UTC Fire & Security Americas Corporation Inc 778A-SMOKE User Manual

1

 4300 Series
Wireless Smoke Detector

The ESL smoke alarm/detector is a Learn Mode



, wireless

sensor that uses photoelectric technology with a self
contained alarm siren, a low battery annunciator, and a
status LED. The smoke alarm/detector is part of a security/
fire alarm system and communicates with the system
control panel.

Depending on the model, the smoke alarm/detector
provides the following features:

Self-diagnostics.  The ESL Universal Series smokes monitor
their own sensitivity and operational status. If the smoke
alarm/detector drifts out of the UL listed sensitivity range
or fails internal diagnostics, it extinguishes its LED and
sends a trouble signal to the control panel.

Base tamper switch sends a trouble signal transmission to
the control panel when the smoke alarm/detector is
removed from its mounting base.

Integrated fixed 135°F temperature and rate of rise heat
detector trips an alarm based on high temperature detected
or rapidly rising temperature rate (15° minimum) (models
562STU and 572STU only).

Depending on the model, the smoke alarm/detector
transmits the following signals to the control panel:

• Alarm
• Alarm restore
• Tamper

NX Series
Wireless Smoke Alarm/Detector

U

L



• Low battery
• Trouble signal
• Supervisory

Selecting a suitable location is critical to the operation of
smoke alarms/detectors.  This equipment should be
installed in accordance with the National Fire Protection
Association’s (NFPA) Standard 72.  See Figure 2.

 LED

Test/Silence button

Sounder

A-8-1.2.1.a  Where to Locate the Required Smoke
Alarms/Detectors in Existing Construction.

The major threat from fire in a family living unit occurs at
night when everyone is asleep. The principal threat to
persons in sleeping areas comes from fires in the
remainder of the unit. Therefore, a smoke alarm/
detector(s) is best located between the bedroom areas
and the rest of the unit. In units with only one bedroom
area on one floor, the smoke alarm/detector(s) should be
located as shown in Figure 2 A.

In family living units with more than one bedroom area or
with more than one floor, more than one smoke alarm/
detector is required, as shown in Figure 2 B.
In addition to smoke alarms/detectors outside of the
sleeping areas, the installation of a smoke alarm/detector
on each additional story of the family living unit,
including the basement, is required. These installations
are shown in Figure 2 C. The living area smoke alarm/
detector should be installed in the living room or near
the stairway to the upper level, or in both locations. The
basement smoke alarm/detector should be installed in
close proximity to the stairway leading to the floor
above. Where installed on an open-joisted ceiling, the
alarm/detector should be placed on the bottom of the
joists. The detector should be positioned relative to the
stairway to intercept smoke coming from a fire in the
basement before the smoke enters the stairway.

Optional temperature sensor