This Smoke Alarm is designed to be mounted on any standard wiring junction box up to a 4-inch (10 cm) size, on either the ceiling or wall (if allowed by local codes). Read “Recommended Locations For Smoke Alarms” and “Locations to Avoid For Smoke Alarms” before you begin installation.
QUICK INSTALLATION INSTRUCTIONS Easily expand an existing interconnected 120V AC hardwired system by simply replacing one Alarm in the series with the First Alert Model SA520. Then add additional battery-operated Alarms to expand the system with no additional electrical work.
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.
NOTE: When power is applied, unit(s) may alarm momentarily. *When any Smoke Alarm in an interconnected series triggers an alarm, its red LED will flash rapidly. The red LEDs will remain OFF on any remaining alarms in the series. This feature helps responders identify which unit(s) triggered the alarm.
Do not try fixing the alarm yourself – this will void your warranty! If the Smoke Alarm is still not operating properly, and it is still under warranty, please see “How to Obtain Warranty Service” in the Limited Warranty.
Battery: BRK Brands, Inc. make no warranty, express or implied, written or oral, including that of merchantability or fitness for any particular purpose with respect to battery. First Alert ® is a registered trademark of the First Alert Trust used under license. ONELINK is a trademark of BRK Brands, Inc. LIMITATIONS OF SMOKE ALARMS Smoke Alarms have played a key role in reducing deaths resulting from home fires worldwide.