ADEMCO VISTA-100 Service Manual download pdf (Page 10)

Sprinkler System Control Valve Supervision: The main reason for sprinkler system failure is do to

inadvertent control valve closure. A closed control valve will shut off the water supply to the sprinkler heads.

Sprinkler system control valves are used to shut off the water supply to all or a portion of the piping system so that

maintenance, service or alterations can be performed. Therefore, the monitoring of the control valve position is

essential and is accomplished by connecting supervisory switches to the control valves.

When a control valve is closed it will activate the supervisory switch and send a supervisory signal to the fire alarm

control panel. When the control valve is opened it will restore the supervisory switch and the fire alarm control

panel to their normal condition.

Strobes: Stroboscopic lights (commonly called “strobes”) operate on the energy discharge theory to produce a high

intensity flash of short duration. The short bright flash is not only attention getting, but is effective when general visibility is

low. Strobe appliances come in a wide range of light intensities that are measured in candelas (cd). Typical strobe candela

ratings are 15cd, 30cd, 15/75cd and 75cd. Repetition rates are usually between one and five flashes per second.

Supervisory Signal: A signal indicating the change in status in connection with the fire suppression system or

equipment, or with the maintenance features of related systems. For example, a supervisory signal could indicate that a

sprinkler system supply value is closed.

Telephone Line Fault Monitor: The system constantly monitors the phone line for proper voltage. Upon a phone line

failure, the panel can be programmed to either display this condition at the keypads, display and sound a trouble at the

keypads, or display, sound, and cause an output to activate (strobe light, siren, backup transmission device, etc).

Telephone Module: Allows a local or remote touch-tone telephone to act as a keypad. This feature is accomplished by

adding 4285 or 4286 module. The FA4286 module has the additional capabilities of supporting up to 2 4500 thermostats

and external speakers.

Trouble Signal: A signal initiated by the fire alarm system, indicative of a fault in a monitored circuit or component. For

example, a trouble signal could indicate a break in the circuit wiring or a detector that is not operating properly.

Two-Way Fire Department Communications System: An electrically monitored telephone system providing private

voice communications capability between the fire command center or central fire control unit and designated remote

locations. Phones or phone jacks can be installed at the remote locations. Usually this type of system is installed in high-

rise buildings, such office buildings or condominiums, over seven stories in height.

Visible Signal: A visible signal is the response to the operation of an initiating device by one or more direct or indirect

visible notification appliances. For a direct visible signal, the sole means of notification is by direct viewing of the light source.

Voice Evacuation Panel: A critical function of a fire alarm system is notifying the building’s occupants that there is a fire

within the building thereby allowing them to safely exit the building. Typically, when a fire alarm system is activated it will

sound conventional notification appliances such as horns, bells or chimes.

However, the occupants of a building may not be familiar with the evacuation routes in public assembly occupancies or high

rise buildings and will be unable to safely exit the building. Therefore, voice evacuation panels are required to automatically

transmit pre-recorded or live voice evacuation instructions over speakers in public assembly occupancies such as places of

worship, restaurants, gymnasiums, theaters and auditoriums.

V-Plex: AKA the polling loop or multiplexing. It is a method of zone expansion that provides power and data on the same

pair of wires. See Expansion.

Zone: A defined area within the protected premises. A zone may define an area from which a signal can be received, an

area to which a signal can be sent, or an area in which a form of control can be executed.

Glossary of Terms

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ADEMCO VISTA-100 Service Manual Page 10