Quick Installation Instructions

Easily expand an existing interconnected 120V AC hardwired system by simply replacing one Alarm in the series with the First Alert® ONELINKTM Model SA520. Then add additional battery-operated Alarms to expand the system with no additional electrical work.

1. Insert the batteries into the battery drawer of the first Alarm and close the drawer.

2. The Alarm will sound with a chirp.

3. If you purchased the Talking Smoke and Carbon Monoxide Alarm, you will now be prompted to set the

Alarm's location. Follow the direction given by the Alarm.

NOTE: Steps 4 through 6 need to be completed within two minutes. If more than two minutes pass, the Green power LED will stop blinking. Simply open the battery drawer of the second Alarm and repeat steps 4 through 6.

4.Insert the batteries into the battery drawer of the next Alarm. DO NOT CLOSE THE DRAWER.

5.Press and hold the test button and then close the battery drawer.

6.Once you hear the unit chirp, release the test button. The Green power LED will start to blink indicating the ONELINKTM Alarm is waiting for program data from one of the other setup ONELINKTM Alarms.

7.Press and hold the test button on the first Alarm, until the second Alarm chirps and its Green power LED stops blinking. Then release the test button.

8.If you purchased the Talking Smoke and Carbon Monoxide Alarm, you will now be prompted to set the Alarm's location. Follow the directions given by the Alarm.

9.If you have purchased the hardwired battery back-up ONELINKTM Alarm, you can now connect the hardwired Alarm by installing the three-wire connector on the ceiling to the Alarm.

10.Repeat steps 4-9 for additional ONELINKTM Alarms.

You have now successfully linked your new ONELINKTM Alarms. To add additional Alarms at a later time, follow steps 4 through 9.

FOLLOW THESE INSTALLATION STEPS

The basic installation of this Smoke Alarm is similar whether you want to install one Smoke Alarm, or interconnect more than one Smoke Alarm. If you are interconnecting more than one Smoke Alarm, you MUST read “Special Requirements For Interconnected Smoke Alarms” below before you begin installation.

ELECTRICAL SHOCK HAZARD. Turn off power to the area where you will install this unit at the circuit breaker or fuse box before beginning installation. Failure to turn off the power before installation may result in serious electrical shock, injury or death.

1. Remove the mounting bracket from the base, and attach it to the junction box.

2. Using wire nuts, connect the power connector to the household wiring.

STAND-ALONE ALARM ONLY:

•Connect the white wire on the power connector to the neutral wire in the junction box.

•Connect the black wire on the power connector to the hot wire in the junction box.

•Tuck the orange wire inside the junction box. It is used for interconnect only.

INTERCONNECTED UNITS ONLY:

Strip off about 1/2” (12 mm) of the plastic coating on the orange wire on the power connector.

•Connect the white wire on the power connector to the neutral wire in the junction box.

•Connect the black wire on the power connector to the hot wire in the junction box.

•Connect the orange wire on the power connector to the interconnect wire in the junction box. Repeat for each unit you are interconnecting. Never connect the hot or neutral wires in the junction box to the orange interconnect wire. Never cross hot and neutral wires between Alarms.

3.Plug the power connector into the back of the Smoke Alarm.

4.Position the base of the Smoke Alarm over the mounting bracket and turn. The Alarm can be positioned over the bracket every 90°. Turn the Smoke Alarm clockwise (right) until the unit is in place.

5.Check all connections.

Improper wiring of the power connector or the wiring leading to the power connector will cause damage to the Alarm and may lead to a non-functioning Alarm.

Continued above...

INSTALLATION STEPS, Continued

STAND-ALONE ALARM ONLY:

•If you are only installing one Smoke Alarm, restore power to the junction box.

INTERCONNECTED UNITS ONLY:

•If you are interconnecting multiple Smoke Alarms, repeat steps 1-5 for each Smoke Alarm in the series. When you are finished, restore power to the junction box.

ELECTRICAL SHOCK HAZARD. Do not restore power until all Smoke Alarms are completely installed. Restoring power before installation is complete may result in serious electrical shock, injury or death.

6.Make sure the Smoke Alarm is receiving AC power. Under normal operation, the Green power indicator light will shine continuously.

7.If the Green power indicator light does not light, TURN OFF POWER TO THE JUNCTION BOX and recheck all connections. If all connections are correct and the Green power indicator still does not light when you restore the power, the unit should be replaced immediately.

8.Test each Smoke Alarm. Press and hold the Test/Silence button until the unit alarms. When testing a series of interconnected units you must test each unit individually. Make sure all units alarm when each one is tested.

If any unit in the series does not alarm, TURN OFF POWER and recheck connections. If it does not alarm when you restore power, replace it immediately.

Special Requirements For Interconnected Smoke Alarms

•Failure to meet any of the above requirements could damage the units and cause them to malfunction, removing your protection.

•AC and AC/DC Smoke Alarms can be interconnected. Under AC power, all units will alarm when one senses smoke. When power is interrupted, only the AC/DC units in the series will continue to send and receive signals. AC powered Smoke Alarms will not operate.

Interconnected units can provide earlier warning of fire than stand-alone units, especially if a fire starts in a remote area of the dwelling. If any unit in the series senses smoke, all units will alarm. To determine which Smoke Alarm initiated an alarm, see table:

On Initiating Alarms			Red LED flashes rapidly
On All Other Alarms			Red LED is Off

Interconnect units within a single family residence only. Otherwise all house- holds will experience unwanted alarms when you test any unit in the series. Interconnected units will only work if they are wired to compatible units and all requirements are met. This unit is designed to be compatible with:

First Alert® Smoke Alarm Models SA4120, SA4121B, SA100B, 9120 series and BRK Electronics® Smoke Alarm Models 100S, 4120 series, 9120 series, 7010 series; BRK Electronics® Heat Alarm Models HD6135F, HD6135FB; Smoke/CO Alarm Models SC6120B, SC9120B; CO Alarm Model CO5120B; Relay Modules RM3 and RM4.

Interconnected units must meet ALL of the following requirements:

•A maximum of 18 compatible units may be interconnected (Maximum of 12 Smoke Alarms).

•The same fuse or circuit breaker must power all interconnected units.

•The total length of wire interconnecting the units should be less than 1000 feet (300 meters). The interconnect wire should be #18 gauge or larger, rated at least 300V. If an interconnect wire is not already part of your household wiring, you will need to install one. This type of wire is commonly available at Hardware and Electrical Supply stores.

•All wiring must conform to all local electrical codes and Article 760 of NFPA 70 (NEC). Refer to NFPA 72, NFPA 101, and/or your local building code for further connection requirements.

A }		876 } B
5		5
4	4
	3	3
2		2
1		1

A. Unswitched 120VAC B. To additional units; Maximum = 18 total

	60 Hz source		(Maximum 12 Smoke Alarms)

1.	Smoke Alarm	4.	Wire Nut	7.	Interconnect Wire
2.	Ceiling or Wall	5.	Junction Box		(Orange)
2.	Ceiling or Wall	5.	Junction Box	8.	Hot Wire (Blk)
3. Power Connector		6. Neutral Wire (Wht)		8.	Hot Wire (Blk)
3. Power Connector		6. Neutral Wire (Wht)

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.