BRK electronic SC6120B User manual

MODEL SC6120B—USER’S MANUAL
AC POWERED SMOKE AND
CARBON MONOXIDE ALARM WITH
BATTERY BACK-UP AND SILENCE
FEATURE
M06-1059-001 1/02
PLEASE READ CAREFULLY AND SAVE:
This unit was shipped with a user’s manual
that contains important information about its
operation. If you are installing this unit for use
by others, you must leave this manual—
or a copy of it—with the user.
BASIC FEATURES
•Smoke & CO Combo Alarm–Separate sensors
detect smoke and CO. The two alarm systems
work independently. However, in operation, the
Smoke Alarm has priority.
•Intelligent Sensing Technology–Reduces the
number of non-emergency or “nuisance”alarms.
•Latching Alarm Indicator–Identifies the initiating
alarm even after the alarm condition is over or
power is stopped.
•Interconnectable–With BRK smoke and carbon
monoxide alarms.
•Two Silence Features–
1. Temporarily silence the low battery chirp for up
to 8 hours.
2. Temporarily silence an unwanted alarm for
several minutes.
•Automatically performs internal self tests.
•Battery Compartment–Swings out for quicker,
easier battery installation.
•AC/DC Alarm–Operates on household voltage
with a 9V battery back-up.
THE CO ALARM
The Carbon Monoxide (CO) Alarm measures CO
levels in the air. It will alarm if CO levels rise quickly
(if the heat exchanger on your furnace breaks, for
example), or if CO is consistently present (a slow
CO leak in your stove or water heater).
THE SMOKE ALARM
The Smoke Alarm monitors the air for the presence of
combustion particles (produced when something
burns). When enough combustion particles reach the
smoke sensing chamber, it triggers an alarm.
Model
SC6120B

TABLE OF CONTENTS
Chapter 1: Introduction . . . . . . . . . . .Inside Cover
Basic Features . . . . . . . . . . . . . . . . .Front Cover
Basic Safety Information . . . . . . . . .Inside Cover
Smoke/CO Alarm Specifications . . . . . . . . . . . .2
How Your Smoke/CO Alarm Works . . . . . . . . . .3
Chapter 2: Installation . . . . . . . . . . . . . . . . . . . . . .4
Where to Install This Alarm . . . . . . . . . . . . . . . .4
Where NOT To Install This Alarm . . . . . . . . . . . .6
Locking Features . . . . . . . . . . . . . . . . . . . . . . . .7
How to Install This Alarm . . . . . . . . . . . . . . . . .10
Chapter 3: If Your Smoke/CO Alarm Sounds . . .14
What To Do If Carbon Monoxide is Detected . .14
What To Do If Smoke Is Detected . . . . . . . . . .15
Using the Silence Feature . . . . . . . . . . . . . . . .16
The ‘Latching Alarm’Indicator . . . . . . . . . . . . .17
Chapter 4: Testing and Maintenance . . . . . . . . .18
Chapter 5: Protecting Your Family . . . . . . . . . . .20
Protecting Your Family From CO Poisoning . . .20
Protecting Your Family From Fire . . . . . . . . . . .21
Chapter 6: What You Need To Know About CO .22
Chapter 7: Regulatory Information
for CO Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Chapter 8: Regulatory Information
for Smoke Alarms . . . . . . . . . . . . . . . . . . . . . . . .24
Chapter 9: Troubleshooting Guide . . . . . . . . . . .27
Chapter 10: Understanding the Light
and Horn Patterns . . . . . . . . . . . . . . . . . . . . . . . .28
Chapter 11: General Limitations
Of CO/Smoke Alarms . . . . . . . . . . . . . . . . . . . . .29
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . .30
CHAPTER 1: INTRODUCTION
BASIC SAFETY INFORMATION
Dangers, Warnings, and Cautions alert you to impor-
tant operating instructions or to potentially hazardous
situations. Pay special attention to these items.
This combination Smoke and Carbon Monoxide
Alarm will only indicate the presence of smoke or
CO at the sensor. Carbon Monoxide gas or smoke
may be present in other areas. The unit is not
designed to sense other gases, heat or flames.
This Smoke/CO Alarm is approved for use in single-fami-
ly residences. It is NOT designed for marine or RV use.
This device is not intended to alert hearing impaired
residents. Smoke alarms specifically designed for the
hearing impaired, which feature devices like flashing
strobe lights, are available to alert the hearing
impaired in case of fire.
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
Basic safety information (continued)...
Installation of this unit must conform to the elec-
trical 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 guide-
lines may result in injury or property damage.
This unit must be powered by a 24-hour, 120VAC
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 power the Alarm for 20 hours providing the 9V
battery is fresh and correctly installed. If AC power
fails and the battery is dead or missing, the Alarm
cannot operate.
NEVER ignore any alarm. Refer to Chapter 3 for
more information on how to respond to an alarm.
Failure to respond can result in injury or death.
Basic safety information (continued)...
Never disconnect the AC power or remove the
battery from the unit to stop an unwanted alarm
(caused by cooking smoke, etc.). Doing so will
disable the unit and remove your protection. In
the case of a true unwanted smoke alarm, use the
Silence Feature, open a window or fan the smoke
away from the unit. The alarm will reset automati-
cally when it returns to normal operation.
Connect this unit ONLY to other compatible units.
See “Interconnecting Multiple Alarms”in the “How
To Install This Alarm”section 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.
Do not stand too close to the unit when the alarm
is sounding. It is loud to wake you in an emer-
gency. Exposure to the horn at close range may
harm your hearing. When testing the unit, step
back when the horn starts sounding.
The Silence Feature is for your convenience only
and will not correct a problem. See Chapter 3 for
details on using the Silence Feature.
Continued...

