Potter Releasing Systems - Manual (Page 58)

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Deluge Systems
The purpose of a deluge system is to deliver water immediately to the protected area. It wets down an entire
area by dispensing water through sprinklers or spray nozzles that are normally open. Since the operation of a
deluge system does not rely on the opening of sprinkler heads, they are suitable for extra hazard occupancies in
which flammable liquids are handled or stored.
The water for a deluge system is held back by an electrically operated valve. The valve is connected to a
compatible release panel. The panel is monitoring initiating devices such as smoke or heat detectors, and pull
stations. When the panel detects an alarm condition, the release circuit is energized. This allows the valve to
open and water to flow into the system piping and out of the normally open sprinklers or spray nozzles.
In order to prevent an accidental discharge of water, deluge systems are sometimes crosszoned. This requires two
initiating zones with one device in each zone to be in alarm before the panel will energize the release circuit. A
manual station zone will override the cross zoning feature and cause the release circuit to be energized immediately.
Typical Configuration
Initiating (inputs)
Zone #1 - Conventional Alarm Zone - Smoke or Heat detectors
Zone #2 - Conventional Alarm Zone - Smoke or Heat detectors
Zone #3 - Waterflow Zone - Pressure type waterflow switch
Zone #4 - Manual Station Zone - Pull Stations
Sup #1 - Supervisory Zone - Valve tamper
Sup #2 - Supervisory Zone - Valve tamper
Note: If the panel is programmed for cross zone operation, both zones 1 and 2 would have to be in alarm before
the release circuit would become energized. The manual station zone would override the cross zoning feature.
Indicating (outputs)
#1 - Alarm - General alarm. Bell, horn, strobe, etc.
#2 - Alarm - Waterflow bell
#3 - Release - Solenoid on valve
#4 - Supervisory - Bell or horn to indicate supervisory condition