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 • Standard Flathead screwdriver.

Both locking features use locking pins, which are molded into the mounting bracket. Using needle-nose pliers, 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.

TO LOCK THE BATTERY COMPARTMENT

Do not lock the battery compartment until you have installed the battery and tested the battery back-up.

1.Push and hold Test/Silence 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, 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

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/Silence 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 battery 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 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 opposite from the battery drawer 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.

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.

SA520 specifications

The First Alert SA520 is a highly regarded smoke and carbon monoxide (CO) alarm that combines cutting-edge technology with user-friendly features to ensure the safety of your home. Designed for efficiency and reliability, the SA520 is an optimal choice for individuals seeking peace of mind regarding fire and gas hazards.

One of the standout features of the First Alert SA520 is its dual-sensor technology, which utilizes both photoelectric and ionization sensors. This dual-sensor approach allows the alarm to detect a wider range of smoke particles, making it more responsive to different types of fires. For instance, photoelectric sensors are particularly effective in detecting smoldering fires, which may not produce significant flames, while ionization sensors are better suited for fast-flaming fires. This combination maximizes safety by ensuring that users are alerted as quickly as possible to potential dangers.

Another important characteristic of the SA520 is its carbon monoxide detection capability. Carbon monoxide is an odorless and colorless gas that can be extremely dangerous, making the inclusion of CO detection a critical feature. The alarm emits a loud warning signal when elevated CO levels are detected, providing an essential safeguard for households.

The First Alert SA520 is designed with user convenience in mind. The battery-operated unit ensures that installation is hassle-free, as it can be easily mounted on any wall or ceiling without the need for complicated wiring. Additionally, the unit features a single test/silence button, allowing users to quickly test the functionality of the alarm or silence it during false alarms.

Furthermore, the SA520 includes a battery life indicator, informing users when batteries need to be replaced. This proactive feature contributes to the overall effectiveness of the alarm, helping prevent any gaps in protection due to dead batteries.

The sleek, compact design of the First Alert SA520 allows it to blend seamlessly into any home decor while providing essential life-saving technology. Designed to meet rigorous safety standards, the SA520 has received positive reviews for its reliability and user-friendliness.

In conclusion, the First Alert SA520 is an advanced smoke and carbon monoxide alarm that provides critical protection through its dual-sensor technology, user-friendly features, and reliable operation. Whether for new installations or replacements, the SA520 is an excellent choice for ensuring the safety of your home and loved ones.