2
Basic safety information (continued)...
Test this Smoke/CO Alarm once a week. If it ever
fails to test correctly, have it replaced immediately!
If the Alarm is not working properly, it cannot alert
you to a problem.
Do not paint over the Smoke/CO Alarm. Paint may
clog the openings to the sensing chamber and
prevent the sensors from operating properly.
DO NOT spray cleaning chemicals or insect sprays
directly on or near the Smoke/CO Alarm. Doing so
may permanently damage the Alarm. DO NOT
expose the Alarm to strong fumes. For example,
painting or fumigat ing.
ALARM SPECIFICATIONS
Audible Alarm: 85dB minimum at 10 feet (3 meters)
Power: Powered by 120VAC. The 9V battery back-up
provides 8 hours of standby and sounds alarm for 12
hours with fresh battery. When AC power is on, green
light (LED) shines continuously. Under battery power,
green light flashes once a minute.
Malfunction: Horn chirps and green light blinks
3 times (in rapid succession)
every minute.
Supply Voltage: 120VAC 60Hz, 0.09A
Warranty: 5-year limited warranty.
Continued...
Specifications (continued)...
THE SMOKE ALARM
During Alarm: Repeating Horn Pattern: 3 beeps,
pause, 3 beeps, pause, until silence button is
pressed, smoke dissipates, or power is lost.
•Stand-alone unit: Red Smoke light (LED) flashes
once per second.
•Interconnected series: Red Smoke light (LED)
flashes once per second on the initiating Alarm.
Red lights (LED) on all other alarms will not flash.
Standards: Underwriters Laboratories Inc. Single
and Multiple Station Smoke Alarms 217.
THE CARBON MONOXIDE ALARM
Gas Detection at Typical Temperature and
Humidity Ranges: The CO Alarm is not formulated to
detect CO levels below 30 ppm typically. UL tested
for false alarm resistance to Methane (500 ppm),
Butane (300 ppm), Heptane (500 ppm), Ethyl Acetate
(200 ppm), Isopropyl Alcohol (200 ppm) and Carbon
Dioxide (5000 ppm). Values measure gas and vapor
concentrations in parts per million.
Required Alarm Levels: Before 10% COHb exposure at
levels of 30% to 70% Relative Humidity (RH). 400 ppm
CO between 4 and 15 minutes;150 ppm CO between 10
and 50 minutes; 70 ppm CO between 60 and 240 min-
utes. The unit is designed not to alarm when exposed to
a constant level of 30 ppm for 30 days.
During Alarm: Repeating Horn Pattern: 4 beeps,
pause, 4 beeps, pause, until CO level falls below
70 ppm, silence button is pressed, or power is lost.
•Stand-alone unit: Red CO light (LED) flashes
once per second.
•Interconnected series: Red CO light (LED) flash-
es once per second on the initiating Alarm. Red
lights (LED) on all other Alarms will not flash.
Continued...

