ADEMCO VISTA-100 Service Manual download pdf (Page 6)

Expansion: The type of hard wired and RF (wireless) zone expansion. VISTA-20P, VISTA-20PS use 4219 or 4229

modules for zone expansion. The VISTA-128BP, VISTA-128FBP, VISTA-250BP and VISTA-250FBP use multiplexing (aka:

polling loop or V-Plex). All wireless expansion is 5800 series.

Fire Alarm Control Unit (Panel): A system component that receives inputs from automatic and manual fire alarm

devices and may supply power to detection devices and transponder(s) or off premises transmitter(s). The control unit may

also provide transfer of power to the notification appliances and transfer of condition to relays or devices connected to the

control unit. The fire alarm control unit can be a local fire alarm control unit or master control unit.

General Alarm: When a general alarm pull station is activated it will immediately sound the notification appliances

throughout the building. This is the most common type of pull station.

Hardwired short detection: The VISTA-15 can be programmed to detect a short circuit on any hardwired zone which

will result in a trouble condition if the system is disarmed. If the system is armed, an alarm will be generated.

Heat Detectors: Heat detectors respond to the thermal energy (heat) signature from a fire and they are generally located

on or near the ceiling. They respond when the detecting element reaches either a predetermined fixed temperature or when

a specified rate of temperature rise occurs.

Fixed-Temperature Heat Detectors: These detectors initiate an alarm when the detecting element reaches a

predetermined fixed temperature. One draw back of this type of heat detector is that when the detector activates, the

temperature of the air surrounding the detector has exceeded the predetermined temperature set point. Therefore

there is a lag in time between the time the temperature reaches the predetermined point and when the detector

activates. This is called thermal lag.

Non-restorable Fixed Temperature Detectors: This type of heat detector uses a fusible element made from a

eutectic metal alloy such as lead or tin that melts rapidly at a predetermined temperature (commonly 135 degrees F).

The operation of the detector destroys either the entire unit (or at least the operating element) that the system

maintainer must replace.

Restorable Fixed Temperature Detectors: This type of fixed temperature heat detector uses a bimetallic

element. The bimetallic element has two metal strips bonded together with different coefficients of thermal expansion.

When the bimetallic element is heated it will create a bending action. This bending action will close a normally open

contact thereby initiating an alarm. After operating, the bimetallic type automatically restores when the temperature

falls to a point below the set point of the detector.

Rate-of-Rise Detector: A rate-of-rise detector will operate when the rate of temperature increase from a fire

exceeds a predetermined level, typically around 5 degrees F in twenty seconds or 15 degrees F per minute. Small,

normal changes in ambient temperature that can be expected under non-fire conditions will not operate the detector.

These heat detectors are restorable and are typically combined with the fixed temperature heat detector.

Combination Detector: These detectors can contain more than one sensing element to respond to a fire.

Examples include a combination fixed-temperature/rate-of-rise heat detector, or a combination of a smoke detector

and a heat detector. Fixed temperature/rate-of-rise heat detectors are the most common combination heat detector.

The advantage of a fixed temperature/rate-of-rise detector is that the rate-of-rise element is more responsive to a

rapidly developing fire while the fixed temperature element responds to a fire that develops slowly.

Rate-of-Rise-Compensated Fixed Temperature Detector: In a slowly developing fire, this form of detector

responds when the temperature of the air surrounding the detector reaches a predetermined level. In a rapidly

developing fire, the detector anticipates the air temperature reaching the operating point accelerating the operation of

the detector. This produces a fixed temperature detector with virtually no thermal lag. Rate compensated heat

detectors are considerable more expensive than fixed temperature or rate-of-rise/fixed temperature detectors.

Horns: Horns are used for applications that require louder or more distinctive signals, or both. Horns may require more

operating power than bells; therefore, care should be taken to see that circuits are electrically compatible when powering horns.

They may be of the surface (grille), flush, semi-flush, single projector, double projector, or trumpet type. In very noisy areas such

as a factory, resonating, air-powered or motor-driven horns are sometimes used because of their inherently high decibel output.

Glossary of Terms

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ADEMCO VISTA-100 Service Manual Page 6

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