First Alert 9120B - Manual (Page 4)

OPTIONAL LOCKING FEATURES
The optional 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
(Model 9120B Only)
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.
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.
3. Using needle-nose pliers or a utility
knife, detach one locking pin from
the mounting bracket.
TO UNLOCK THE BATTERY COMPARTMENT
(Model 9120B Only)
Once the Smoke 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
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.
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.”
2. Disconnect the power connector by gently prying
it away from the back of the Smoke Alarm.
3. Insert a flathead screwdriver under the head of
the locking pin, and gently pry it out of the bat-
tery compartment lock. (If you plan to relock the
battery compartment, save the locking pin.)
4. To relock the battery compartment, close the battery door and reinsert
locking pin in lock.
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.
TO UNLOCK THE MOUNTING BRACKET
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.
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. 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 screw-
driver and the Smoke Alarm counterclockwise (left) at the same time.
TO LOCK THE MOUNTING BRACKET
1. Using needle-nose pliers or utility
knife, detach one locking pin from
mounting bracket.
2. Insert the locking pin into the
lock located on the base as
shown in the diagram.
3. When you attach the Smoke
Alarm to the mounting
bracket, the locking pin’s
head will fit into a notch on
the bracket.
4. Push the locking pin through the
black dot on the label on the back
of the Smoke Alarm.
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