3
Specifications (continued)...
Standards: Underwriters Laboratories Inc. Single and
Multiple Station Carbon Monoxide Alarms UL2034.
According to Underwriters Laboratories Inc. UL2034,
Section 1-1.2: “Carbon monoxide alarms covered by
these requirements are intended to respond to the
presence of carbon monoxide from sources such as,
but not limited to, exhaust from internal-combustion
engines, abnormal operation of fuel-fired appliances,
and fireplaces. CO Alarms are intended to alarm at
carbon monoxide levels below those that could cause
a loss of ability to react to the dangers of Carbon
Monoxide exposure.”
This CO Alarm monitors the air, and is designed to
alarm before CO levels become life threatening. This
allows you precious time to leave the house and correct
the problem. This is only possible if Alarms are located,
installed, and maintained as described in this manual.
This CO Alarm is designed to alert you to a poten-
tially dangerous build-up of CO over time. It cannot
fix a CO problem, and it cannot identify a specific
source of CO. The company shall not be obligated
to pay for any carbon monoxide investigation or
service call conducted by a Fire Department, or
licensed investigator or repairman, arranged by the
homeowner in response to an alarm.
This product is intended for use in ordinary indoor
locations of family living units. It is not designed to
measure CO levels in compliance with Occupational
Safety and Health Administration (OSHA) commer-
cial or industrial standards. Individuals with medical
conditions may consider using warning devices
which provide audible and visual signals for carbon
monoxide concentrations under 30 ppm.
HOW YOUR SMOKE/CO ALARM WORKS
THE COVER OF YOUR SMOKE/CO ALARM
1. Test/Silence Button: Press and hold to
activate mode, or to silence the alarm.
2. POWER Light (GREEN)
SMOKE ALARM Light (RED)
3. CO ALARM Light (RED)
4. Air Vents
5. (Behind the Cover) Alarm Horn: 85db
audible alarm for test, alarm, and unit
malfunction warning.

4
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 tempera-
tures normally remain between 40˚F and 100˚F
(4˚C and 38˚C).
Recommended Placement
•When installing on the wall, the top edge of
Smoke/CO Alarms should be placed between
4 inches (102 mm) and 6 inches (152 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.
CHAPTER 2: INSTALLATION
WHERE TO INSTALL THIS ALARM
Minimum coverage for Smoke Alarms, as recom-
mended by the National Fire Protection Association
(NFPA), is one Smoke Alarm on every floor, in every
sleeping area, and in every bedroom (See Chapter 8
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 bed-
rooms. 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 20 feet (6 meters) away
from the furnace or fuel burning heat source where
possible. In smaller homes or in manufactured homes
and RV’s where this distance cannot be maintained,
install the Alarm as far away as possible from the fur-
nace or other fuel burning source. Installing the Alarm
closer than 20 feet will not harm the Alarm, but may
increase the frequency of nuisance alarms.

5
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 insula-
tion. 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.
SUGGESTED AREAS FOR INSTALLING
SMOKE ALARMS, CO ALARMS, AND COMBO UNITS
SMOKE ALARM WITH
SILENCE FEATURE
CO ALARMS
BOTH, OR COMBINATION
SMOKE/CO ALARMS
SMOKE ALARMS
KEY:
Suggested locations are based on
NFPA recommendations (NFPA 72
for Smoke Alarms and NFPA 720 for
Carbon Monoxide Alarms). Always
refer to national and local codes
before beginning any installation.
This combination Smoke/CO Alarm can be interconnected with all compatible
AC and AC/DC Smoke Alarms and other same-model Smoke/CO Alarms. It is
not recommended that you interconnect this Smoke/CO Alarm with other-
model AC or AC/DC CO Alarms.
In new construction AC and AC/DC smoke alarms MUST
be interconnected to meet NFPA recommendations.
RECOMMENDED PLACEMENT

