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SEQUENCE OF OPERATION (SOO) HI-FOG WATER MIST SYSTEM – DATA CENTER PART A – WATER MIST PRE-ACTION SYSTEM IT Rooms / Electrical Rooms / Sensitive Areas ****Confirmed Fire Definition (as per NFPA 750 Section 5.6 / VdS Section 6):**** Activation of two (2) independent detectors within the same protected zone (Cross-Zoned Detection). Pre-Action "Step-by-Step Sequence of Operation" Step Input / Event System Logic System Response 1 System Normal No detector active System in standby, pumps stopped, valves closed 2 First detector activated Pre-alarm condition Fire alarm at FACP, no discharge, no pump start 3 Second detector activated Confirmed fire achieved Confirmed fire alarm generated 4 Confirmed fire Start pre-discharge sequence Audible & visual warning activated, time delay initiated 5 Discharge delay elapsed Fire condition maintained Pre-action valve opens 6 Valve open feedback received Fire-driven logic satisfied Water mist pump starts 7 Pump running Valve open Water mist discharge commences 8 Post-discharge condition System operated System remains in lockout 9 Manual reset Authorized reset System restored to normal standby Interfaces and Alarms (Pre-Action) Fire Alarm System receives: o Pre-alarm o Confirmed fire o Valve open status o Pump running / fault HVAC interfaces: o Shutdown upon confirmed fire BMS monitoring only (no control)
PART B – WATER MIST DELUGE SYSTEM Battery Rooms / High Fire Growth Areas Confirmed Fire Definition: Activation of two (2) independent detectors within the same protected battery room. Deluge "Step-by-Step Sequence of Operation" Step Input / Event System Logic System Response 1 System Normal No detector active System in standby 2 First detector activated Alarm condition Fire alarm at FACP, no discharge 3 Second detector activated Confirmed fire Confirmed fire alarm generated 4 Confirmed fire Immediate action Deluge valve opens 5 Valve open feedback Fire-driven logic satisfied Water mist pump starts 6 Pump running Valve open Continuous water mist discharge 7 Post-discharge Fire suppressed System lockout 8 Manual reset after inspection Authorized action System restored to standby Interfaces and Alarms (Deluge) Fire Alarm System receives: o Alarm o Confirmed fire o Valve open status o Pump running / fault HVAC systems shutdown upon confirmed fire