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5.5
Releasing Operation
This system can perform two types of releasing operation, cross alarm releasing, and double
interlock releasing operations. Install in accordance with NFPA 72 paragraphs 3-8.3.2.3.3 and
3-8.3.2.3.3.2.
5.5.1
Cross Alarm Operation
The fire alarm control panel has two cross alert groups to select from, Cross Alert A and Cross
Alert B that accommodate releasing water systems.
When two or more zones are programmed to one of these groups then a single activation of
one zone in the group will cause a cross alert condition at the local annunciator and the pre-
alert signal output for that group. (Note: the local annunciator and the pre-alert signal will
continue to sound until it is silenced or until another cross alarm zone within the same group
activates.) If a second zone in the same group activates then both will become active alarm
zones.
If the second zone is not in the same group as the first zone then the cross alert zone will
remain in the cross alert condition and the system will signal the second by how it is
programmed.
The fire alarm control panel has four NAC and relay options that allow NACs and relays to be
selected to indicate the cross alert condition and assign release circuits for each group.
5.5.1.1 Default NAC Settings for Releasing
When "Cross Alert A" is selected in "Zone Options" the NACs are defaulted to the following
settings:
NAC 1
Releasing Circuit
NAC 3
Pre-Alert Signal Circuit
NAC 4
General Alarm Circuit
When "Cross Alert B" is selected in "Zone Options" the NACs are defaulted to the following
settings:
NAC 2
Releasing Circuit
NAC 3
Pre-Alert Signal Circuit
NAC 4
General Alarm Circuit
Inputs
Cross Zone 1
Cross Zone 2
Pull Station
P/N 151204
Table 5-3: Cross Alarm Operation
Output Results
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Operation
5-5
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