Using the Configurator
211
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Modified Non-Silenceable Waterflow Alarm Operation:
A Modified Non-Silenceable
Waterflow Alarm Operation is considered to be any system whereby activation of the
signal silence switch following receipt of a non-waterflow alarm is partially inhibited: the
audible signals are deactivated and the visual signals remain activated. The activation of
a waterflow alarm shall inhibit the signal silencing of the audible and/or visual signals.
Activation of the Signal Silence button when the panel is in alarm turns on the Signal Silence
indicator and deactivates any silenceable NACs. Non-silenceable circuits are unaffected.
Signals will resound upon any subsequent alarm. This button does not function during any
configured signal silence inhibit timer period. It also does not function if the signals are active
as a result of a fire drill.
The
NS
(Non-Silenceable) flag is intended as an inhibitor to the signal silence command in
accordance with certain jurisdictions where silencing of audible and/or visual notification
appliance circuits during a waterflow alarm may not be permitted.
Where driven by the activation of an input zone with an
NS
flag, audible and/or visual
notification circuits shall continue to operate following the manual activation of the signal
silence switch. Only visual and audible notification circuits drive by silenceable input zones (no
NS
flag) shall be silenced.
It is recommended that the
NS
flag not be applied directly to the notification appliance circuits.
19.55.1 Signal Silence Operation (Single Stage)
Below is a description of the Signal Silence operation in accordance with requirements.
In a single stage system, all alarm inputs are treated in a similar manner. Alarm inputs include
any of the following: Non-verified alarm, verified alarm, water-flow alarm, and general alarm
input circuits. Upon receipt of an
initial alarm input
, the panel shall cause the following:
•
The active alarm input is displayed within the Main Display Alarm Queue.
•
The internal piezo buzzer sounds steadily.
•
The Common Alarm Status is active.
•
The on-board Common Alarm Relay is closed (Active).
•
Audible and/or Visual signals associated with the input are activated at the evacuation
rate.
While in alarm, and the 1-minute signal silence inhibit has expired (where applicable),
pressing the
Signal Silence Switch
will cause the following events to occur (
Basic Signal
Silence Operation
):
•
Signal Silence switch is activated.
•
Signal Silence switch LED is illuminated (flashing yellow).
•
A Signal Silence trouble event is reported for each node currently silenced.
•
Audible and/or Visual signals become inactive.
A Subsequent alarm
shall cause the following:
•
Signal Silence switch is de-activated and the Signal Silence switch LED is off.
•
The Signal Silence trouble event(s) are restored.
•
Audible and/or Visual signals are reactivated.