6
AVOIDING DEAD AIR SPACES
“Dead air”spaces may prevent smoke from reaching
the Smoke/CO Alarm. To avoid dead air spaces, fol-
low installation recommendations:
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.
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 require-
ments for sloped or
peaked ceilings.
For wall mounting (if allowed by building codes), the
top edge of Smoke/CO Alarms should be placed
between 4 inches (102 mm) and 6 inches (152 mm)
from the wall/ceiling line, below typical “dead air”
spaces. NOTE: Position the battery drawer, marked
“THIS SIDE UP”, so it faces the ceiling.
WHERE NOT TO INSTALL THIS ALARM
Do NOT locate this Smoke/CO Alarm:
•In garages, kitchens, furnace rooms, crawl spaces
and unfinished attics. Avoid extremely dusty, dirty
or greasy areas.
•Where combustion particles (formed when some-
thing burns) are produced. Avoid poorly ventilated
kitchens, garages, and furnace rooms. Keep this
Smoke/CO Alarm at least 20 feet (6 meters) from
a furnace or other fuel burning heat source, or fuel
burning appliances (water heater, stove, vehicle,
furnace) whenever possible.
•Within 5 feet 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, like near ceiling fans or open
windows. Blowing air may prevent CO or smoke
from reaching the sensors.
•Where the temperatures are regularly below 40˚F
(4˚C) or above 100˚F (38˚C) including unheated
buildings, outdoor rooms, porches, or unfinished
attics or basements. Extreme temperatures may
shorten component or battery life.
•In insect infested areas. Insects can clog the
openings to the sensing chamber.
•Less than 12 inches (305 mm) away from
fluorescent lights. Electrical “noise”can interfere
with the sensor.

7
IMPORTANT INSTALLATION PARTS
The Mounting Bracket:
To remove the mounting
bracket from the
Smoke/CO Alarm base,
hold the alarm base firmly
and twist the mounting
bracket off. The mounting
bracket installs onto the
junction box. It has a vari-
ety of screw slots to fit
most boxes.
The Power Connector: The power
connector plugs into a power input block
on the Smoke/CO Alarm. It supplies the
unit with AC power.
•The black wire is “hot.”
•The white wire is neutral.
•The white/gray stripe wire is used for
interconnect.
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 first may result in serious
electrical shock, injury or death.
If you need to remove the power connector, 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.
LOCKING FEATURES
The locking features are designed to prevent
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.
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 or utility
knife •Standard/Flathead 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 mount-
ing bracket, depend-
ing on how many
locking features you
want to use.
To permanently remove either lock, insert a flathead
screwdriver between the locking pin and the lock,
and pry the pin out of the lock.
Locking Pin

8
TO LOCK THE BATTERY COMPARTMENT
This step should not be done until installation is
complete and AC power can be turned on as soon
as possible to conserve battery power. Activate the
battery and test the battery back-up before locking
the battery compartment.
1. Activate the battery back-up by
removing the “Pull to Activate
Battery Back-Up”tab.
2. Push and hold Test/Silence
button until the alarm sounds.
If the unit does not alarm during testing, install a
new battery and test again. If the alarm still does
not sound, replace it immediately.
3. Using needle-nose pliers
or a utility knife, detach one
locking pin from the mount-
ing bracket.
4. 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.
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 first 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 Smoke/CO Alarm.
3. Insert a flathead 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 drawer and reinsert locking pin in lock.
Continued ...

9
Unlock the Battery Compartment (continued)...
5. Reconnect the power connector to the back of
the Alarm, reattach the Alarm to the mounting
bracket, and restore the power as soon as possible
to conserve battery power.
When replacing the battery, always test the Alarm
after relocking the battery compartment.
TO LOCK THE MOUNTING BRACKET
1. Using needle-nose
pliers, detach one
locking pin from the
mounting bracket.
2. Insert the locking pin into the lock located on the
pivoting hinge of the battery drawer.
3. When you attach the Alarm to the mounting brack-
et, the locking pin’s head will fit into a notch on the
bracket.
TO UNLOCK THE MOUNTING BRACKET
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 first may result in serious
electrical shock, injury or death.
Always discharge the branch circuit before servic-
ing 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 button for 5-10
seconds to discharge the branch circuit.
1. Insert a flathead
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 counter-
clockwise (left) at the same time.
3. To remove the lock,
insert a flathead
screwdriver between
the locking pin and
the lock, and pry the
pin out of the lock.

