Edwards Signaling 2400 Series - Manual (Page 14)

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When an IDC is programmed as a waterflow zone, the IACs DO NOT respond to the ALARM SILENCE
switch or automatic alarm silence until the waterflow device is no longer active. Both an alarm initiating
device and a supervisory contact may co-exist on the same circuit by putting a 1.1K
Ω in series with the
supervisory contact. When the waterflow with retard option is programmed, a special algorithm samples
the circuit repeatedly. If 66% of the samples taken in any 15 second period indicate a waterflow (shorted)
condition, the circuit activates a waterflow alarm.
When an IDC is programmed as a verified zone and a smoke alarm is detected, the panel enters the
Alarm Verification state. A twenty five second sequence in which the detector is reset, delayed, and
restarted is initiated, as shown in Figure 3.1. If auxiliary power is programmed as resettable, it is de-
energized for the reset period. Following the reset-delay-restart sequence, a 60 second verification
window is opened. If the verifying zone should go into the Alert, Alarm, or Trouble conditions within the 60
second window as shown in Figure 3.2, the panel enters the alarm mode. If any other IDC on the panel
goes into the alert or alarm state during the verification period, the panel immediately enters the alarm
mode. Dry contact alarm initiating devices may be combined with High Impedance 2-wire smoke detectors
on verified zones. The closing of a normally open dry contact alarm initiating device generates an Alarm
state immediately, and the panel enters the alarm mode.
Initiating Device Circuit, Class A (Style D) Operation
To convert a Class B (Style B) IDC zone to a Class A (Style D) IDC zone, install a 2400-BPA Class A
(Style D/Z) Converter on the base panel, or a 2400-IDCA Class A (Style D) Converter on the Two Zone
IDC Module. The converters provides an alternate path to the zone module for all Initiating Devices in the
event of a single wire break in an IDC.
NOTE
2- Wire Relay Bases are NOT supported on Initiating Device Circuits (IDCs).