Installation and Operation Manual
60
Supervisory Device. A device that monitors the condition of a sprinkler system, such as a gate-valve switch, a
water-level switch, a low-pressure switch, a low temperature switch, or a fire-pump monitor.
Trouble Signal. An audible signal indicating trouble of any nature, such as a circuit break or a ground, occurring
in the device or in the wiring associated with a fire alarm signal.
Waterflow Switch. An assembly approved for service and built accordingly. The assembly is installed in a way
that any flow of water from a sprinkler system equal to or greater than that from a single automatic sprinkler
head will activate the switch and subsequent indication of an alarm condition.
XNU (External Network Unit). A unit that provides interface circuit to communicate with other networked panel
and/or annunciator.
Zone. A designated area of a building, commonly identified as a zone, is interchanged with an initiating device
circuit.
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