10
HOW TO INSTALL THIS ALARM
This unit is designed to be mounted on an standard
wiring junction box up to a 4-inch size on either the
ceiling or wall. Read “Where to Install Alarms”and
Where Not to Install Alarms”before you begin installa-
tion. If a junction box is not already in place, install
one using standard #12 or #14 gauge solid copper
(wire) Appliance Wiring Material (AWM).
The Parts Of This Unit
INSTALLING A SINGLE (STAND-ALONE) ALARM
Tools you will need: Standard/Flathead screwdriver.
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.
To install this unit, follow these steps:
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.
•Connect the White wire on the power connector
to the neutral (White) wire in the junction box.
•Connect the Black wire on the power connector
to the hot wire (Black) in the junction box.
•Tuck the White/Gray Stripe wire inside the
junction box. It is used for interconnect only.
3. Plug the power connector into the
back of the Smoke/CO Alarm.
4. Position the base of the Alarm
over the mounting bracket and
turn. The Alarm can be positioned
over the bracket every 60º. Turn
the Alarm clockwise (right) until
the unit is in place.
NOTE: For Wall Mounting,
position the battery drawer, marked “THIS SIDE
UP”, so it faces the ceiling.
5. If you are only installing one unit, restore power to
the junction box.
Continued ...
1
2
3
2
9
8
7
3
5
6
4
1. Mounting Bracket
2. Mounting Slots
3. Locking Pins (Break
Out Bracket
4. Hot (Black) Wire
5. Neutral (White)
AC Wire
6. White/Gray Stripe
Interconnect Wire
7. Latch to Open Battery
Compartment
8. Swing-Out Battery
Compartment
9. Quick-Connect Power
Connector

11
Installing a Single (Stand-Alone) Alarm (continued)...
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.
Make sure the unit is receiving AC power. Under nor-
mal operation, the Green power indicator light will
shine continuously.
If the Green power indicator light does not light,
TURN OFF POWER TO THE JUNCTION BOX and
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.
INTERCONNECTING MULTIPLE ALARMS
Interconnected units can provide earlier warning of
fire or CO than stand-alone units, especially if the
incident starts in a remote area of the dwelling. If any
unit in the series alarms, all units will alarm.
To determine which Alarm initiated an alarm, see table:
On Initiating Alarms Red LED(s) Flashes Rapidly
On All Other Alarms Red LED is Off
All wiring must conform to all local electrical codes
and Article 760 of the National Electrical Code (NFPA
70). Refer to NFPA 72, Chapter 2 and/or your local
building code for further connection requirements.
Continued ...
Interconnecting Multiple Alarms (continued)...
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 smoke
alarms will not operate.
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: BRK
Electronics
®
Smoke Alarm Models SC6120B, 4120,
4120B, 4120SB, 4919, 2002RAC, 100S, 5919, 5919TH;
BRK Electronics
®
Heat Alarm Models HD6135F,
HD6135FB; BRK Electronics
®
CO Alarm Models
SC6120B; and First Alert
®
Smoke Alarm Models
SA4120B, SA4121B, SA4919B, SA100B.
NOTE: In case of fire or smoke, all compatible
models listed above will alarm. In response to a carbon
monoxide situation, only the combination Smoke/CO
Alarm will alarm.
Interconnected units must meet ALL of the
following requirements:
•A maximum of 18 Alarms may be
interconnected. (Maximum of 12 can be
Smoke Alarms)
•The same fuse or circuit breaker must power all
interconnected units.
Continued ...

