BRK electronic Smoke Alarm 4120 AC User Manual

USER’S MANUAL  
SMOKE ALARMS  
Smoke particles of varying number and size are  
produced in all fires.  
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 is generally more  
sensitive than ionization technology at detect-  
ing 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.  
AC Powered Ionization Smoke Alarm with  
Battery Back-Up and Silence Feature  
Cats. 4120SB, 4120SAB  
Input: 120V AC, 60Hz, 0.05A  
AC Powered Ionization Smoke Alarm  
with Battery Back-Up  
For maximum protection, use both types of smoke  
alarms on each level of your home.  
Cats. 4120B, 4120AB  
Input: 120V AC, 60Hz, 0.05A  
AC Powered Ionization Smoke Alarm  
Cat. 4120  
Input: 120V AC, 60Hz, 0.05A  
Models  
4120SB, 4120B, 4120  
M06-2016-008 08/01  
 
WHERE TO INSTALL SMOKE ALARMS  
INSTALLING SMOKE ALARMS IN SINGLE-FAMILY AND MULTI-FAMILY RESIDENCES  
The National Fire Protection Association (NFPA), recommends one Smoke Alarm on every floor, in every sleeping  
area, and in every bedroom. In new construction, the Smoke Alarms must be AC powered and interconnected. See  
Agency Placement Recommendations” for details. For additional coverage, it is recommended that you install a  
Smoke Alarm in all rooms, halls, storage areas, finished attics, and basements, where temperatures normally  
remain between 40˚F (4˚C) and 100˚F (38˚C). Make sure no door or other obstruction could keep smoke from reach-  
ing the Smoke Alarms.  
KEY:  
REQUIRED TO MEET  
DINING ROOM  
KITCHEN  
BEDROOM  
NFPA RECOMMENDATIONS  
BEDROOM  
BEDROOM  
KITCHEN  
HALL  
RECOMMENDED FOR  
ADDITIONAL PROTECTION  
LIVING ROOM  
SMOKE ALARMS WITH SILENCE  
FEATURES RECOMMENDED FOR  
ADDITIONAL PROTECTION  
LIVING ROOM  
BEDROOM  
INTERCONNECTED AC OR  
AC/DC SMOKE ALARMS  
FINISHED BASEMENT  
SINGLE-STORY RESIDENCE, APARTMENT,  
MOBILE HOME  
MULTI-STORY RESIDENCE  
KEY:  
REQUIRED TO MEET  
BEDROOM  
NFPA RECOMMENDATIONS  
BEDROOM  
HALL  
BEDROOM  
KITCHEN  
DINING ROOM  
LIVING ROOM  
KITCHEN  
RECOMMENDED FOR  
ADDITIONAL PROTECTION  
LIVING ROOM  
SMOKE ALARMS WITH SILENCE  
FEATURES RECOMMENDED FOR  
ADDITIONAL PROTECTION  
BEDROOM  
FINISHED BASEMENT  
SINGLE-STORY RESIDENCE, APARTMENT,  
MOBILE HOME  
MULTI-STORY RESIDENCE  
1
 
More specifically, install Smoke Alarms:  
National Fire Protection Association, One Batterymarch  
Park, Quincy, MA 02269-9101. Additional local build-  
ing and regulatory codes may apply in your area.  
Always check compliance requirements before  
beginning any installation.  
• 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 12 meters long  
(40 feet), install a unit at each end.  
• At the top of the first-to-second floor stairway,  
and at the bottom of the basement stairway.  
Smoke Alarms Recommended In Hotels, Motels,  
Hospitals, Extended Care Facilities  
Install stand-alone (non-interconnected) AC powered  
Smoke Alarms with battery back-up for maximum  
protection in each sleeping room.  
INDIVIDUAL ROOMS  
Specific requirements for Smoke Alarm installation  
vary from state to state and from region to region.  
Check with your local Building Inspector and/or Fire  
Department for current requirements in your area. If  
you install AC or AC/DC units, it is recommended  
(and may be required) they be interconnected for  
added protection.  
LOBBY  
HALLWAY  
RECOMMENDED STAND-ALONE  
(NON-INTERCONNECTED)SMOKE ALARMS  
AGENCY PLACEMENT  
RECOMMENDATIONS  
NFPA 72 (National Fire Code)  
Installing Smoke Alarms in Mobile Homes  
For minimum security install one Smoke 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. Smoke  
Alarms should be installed where temperatures normal-  
ly remain between 40˚F (4˚C) and 100˚F (38˚C).  
Smoke Alarms shall be installed in each separate sleep-  
ing room, outside each sleeping area in the immediate  
vicinity of the bedrooms and on each additional story of  
the family living unit, including basements and exclud-  
ing crawl spaces and unfinished attics.  
In new construction, Alarms shall be so arranged that  
operation of any one Alarm shall cause the operation of  
all Alarms within the dwelling.  
This equipment should be installed in accordance with  
NFPA (National Fire Protection Association) 72 and 101.  
Smoke Detection-Are More Smoke Alarms Desirable?  
The required number of Smoke Alarms might not pro-  
2
 
