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 TM 55-1925-273-10-1
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
THEORY OF OPERATION
REFRIGERATION SYSTEM
The Large Tug (LT) refrigeration system provides cooling for the chill box, walk-in freezer, and thaw room (refer to
figures 1 and 2). Major components of the refrigeration system include: two condensing units (figure 2) two unit coolers
(figure 2), an expansion valve (figure 2), compressor (figure 2), condenser (figure 2), receiver (figure 2), local controls and
indicators, and control box (figure 2).
EXPANSION VALVE
UNIT COOLER COIL TUBES
HIGH SIDE
LOW SIDE
LEGEND
RECEIVER
VAPOR REFRIGERANT
LIQUID REFRIGERANT
COOLING WATER
Figure 1. Typical Refrigeration Cycle
0038 00-1
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