12
Interconnecting Multiple Alarms (continued)...
•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.
Failure to meet any of the above requirements
could damage the units and cause them to mal-
function, removing your protection.
Interconnecting Multiple Smoke/CO Alarms
6
7
8
4
3
1
54
3
1
5
2
AB
}}
A Unswitched 120V AC
60 Hz Source
B To Additional Units
Maximum = 18 (Max.
12 Smoke Alarms)
1 Smoke/CO Alarm
2 Ceiling or Wall
3 Power Connector
4 Wire Nut
5 Junction Box
6 Neutral (White) AC Wire
7 Interconnect Wire
(White/Gray Stripe)
8 Hot (Black) AC Wire
Interconnecting Multiple Alarms (continued)...
1. Remove mounting bracket from the base. Position
screw slots on mounting bracket over screws in the
junction box. Tighten screws.
2.
Strip off about 1/2”(12 mm) of the plastic coating on
the white/gray stripe wire on the power connector.
3. Using wire nuts, connect the power connector to
the household wiring.
•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 white/gray stripe wire on the
power connector to the interconnect wire in
the junction box. Repeat for each unit you are
interconnecting.
4. Plug power connector into the back of the Alarm.
5. Position the base of the Alarm over the mounting
bracket and turn. The Alarm can be positioned over
the bracket every 60°. Turn the unit clockwise
(right) until the unit is in place. NOTE: For Wall
Mounting, position the battery drawer, marked
“THIS SIDE UP”, so it faces the ceiling.
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.
6. Make sure each unit is receiving AC power. Under
normal operation, the Green power indicator light
will shine continuously.
Continued ...

13
Interconnecting Multiple Alarms (continued)...
7. 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.
NOTE: When power is applied, unit(s) may alarm
momentarily.
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.
ACTIVATE THE BATTERY BACK-UP
Activate the battery
back-up by removing
the “Pull to Activate
Battery Back-Up”
tab. You do not need
to open the battery
compartment and
reposition the battery
during installation.
Once you remove the battery tab, test the battery
back-up. Press and hold the Test/Silence button on
the cover until the alarm sounds. Turn on AC power
as soon as possible to conserve battery.

14
CHAPTER 3: IF YOUR SMOKE/CO ALARM SOUNDS
WHAT TO DO FIRST–IDENTIFY THE
TYPE OF ALARM
Type of Alarm What You See and Hear
Carbon Monoxide CO Light:
(CO) Flashing RED
Horn: 4 beeps,
pause, 4 beeps,
pause
Smoke Smoke Light:
Flashing RED
Horn: 3 beeps,
pause, 3 beeps,
pause
WHAT TO DO IF CARBON MONOXIDE
IS DETECTED
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 SOUNDS:
1. Operate the Test/Silence button.
2. Call your emergency services, fire department or
911. Write down the number of your local emer-
gency 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 reacti-
vates within a 24-hour period, repeat steps 1-3
and call a qualified appliance technician to investi-
gate for sources of CO from fuel-burning equip-
ment and appliances, and inspect for proper
operation of this equipment. If problems are iden-
tified 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 qualified
appliance technician here:
Finding the Source of CO After an Alarm
Because CO may dissipate by the time an investiga-
tor arrives, it may be difficult to locate the source of
CO. See “What You Need to Know About CO.”BRK
Brands, Inc. shall not be obligated to pay for any
carbon monoxide investigation or service call.
“ALARM-MOVE
TO FRESH AIR”
If you hear the alarm horn
sound 4 beeps, pause, 4 beeps,
pause, and the RED CO light is
flashing, move everyone to a
source of fresh air.

15
WHAT TO DO IF SMOKE IS DETECTED
RESPONDING TO AN ALARM
•Don’t panic; stay calm. Follow your family escape
plan. Your safe escape may depend on thinking
clearly and remembering what you have prac-
ticed. 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 to see if they are hot. If a door is
cool, open it slowly.
•Don’t open a hot door—use an alternate escape
route.
•Stay close to the floor. Smoke and hot gases rise.
•Keep doors and windows closed, unless you need
to escape through them.
•Meet at your planned meeting place outside your
home, and do a head count to make sure every-
one 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 more ideas on
making your home safer and on creating your own
family escape plan.
NEVER ignore any alarm. Ignoring the alarm may
result in injury or death. If the unit alarms and you
are not absolutely certain of the source of the
smoke, get everyone out of the house immediately.
If the unit alarms and you are certain that the source
of smoke is not a fire—cooking smoke or an extreme-
ly dusty furnace, for example—use the Silence
Feature to quiet the alarm, or open a nearby window
or door and fan the smoke away from the unit. In
most cases this will silence the alarm, and once the
smoke clears the unit will reset automatically.
If you hear the alarm horn sound
3 beeps, pause, 3 beeps, pause
and the RED SMOKE light is
flashing, smoke has been
detected. Evacuate everyone
from the building.

