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DIFFERENCES BETWEEN MODELS
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TM-55-1925-292-14-P Firefighting Fire Alarm and Fire Suppression Systems Inland and Coastal Large TUG (LT) Manual
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Table 6. Bell Technical Characteristics
TM 55-1925-292-14&P
0002 00
IONIZATION SMOKE DETECTORS
The smoke detectors are part of the fire alarm system. There are 15 24-volt ionization smoke detectors in
various locations throughout the vessel. The ionization smoke detector's contacts close when smoke is de-
tected. When the contacts are closed, the fire and smoke detection panel in the EOS detects the condition and
sounds the alarm.
The technical characteristics of the smoke detectors are contained in table 3.
Table 3. Smoke Detectors Technical Characteristics
Item
Data
Manufacturer .............................................................................................................. Pyrotronics
Model ..................................................................................................................................... DI-3
Series ................................................................................................................................... 6119
Type ..................................................................................... Adjustable Sensitivity/Dual Chamber
Operating Temperature .................................................................... 32 F (0 C) 100 F (38 C)
Voltage ............................................................................................................................... 24 Vdc
Amps ..................................................................................................................................... 80 A
THERMAL HEAT DETECTORS
There are three thermal heat detectors in the fire alarm system. One each is located in the EDG room, the galley,
and the crew's mess/recreation area. The thermal heat detectors are similar to the ionization smoke detectors
except the contacts close when a temperature of 135 F (55.2 C) is sensed.
The technical characteristics of the thermal heat detectors are contained in table 4.
Table 4. Thermal Heat Detectors Technical Characteristics
Item
Data
Manufacturer .............................................................................................................. Pyrotronics
Model .......................................................................................................................... DT-135WP
Type ........................................................................................................................ Weatherproof
Temperature Set Point ........................................................................................ 135 F (57.2 C)
Voltage ............................................................................................................................... 24 Vdc
Amps ....................................................................................................................................... 1 A
BEACON
The fire alarm system beacon (red) is located in the radio room. The beacon provides a visual indication of a fire
alarm condition.
The technical characteristics of the beacon are contained in table 5.
Table 5. Beacon Technical Characteristics
Item
Data
Manufacturer ................................................................................................ Revere Plastics, Inc.
Type ................................................................................................................... Beacon, Rotating
Voltage .............................................................................................................................. 115 Vac
24 Vdc
0002 00-23

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