For units that are used as single alarms, do not connect the yellow wire to anything. Insulate
this wire (tape it) in place to make certain the yellow wire cannot contact any metal parts.
This alarm can share the interconnect wire of carbon monoxide, smoke and heat alarms. The
alarm will automatically sound a smoke alarm signal if smoke is detected by this unit or any
other interconnected smoke alarm, even if the unit is already detecting carbon monoxide and
sounding the carbon monoxide alarm signal.
Interconnected units can provide earlier warning of fire than stand-alone units, especially if a
fire starts in a remote area of the dwelling. This combination alarm may be interconnected
with as many as 11 other USI ELECTRIC model smoke alarms such as USI-1103, USI-1203,
USI-1204, USI-1209, USI-1213, USI-2204, USI-3204, USI-5204 and 6 other units which may be a
combination of Carbon Monoxide Alarms such as USI-7385, USI-7390, USI-7485, USI-7490,
Heat Alarms/USI-2430 or Relay Modules/USI-960 for a total of not more than 18 interconnected
devices.
Interconnected CO alarms will only respond if a CO alarm/event initiates the alarm. All other
alarms remain silent.
NOTE: Relay modules/USI-960 will not respond if a CO alarm/event initiates the alarm.
Interconnected smoke alarms, heat alarms and relay modules will only respond if a smoke
alarm/event or heat alarm/event initiates the alarm. All CO alarms remain silent.
NOTE: Units without battery backup will not respond during an AC power failure.
Page 7
The yellow wire is used only for multiple station operation with USI ELECTRIC Model alarms
only. Connecting this yellow wire to any other circuits may result in damage. When alarms
are interconnected, all units 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.
3.
Attach the mounting plate to the electrical junction box.
4.
Plug the AC QUICK CONNECTOR into the alarm base. Push and turn the alarm clockwise onto
the mounting plate.
INPUT:
120 VAC
60 HZ
100 mA