16
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 fire.
To use the Silence Feature, briefly press the
Test/Silence button on the cover of the
Smoke/CO Alarm.
To silence Alarms in an interconnected series:
To silence all the Alarms in an interconnected series,
you must press the Test/Silence button on the unit(s)
that triggered the alarm.
NOTE: The red light on the initiating Alarms will flash
rapidly. The red light will be off on all other Alarms.
Never interrupt AC power or remove the battery to
quiet an unwanted alarm. Disabling the Alarm
removes your protection.
WHEN THE SMOKE ALARM IS SILENCED...
The Smoke Alarm will remain silent for up to 15
minutes and then return to normal operation. If the
smoke has not cleared within the silence period or if
smoke increases to a critical level during the silence
period, the unit will go back into alarm.
Use the Silence Feature only if you are certain of
the source of smoke. If you are not certain of the
source or a fire starts while you are clearing
smoke, evacuate the house immediately.
WHEN THE CO ALARM IS SILENCED...
The CO Alarm will remain silent for 4 minutes.
After 4 minutes, if CO levels remain potentially
dangerous the horn will start sounding again.
The Silence Feature is intended to temporarily silence
the Alarm horn. It will not correct a CO problem.
LOW BATTERY SILENCE FEATURE
If AC power is on, briefly press the Test/Silence button
to silence the low battery “chirp”for up to 8 hours.
The Alarm will continue to operate as long as AC
power is supplied. However, replace the battery as
soon as possible, to maintain protection in event of a
power outage.
USING THE SILENCE FEATURE

17
The Latching Alarm Indicator is activated after an
Alarm is exposed to alarm levels of smoke or carbon
monoxide. After smoke or CO levels drop below alarm
levels, the red smoke or CO LED will begin to flash
once every 5 seconds. For example, if CO initiated
the alarm, the red “CO”LED will flash. If the Smoke
Alarm initiated the alarm, the red “SMOKE”LED will
flash. It will continue to flash or “latch”until you clear
it using the Test/Silence button.
This feature helps emergency responders, investiga-
tors, 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.
Non-Interconnected or Stand-Alone Alarm
Latching Alarm Indicator shows that the unit was
exposed to alarm levels of smoke or CO.
Interconnected Alarms
Latching Alarm Indicator shows which Alarm(s) in the
series were exposed to alarm levels of smoke or car-
bon 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 CO or smoke
present in the air has dropped below alarm levels.
GARAGE
BEDROOM
BEDROOM
HALL
LIVING ROOM
KITCHEN
BASEMENT
BEDROOM
LATCHING ALARM:
Unit was exposed
to alarm levels of Smoke
or CO
LATCHING NOT ACTIVATED:
Unit was not exposed
to alarm levels of Smoke
or CO
KEY:
THE “LATCHING ALARM”INDICATOR:

18
CHAPTER 4: TESTING AND MAINTENANCE
WEEKLY TESTING
•SMOKE ALARM: NEVER use an open flame of
any kind to test the Smoke Alarm. You might
accidentally damage or set fire to the unit or to
your home. The built-in test switch accurately
tests the unit’s operation as required by
Underwriters Laboratories, Inc. (UL). If you
choose to use an aerosol smoke product to test
the Smoke Alarm, be certain to use one that has
been Listed to Underwriters Laboratories, Inc.
Safety Standards, and use it only as directed.
Use of non-UL Listed products or improper use
of UL Listed products may affect the smoke
alarm’s sensitivity.
•CO ALARM: NEVER use vehicle exhaust to test
the CO Alarm. Exhaust may cause permanent
damage and voids your warranty.
DO NOT stand close to the Alarm when the horn is
sounding. Exposure at close range may be harmful
to your hearing. When testing, step away when
horn starts sounding.
It is important to test this unit every week to make
sure it is working properly. Using the Test/Silence
button is the recommended way to test this Alarm.
1.
Push and hold 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 flashes. Then you will hear a loud,
repeating horn pattern: 4 beeps, pause, 4 beeps,
pause, while the red CO LED flashes.
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.
If there is still a problem, do not try to fix the Alarm
yourself. This will void your warranty!