FireClass Prescient III - Introduction

EQUIPMENT: FIRECLASS Prescient III WRITTEN BY: RKP
PUBLICATION: OMFCPRES3IN CHECKED BY: AP
ISSUE No. & DATE: 0 02/02/12
PAGE 3 of 43
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 Prescient III also
incorporates the relevant recommendations of the
British Code of Practice BS7273-1:2000.
The Prescient III is fully compliant with the
mandatory requirements of EN54 parts 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 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
triggering signal from an f.d.a.s. (Fire detection
Zones 1 & 2) and an input triggering signal
from manual triggering 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 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:
a. 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. q) 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 Prescient III is fully compliant with the relevant
recommendations of BS 7273-1:2000. The following
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 Prescient III integrates the functions of a fire
alarm system and a gas extinguishing system. The
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 Prescient III
also provides a facility for initiating the release of
extinguishing gas manually.
The Prescient III incorporates a 5 Amp switch-mode
power supply with Power Factor correction.
2. General Description
The Prescient III is housed in a metal enclosure
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) Manually operated 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.
5) Two fully monitored Actuator circuits.