Simplex 4100U Application Manual page 94

Glossary of Terms,
Glossary
Continued
Control Unit – A device with the control circuits necessary to (a) furnish power to a fire alarm
system; (b) receive signals from alarm initiating devices and transmit them to audible alarm
notification appliances and accessory equipment; and (c) electrically supervise the system
installation wiring and primary (main) power. The control unit can be contained in one or more
cabinets in adjacent or remote locations.
Dedicated Smoke Control Components – Solely used for smoke control functions and are not
operated in a non-emergency condition. Dedicated system equipment is therefore required to
incorporate an automatic weekly self-test or each smoke control function.
Dedicated Smoke Control System – Installed in a building for the sole purpose of controlling
smoke.
Delinquency Signals – A signal indicating the need of action in connection with the supervision
of guards or system attendants.
Duct System – Use bypass dampers and ducts to control the amount of air flowing from the fan to
the outlets. The bypass dampers are opened when the stairtower is at the proper pressure, so that
excess air flows not into the duct system, but into the bypass duct and back to the air inlet.
Emergency Voice/Alarm Communication Systems – A system that provides dedicated manual
or automatic, or both, facilities for originating and distributing voice instructions, as well as alert
and evacuating signals pertaining to a fire emergency to the occupants of a building.
EOL Device – End of Line Device. A device used to terminate a supervised circuit.
EOLR – End of Line Resistor.
EP Damper Control – Electrical to Pressure Damper Control. This type of damper control may
not be commonly used due to lack of full damper position sensing.
FACP – Fire Alarm Control Panel.
Fault – An open, ground, or short condition on any line(s) extending from a control unit, which
could prevent normal operation.
FDM – Frequency Division Multiplexing. A signaling method characterized by the simultaneous
transmission of more than one signal in a communication channel. Signals from one or multiple
terminal locations are distinguished from one another by virtue of each signal being assigned to a
separate frequency or combination of frequencies.
Fire Dampers – Dampers that block a fire from penetrating a fire rated partition via a duct.
These dampers are normally-open, held in place by a fusible link. The specifications for fire
dampers appear in UL Standard 555, Standard for Fire Dampers.
Fire Suppression System – Limits the growth rate of a fire, but does not eliminate or limit smoke.
Fire-Rated Ceiling – A ceiling made of fire-resistant materials.
Fire-Rated Partition – A fire partition is a wall that is built of fire resistant materials and that
reaches from floor to ceiling.
Flame Detector – A device that detects infrared, or ultraviolet, or visible radiation produced by a
fire.
FSCS – Firefighter's Smoke Control Station. A graphic annunciating control panel that gives
firefighters information about the state of the smoke control system as well as manual control over
all of its components.
Ground Fault Detector – Detects the presence of a ground condition on system wiring.
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