Ampac FireFinder PLUS Specifications download pdf (Page 82)

Page 76

FIREFINDER PLUS

(

AUST

)

INSTALLATION

COMMISSIONING OPERATION

12.15 Agent Release Control

Agent Release control consists of an Agent Release Module, Termination Board and an optional Local

Control Station.

12.15.1 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.

The “Agent Released” Pressure Switch (PSW) is wired to the PSW input on the Termination Board

and is used to confirm that the agent has been released. The circuitry involved in this process can be

configured to accept a normally open contact, normally closed contact, normally open mechanically

operated (manual) or is ignored (not fitted) and is selected via FACP on-site programming. If the

mechanical (manually operated) option is selected the module monitors the pressure switch input and

provides notification the agent has been released manually, initiates an alarm and illuminates the

“Agent Released “ indicator.

Manual Mode

When the system is in manual mode, then;

 The Local Control Station Inhibit indicator is lit at the FACP and all Local Control

Station’s.

 The buzzer at all Local Control Stations will sound until the inhibit button is released.

 The System Inoperative output is turned on.

 The Automatic discharge sequences are prevented from starting.

 If an automatic discharge sequence was underway and the inhibit switch is activated

(switched to manual mode) the discharge sequence is aborted and the sequence is reset.

This means the Stage 1 and Stage 2 outputs are switched off.

To manually discharge the agent the “ Lock Off Valve “ must be open and the Manual Release switch

on the Local Control Station pressed. The manual discharge sequence is;

 Manual Activation indicator is lit on the FACP and Local Control Station.

 The FACP activates its brigade alarm output.

 Stage 1 outputs are switched to +24VDC. (FIRE ALARM sign illuminated, aural alarm

sounds)

 Stage 2 outputs are switched to +24VDC. (FIRE ALARM, EVACUATE & DO NOT

ENTER signs illuminated, aural alarm sounds).

 The optional pre-release start delay is activated (Selected via FACP on-site

programming); time out and an ON Interlock signal will then operate the selected release

circuitry.

 The Agent Discharge LED on the Agent Release Module and Local Control Station will

illuminate when the Pressure Switch input on the Termination Board is activated.

 Activate gas-fired output.

Note: The Interlock Input can be defaulted to the on position by placing a 10K EOL termination

resistor across the terminals TB2. 7 / 8 of the Agent Release Module and Local Control Station.

Auto Mode

Automatic discharge is when one or two zones going into alarm initiate the agent discharge sequence.

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Ampac FireFinder PLUS Specifications Page 82

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