The yellow wire is used only for multiple station operations with USI ELECTRIC or UNIVERSAL
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.
Plug the AC QUICK CONNECTOR into the alarm base. Push and twist the alarm clockwise
onto the mounting bracket.
4.
See "OPTIONAL TAMPER RESISTANT FEATURE" and "TO ACTIVATE THE LOCKING
FEATURE" instructions on Page 7.
5.
Turn on AC power and check the LED's for proper operation. The green LED should be on and
blink off approx. every 20 seconds to indicate AC power.
IMPORTANT!
The battery backup is designed to provide short-term emergency power to the Smoke, CO and Gas
Alarm. Actual backup time depends on the strength (freshness) of the battery. The battery backup
will not work unless a good battery is properly installed.
When the alarm utilizes battery backup power, the natural gas sensor will operate the alarm and will
sample less frequently to extend battery life. Natural gas could be present during this period between
samples without the alarm sounding, especially if there is a rapid buildup of natural gas.
NOTE: It is best to “reset” the alams before initial test is performed. See Page 10 for reset procedures.
The following alarms cannot be reset through an interconnected system because they do
not have QUICK FIND
®
Alarm Origination: USI-1103
,
USI-1203, USI-1204, USI-1208 (Part
#USI-1209
),
USI-1213, USI-5204, USI-5208, USI-5213, USI-3204, USI-2430, SS-785, SS-790,
SS-795, SS-2795, SS-2790, SS-2785, SS-2895, USI-7385, USI-7390, USI-7485, USI-7490, CD-
9385, CD-9390, CD-9485, CD-9490, CD-9795, USI-7795.
Interconnected CO alarms or CO alarm circuit of combination smoke and CO and Natural Gas
alarms will only respond if a CO alarm / event initiates the alarm. All other alarms remain silent.
Interconnected combination Natural Gas Alarms will only respond if a natural gas event
initiated the alarm. All other alarms remain silent.
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 and Natural Gas alarms remain silent.
Note that smoke alarms without battery backup will not respond during an AC power failure.
NOTE: Relay Modules/USI-960 will not respond if a CO alarm / event initiates the alarm.
120 VAC 60Hz
100mA Max.
Page 9
