The Firecycle® II system is a single interlocked pre-action system that has the ability to cycle on and off until the fire is potentially out. Firecycle® II is an FM approved system, but is no longer offered by The Viking Corporation. The system is being phased out due to integral components of the system, namely the mother board of the release control panel, no longer being manufactured. An upgrade option for Firecycle® II to Firecycle® III Multi-Cycle single interlocked pre-action system is available. The cycling function for Firecycle® III Multi-Cycle is the same as for Firecycle® II but utilizes recent technology and does not require the large power supply of Firecycle® II.