How to Interconnect Smoke Alarms

Replace one hard-wired alarm in an existing system with a new hard-wired alarm of the same brand as your new wireless alarms. Turn off the electricity in that room. Press the tabs to remove the cover of the old unit. Disconnect the wires, keeping track of which colored wires are connected to each other. This may not be necessary if there is an adapter on the new unit.

Screw the new unit to the wall mount. Twist together the colored wires of the new alarm to the matching colored wires in the wall. Turn on the electricity. Snap the cover into place.

Press the test button. The unit should chirp and display or speak the names of rooms. Program the alarm's location by pressing the test button when the correct room is listed.

Insert batteries into the first wireless alarm. Press and hold the test button. Release the button when the alarm chirps. Press and hold the test button of the new hard-wired alarm until the wireless alarm chirps and its green light stops blinking. The unit will display or speak a list of rooms. Press the test button when the appropriate room is displayed or heard.

Insert batteries into the second wireless alarm. Hold the test button. Release the button when the alarm chirps. The green power light will blink.

Press and hold the test button of the first wireless alarm until the second wireless alarm chirps and the green light stops blinking. Set the second wireless alarm’s location by pressing the test button when the appropriate room is displayed or heard.