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HOW TO INSTALL THIS SMOKE ALARM
This unit is designed to be mounted on any standard wiring junction box up to a 4-inch diagonal size, on either the
ceiling or wall (if allowed by local electrical codes). Read "Where to Install Smoke Alarms" and "Where Not To Install
Smoke Alarms" before you begin installation. Tools you will need: Standard/Flathead screwdriver.
Important Installation Parts
The Mounting Bracket
To remove the mounting bracket
from the smoke alarm base, hold
the smoke alarm base firmly and
twist the mounting bracket
counterclockwise. The mounting
bracket installs onto the junction
box. It has a variety of screw slots
to fit most boxes. If a junction box is
not already in place, install one
using standard #12 or #14 gauge solid copper Appliance
Wiring Material.
The Power Connector
The power connector plugs into a power input
block on the smoke alarm. It supplies the unit
with AC power.
•The black wire is "hot."
•The orange wire is used for interconnect.
•The white wire is neutral.
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.
Activating the Battery Back-up
The battery back-up will not operate until you activate the battery.
Activate Battery Back-Up" tab. You do not need to open the battery compartment and reposition the
battery. When the battery is activated, the red light will shine continuously for 5-10 seconds, then begin
to flash about once a minute. Test the battery back-up. Press and hold the test button on the cover until
the alarm sounds.
NOTE:
During installation or testing, if you accidentally press the Silence button, the alarm will
Cat. Nos. SA4121C and SA4121B:
"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.
Installing This Smoke Alarm:
The basic installation of this smoke alarm is the similar whether you want to install one smoke alarm, or interconnect
more than one smoke alarm. If you are interconnecting more than one smoke alarm, you MUST read "Special
Requirements For Interconnected Smoke Alarms" below before you begin installation.
1. Remove the mounting bracket from the base. Install the mounting bracket to the junction box
2. Using wire nuts, connect the power connector to the household wiring.
STAND-ALONE SMOKE ALARM ONLY
:
INTERCONNECTED SMOKE ALARMS ONLY:
• Connect the white wire on the power con-
Strip off about 1/2" (12 mm) of the plastic coating on the
orange wire on the power connector.
nector to the neutral wire in the junction
box.
• Connect the white wire on the power con-
• Connect the black wire on the power con-
nector to the hot wire in the junction box.
• Connect the black wire on the power con-
• Tuck the orange wire inside the junction
box. It is used for interconnect only
• Connect the orange wire on the power con-
3. Plug the power connector into the back of the smoke alarm.
4. Position the base of the alarm over the mounting bracket and turn. The alarm can be positioned over the
bracket every 60°. Turn the smoke alarm clockwise (right) until the unit is in place.
5. Check all connections.
1
2
2
6. Make sure the smoke alarm is receiving AC power. Under normal operation, the green power indicator light will
5
3
4
6
7
7. Test the smoke alarm. Press and hold the test button on the cover of the unit until the alarm sounds (the unit
8
Parts of Smoke Alarm
IMPORTANT!
1 Mounting bracket 5 Interconnect wire
If any smoke alarm does not alarm, TURN OFF POWER and recheck connections. If any smoke alarm still does not
2 Mounting slots
6 Latch to open battery
alarm when you test it after restoring power, replace it immediately.
and screws
compartment
Special Requirements For Interconnected Smoke Alarms
3 Hot (black) AC
7 Swing-out battery
wire
compartment
4 Neutral (white)
8 Quick-connect
AC wire
power connector
NOTE: When power is applied, unit(s) may alarm momentarily.
Interconnected units can provide earlier warning of fire than stand-alone units, especially if a fire starts in a remote area of
the home. If any unit in the series senses smoke, all units will alarm. This unit can be interconnected with First Aler
To activate: remove the "Pull to
alarms SA4120B, SA4121B, SA4919B, SA86B, SA100B ; BRK Electronics
4120SB, 4919, 5919, 5919TH, 86RAC; BRK Electronics
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.
Interconnected units must meet ALL of the following requirements:
nector to the neutral wire in the junction box.
nector to the hot wire in the junction box.
nector to the interconnect wire in the junction
box. Repeat for each unit you are intercon-
necting.
Never connect the hot or neutral wires
in the junction box to the orange interconnect
wire.
4
STAND-ALONE SMOKE ALARM ONLY
:
INTERCONNECTED SMOKE ALARMS ONLY:
• If you are only installing one smoke alarm,
•
If you are interconnecting multiple smoke
restore power to the junction box.
alarms, repeat steps 1-4 for each smoke alarm
in the series. When you are finished, restore
power to the junction box.
DANGER!
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.
shine continuously. If the power indicator light does not light, TURN OFF POWER TO THE JUNCTION BOX and
recheck all connections. If all connections are correct and the power indicator still does not light when you
restore the power, the unit should be replaced immediately.
may continue to alarm for a few seconds after you release the button). During testing, you will hear a loud,
repeating horn pattern: 3 beeps, pause, 3 beeps, pause. In an interconnected series, you must test each
smoke alarm individually.
WARNING!
• Failure to meet any of the requirements for interconnecting smoke alarms could damage the
units, and cause them to malfunction, removing your protection.
• AC and AC/DC smoke 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 smoke alarms will not operate.
®
heat alarm HD6135F.
• A maximum of 18 units total may be interconnected (Maximum of 12 smoke alarms).
• The same fuse or circuit breaker must power all interconnected smoke alarms.
• The total length of wire interconnecting the units should be less than 1000 feet (300 meters). The intercon-
nect 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 the National Electrical Code (NFPA 70).
Refer to NFPA 72, Chapter 2 and/or your local building code for further connection requirements.
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A.
A
Unswitched
120V AC
5
5
60Hz source
4
4
3
3
2
1
1
1
Smoke alarm
3 Power connector
5 Junction box
2
Ceiling or wall
4 Wire nut
6 Neutral (white) AC
wire
®
t
smoke
®
smoke alarms 100S, 2002RAC, 4120B,
6
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B.
B
7
8
To additional units;
Maximum = 18 total
(Maximum 12
smoke alarms)
7 Interconnect wire
8 Hot (black) AC wire
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