vide reliable early warning protection for those areas  
separated by a door from the areas protected by  
the required Smoke Alarms. For this reason, it is  
recommended that the householder consider the use of  
additional Smoke Alarms for those areas for increased  
protection. The additional areas include the basement,  
bedrooms, dining room, furnace room, utility room, and  
hallways not protected by the required smoke alarms.  
The installation of Smoke Alarms in kitchens, attics  
(finished or unfinished), or garages is not normally  
recommended, as these locations occasionally experi-  
ence conditions that can result in improper operation.  
California State Fire Marshal (CSFM)  
Early warning detection is best achieved by the  
installation of fire detection equipment in all rooms and  
areas of the household as follows: A Smoke Alarm  
installed in each separate sleeping area (in the vicinity,  
but outside bedrooms), and Heat or Smoke Alarms in  
the living rooms, dining rooms, bedrooms, kitchens,  
hallways, finished attics, furnace rooms, closets, utility  
and storage rooms, basements, and attached garages.  
WHERE NOT TO INSTALL SMOKE ALARMS  
For best performance, do not install the unit:  
• In very dusty, dirty, or greasy areas. Do not  
install a smoke alarm directly over the stove or  
range. Clean a laundry room unit frequently to  
keep it free of dust or lint.  
• 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. Ventilate these  
areas as much as possible.  
• Near fresh air vents, ceiling fans, or in very  
drafty areas. Drafts can blow smoke away  
from the unit, preventing it from reaching the  
sensing chamber.  
• In insect infested areas. Insects can clog  
openings to the sensing chamber and cause  
unwanted alarms.  
• In air streams near kitchens. Air currents can  
draw cooking smoke into the sensing chamber  
of a smoke alarm near the kitchen.  
• Less than 12 inches (305 mm) away from  
fluorescent lights. Electrical “noise” can interfere  
with the sensor.  
• In very damp, humid or steamy areas, or directly  
near bathrooms with showers. Keep units at  
least 10 feet (3 meters) away from showers,  
saunas, dishwashers, etc.  
• In dead air” spaces. “Dead air” spaces may  
prevent smoke from reaching the smoke alarm.  
• 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.  
3
 
AVOIDING DEAD AIR SPACES  
Dead air” spaces may prevent smoke from reach-  
ing the Smoke Alarm. To avoid dead air spaces,  
follow the installation recommendations below.  
FOR STANDARD, FLAT CEILINGS  
Best Location  
4"  
4"  
(center of ceiling)  
Acceptable  
Location  
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.  
Do not install top of  
Dead Air Spaces  
(4" or 102 mm)  
smoke alarm lower than  
12" (305 mm) from the  
wall/ceiling line  
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.  
FOR SLOPED CEILINGS  
(i.e. great rooms, condominiums, dormers)  
On a peaked, gabled, or cathedral ceiling, install  
the first 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.  
Install first  
smoke alarm  
in this target area  
3 ft  
(0.9m)  
If required,  
install additional  
smoke alarms  
along the slope.  
FOR PEAKED CEILINGS  
(i.e. Cathedral ceilings, A-frames)  
Install first  
smoke alarm  
in this target area  
If required,  
3 ft  
(0.9m)  
install additional  
smoke alarms  
along the slope.  
4
 
IMPORTANT! READ BEFORE YOU INSTALL THIS SMOKE ALARM  
Read Where To Install Smoke Alarms” and Where  
Not To Install Smoke Alarms” before beginning. This  
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 inter-  
rupter. Failure to connect this unit to a 24-hour circuit  
may prevent it from providing constant protection.  
unit monitors the air, and when smoke reaches its  
sensing chamber, it alarms. It can give you more time  
to escape before fire spreads. This unit can ONLY  
give an early warning of developing fires if it is  
installed, maintained and located where smoke can  
reach it, and where all residents can hear it, as  
described in this manual. This unit will not sense gas,  
heat, or flame. It cannot prevent or extinguish fires.  
This Smoke Alarm must have AC or battery power  
to operate.  
On Models 4120SB and 4120B Only:  
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.  
If the AC power fails, battery back-up will allow the  
alarm to sound for at least 4 minutes. If AC power  
fails and the battery is weak, protection should last  
for up to 7 days. If AC power fails and the battery is  
dead or missing, the alarm cannot operate.  
This unit will not alert hearing impaired residents. It  
is recommended that you install special units which  
use devices like flashing strobe lights to alert hear-  
ing impaired residents.  
It is possible an electrical fire could occur on the  
circuit powering this unit. If this happened, the power  
to the unit could be cut off and it may fail to alarm.  
Some safety experts recommend wiring warning  
devices like this unit on separate circuits from other  
appliances, since these circuits are not as likely to be  
overloaded. Other safety experts recommend wiring  
these units on the same circuits as appliances so it is  
more readily apparent if the circuit fails. Whichever  
circuit you choose, it is recommended you also install  
battery powered units as back-ups in case of fire on  
the circuit powering the AC powered units.  
Installation of this unit must conform to the electri-  
cal 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 installa-  
tion must be performed by a licensed electrician.  
Failure to follow these guidelines may result in injury  
or property damage.  
Continued...  
5
 
