Page 6
The yellow wire is used only for multiple station operations with USI ELECTRIC Model
alarms only. Connecting this yellow wire to any other circuits may result in damage and
alarm malfunction. When alarms are interconnected, all alarms must be powered from a
single AC branch circuit. If local codes do not permit, be sure the neutral wire is common
to both phases. The maximum wire run distance between the first and last alarm/device
in an interconnected system is 1,000 feet. NOTE: Use standard household wire (18 gauge
or larger, rated at least 300V, as required by local codes) available at all electrical supply/
hardware stores.
The wiring to be used shall be in accordance with the provisions of Articles 210 and
300.3(B) of the National Electrical Code, ANSI/NFPA 70. In addition, the resistance of the
interconnecting wiring shall be a maximum of 10 Ohms.
2. Attach the mounting bracket to the electrical junction box.
3. Activate the Permanent Power backup battery feature by removing and discarding the battery
pull tab. The alarm will sound one long beep to confirm it is powered up. Once activated, the
alarm cannot be turned off without permanent deactivation. The alarm will remain on for the
next ten years under normal operating conditions. Press the Test/Silence button. The alarm
will sound 3 beeps and the red SMK LED will blink in sync with the cycle of 3 beeps and turn
off.
4. Plug the AC QUICK CONNECTOR into the alarm base. Push and twist the alarm clockwise
onto the mounting bracket.
5. See "OPTIONAL TAMPER RESISTANT FEATURE" and "TO ACTIVATE THE LOCKING
FEATURE" instructions on Page 4.
6. Turn on AC power and check the LED's for proper operation. The green LED should be on to indicate
AC power. The red LED blinks on once approx. every 2 minutes to indicate proper operation.
120 VAC 60Hz
100mA Max.
OPERATION, TESTING & MAINTENANCE
NORMAL OPERATION:
The alarm is operating once the AC power is connected, the battery
pull tab has been removed, and the alarm has sounded one long beep. The green LED is on, the
red LED blinks on once approximately every two minutes. The horn is silent. When products of
combustion are sensed, the alarm sounds a loud alarm which continues until the air is cleared.
This alarm incorporates the NFPA recognized horn signal for evacuation. During alarm mode, the
horn produces three long beeps followed by a two second pause and then continually repeats.
READY/ACTIVE CONDITION:
The red LED blinks on once approx. every 2 minutes to indicate
the alarm is properly functioning.
LOCAL ORIGINATING ALARM CONDITION:
The alarm emits a loud, pulsating alarm sound and
the red LED blinks in sync with the alarm sound.
NON-ORIGINATING ALARM CONDITION:
The red LED is off and the alarm emits a loud,
pulsating alarm.
GREEN LED:
The green LED is on whenever AC power is turned on.
NUISANCE ALARMS:
The smoke alarm is designed to minimize nuisance alarms. Smoking will
not normally set off the alarm unless smoke is blown directly into the smoke alarm. Combustion
particles from cooking may set off the alarm if the smoke alarm is located close to the kitchen
cooking surface. Large quantities of combustion particles are generated from spills or broiling.
If the smoke alarm does sound, check for fires first. If a fire is discovered, get out and call the fire
department. If no fire is present, check to see if one of the reasons listed above may have caused
the alarm. Use the Silence Feature if it is a nuisance alarm, or reset the alarm by pressing and
holding the test button for ten seconds. Refer to RESET on Page 7.
