread quickly. Sources of these fires may include paper burning in a wastebasket, or a grease fire in the kitchen.
Photoelectric Technology
Photoelectric technology is generally more sensitive than ionization technology at detecting large particles,
which tend to be produced in greater amounts by smoldering fires, which may smolder for hours before
bursting into flame. Sources of these fires may include cigarettes burning in couches or bedding.
NOTE: For maximum protection, use both types of Smoke Alarms on each level and in every bedroom of your home.