Read Before You Install This Smoke Alarm (continued)...  
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 auto-  
matically 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.  
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. When testing the unit, step back when the  
horn starts sounding.  
Do not paint over the unit. Paint may clog the  
openings to the sensing chamber and prevent the  
unit from operating properly.  
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 auxil-  
iary device. Connecting anything else to this unit  
may damage it or prevent it from operating properly.  
On Models 4120SB and 4120B Only:  
The battery compartment will not close unless a  
battery is installed. This warns you the unit will not  
operate under DC power without a battery.  
UNDERSTANDING THE INDICATOR LIGHTS AND ALARM HORN PATTERNS  
Normal Operation  
Test Condition  
Alarm Condition*  
(Initiating Unit)  
AC Power  
4120SB, 4120B, 4120  
Constant Green LED  
Flashing Red LED  
No Audible Alarm  
Constant Green LED  
Rapidly Flashing LED  
Audible Alarm  
Constant Green LED  
Rapidly Flashing Red LED  
Audible Alarm  
Green LED Off  
Flashing Red LED  
No Audible Alarm  
Green LED Off  
Rapidly Flashing LED  
Audible Alarm  
Green LED Off  
Rapidly Flashing LED  
Audible Alarm  
DC Power  
4120SB, 4120B  
NOTE: When power is applied, unit(s) may alarm momentarily.  
*When any Smoke Alarm in an interconnected series triggers an alarm, its red LED will flash rapidly. The red LEDs will  
remain OFF on any remaining alarms in the series. This feature helps responders identify which unit(s) triggered the alarm.  
6
 
IMPORTANT INSTALLATION PARTS  
LOCKING FEATURES  
The Mounting Bracket:  
To remove the mounting  
bracket from the Smoke  
Alarm base, hold the  
Smoke Alarm base firmly  
and twist the mounting  
bracket off. The mounting  
bracket installs onto the  
junction box. It has a  
variety of screw slots to  
fit most boxes.  
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 Smoke Alarms have two separate locking  
features: one to lock the battery compartment, and  
the other to lock the Smoke 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.  
The Power Connector: The power  
connector plugs into a power input  
block on the Smoke Alarm. It supplies  
the unit with AC power.  
Both locking features use  
locking pins, which are  
molded into the mounting  
Locking Pin  
bracket. Using needle nose  
pliers or a utility knife,  
remove one or both pins  
from the mounting bracket,  
depending on how many  
locking features you want  
to use.  
• 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, 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.  
To permanently remove either lock insert a flat-  
head screwdriver between the locking pin and the  
lock, and pry the pin out of the lock.  
7
 
To Lock The Battery Compartment  
(Models 4120B and 4120SB Only)  
To Unlock The Battery Compartment  
(Models 4120B and 4120SB Only)  
Once the Smoke Alarm is installed, you must  
disconnect it from the AC power before unlocking  
the battery compartment.  
Do not lock the battery compartment until you have  
activated the battery and tested the battery back-up.  
1. Activate the battery  
back-up by removing  
the “Pull to Activate  
Battery Back-Up” tab.  
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 first may result in  
serious electrical shock, injury or death.  
2. Push and hold test  
button until the alarm  
sounds: 3 beeps, pause,  
3 beeps, pause.  
If the unit does not alarm during testing, DO NOT  
lock the battery compartment! Install a new  
battery and test again. If the Smoke Alarm still  
does not alarm, replace it immediately.  
Always discharge the branch circuit before servicing  
an AC or AC/DC Smoke Alarm. First, turn off the AC  
power at the circuit breaker or fuse box. Next,  
remove the battery from Smoke Alarms with battery  
back-up. Finally, press and hold the test button for  
5-10 seconds to discharge the branch circuit.  
1. Remove the Smoke Alarm from the mounting  
bracket. If the unit is locked to the bracket, see  
the section “To Unlock the Mounting Bracket.”  
3. Using needle-nose pliers  
or a utility knife, detach  
one locking pin from the  
mounting bracket.  
4. Push the locking pin  
through the black dot on  
the label on the back of  
the Smoke Alarm.  
2. Disconnect the power connector by gently prying  
it away from the back of the Smoke Alarm.  
3. Insert a flathead screw-  
driver under the head of  
the locking pin, and gen-  
tly pry it out of the bat-  
tery compartment lock.  
(If you plan to relock the  
battery compartment,  
save the locking pin.)  
8
 
To Unlock the Battery Compartment (continued)...  
To Unlock The Mounting Bracket  
4. To relock the battery compartment, close the  
battery door and reinsert locking pin in lock.  
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 first may result in  
serious electrical shock, injury or death.  
5. Reconnect the power connector to the back of  
the Smoke Alarm, reattach the Smoke Alarm to  
the mounting bracket, and restore the power.  
When replacing the battery, always test the Smoke  
Alarm before relocking the battery compartment.  
Always discharge the branch circuit before servicing  
an AC or AC/DC Smoke Alarm. First, turn off the AC  
power at the circuit breaker or fuse box. Next,  
remove the battery from Smoke Alarms with battery  
back-up. Finally, press and hold the test button for  
5-10 seconds to discharge the branch circuit.  
To Lock The Mounting Bracket:  
1. Using needle-nose  
pliers, detach one  
locking pin from the  
mounting bracket.  
1. Insert a flathead  
screwdriver between the  
mounting bracket pin and  
the mounting bracket.  
2. Insert the locking pin into the lock located on the  
pivoting hinge of the battery door.  
2. Pry the Smoke Alarm away from the bracket by  
turning both the screwdriver and the Smoke  
Alarm counterclockwise (left) at the same time.  
3. When you attach the Smoke Alarm to the mount-  
ing bracket, the locking pin’s head will fit into a  
notch on the bracket.  
9
 
