1-8
The applications that trigger the releasing sequence based on the activation of a single detector
include all applications that do not use cross zoning (see Table 1-1 for a list of the available
applications).
As shown in the
Figure 1-1, activation of a single initiating device immediately activates the
Notification Appliance Circuits (NACs) and starts an optional Automatic Release Delay Timer.
This optional delay timer, which has a programmable range of zero to 60 seconds, delays the
activation of the Releasing Appliance Circuits (RACs), thus delaying release of the agent. When
the timer expires, the RACs activate, releasing the agent.
Important Notes:
The abort switch can be used only prior to the expiration of the delay timer.
In application 11 RAC2 turns on immediately when an alarm is activated. This is the
pre-action RAC. RAC1 turns on when the timer expires.
Figure 1-1. Releasing Sequence for Single Detector Alarm Activation
Continued on next page
Automatic Release
Delay Timer*
(0 - 60 Secs)
NAC1 On Steady
NAC2 120 BPM
Activate Alarm Relay
Sound Panel Piezo
Discharge Signals
NAC1 On Steady
NAC2 On Steady
RAC Activation (Agent Discharge)
1st
Alarm
Received
Alarm
Silence
Alarm
Reset
*If timer is set to 0, release of the agent and
activation of discharge signals occurs immediately
after alarm activation.
Abort
Switch
and
Clear/Reset
Window
Supported Applications, Continued
Releasing
Sequence for
Single Detector
Activation
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