Edwards Signaling 2400 Series - Manual (Page 13)

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2.0 APPLICATION
The 2412, 2414, and 2418 panels are suitable for small to medium size buildings, requiring from two to
eight Initiating Device Circuits (IDCs), and two Indicating Appliance Circuits (IACs).
2.1 Fire Alarm System Limitations
Fire Alarm Systems provide the occupants of a facility with early warning of smoke and fire conditions. Fire
alarm systems use a variety of components to meet the requirements of each installation. The fire alarm
panel, automatic and manual detection devices, alarm annunciators, and the installation wiring are all
factors in a reliable system. To maintain proper operation, fire codes require, and this manufacturer
recommends preventive maintenance and testing on a routine basis by qualified personnel.
3.0 THEORY OF OPERATION
3.1 Initiating Device Circuits (IDCs)
The supervised IDCs operate with compatible smoke detectors (refer to Appendix) and normally-open
alarm initiating devices. An IDC may be programmed as an Alarm, Waterflow/Supervisory, or Supervisory
zone. Alarm zones may have verified or non-verified operation. Waterflow/Supervisory zones programmed
with or without a 15 second retard period, also support a single supervisory input device with a
1.1K
W
series resistor. IDC circuits may take one of four operating states: Normal, Trouble, Alert, or Alarm.
Table 3.1 defines the states for the various IDC zone types.
Table 3.1 - IDC Operation
State of Operation
Zone Type Alarm
(Low Impedance)
Alert
(High Impedance)
Normal Open
Non-Verified
Alarm Zone
Alarm Alarm Normal Operation Trouble
Verified Alarm Zone
with high impedance
smoke detectors and
N.O. contact devices
Alarm Verifying the Alarm Normal Operation Trouble
Verified Alarm Zone
with smoke detectors
only
Verifying the Alarm Verifying the Alarm Normal Operation Trouble
Waterflow/Supervisory
Zone
Alarm Supervisory Condition Normal Operation Trouble
Waterflow/Supervisory
Zone with Retard
Alarm after 15 seconds Supervisory Condition Normal Operation Trouble
Supervisory Zone Supervisory Condition Supervisory Condition Normal Operation Trouble
WARNING! Do NOT put contact devices on Low Impedance Verified Circuits.
An active IDC defined as an Alarm or Waterflow Zone may be identified by a steady red zone LED. Active
IDCs defined as supervisory zones may be identified by a rapid flashing amber zone LED.