Appendix A: Special Zone Operation Releasing Zones (R0-R9)
58 NFS-640 Operations Manual P/N 51334:B 10/03/2003
Listing of each Cross Zone option and the conditions required to activate the Releasing Zone, according
to the example shown in Figure 43.
Table 15 Example of Cross Zone Selections
Cross Zone
Selection (Cross=)
Condition(s) Required to Activate the Releasing zone
Cross=N An alarm from any detector activates the releasing circuit.
Cross=Y An alarm from any two detectors activates the releasing circuit.
Cross=Z An alarm from two detectors mapped to different Software Zones,
but mapped to the same Releasing Zone.
• An alarm from 2D101 and 2D103 – detectors mapped to different
zones, but both list ZR1 in their CBE.
• An alarm from 2D102 and 2D104 – detectors mapped to different
zones, but both list ZR1 in their CBE.
• An alarm from 2D101 and 2D104 – detectors mapped to different
zones, but both list ZR1 in their CBE.
• An alarm from 2D102 and 2D103 – detectors mapped to different
zones, but both list ZR1 in their CBE.
Cross=H Activation of heat detector 2D104 and one smoke detector (2D101,
2D102, or 2D103).
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