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 TM 55-1905-223-10
absorbs heat given off by the system refrigerant and is routed via the water outlet to the seawater discharge
line. The unit is connected with flanged ducting to duct' heater DH-2. A removable filter is installed on the
starboard side of the unit. A condensate drain is routed out of the unit separately from the seawater discharge.
(3) Engine room operating station air conditioner AC-3 C-3 is identical to the AC-2, except that
. A
a plenum has been added on top of the unit for directing cooling air in three directions.
1-12. Gyro Compass System The gyro compass provides heading information to steering repeaters in the
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pilot house and steering gear room. The heading information is used for navigating the LCU. Heading data is
also sent to bearing repeaters on the port and starboard bridge wings and the pilothouse top; to the radar
direction finder, omega navigational receiver, X-band and S-band radar units; and to the autopilot. The gyro
compass is provided with a viewing window and compass card (dial) for viewing ship's heading. The gyro
control and power assembly provides for control and monitoring of the gyro compass and the routing of heading
data. The outputs of the gyro compass, with the gyro control and power assembly repeater switch on, are
applied to a switch unit. The switch unit provides heading data and lamp voltage to the steering repeaters and
a MK 37 Mod E relay transmitter. The switch unit drives the step repeaters from heading data.
a.
MK 37 Mod E Relay Transmitter The relay transmitter receives heading data and lamp voltage
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from the switch unit, amplifies the data, and transmits the data and lamp voltage to bearing repeaters, and to
other equipment. Each output on the relay transmitter is controlled by a toggle switch.
b.
Compass Repeater. The compass repeaters, steering and bearing, provide remote ship's heading
s
as determined by the gyro compass. A dc step motor responds to data signals transmitted from the gyro
compass switch unit and relay transmitter. The dc step motor is geared to a compass card which is driven to a
point corresponding with the gyro compass heading. The repeaters contain synchronization knobs for aligning
the repeater card with the gyro compass. Steering repeaters are mounted on bulkhead mounting brackets
which contain a rheostat for varying repeater lamp current and a toggle switch for controlling power to the
repeater. Bearing repeaters are mounted on column bearing pelorus stands that contain a rheostat for varying
lamp current. Power to the bearing repeaters is controlled by toggle switches in the relay transmitter. Toggle
switches in the relay transmitter also control data information to other equipment.
c.
Power. The ac power is applied to the gyro control and power assembly through the power
converter. The power converter also converts ac to dc and applies dc to the power transfer unit. Upon loss of
ship's service power, the power transfer unit applies ship's emergency switchboard battery power to the gyro
control and power assembly.
1-13. Control and Monitoring System The control and monitoring system provides for the centralization of
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control and monitoring functions for the main propulsion power train, selected pumps, ship's service diesel
generators, and vital alarms. Pilothouse and engine room propulsion control is possible without intervention of
engine room personnel. Primary control is from the pilothouse console with one soldier at the engine room
console. The system permits constant automatic
1-90
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