HOW TO INSTALL THIS SMOKE ALARM  
This unit is designed to be mounted on any standard  
wiring junction box up to a 4-inch size, on either the  
ceiling or wall. Read Where to Install Smoke Alarms”  
and Where Not To Install Smoke Alarms” before you  
begin installation. If a junction box is not already in  
place, install one using standard #12 or #14 gauge  
solid copper Appliance Wiring Material (AWM).  
1
3
2
2
6
BATTERY BACK-UP ON  
MODELS 4120SB AND 4120B ONLY:  
3
4
5
7
8
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.  
9
The Parts of This Unit  
1
2
3
4
5
6
7
8
9
Mounting Bracket  
Mounting Slots and Screws  
Locking Pins (break out of bracket)  
Hot (Black) AC Wire  
Neutral (White) AC Wire  
Interconnect Wire  
When the battery is activated, the red light will  
shine continuously for 5-10 seconds, then begin to  
flash about once a minute.  
Latch to Open Battery Compartment  
Swing-Out Battery Compartment  
Quick-Connect Power Connector  
Test the battery back-up. Press and hold the test  
button on the cover until the alarm sounds.  
10  
 
4. Position the base of the Smoke Alarm over the  
mounting bracket and turn. The Alarm can be posi-  
tioned over the bracket every 60°. Turn the Smoke  
Alarm clockwise (right) until the unit is in place.  
INSTALLING A SINGLE (STAND-ALONE)  
SMOKE ALARM  
Tools you will need: Standard/Flathead screwdriver.  
5. If you are only installing one unit, restore power to  
the junction box.  
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.  
ELECTRICAL SHOCK HAZARD. Do not restore  
power until all Smoke Alarms are completely  
installed. Restoring power before installation is  
complete may result in serious electrical shock,  
injury or death.  
To install this unit, follow these steps:  
1. Remove the mounting bracket from the base, and  
attach it to the junction box.  
6. Make sure the unit is receiving AC power. Under  
normal operation, the Green power indicator light  
will shine continuously.  
2. Using wire nuts, connect the power connector to  
the household wiring.  
7. 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.  
• 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.  
3. Plug the power connector  
into the back of the  
Smoke Alarm.  
Model 4120SB Only: During installation, if you  
accidentally press the Silence button, the alarm will  
“chirp” once a minute for up to 15 minutes and the Test  
feature will be temporarily disabled. This is normal.  
The chirping” will stop once the alarm returns to  
normal operation.  
11  
 
INTERCONNECTING MULTIPLE SMOKE ALARMS  
Interconnected units can provide earlier warning of fire  
than stand-alone units, especially if a fire starts in a  
remote area of the dwelling. If any unit in the series sens-  
es smoke, all units will alarm. To determine which smoke  
alarm initiated an alarm, see table:  
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 100S,  
2002RAC, 4120, 4120B, 4120SB, 4919, 5919,  
5919TH, RM3 (Relay Module); BRK Electronics®  
Heat Alarm Model HD6135F; and First Alert® Smoke  
Alarm Models SA4120B, SA4121B, SA4919B, SA86B,  
SA100B.  
On Intiating Alarms  
On All Other Alarms  
Red LED(s) flashes(flash) rapidly  
Red LED is Off  
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.  
Interconnected units must meet ALL of the  
following requirements:  
• A maximum of 18 compatible units may be  
interconnected (Maximum of 12 smoke alarms).  
AC and AC/DC Smoke Alarms can be intercon-  
nected. Under AC power, all units will alarm when  
one senses smoke. When power is interrupted,  
only the AC/DC units in the series will continue to  
send and receive signals. AC powered Smoke  
Alarms will not operate.  
• 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.  
Interconnect units within a single family residence  
only. Otherwise all households will experience  
unwanted alarms when you test any unit in the series.  
Failure to meet any of the above requirements  
could damage the units and cause them to  
malfunction, removing your protection.  
12  
 
Interconnecting Multiple Smoke Alarms  
• 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.  
6
7
8
B
A
}
}
5
4
3
5
4
3
2
4. Plug the power connector into the back of the  
Smoke Alarm.  
5. Position the base of the Smoke 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.  
1
1
A
Unswitched 120V AC  
60 Hz Source  
4
5
Wire Nut  
B
To Additional Units  
Maximum = 18 (Max.  
12 Smoke Alarms)  
Junction Box  
ELECTRICAL SHOCK HAZARD. Do not restore power  
until all Smoke Alarms are completely installed.  
Restoring power before installation is complete may  
result in serious electrical shock, injury or death.  
1
2
3
Smoke Alarm  
6
7
8
Neutral (White) AC Wire  
Interconnect Wire  
6. Make sure each unit is receiving AC power. Under  
normal operation, the Green power indicator light  
will shine continuously.  
Ceiling or Wall  
Power Connector  
Hot (Black) AC Wire  
To install and interconnect multiple alarms:  
7. Test each Smoke 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.  
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 orange wire on the power connector.  
NOTE: When power is applied, unit(s) may alarm  
momentarily.  
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.  
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.  
• Connect the black wire on the power connector  
to the hot wire in the junction box.  
13  
 
