Timeline For Release Triggered By Dual Detector Activation - Simplex 4004R Installation, Programming And Operating Instructions

4004R Fire Alarm installation, programming, and operating instructions
Figure 1: Timeline for single device suppression release
3.2.3

Timeline for release triggered by dual detector activation

Cross-zoned applications require that two automatic initiating devices on different zones enter an alarm state before the releasing
appliance can activate. Figure 2 illustrates the automatic releasing sequence following activation of detectors on both zones.
In the example, the first detector enters an alarm state, triggering the activation of the piezo, alarm relay, and the notification appliances,
horns, bells, strobes, and so on attached to NAC1 and NAC2. When the second detector enters an alarm state, the system starts an
optional Automatic Release Delay Timer and changes the pattern of audible tones on NAC2 to a faster cadence evacuation signal. When
the timer expires, the cadence of the NACs changes to On Steady and the RACs activate.
Note:
• If the delay timer is set to 0, release immediately follows second, cross-zoned, alarm activation.
• The abort switch can only be used for the duration of time specified by the delay timer.
• In application 10, RAC 2 turns on immediately when the 2nd alarm is brought in. This is the pre-action RAC. RAC 1 turns on when the
timer expires.
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