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Application, Installation & Commissioning Doc. version 2
2 Overview & General Description
FIRECLASS Prescient III
2
Overview & General Description
2.1
Introduction
The
FIRECLASS Prescient III
Gas Extinguishing
Control Panel is a stand-alone panel intended for use
with gas extinguishing systems. It has been designed
and approved to the European Standard EN 12094-
1:2003, as well as the relevant parts of EN54-2:1997 &
EN54-4:1997. The FIRECLASS Prescient III panel also
incorporates the relevant recommendations of the Brit-
ish Code of Practice BS7273-1:2000.
The FIRECLASS Prescient III is fully compliant with the
mandatory requirements of EN54-2 and 4 along with the
following options with requirements:
1
EN54-2:1997 Clause 7.8
Outputs to fire alarm
devices (sounders).
2
EN54-2:1997 Clause 7.9
Outputs to fire alarm
routing equipment.
3
EN54-2:1997 Clause 8.9
Output to fault warning
routing equipment.
4
EN54-2:1997 Clause 10
Test condition.
The FIRECLASS Prescient III provides the following
compulsory functions of BSEN 12094-1:2003 as listed
in
clause 4.3.2
:
1
a) Reception & processing of at least one input trig-
gering signal from an f.d.a.s. (Fire detection Zones 1
& 2) and an input triggering signal from manual trig-
gering device(s) connected directly to the e.c.d.
(Manual Release input).
2
b) Transmission of the extinguishing signal (Actuator
circuits 1 & 2)
3
c) Activation of Alarm devices (Extinguishing
Sounder circuit)
4
d) Indication of each condition unambiguously (LEDs
& internal buzzer).
5
e) Transmission of the information of the incorrect
status of components and of the information of the
fault warning condition (Fault Signal Output).
6
f) Transmission of the information of the released
condition (Gas Released Output)
The FIRECLASS Prescient III provides the following
optional functions of BSEN 12094-1:2003 as listed in
clause 4.3.2:
1
g) Extinguishing system delay.
2
h) Reception of a signal representing the flow of
extinguishing agent (Discharged).
3
i) Monitoring of status of components:
– Low pressure/low weight
4
j) Reception of signal from an emergency hold
device.
5
k) Separate monitoring of the status of non-electrical
disable device(s) (Isolation valve).
6
n) Input from auto/manual selector switches.
7
o) Transmission of a triggering signal to equipment
within the fire extinguishing system:
b) Optical warning devices (Status indicators).
8
p) Transmission of signals to equipment outside the
fire extinguishing system (Shut downs).
9
r) Reception of signal from an emergency abort
device.
10 u) Activation of alarm devices with different signals.
(2-stage sounders).
The Environmental Class as defined by clause 4.2 is:
Class A: temperature range -5 to +40 Deg C.
The FIRECLASS Prescient III is fully compliant with the
relevant recommendations of BS 7273-1:2000. The fol-
lowing safety critical aspects have been addressed:
1
6.1.2
Avoidance of accidental discharge.
2
6.4.3
A single short circuit in connections shall not
cause an extinguishant release.
3
6.4.4
Protection against over voltages which could
cause an extinguishant release.
The FIRECLASS Prescient III integrates the functions of
a fire alarm system and a gas extinguishing system. The
FIRECLASS Prescient III monitors one extinguishing
area and one non-extinguishing area for fire conditions
and gives an appropriate audible and visual indication.
Zones 1 & 2 are used for coincident detection in the
extinguishing area and can be used to automatically
release the extinguishing gas. The Auxiliary zone only
provides an alarm indication. The FIRECLASS Prescient
III also provides a facility for initiating the release of
extinguishing gas manually.
The FIRECLASS Prescient III incorporates with a 5 Amp
switch-mode power supply with Power Factor correc-
tion.
2.2
General Description
The FIRECLASS Prescient III is housed in a metal enclo-
sure with a Manual Release facility mounted on the
door.
The following functions are available on the front of the
panel:
1
Visual Indication of panel status via LEDs:
2
Numerical Display for the Extinguishant Release
Timer.
3
Buttons for User Control.
4
Manual Extinguishant Release unit
The following functions are available inside the panel:
1
Three fully monitored Detection circuits.
2
One fully monitored Manual Release circuit.
3
Two fully monitored General Sounder circuits.
4
One fully monitored Extinguishing Sounder circuit.