When testing a series of interconnected units you  
must test each unit individually. Make sure all units  
alarm when each one is tested.  
Model 4120SB Only: During installation, if you  
accidentally press the Silence button, the alarm will  
“chirp” once a minute for up to 15 minutes and the  
Test feature will be temporarily disabled. This is  
normal. The chirping” will stop once the alarm  
returns to normal operation.  
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.  
TESTING AND MAINTENANCE  
WEEKLY TESTING  
• Gently vacuum off any dust on the cover at  
least once a month using your vacuum’s soft  
brush attachment. Test the unit after vacuuming  
the cover.  
• Never use water, cleaners or solvents since they  
may damage the unit.  
• Relocate the unit if it sounds frequent unwanted  
alarms. See Where Not To Install Smoke  
Alarms” for details.  
Models 4120SB and 4120B Only: When the  
battery back-up becomes weak, the Smoke  
Alarm will chirp” about once a minute (the low  
battery warning). This warning should last 7  
days, but you should replace the battery imme-  
diately to continue your protection.  
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. 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.  
Models 4120SB and 4120B Only:  
Choosing a replacement battery:  
It is important to test this unit every week to make  
sure it is working properly. Using the test button is  
the recommended way to test this Smoke Alarm.  
Press and hold the test button on the cover of the unit  
until the alarm sounds (the unit may continue to alarm  
for a few seconds after you release the button). If it  
does not alarm, make sure the unit is receiving power  
and test it again. If it still does not alarm, replace it  
immediately. During testing, you will hear a loud,  
repeating horn pattern:  
Your Smoke Alarm’s battery back-up requires one stan-  
dard 9V battery. The following batteries are acceptable  
as replacements. This list supplements the list on the  
Smoke Alarm battery door: Eveready #216, #522  
(Energizer), #1222; Duracell #MN1604, MX1604 (Ultra);  
Gold Peak #1604P, #1604S; Rayovac 1604, D1604. You  
may also use a Lithium battery like the Ultralife U9VL-J  
for longer service life between battery changes. These  
batteries are available at many local retail stores.  
3 beeps, pause, 3 beeps, pause.  
14  
 
Most carbon zinc batteries have an average service life  
of 1 year; most alkaline batteries have an average serv-  
ice life of 1-2 years; most Lithium batteries have an  
average service life of 6-10 years. Actual service life  
depends on the smoke alarm and the environment in  
which it is installed. All the batteries specified above  
are acceptable replacement batteries for this unit.  
Regardless of the manufacturer’s suggested battery  
life, you MUST replace the battery immediately once  
the unit starts “chirping” (the “low battery warning”).  
IF THIS SMOKE ALARM SOUNDS  
If the alarm sounds and you are not testing it, it is  
warning you of a potentially dangerous situation  
that requires your immediate attention.  
and fan the smoke away from the unit (Model  
4120SB Only: use the Silence Feature to silence the  
alarm). This will silence the alarm, and once the  
smoke clears the unit will reset itself automatically.  
NOTE: When an interconnected system of AC  
powered units is in alarm, the alarm indicator light on  
the unit(s) that initiated the alarm will blink rapidly. It  
will remain OFF on any remaining units.  
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.  
Responding To An Alarm  
Never disconnect the AC power to quiet an  
unwanted alarm. Disconnecting the power  
disables the Smoke Alarm so it cannot sense  
smoke. This will remove your protection.  
If the unit alarms and you are not absolutely certain of  
the source of the smoke, get everyone out of the  
dwelling immediately. Stay calm and follow your family  
escape plan. Stay as low to the ground as possible,  
and cover your mouth with a damp cloth. Never open a  
door before testing to see if it is hot. Call the Fire  
Department from outside, and give them your address  
then name. Read What To Do In Case Of Fire” at the  
end of this manual for more information. If the unit  
alarms and you are certain that the source of smoke  
is not a fire—cooking smoke or an extremely dusty fur-  
nace, for example—open a nearby window or door  
ELECTRICAL SHOCK HAZARD: Attempting to dis-  
connect the power connector from the unit when  
the power is on may result in electrical shock,  
serious injury or death.  
15  
 
