Protectowire 2000 FireSystem Manual de usuario descargar pdf (Pagina 24)

21

Refrigerated Storage Areas

When Protectowire Linear Heat Detector is

used in refrigerated storage or warehouse

applications as the initiating device for pre-

action sprinkler systems, Factory Mutual loca-

tion and spacing guidelines are generally rec-

ommended.

Figure 26 shows the FM acceptance criteria

for open area ceiling applications which

requires that the Detector be installed at a

spacing not exceeding the allowable ceiling

sprinkler spacing.

Rack detection systems should be installed

based upon the following criteria: For single

row and double row racks, one line of detec-

tion cable is needed at each in-rack sprinkler

level. Locate the Protectowire detection cable

in the longitudinal flue space and attach it to

the horizontal load beam at the sprinkler line

level as illustrated in Figures 26A and 26B.

For multiple-row racks, a line of detection

cable is needed for each in-rack sprinkler

line at each in-rack sprinkler level. Locate the

detection cable in each longitudinal flue

space and attach to the horizontal load

beams at the sprinkler branch line levels.

Installation Advisory - When Protectowire is

installed in refrigerated warehouses and

freezer applications, prior to chill-down, it is

important to provide adequate slack or “sag”

in the wire during the installation process in

order to avoid excessive stress on splicing

connections which may result in open circuit

trouble conditions. This built-in slack is

intended to compensate for the contraction

of the Detector core which occurs during the

reduction in temperature as the facility is

brought down to it’s subfreezing operating

temperature.

Figure 26B

Figure 26

Figure 26A

Figure 25B

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