MAN1544-5
40
➢
Light the agent release indicator on the ARC at the FACP and LCSs when the pressure switch input
on the termination board is activated or immediately (depends on the pressure switch
configuration
–
refer to FACP on-site programming).
➢
Activate gas-fired relay output.
➢
When the FACP reset control is activated
–
the manual activation indicator, agent discharge
indicator, stage 2 timer running are extinguished, and the stage 1, stage 2, selected activation
circuit and gas fired output are switched off (to 0VDC).
If the agent select button is operated at the ARC once the agent has been released, then the newly selected
activation circuit is operated immediately. The manual release facility will cause the release of the agent
unless there is a fault on the activation circuit, the lock-off valve has been operated or the service inhibit
control is active.
The interlock input can be defaulted to the ON position by an appropriate termination resistor.
If the lock-off valve or service inhibit is activated to the ON position during the sequence, then the
sequence is aborted. This means the manual activation indicators at the ARC and LCSs are extinguished, the
Stage 1 and Stage 2 outputs are switched OFF and the FACP Bell, ASE, Warning System, Plant and Alarm
outputs are switched OFF. The system inoperative output shall turn on.
If the lock-off valve or the service inhibit is operated after the agent has been released then there is no
effect on the stage 1 and stage 2 outputs and the selected activation circuit. The system inoperative output
shall be activated.
6.6
Auto Mode
Automatic release is when one or two zones going into alarm initiate the agent release sequence.
For an automatic release sequence to commence the lock-off valve and the service inhibit switch must both
be in the OFF position.
6.6.1
Single Zone Activation
With single zone activation, when the zone goes into alarm, then the following release sequence is
executed:
➢
Automatic activation LED is illuminated on the ARC and LCS’s
➢
Stage 1 output is switched to +24VDC, and the stage 1 relay output is closed
➢
Stage 2 output is switched to +24VDC, and the stage 2 relay output is closed
➢
Start optional pre-release delay (Selected via FACP on-site programming
–
refer to relevant FACP
Manual) and turn on the stage 2 timer indicator.
➢
Upon expiration of delay, wait till the interlock signal is on, and then activate the selected
activation circuit. If the interlock is in fault, then the agent will be released if the interlock signal is
not asserted within 10 seconds.
➢
Illuminate the agent release LED on the ARC and LCS’s when the pressure switch input on the
termination card is activated or immediately (depends on the pressure switch configuration
–
refer
to FACP on-site programming).
➢
Activate gas-fired relay output.