3. While the units are in the “silence mode,” the test  
buttons will not operate. The alarms cannot be  
tested while in the silence mode.  
MODEL 4120SB ONLY—  
USING THE SILENCE FEATURE  
The Silence feature on this unit can temporarily quiet  
an unwanted alarm for several minutes.  
4. The chirping” on the initiating alarm will stop  
once the unit returns to normal operation.  
The Silence feature does not disable the unit—it  
makes it temporarily less sensitive to smoke.  
For your safety, if smoke around the unit is dense  
enough to suggest a potentially dangerous  
situation, the unit will stay in alarm or may re-  
alarm quickly. If you do not know the source of  
the smoke, do not assume it is an unwanted  
alarm. Not responding to a fire can result in  
property loss, injury, or death.  
The Silence feature on these units can temporarily  
quiet an unwanted alarm for up to 15 minutes. To use  
this feature, press the “Push to Silence” button on the  
cover. Once you activate it, you will hear a reminder  
“chirp” about once a minute (for up to 15 minutes)  
and the Test feature is temporarily disabled. The  
“chirping” will stop once the unit returns to normal  
operation. If the unit will not silence and no heavy  
smoke is present, or if it stays in silence mode  
continuously, it should be replaced immediately.  
While the unit is in the “silence mode,” the test button  
will not operate. The Alarm cannot be tested while in  
the silence mode.  
To silence Smoke Alarms  
in an interconnected series:  
1. To silence multiple alarms in an interconnected  
series, you must press the silence button on the  
unit(s) that triggered the alarm.  
NOTE: The red light under the silence button on the  
initiating alarm will flash rapidly. The red light will be  
off on all other Smoke Alarms.  
2. Once you activate the Silence feature, you will  
hear a reminder chirp” on the initiating alarm  
about once a minute (for up to 15 minutes).  
16  
 
PROTECTING YOUR FAMILY FROM FIRE  
Putting up Smoke Alarms is just one step in protect-  
ing your family from fires. You must also reduce the  
chance a fire will start in your dwelling, and have a  
plan for escaping safely if one does. To have a good  
fire safety program, you must:  
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 flammable materials in proper containers.  
Develop a family escape plan and practice it with  
everyone in your family, including small children.  
1) Draw a floor plan of your residence and identify  
at least two exits from each room and one way to  
get out of each bedroom without opening the door;  
2) Decide on a meeting place a safe distance from  
residence, and make sure everyone knows to wait  
there; 3) Know where to go to call the Fire  
4) Keep electrical appliances in good condition and  
don’t overload electrical circuits.  
5) Keep stoves, barbecue grills, fireplaces and  
chimneys free from grease and debris.  
6) Never leave anything cooking on the stove  
unattended.  
Department from outside the residence; 4) Make sure  
everyone—including all children—know what the  
alarm signal means and how to react to it. Teach them  
they must be prepared to leave the residence by  
themselves if needed; 5) Hold fire drills every 6  
months and practice how to escape safely. Show  
children how to check if doors are hot before opening  
them. Show them how to use an alternate exit if a  
door is hot and shouldn’t be opened. Teach them to  
stay close to the floor and crawl if necessary.  
7) Keep portable heaters and open flames, like  
candles, away from flammable materials.  
8) Don’t allow rubbish to accumulate.  
Install at least one Smoke Alarm on every level of your  
dwelling and/or dwelling unit, in every bedroom, and  
in every sleeping area. Keep alarms clean, and test  
them weekly. Replace smoke alarms immediately if  
they are not working properly. Smoke alarms that do  
not work cannot alert you to a fire.  
Keep at least one working fire extinguisher on every  
floor, and an additional one in the kitchen. Have fire  
escape ladders or other reliable means of escape  
from an upper floor in case stairs are blocked.  
17  
 
WHAT TO DO IN CASE OF FIRE  
IF YOUR SMOKE ALARM  
NEEDS SERVICE  
• Don’t panic; stay calm. Follow your escape plan.  
Your safe escape may depend on thinking clear-  
ly and remembering what you have practiced.  
Always discharge the branch circuit before servicing  
an AC or AC/DC Smoke Alarm. First, turn off the AC  
power at the circuit breaker or fuse box. Next,  
remove the battery from Smoke Alarms with battery  
back-up. Finally, press and hold the test button for  
5-10 seconds to discharge the branch circuit.  
• Get out of the dwelling 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.  
If this unit is not working properly, there are a few  
simple things you should check before returning or  
replacing the unit.  
• Cover your nose and mouth with a cloth (prefer-  
ably wet). Take short, shallow breaths.  
• Keep doors and windows closed, unless you  
need to escape through them.  
• Make sure it is clean as described in ”Regular  
Maintenance.” A build-up of dirt, dust or grease  
can affect the units performance.  
• Make sure the unit is installed in a proper  
location. If you experience frequent unwanted  
alarms, try relocating it. See “Where To Install  
Smoke Alarms” for details.  
• Make sure it is receiving AC power from the  
household current. Check that the back-up  
battery is fresh and still providing back-up  
protection.  
• Meet at your planned meeting place outside  
your home, and do a head count to make sure  
everyone 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 mak-  
ing your home safer, and on creating your own family  
escape plan.  
If the unit is still not operating properly, and it is still  
under warranty, send it, shipping prepaid to: BRK  
Brands, Inc., Attn: Consumer Affairs, 3920 Enterprise  
Court, Aurora, IL 60504-8132. Enclose a note in the  
package describing what’s wrong with the unit. See  
warranty information at the end of this manual.  
Do not try to fix the unit yourself—this will void  
your warranty!  
18  
 
