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Note: A “manual release” can still be initiated in “auto mode” but the LCS “Inhibit” control WILL
NOT inhibit / abort the agent release sequence.
Single Zone Activation, the following discharge sequence is executed;
➢ Automatic Activation LED is illuminated on the Agent Release Module and Local Control
Station.
➢ 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).
➢ Optional pre-release delay is started (Selected via FACP on-site programming).
➢ The delay times out and if the Interlock signal is ON, the selected circuit will activate.
➢ The Pressure Switch field input on the Termination Board is activated and the Agent
Discharge LED on the Agent Release Module and Local Control Station will be
illuminated.
➢ Activate gas-fired output.
Dual Zone Activation, if the first zone goes into alarm the following steps are initiated;
➢ The automatic activation LED on the Agent Release Module and Local Control Station will
flash.
➢ Stage 1 outputs are switch to –24VDC. [FIRE ALARM sign illuminated, aural alarm
sounds].
When the second zone goes into alarm, then the following steps occur;
➢ Automatic activation LED goes steady.
➢ Stage 1 outputs are switched to +24VDC. (FIRE ALARM & EVACUATE signs illuminated,
aural alarm sounds)
➢ Stage 2 outputs are switched to +24VDC. (DO NOT ENTER sign illuminated)
➢ Optional pre-release delay commences (Selected via FACP on-site programming).
➢ The delay times out and if the Interlock signal is on the selected circuit will activate.
➢ The Pressure Switch field input on the Termination Board is activated and the Agent
discharge LED on the Agent Release Module and Local Control Station will be
illuminated.
➢ Activate gas-fired relay output.
Service Switch
The service switch is situated on the Agent Release Module when activated causes the following;
➢ Electrically isolates the activation circuitry from the agent release device.
➢ Operates the System Inoperative output.
Note: The service switch is NOT overridden by a manual discharge.
Lock-Off Valve
When the manual lock-off valve is operated;
➢ The agent is blocked from reaching the release valve.
➢ The lock-off valve inhibit indicator LED’s on the Agent Release Module and Local Control
Station are illuminated.
➢ The system inoperative output operates.
Fault Monitoring
Fault conditions are initiated by:
➢ The Pressure Switch monitoring circuit.
➢ The Low Pressure Switch monitoring circuit.
➢ The Lock-off Valve monitoring circuit.
➢ Activation circuitry.
➢ Stage 1 outputs. (Aural & visual discharge alarms).
➢ Stage 2 outputs. (Aural & visual discharge alarms).
➢ A Zone Fault.
➢ A Fault on the interlock input.
➢ A Fault with a LCS.
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