EQUIPMENT: FIRECLASS Prescient III WRITTEN BY: RKP
PUBLICATION: OMFCPRES3IN CHECKED BY: AP
ISSUE No. & DATE: 0 02/02/12
PAGE 17 of 43
indication is latching and must be manually reset
via the Extinguishing Reset button.
3.18.8. EMERGENCY HOLD ACTIVE
This is a yellow LED that is normally OFF. It
indicates that the pre-discharge delay timer has
been reset & held (therefore the release of the
extinguishing gas has been suspended). The LED
pulses if the Hold input is active when the pre-
discharge delay timer is not running. The LED is
illuminated steady if the Hold input is activated or
a fault occurs on the input during the pre-
discharge delay timer running. The pulsed &
steady indications are non-latching and clear when
the input clears.
3.18.9. CIRCUIT FAULT
This is a yellow LED that is normally OFF. It
pulses to indicate that one of the circuits related to
the Extinguishing system has an open or short
circuit fault. A separate LED on the control board
inside the panel will indicate which circuit is in
fault.
3.18.10. GAS LOW
This is a yellow LED which is normally OFF. It
pulses while the Gas Low input is active, clearing
when the input is cleared.
3.18.11. GAS TRAPPED IN MANIFOLD
This is a yellow LED which is normally OFF. It
pulses while the Gas Trapped input is active,
clearing when the input is cleared.
3.18.12. ISOLATION VALVE ABNORMAL
This is a yellow LED which is normally OFF. It
pulses while the Isolation Valve monitors an
abnormal value (nominally 10k load), to indicate
valve stuck between open & closed, clearing when
the input is cleared.
3.18.13. ISOLATION VALVE CLOSED
This is a yellow LED which is normally OFF. It
pulses while the Isolation Valve monitors a Closed
value (nominally 680R load), clearing when the
input is cleared.
3.18.14. MANUAL RELEASE
FAULT/DISABLED
This is a yellow LED which is normally OFF. It
pulses if the Manual Release zone input is in fault
or the internal circuit to the door mounted Manual
Release is in fault, clearing when the fault is
cleared. A separate fault LED for each circuit is
also illuminated on the internal control board. The
Manual Release Fault/Disabled LED is illuminated
steady when the Manual Release facility is
disabled.
3.18.15. EXTINGUISHING DISABLED
This is a yellow LED which is normally OFF. It is
illuminated steady when the Actuators are
disabled. [Note: When the actuators are disabled
the Extinguishing Sounder circuit is automatically
disabled].
3.18.16. GAS RELEASED SIGNAL DISABLED
This is a yellow LED which is normally OFF. It is
illuminated steady when the Gas Released Signal
output is disabled.
3.18.17. SHUTDOWN OUTPUTS DISABLED
This is a yellow LED which is normally OFF. It is
illuminated steady when the shutdown outputs are
disabled. [All three 1
st
Stage, 2
nd
Stage & 3
rd
Stage
shutdown outputs are disabled together].
3.18.18. SECONDS TO DISCHARGE
This is a 2-digit numeric display. It is normally
blank. When the pre-discharge timer is running,
the remaining seconds left to discharge are
displayed.
In CONFIG SLU mode, the 2-digit display allows
the SLU type codes to be programmed into the
panel (see section 4.2.3).
3.19 Display Board - User Controls
The Display Board provides user controls via
buttons behind the membrane of the display board.
All buttons except for TEST (for Test Display) are
disabled until the ACCESS CONTROLS key-switch
is rotated to the ON position.
The panel acknowledges a button press by
sounding the internal buzzer briefly.
The following controls are available:
3.19.1. SILENCE ALARMS
This button silences the general sounder circuits
and/or silences the extinguishing sounder circuit
when possible. Silencing of the extinguishing
sounder circuit is inhibited until the panel enters
the Gas Released condition or the Abort input is
activated.
The attached yellow LED is normally OFF. It
pulses when it is possible to silence any of the
sounder circuits and is illuminated steady to
indicate silenceable sounder circuits have been
silenced.
3.19.2. RESOUND ALARMS
This button allows previously silenced alarm
circuits to be resounded.
3.19.3. FIRE RESET
This button controls the resetting of fault and fire
conditions on the Fire Alarm section of the panel.
Faults common to the Fire section & the
Extinguishing section can also be reset with this
button.
3.19.4. EXTINGUISHING RESET
This button controls the resetting of fault and
active conditions on the Extinguishing section of
the panel. Faults common to the Fire section & the
Extinguishing section can also be reset with this
button. The resetting of the Extinguishing system
can be inhibited up to 30 minutes once the
extinguishing system has been activated and the
accompanying yellow LED is illuminated steady to
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