TROUBLESHOOTING  
ELECTRICAL SHOCK HAZARD. Always TURN OFF POWER before checking connections or disconnecting  
any Smoke Alarm!  
Problem....  
You should...  
Smoke Alarm sounds when  
no smoke is visible.  
• Clean the Smoke Alarm. (See Testing and Maintenance.)  
• Check the location of the Alarm. (See Where To Install Smoke Alarms.)  
• Check if you accidently pushed the Test Button.  
You experience frequent  
unwanted alarms (like in  
response to cooking smoke)  
• Check the location of the Smoke Alarm. The smoke alarm may be too close  
to a kitchen, cooking appliance, or steamy bathroom. (See “Where To  
Install Smoke Alarms.)  
Smoke Alarm chirps  
intermittently.  
• Check all AC connections for proper installation. (See “How To Install This  
Smoke Alarm” and Testing and Maintenance.)  
• Check that the battery is installed correctly and is working properly. (See  
How To Install This Smoke Alarm” and Testing and Maintenance.)  
• Check the location of the Alarm. (See “Where To Install Smoke Alarms.)  
• Clean the Smoke Alarm. (See Testing and Maintenance.)  
You may have accidently pressed the Silence Button.  
Alarm horn doesn’t sound  
during testing.  
Interconnected units do not  
alarm during testing.  
• Check that the batteries are installed correctly and are working properly. (See  
How To Install This Smoke Alarm” and Testing and Maintenance.)  
• Check all AC connections for proper installation. (See “How To Install This  
Smoke Alarm” and Testing and Maintenance.)  
You may have accidently pressed the Silence Button.  
During installation the  
alarm chirps” once a  
minute.  
You may have accidently pressed the Silence Button. The Smoke Alarm  
should return to normal operation after 15 minutes. If the chirping persists  
try installing a new 9V battery.  
If you still have questions after reading this manual, please call Consumer Affairs, Monday-Friday, 7:30 am-5pm  
(Central Time): 1-800-323-9005.  
19  
 
SPECIAL COMPLIANCE CONSIDERATIONS  
This unit alone is not a suitable substitute for complete fire detection systems in places housing many  
people—like apartment buildings, condominiums, hotels, motels, dormitories, hospitals, long-term health  
care facilities, nursing homes, day care facilities, or group homes of any kind—even if they were once  
single-family homes. It is not a suitable substitute for complete fire detection systems in warehouses,  
industrial facilities, commercial buildings, and special-purpose non-residential buildings which require  
special fire detection and alarm systems. Depending on the building codes in your area, this unit may be  
used to provide additional protection in these facilities.  
The following information applies to all four types  
of buildings listed below:  
Institutions:  
Hospitals, day care facilities, long-term health care  
facilities. This type of unit is suitable for use in  
individual patient sleeping/resident rooms, provided  
a primary fire detection system already exists to meet  
fire detection requirements in common areas like  
lobbies, hallways, or porches. Using this type of  
unit in common areas may not provide sufficient  
warning to all residents or meet local fire protection  
ordinances/regulations.  
In new construction, most building codes require the  
use of AC or AC/DC powered Smoke Alarms only. AC,  
AC/DC, or DC powered Smoke Alarms can be used in  
existing construction as specified by local building  
codes. Refer to NFPA 72 (National Fire Alarm Code) and  
NFPA 101 (Life Safety Code), local building codes, or  
consult your Fire Department for detailed fire protection  
requirements in buildings not defined as “households.”  
Hotels/Motels:  
Single-Family Residence:  
Single family dwelling, townhouse.  
Also boarding houses and dormitories. This type of  
unit is suitable for use inside individual sleeping/resi-  
dent rooms, provided a primary fire detection system  
already exists to meet fire detection requirements in  
common areas like lobbies, hallways, or porches.  
Using this type of unit in common areas may not  
provide sufficient warning to all residents or meet  
local fire protection ordinances/regulations.  
Multi-Family or Mixed Occupant Residence:  
Apartment building, condominium. This type of unit  
is suitable for use in individual apartments or condos,  
provided a primary fire detection system already  
exists to meet fire detection requirements in common  
areas like lobbies, hallways, or porches. Using this  
type of unit in common areas may not provide  
sufficient warning to all residents or meet local  
fire protection ordinances/regulations.  
20  
 
