Protectowire 2000 FireSystem Manuel d'utilisateur télécharger pdf (Page 7)

4

Operation and Maintenance Manual provided

with each system control panel for specific

product information and limitations.

When Protectowire is utilized on other manu-

facturer’s control panels, several important

factors must be considered:

• Protectowire operates like a normally open

contact device which closes (shorts) upon

activation. Therefore, it must be utilized

only on initiating circuits which can detect

and annunciate a contact closure (short) as

an alarm condition.

• Protectowire is a resistive contact device,

unlike traditional spot heat detectors which

add little appreciable resistance to a detec-

tion circuit. The Detector’s comparatively

high resistance of 1 ohm for every 5 feet

(1.5m) of twisted pair, make it necessary to

evaluate each manufacturer’s control panel

and limit the Detector’s length to ensure

that each initiating circuit’s specified resis-

tance limitation is not exceeded. For most

manufacturer’s panels, the length of

Protectowire which may be used on each cir-

cuit will be relatively short since the typical

detection circuit is designed primarily to

operate early warning smoke detectors.

• Applications in which long lengths of

Protectowire are used on other manufactur-

er’s control panels, can lead to situations

where the control panel would indicate a

constant “trouble” condition due to the

excessively high circuit resistance, or create

a situation whereby the initiating circuit

would not be capable of latching into alarm.

Caution must be taken when using

Protectowire on other manufacturer’s con-

trol panels to minimize the risk of compati-

bility problems.

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The Detector is made in different temperature

ratings to allow for differences in normal or

SR-502 SERIES

Figure 1

C

ONDUIT

F

ROM

CONTROL

PANEL

C

ONDUIT

T

O

CONTROL

PANEL

P

ROTECTOWIRE LHD

F

IELD LOOP OUT

STRAIN RELIEF CONNECTOR

C

OPPER CONDUCTORS

WATERTIGHT - OILTIGHT

D

ETECTOR

LINEAR HEAT

PROTECTOWIRE

MOISTURE PROOF

E

NCLOSURE

PROTECTOWIRE LHD

FIELD LOOP RETURN

OUT (+)

OUT (-)

R

ETURN (-)

RETURN (+)

S

R-502 SERIES

Figure 1B

SR-502 SERIES

Figure 1A

1 2 3 4 5 6 7 8 9 10 11 12 ... 32 33

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