BRK electronic 4120 AC - Manual (Page 11)

9
To Unlock the Battery Compartment (continued)...
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 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 door.
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.
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 screwdriver and the Smoke
Alarm counterclockwise (left) at the same time.