Protectowire 2000 FireSystem Instrukcja Użytkownika Pobierz pdf (Strona 8)

“ambient” temperature. These ratings and

their approximate temperature of operation

are as follows:

Regular 135°F (57°C)

155°F (68°C)

Intermediate 190°F (88°C)

220°F (105°C)

High 280°F (138°C)

Extra High 356°F (180°C)

Rules for selecting the proper rating to be

installed in a given area are the same as for

automatic sprinklers and other heat actuated

devices. The factors which must be considered

are:

• What temperatures will the Detector be sub-

jected to based upon the fire intensity char-

acteristics of a particular fuel?

• What is the maximum ambient temperature

at the Detector?

Please refer to the Temperature Rating and

Model Number Chart for a detailed listing of

each Protectowire model and it’s maximum

installed ambient temperature limit.

The selection of the Detector rating should be

based upon the most rapid response to the

anticipated fire condition combined with the

ability to withstand a high, but not abnormal

ambient temperature, without causing an

unwanted alarm. For example, Regular rating

should not as a rule be put in an attic. In build-

ings such as sheds and warehouses with roofs

exposed to the sun and inadequately insulated

or ventilated, summer temperatures near the

roof may be expected to rise well above 100°F

(38°C) in many geographic areas. In an

extremely hot climate, even Intermediate may

be too sensitive for a poorly ventilated attic area

or under an uninsulated metal roof.

In the same way, allowance must be made for

normally high temperatures in boiler and

heater rooms, under glass exposures, in areas

where steam pipes or heating ducts are run,

near unit heaters and heating outlets, and in

all other locations where ceiling temperatures

above 100°F (38°C) are not indicative of fire

or other abnormal conditions.

The area in front of and within the air flow of

heating outlets and unit heaters should

always be investigated. In freezer applica-

tions, locations near refrigeration equipment

are also subject to surprisingly high tempera-

tures during defrost cycles and require addi-

tional caution in terms of detector placement.

Protectowire can sometimes be routed

around such “hot spots” within the spacing

limitations. When this is impractical, a section

of higher rated Detector can be spliced into

the run. In uncertain situations, unwanted

alarms will be avoided with little risk of delay

in case of a real alarm, by using a Detector of

the next higher rating throughout the area

where the condition exists.

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Protectowire Linear Heat Detector may be

installed at the ceiling level to protect areas

within buildings (area protection) in the same

fashion as the more familiar spot type heat

detectors.

The majority of applications for linear detec-

tors, however, involve installation of the

detector close to the hazard in order to pro-

vide a rapid response. This is known as prox-

imity or special application protection.

Information on both types of installations will

be provided.

Location

In general, Protectowire Linear Heat Detector

should be located on the ceiling of the area to

be protected, or on the sidewalls within 20

inches (500 mm) of the ceiling. It may also be

located on the underside of solid joists or

beams where the beams are less than 12 inch-

es (300 mm) in depth and less than 8 feet (2.4

m) on center.

For special application protection, the

Detector should be installed immediately

above the particular hazard in such a way that

it will be exposed to the hot gases emanating

from any fire or mounted beneath a horizontal

surface that will cause the same radial spread

of heat as the ceiling of a room does in area

protection applications.

In some applications, it is important to detect

a slow heat rise or overheat condition before

sufficient heat can be generated to cause an

equipment failure or fire ignition. A typical

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