• First Alert Smoke And Co Detectors
• First Alert Smoke Alarm Manual

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HOW TO INSTALL THIS SMOKE ALARM

THE PARTS OF THIS SMOKE ALARM

FOLLOW THESE SIMPLE STEPS!

Tools you will need:

• Pencil

• Drill with 3/16” (5 mm) drill bit

• Hammer

• Standard Flathead screwdriver

1. Remove the mounting bracket from the Smoke Alarm base. Hold the

mounting bracket against the ceiling (or wall) and make a mark at
the center of each of the mounting slots with a pencil.

2. Put the unit where it won’t get covered with dust when you drill the

mounting holes.

3. Using a 3/16” (5 mm) drill bit, drill a hole through each pencil mark.

4. Insert the plastic screw anchors (in the plastic bag with screws) into

the holes. Tap the screw anchors gently with a hammer, if necessary,
until they are flush with the ceiling or wall.

5. Tighten the screws (provided) into the screw anchors.

6. Activate the battery. With the battery

First Alert Smoke And Co Detectors

compartment open, install the battery
so the terminals on the battery match
the terminals on the Smoke Alarm.
Match “+” to “+” and “-” to “-.” Push
the battery in until it snaps in securely
and cannot be shaken loose.

If the battery is not snapped in completely, the unit cannot receive
battery power. The Smoke Alarm may beep briefly when you install
the battery—this is normal.

7. 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 Smoke Alarm clockwise (right) until the unit is in place.

8. Test the Smoke Alarm. See “Weekly Testing.”

The Parts of This Unit

1. Mounting Bracket

2. Mounting Slots and Screws

3. Locking Pins (break out of bracket)

4. Latch to Open Battery Compartment

5. Swing-Out Battery Compartment

To remove the mounting bracket
from the Smoke Alarm base, hold the
Smoke Alarm base firmly and twist the
mounting bracket counterclockwise.

1

2

3

2

5

4

3

+

–

OPTIONAL LOCKING FEATURES

The locking features are designed to discourage 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.

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 mounting bracket, depending 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

TO LOCK THE BATTERY COMPARTMENT

Do not lock the battery compartment until you have installed the
battery and tested the unit.

1. 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.

2. Using needle-nose pliers or a

utility knife, detach one locking
pin from the mounting bracket.

3. Push the locking pin through

the hole near the battery
drawer on the back of the
Smoke Alarm.

TO UNLOCK THE BATTERY COMPARTMENT

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.”

2. 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.)

3. To relock the battery compartment, close the battery door and

reinsert locking pin in lock.

4. Reattach the Smoke Alarm to the mounting bracket.

When replacing the battery, always test the Smoke Alarm before
relocking the battery compartment.

TO UNLOCK THE MOUNTING BRACKET

1. Insert a flathead screwdriver between the

mounting bracket pin and the mounting
bracket.

2. Pry the Smoke Alarm

away from the
bracket by turning
both the screwdriver
and the Smoke Alarm
counterclockwise
(left) at the same
time.

TO LOCK THE MOUNTING BRACKET

1. Using needle-nose pliers, detach one locking pin from mounting bracket.

2. Insert the locking pin into the lock located on the pivoting hinge of the

First Alert Smoke Alarm Manual

battery door.

3. When you attach the Smoke Alarm to the mounting bracket, the locking

pin’s head will fit into a notch on the bracket.

Alarm Base

1. Battery Compartment

2. Test button (Model SA300)

2. Test/Silence button (Models

SA303 and SA305)

This unit is designed to be mounted on
the ceiling, or on the wall if necessary.

DO NOT attach this Alarm to an electrical junction box.
Attachment to an electrical box may impair the Alarm’s operation.
Attach directly to wallboard or flat wall or ceiling surface.

2