Dual Detector, Pre-Signal, And Abort Switch With No Delay; Introduction - Simplex 4010 Applications Manual

Dual Detector, Pre-Signal, and Abort Switch with No Delay

Introduction

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The application described in this section provides the following suppression
operation.
•
Activation of the suppression release system occurs when either two
automatic initiating devices (detectors) or a single manual release point
(pull station) are activated. Release of the suppression agent can be delayed
for up to 60 seconds after the second automatic initiating device activates
and for up to 30 seconds after a pull station activates. These delays are
configurable via system options.
•
At any time prior to the actual release of the agent, an operator can prevent
the release of the suppression agent by pressing an abort switch. Release of
the suppression agent is prevented for the duration of time this switch is
held. Release of the suppression agent occurs immediately after release of
the abort switch, assuming the timers discussed in the previous bullet have
expired. Operators should be made aware that if the alarm is false, clearing
the alarm condition and resetting the system prior to releasing the switch
prevents agent discharge.
•
NAC appliances operate in a slightly different manner depending on
whether the activated device is an automatic initiating device or a pull
station.
- Automatic Initiating Devices. When the first automatic initiating
device activates, the NACs in the suppression release area sound a
pre-signal (Slow March Time). When a second automatic initiating
device activates, this tone converts to a Fast March Time tone. At the
time of agent discharge, the tones convert to Steady, indicating that the
agent has been released.
- Manual Release Point (pull station). When a manual release point
activates, the NACs in the suppression area sound a Fast March Tone.
At the time of agent discharge, the tone converts to a Steady tone,
indicating that the agent has been released.
Figure 3-3 shows a timeline for this application. First stage signals activate
following the first stage alarm condition (which is always an automatic initiating
device). Second stage signals activate following the activation of either a
second automatic initiating device or following activation of a manual release
station. The second alarm condition (or the manual pull station) also triggers the
optional release timer, if used. This timer ranges from 0-30 seconds for a
manual release station and 0-60 seconds for an automatic initiating device.
Suppression is delayed until the release timer expires or the abort switch is
released, at which time the signals convert to a discharge tone and the solenoid
activates.
3-5
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