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 TM 55-1905-223-24-18-1
120 Vac power to the emergency switchboard battery charger, which charges the
emergency switchboard 24 Vdc batteries, providing voltage to the 24 Vdc distribution
panel. This panel provides 24 Vdc power to those systems required to maintain
propulsion control, and communication. When tied to shore power through the shore
power box, power distribution is the same as provided for primary power. Refer to
FO-1 for electrical power distribution.
1-22. Fresh Water Piping System. The fresh water piping system provides cold and
hot potable water throughout the LCU. System control is maintained through a
combination of valves as shown in FIGURE 1-9. The system consists of two reverse
osmosis watermakers, two fresh water (FW) pumps and pressure switches, a pressure
tank, hot water heater, and fresh water tank level indicator transmitters. Also
included is a hot water booster pump and hot water booster heater for the Gaylord
Hood. The FW tanks are filled and vented through fill and vent connections on the
main weather deck. Each FW tank has a drain to the bilge. In addition to the
potable water system, cold fresh water (CFW) is supplied to the fresh water cooling
piping system.
a. FW Pumps No. 1 and No. 2. Two FW pumps draw CFW from the port and starboard
FW tanks and route the CFW under pressure to the hydropneumatic pressure tank, which
maintains CFW pressure throughout the system. Power for the pumps is supplied from
the main switchboard 240 Vac distribution, and controlled by start and stop
pushbuttons on the engine room console and by pressure switches. One pump (main) is
on line and the other (standby) is in reserve.
b. Pressure Switches. Each FW pump pressure switch automatically turns on its
respective FW pump when pressure drops below to the cut-in setpoint (pump 1-35 psi,
pump 2-30 psi). Each FW pump pressure switch automatically turns off its respective
FW pump when pressure exceeds 60 psi.
c. Pressure Tank. The hydropneumatic pressure tank maintains CFW supply
pressure for the system. Pressurized CFW is supplied from the pressure tank to
various points throughout the ship and to the hot water heater.
d. Hot Water Heater . The hot water heater heats the CFW supply and maintains
its setpoint temperature. Power for the hot water heat is supplied from the main
switchboard 240 Vac distribution panel and controlled by a disconnect switch
adjacent to the heater. Hot fresh water (HFW) from the heater is supplied to the
booster pump.
e. Booster Pump .
The booster pump maintains HFW pressure required for the
Gaylord Hood system.
f. Booster Heaters. Two booster heaters provide an increase in HFW temperature
for use in the galley (dishwasher and hood). Both booster heaters are supplied with
power from the GALLEY POWER PANEL P202.
g. Tank Level Indicator Transmitters . Bach FW tank contains a tank level
indicator transmitter which sends a tank level signal to the gauge board in the
engine room which indicates each FW tank level.
1-20
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