Chapter 2 Pre-installation considerations
Normal mode
A zone is in normal mode when no fire, smoke, or sprinkler alarms are present in the building. In some zoning systems, a zone may be in normal mode if an alarm condition is present in the building but the zone is not affected. In normal mode, the smoke control system is inactive.
Alarm mode
A zone is in alarm mode when it is the origin of the first fire, smoke, or sprinkler alarm. In alarm mode, the smoke control system operates fans and dampers to protect adjacent and unaffected zones and provide a smoke exhaust route for the alarm zone.
Adjacent mode
A zone is in adjacent mode when it is next to the alarm zone. However, in some zoning systems, zones that are not next to the alarm zone may be designated as adjacent zones. Other zoning systems may designate all
Unaffected mode
A zone is in unaffected mode when it is neither the alarm zone nor an adjacent zone and an alarm is present in the building. In large buildings, there may be many zones that are not near the alarm zone. Codes do not state which zones are unaffected. In unaffected mode, the smoke control system may shut down and isolate unaffected zones. Or, the smoke control system may allow unaffected zones to operate in normal mode. Actual system operation depends on the design of the smoke control system.
Associated equipment
Equipment associated with the smoke control system design is a pre- installation consideration prior to setting up the smoke control system controls. Associated equipment includes: fire alarm system equipment, fire alarm control panel, firefighter’s smoke control station, and smoke control system equipment.
Fire alarm system equipment
The building fire alarm system is responsible for detecting an alarm condition, alerting occupants by audible and visual means, and signaling the smoke control system. Fire alarm system equipment includes: area,
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