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Indicators, Controls, and Operation
68
Circuit Types
The term
circuits
refers to an actual electrical interface, either initiating (detection) or indicating (signal). The term
zone
is a
logical concept for a fire alarm protected area, and will consist of at least one circuit. Often the terms zone and circuit are used
interchangeably, but in this manual the term circuit is used.
I nitiating ( Detection) Circuit Type
I nitiating ( Detection) Circuit
Type
Description
Non-Verified Alarm
This is a "normal" type of alarm which may have pull stations, smoke detectors, or heat
detectors attached. Any activation of these devices will immediately result in an alarm
condition in the fire alarm control panel. An alarm condition causes the associated
circuit Status LED and the Common Alarm LED to illuminate red.
Verified Alarm
These alarms are verified by a reset and timing procedure, and may have Manual
Stations, smoke detectors attached. Any activation of Manual Stations will result in an
alarm condition in the fire alarm control panel within four seconds. Smoke detectors will
be verified for a real alarm within 60 seconds depending upon the start-up time of the
smoke detectors being used. If four seconds is too long a response time for pull
stations, then they should be wired separately on a non-verified alarm circuit. An alarm
condition causes the associated circuit Status LED and the Common Alarm LED to
illuminate red. Verified Alarm is not permitted for heat detectors, 4-wire smoke detectors
and smoke detectors with built-in alarm verification. Refer to Appendix D Alarm
Verification for details.
Water-Flow Alarm
An alarm for water-flow sensors. These alarms are identical to normal non-verified
alarms except that any NACs programmed to these circuits (all are by default) are non-
silenceable. Also, if water-flow retard operation is enabled, then these circuits are
sampled every one second; if ten samples are active within any 15 second interval, the
water-flow alarm is confirmed and processed. An alarm condition causes the associated
circuit Status LED and the Common Alarm LED to illuminate red.
Note: Do not use the retard operation with any external retarding device;
maximum retard may not exceed 120 seconds.
Sprinkler Alarm
An alarm for sprinkler flow sensors. These alarms are identical to normal non-verified
alarms unless the water-flow retard operation is enabled. If water-flow retard operation
is enabled, then these circuits are sampled every one second; if ten samples are active
within any 15 second interval, the sprinkler alarm is confirmed and processed. An alarm
condition causes the associated circuit Status LED and the Common Alarm LED to
illuminate red.
Note: Do not use the retard operation with any external retarding device;
maximum retard may not exceed 120 seconds.
General Alarm
These alarms provide remote general alarm such as for remote key switches. In a two
stage system, these inputs perform exactly the same function as the front panel or
remote annunciator General Alarm button. In a single stage system, these inputs act the
same as non-verified alarms, but if correlations are enabled, general alarm initiating
circuits are correlated to
all
NACs.
Non-Latching Supervisory
These alarms are for supervisory devices. An activation on these circuits will cause the
Circuit Status LED and the Common Supervisory LED to illuminate amber. The buzzer
will sound continuously. If the circuit activation is removed, the supervisory condition will
clear (so long as there are no other supervisory conditions in the system) and the circuit
Status LED will extinguish.
Latching Supervisory
These alarms are for supervisory devices. An activation on these circuits will cause the
Circuit Status LED and the Common Supervisory LED to illuminate amber. The buzzer
will sound continuously. If the circuit activation is removed, the Supervisory condition will
not
clear.