User's Manual

Page 4
OPERATION, TESTING & MAINTENANCE
OPERATION: The smoke alarm is operating once the power is connected and turned on (the
battery must also be installed). When products of combustion are sensed, the unit sounds a loud
alarm which continues until the air is cleared.
This alarm incorporates the internationally recognized horn signal for evacuation. During alarm
mode, the horn produces three short beeps followed by a two second pause and then repeats.
STANDBY CONDITION: The red LED (USI-1227L only) flashes once every 40-60 seconds to
indicate the unit is properly functioning.
LOCAL ALARM CONDITION: The red LED (USI-1227L only) flashes rapidly and the unit emits a
loud, pulsating alarm sound.
TESTING: Test by pushing the test button on the smoke alarm cover until the alarm sounds, then
release. The alarm sounds if all electronic circuitry, horn and battery are working. The alarm may
continue to sound for up to 10 seconds after the button is released. If no alarm sounds, the unit
may have a defective battery or other failure. Test the smoke alarm weekly to assure proper
operation.
NEVER use an open flame of any kind to test this unit. You might accidentally damage or
set fire to the unit or to your home. The built-in test switch accurately tests the unit's
operation as required by Underwriters Laboratories Inc. (UL).
If you choose to use an aerosol smoke product to test the smoke alarm, be certain to use
one that has been Listed to Underwriters Laboratories, Inc. Safety Standards and use it
only as directed. Use of non-UL Listed products or improper use of UL Listed products
may affect the smoke alarm's sensitivity.
MAINTENANCE: The smoke alarm is virtually maintenance free. However, under dusty conditions,
a vacuum hose may be used to clear the sensing chamber of dust.
BATTERY REPLACEMENT
The smoke alarm uses a 9 Volt carbon-zinc battery. The battery should last for at least one year
under normal operating conditions. The smoke alarm has a low battery indicator, an audible "beep."
It will operate at 30-40 second intervals for a minimum of 7 days. When this indication occurs,
replace the battery with an Alkaline type (Eveready Energizer #522, Duracell #MN1604), Carbon-
Zinc type (Gold Peak #1604P, #1604S, Eveready #216).
REPAIRS AND SERVICES
The smoke alarm contains less than 1 microcurie (37 kilobecquerel) of Americium 241, a radioactive
material. The distribution of these ionization-type smoke alarms is licensed by the U.S.
Nuclear Regulatory Commission; the consumer is exempt from any licensing or
requirements. If the smoke alarm is defective in any way, do not tamper with the unit. Return the
unit for servicing. (See warranty for instructions or in-warranty returns.) There will be a service
charge for repairing out of warranty units.