LIMITATIONS OF SMOKE ALARMS  
Smoke alarms have played a key role in reducing  
deaths resulting from home fires worldwide. However,  
like any warning device, smoke alarms can only work  
if they are properly located, installed, and maintained,  
and if smoke reaches them. They are not foolproof.  
battery back-up (see “Other Features Of Smoke  
Alarms) or professional fire detection systems, so if  
one unit senses smoke, all units alarm.  
Interconnected units may provide earlier warning than  
stand-alone units since all units alarm when one  
detects smoke.  
Smoke Alarms cannot work without power. Battery  
operated units cannot work if the batteries are miss-  
ing, disconnected or dead, if the wrong type of batter-  
ies are used, or if the batteries are not installed cor-  
rectly. AC units cannot work if the AC power is cut off  
for any reason (open fuse or circuit breaker, failure  
along a power line or at a power station, electrical fire  
that burns the electrical wires, etc.). If you are con-  
cerned about the limitations of battery or AC power,  
install both types of units.  
Smoke Alarms may not be heard. Though the  
alarm horn in this unit meets or exceeds current UL  
standards, it may not be heard if: 1) the unit is located  
outside a closed or partially closed door, 2) residents  
recently consumed alcohol or drugs, 3) the alarm is  
drowned out by noise from stereo, TV, traffic, air con-  
ditioner or other appliances, 4) residents are hearing  
impaired or sound sleepers.  
Special purpose units, like those with visual and  
audible alarms, should be installed for hearing  
impaired residents.  
Smoke Alarms cannot detect fires if the smoke  
does not reach them. Smoke from fires in chimneys  
or walls, on roofs, or on the other side of closed  
doors may not reach the sensing chamber and set off  
the alarm. That is why one unit should be installed  
inside each bedroom or sleeping area—especially if  
bedroom or sleeping area doors are closed at night—  
and in the hallway between them.  
Smoke Alarms may not have time to alarm before  
the fire itself causes damage, injury, or death, since  
smoke from some fires may not reach the unit imme-  
diately. Examples of this include persons smoking in  
bed, children playing with matches, or fires caused by  
violent explosions resulting from escaping gas.  
Smoke Alarms may not detect fire on another floor  
or area of the dwelling. For example, a stand-alone  
unit on the second floor may not detect smoke from a  
basement fire until the fire spreads. This may not give  
you enough time to escape safely. That is why recom-  
mended minimum protection is at least one unit in  
every sleeping area, and every bedroom on every  
level of your dwelling. Even with a unit on every floor,  
stand-alone units may not provide as much protection  
as interconnected units, especially if the fire starts in a  
remote area. Some safety experts recommend  
Smoke Alarms are not foolproof. Like any electronic  
device, smoke alarms are made of components that  
can wear out or fail at any time. You must test the unit  
weekly to ensure your continued protection. Smoke  
Alarms cannot prevent or extinguish fires. They are  
not a substitute for property or life insurance.  
Smoke Alarms have a limited life. The unit should  
be replaced immediately if it is not operating properly.  
You should always replace a Smoke Alarm after 10  
years from date of purchase. Write the purchase date  
on the space provided on back of unit.  
installing interconnected AC powered units with  
21  
 
10-YEAR LIMITED WARRANTY  
Coverage: BRK Brands, Inc. ("BRK") the maker  
limitations or exclusion may not apply to you. This warranty  
gives you specific legal rights, and you may also have other  
rights that vary from state to state, or province to province.  
of BRK Electronics® brand products, warrants  
that for a period of 10 years from the date of  
purchase, this product will be free from defects  
in material and workmanship. BRK, at its  
How to Obtain Warranty Service  
option, will repair or replace this product or any  
component of the product found to be defective during the  
warranty period. Replacement will be made with a new or  
remanufactured product or component. If the product is no  
longer available, replacement may be made with a similar prod-  
uct of equal or greater value This is your exclusive warranty.  
Service: If service is required, do not return the product to your  
retailer. In order to obtain warranty service, contact the  
Consumer Affairs Division at 1-800-323-9005, 7:30 AM to 5:00  
PM, Central Standard Time, Monday through Friday. To assist  
in serving you, please have the model number and date of pur-  
chase available when calling.  
This warranty is valid for the original retail purchaser from the  
date of initial retail purchase and is not transferable. Keep the  
original sales receipt. Proof of purchase is required to obtain  
warranty performance. BRK dealers, service centers, or retail  
stores selling BRK products do not have the right to alter,  
modify or any way change the terms and conditions of this  
warranty.  
Battery: BRK Brands, Inc. make no warranty, express or  
implied, written or oral, including that of merchantability or fit-  
ness for any particular purpose with respect to battery.  
This warranty does not cover normal wear of parts or damage  
resulting from any of the following: negligent use or misuse of  
the product, use on improper voltage or current, use contrary  
to the operating instructions, disassembly, repair or alteration  
by anyone other than BRK or an authorized service center.  
Further, the warranty does not cover acts of God, such as fire,  
flood, hurricanes and tornadoes or any batteries that are  
included with this unit.  
Please record Date and Where Purchased:  
_____________________________________________  
BRK shall not be liable for any incidental or consequential dam-  
ages caused by the breach of any express or implied warranty.  
Except to the extent prohibited by applicable law, any implied  
warranty of merchantability or fitness for a particular purpose is  
limited in duration for to the duration of the above warranty.  
Some states, provinces, or jurisdictions do not allow the exclu-  
sion or limitation of incidental or consequential damages or lim-  
itations on how long an implied warranty lasts, so the above  
BRK Brands, Inc.  
3901 Liberty Street Road, Aurora, IL 60504-8122  
Consumer Affairs: 1-800-323-9005  
All Rights Reserved. ©2001 BRK Brands, Inc.  
BRK Electronics® is a registered  
trademark of BRK Brands, Inc.  
M06-2016-008 08/01  
22  
 

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