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 TM 55-1905-223-10
switchboard through the bus tie. Upon loss of ship's service power from the main switchboard, automatic bus
transfer equipment within the emergency switchboard isolates the emergency switchboard and provides for
automatic or manual starting of the emergency generator. Power monitoring of the' emergency generator is
provided by a voltmeter, ammeter, watt meter, and frequency meter. A voltage adjustment control for the
emergency generator output is also provided. A main switchboard bus tie circuit breaker and bus tie bypass
switch permit distribution of emergency power (240 Vac) to the main switchboard. The emergency generator
circuit breaker is prevented from being closed by an interlock system when primary power is being provided
through the bus tie. Power distribution is accomplished through circuit breakers on the switchboard 240 Vac,
120 Vac, and 24 Vdc distribution panels. A step-down transformer provides 120 Vac back to the switchboard,
and a 24 Vdc battery charger and switchboard batteries provide 24 Vdc back to the switchboard for distribution.
e.
Emergency Diesel Generator Engine The emergency diesel generator set engine powers the
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emergency generator. The engine is completely independent, and has its own lubrication oil and cooling
systems. The engine is electrically started. Switchboard automatic bus transfer equipment automatically starts
the engine upon failure of the ship's service systems.
f.
Emergency Generato.r The emergency generator provides power to the emergency switchboard
within 45 seconds of a ship's service power systems failure. One 40 kW generator provides emergency power.
g.
Shore Power Box The shore power box is located on the 01 level, aft exterior bulkhead. The two-
.
connection shore power box provides a cable connection for shore power and another cable connection for
providing shore power to another vessel in tandem.
1-11. Environmental Control System This system provides the LCU living compartments and specified work
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spaces with air conditioning and heating. Other work spaces and storage spaces are provided with forced air
ventilation and heating and natural supply and exhaust ventilation.
a.
Pilothouse Deck (02 Level).The pilothouse deck contains the following heating, ventilation, and air
conditioning (HVAC) equipment (FIGURE 1-32, Sheet 1):
(1) Engine room exhaust fan EF-1 (1).An axial fan with electric motor direct drive that provides
forced air ventilation for the engine room port side by drawing up through the stack.
(2) Galley exhaust fan EF-6 (2).A centrifugal fan with electric motor V-belt drive that provides
forced air ventilation for the galley. Air is drawn up from the galley hood.
(3) Pilothouse duct heater DH-2 (3).A duct mounted, flanged type, electric heater that provides
heat for the pilothouse. The thermostat for the pilothouse duct heater is located on the overhead in the
stairway.
(4) Pilothouse air conditioning unit AC-2 (4)A self-contained, 3-ton capacity air conditioner that
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provides air conditioning to the pilothouse.
1-77
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