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 TM 55-1925-273-10-1
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
THEORY OF OPERATION
ALARM SYSTEMS
GENERAL
The LT is equipped with four alarm systems. The fire alarm system alerts the crew when a fire is detected via sensors located
throughout the LT. The general alarm system is used to alert the crew to a general alarm condition. The door alarm system
consists of alarms located in various locations throughout the LT to alert the crew of entry into certain spaces within the LT,
or not to enter when high temperature has been detected, or when a sprinkler system has been activated. The FM-200 fire
suppression system gives the crew a 60-second warning prior to discharge of the FM-200 system.
FIRE ALARM SYSTEM
GENERAL
The fire alarm system alerts the crew to the presence of a fire by sounding an alarm via sensors located throughout the LT or
when it has been manually activated through a fire alarm pull station. See figure 1 for a schematic diagram of the fire alarm
system.
The fire alarm system consists of the fire and smoke detection panel located in the EOS; a remote indicating panel located in
the pilothouse; a terminal box, heat rise detectors (thermostats), infrared detectors, and smoke detectors located in various
compartments; fire alarm pull stations; and a 10 inch (254 mm) bell. The heat detectors are arranged in various zones
throughout the vessel. When a fire condition is detected, the associated sensor sends an alarm signal via a zone module
located in the fire and smoke detection panel to the applicable fire control panel indicators. When pulled, the fire alarm pull
station also sends an alarm signal via the zone module to the applicable fire detector panel indicators.
FIRE AND SMOKE DETECTION PANEL
The fire and smoke detection panel is located in the EOS and alerts the crew to any fire detector faults in the fire detection
system as well as alarm indications via LED indicators. See figure 2 for a depiction of the fire and smoke detection panel.
The panel contains indicator lights that illuminate when a fire is detected within the applicable zone area. The POWER
FLASHING indicator illuminates to indicate that power is being supplied to the fire and smoke detection panel. The WHEN
ON BATTERY indicator will flash when the fire and smoke detection panel is on battery power. The ALARM FLASHING
WHEN SILENCED indicator illuminates when an alarm for one or more zones has been detected and will flash after the
audible alarm has been silenced. The DC VOLTS meter indicates the dc voltage of the fire and smoke detection system while
the DC AMPS meter indicates the fire and smoke detection system dc amperage. BATTERY TROUBLE indicator will be
illuminated when the system detects a low charge in the battery system.
REMOTE INDICATING PANEL
The remote indicating panel is located in the pilothouse and alerts the pilothouse crew to the presence of fire. The panel
contains four indicators that will illuminate the appropriate zone indicator for which the fire or smoke is detected.
HEAT RISE DETECTORS
There are three thermal heat detectors that are mounted in the 01 level passageway and in the boatswain's store and passage-
way. The heat detectors send a signal to the remote indicating panel when fire is detected, triggering the appropriate alarm.
SMOKE DETECTORS
There are 15 smoke detectors located in various locations throughout the LT. The smoke detectors contain a set of normally
open contacts that close when smoke is detected. When the contacts are closed, a signal is sent to the remote indicating panel
that will sound the appropriate alarm.
0036 00-1
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