FireFinder
™
Installation Commissioning & Operation
Page 49
10
Agent Release Control
Agent Release control consists of an Agent Release Card (ACC), Termination Board and an optional Local
Control Station.
10.1 Operation
Introduction
The Agent Release Module and Termination Board communicate with the FACP via the RS485 multi-drop
bus.
The Local Control Station communicates only with the Termination Board via a separate RS485 bus. Up to
4 Local Control Stations can be connected to one termination board.
Agent discharge operates in two modes – automatic and manual. The manual mode is selected by
pressing the Inhibit switch on any Local Control Station. To indicate the system is in manual the Inhibit LED
will be illuminated. Pressing Inhibit again will toggle or return the mode to automatic and extinguish the
Inhibit LED.
When the agent inhibit switch is operated at any LCS or the FACP then the agent inhibit indicator is
illuminated at all LCSs and the ACC on the FACP, the buzzer sounds at all LCSs and the agent can only
be released by a manual activation. This is referred to as the manual mode.
The pressure switch input on the termination board (which is used to confirm that the agent has been
released) can be configured to accept a normally open contact, normally closed contact, or ignored. This is
selected via FACP on-site programming – refer to relevant FACP Manual.
In addition the agent release add-on can monitor the pressure switch input and provide notification that the
agent has been released by a manual mechanical means.
Manual Mode
When the system is in manual mode, then;
9
The Agent Inhibit indicator is illuminated at the FACP ACC and all LCSs
9
The buzzer sounds at all LCSs until the inhibit condition is released but not at the FACP ACC.
9
System Inoperative output is turned on
9
Automatic release sequences are prevented from starting
9
If an automatic release sequence was underway and the inhibit switch is activated (switched to
manual mode), then the release sequence is aborted and the sequence is reset. This means the
stage 1 and stage 2 outputs are switched OFF.
9
The FACP treats this condition as an isolate and as such will activate the brigade isolate output,
illuminate the isolate indicator, report the condition to the LCD and operate the buzzer after 8 hours.
To manually release the agent, the manual release at the ACC or an LCS is activated. For a manual
release sequence to commence the lock-off valve and the service inhibit must be in the OFF position.
The manual release sequence is as follows:
1.
The Manual Activation indicator is illuminated on the ACC and LCSs, provided the lock-off valve and
the service inhibit are in the OFF position
2.
The FACP activates its Bell, ASE, Warning System, Plant, and Alarm outputs.
3.
Stage 1 monitored output is switched to +24VDC, and the stage 1 relay is closed
4.
Stage 2 output is switched to +24VDC, and the stage 2 relay is closed
5.
Start optional pre-release delay (Selected via FACP on-site programming – refer to relevant FACP
Manual) and turn on the stage 2 timer indicator
6.
Upon expiration of the delay, the period the interlock signal is on, and the selected activation circuit
is activated. If the interlock is in fault, then the agent will be released if the interlock signal is not
asserted within 10 seconds.
Summary of Contents for SP Series
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