EQUIPMENT: FIRECLASS Prescient III WRITTEN BY: RKP
PUBLICATION: OMFCPRES3IN CHECKED BY: AP
ISSUE No. & DATE: 0 02/02/12
PAGE 21 of 43
MANUAL ONLY mode. When Manual Release is
initiated the following occurs:
1. MANUAL RELEASE LED pulses
2. The MANUAL RELEASE output operates
3. The SYSTEM ACTIVATED LED illuminates
steady (activated condition)
4. The 1
st
Stage Shutdown & 2
nd
Stage Shutdown
outputs operate
5. The pre-discharge delay timer starts
6. The Extinguishing System Reset Inhibit timer
starts and the INHIBITED LED illuminates.
7. The Extinguishing Sounder circuit pulses 1
second on, 1 second off.
In this state, the buzzer can be silenced.
4.8 Activated Condition
The activated condition normally occurs when the
Manual Release is activated (see section 4.7) or
when zones 1 & 2 register a fire condition and the
panel is in the Automatic & Manual mode (see
section 4.6.2). During this condition:
1. The 1
st
Stage Shutdown & 2
nd
Stage Shutdown
outputs operate
2. The pre-discharge delay timer starts and the
time to discharge is counted down on the
Seconds To Discharge display.
3. The Extinguishing System Reset Inhibit timer
starts and the INHIBITED LED illuminates (if
configured to a non-zero value)
4. The Extinguishing Sounder circuit pulses 1
second on, 1 second off.
The Extinguishing Sounders cannot be silenced.
The Extinguishing System cannot be reset while the
Reset Inhibit timer is active (up to 30 minutes).
When the pre-discharge delay timer ends:
1. The SECONDS TO DISCHARGE display
clears
2. The 3
rd
Stage Shutdown output operates
3. The actuator circuits operate
4. The Extinguishing Sounder circuit pulses 1
second on, 1 second off.
When the Gas Released input is activated (or when
the actuator circuits are operated and the NO
DISCHARGE PRESSURE SWITCH DIL switch is in
the ON position):
1. The Gas Released Signal output operates
2. The GAS RELEASED LED & GAS RELEASED
SIGNAL ACTIVE LED operate
3. The SILENCE ALARMS LED pulses
4. The Extinguishing Sounder circuit operates
continuously.
4.8.1. Emergency Hold Operation
Operation of an Emergency Hold switch while the
pre-discharge delay timer is running will stop the
pre-discharge delay timer and reset it to the
configured value. The Extinguishing Sounder
circuit will change to pulsing 1 second on, 5
seconds off. The timer will restart on release of
the Emergency Hold switch & the Extinguishing
Sounder circuit will return to pulsing 1 second on,
1 second off. The Hold output will operate while
the Hold switch is operated.
4.8.2. Emergency Abort Operation
Operation of an Emergency Abort switch (or a
fault on the Emergency Abort input) will abort the
extinguishant release. The pre-discharge delay
timer will be cancelled, the Extinguishing System
Reset Inhibit will be cancelled, the actuator circuits
will be de-energised, the Extinguishing Sounder
circuit will be silenced & the Abort output will
operate.
The Abort condition will remain until the
Extinguishing System is reset.
5. Technical Specification
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