MAN1544-5
41
➢
If the agent add-on has been assigned a zone number, then the brigade and supervisory outputs
associated with that zone shall be activated (external alarm (bell), warning system, plant (ACF), ASE,
Alarm 1 and Alarm 2).
➢
When the FACP reset control is activated
–
the automatic 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 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 automatic activation indicators at the ARC and LCSs are extinguished
and the Stage 1 and Stage 2 outputs are switched OFF. The system inoperative output shall be activated.
If the trigger zone is isolated during the sequence, then the sequence is aborted. This means the automatic
activation indicators at the ARC and LCSs are extinguished and the Stage 1 and Stage 2 outputs are
switched OFF. The system inoperative output shall be activated. The trigger zone isolated indictor shall be
illuminated.
If the lock-off valve or service inhibit switch 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
If the trigger zone is isolated 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. The
trigger zone isolated indicator shall be illuminated.
6.6.2
Dual Zone Activation
With dual zone activation, when the first zone goes into alarm the following steps occur;
➢
The automatic activation LED at the ARC and LCSs flashes
➢
Stage 1 output is switch to
–
24VDC, and the stage 1 relay output is closed
When the second zone goes into alarm, then the following steps occur;
➢
Automatic activation LED goes steady
➢
Stage 1 output is switched to +24VDC
➢
Stage 2 output is switched to +24VDC, and stage 2 relay output is closed
➢
Optional pre-release delay commences (Selected via FACP on-site programming
–
refer to relevant
FACP Manual).
➢
Upon expiration of a delay the interlock signal is on and then activate the selected circuit. If the
interlock is in fault, then the agent will be released if the interlock signal is not asserted within 10
seconds.
➢
The agent release LED on the ARC and LCSs is illuminated 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).
➢
The gas-fired relay output is then activated.
