SilentKnight SK-5208 Conventional FACP 10-30 Zone - Manual (Page 69)

Operation 151204
5-4
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
Table 5-3: Cross Alarm Operation
Inputs Output Results
Cross Zone 1 X X X X
Cross Zone 2 X X X X
Pull Station X X X X
Normal Pre-Alert Pre-Alert Releas
e and
Ge
nera
l Al
arm
Releas
e and
Ge
nera
l Al
arm
Releas
e and
Ge
nera
l Al
arm
Releas
e and
Ge
nera
l Al
arm
Releas
e and
Ge
nera
l Al
arm