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 TM 55-1925-273-10-1
0038 00
RECEIVER
The receiver serves as a liquid refrigerant reservoir. It receives liquid refrigerant from the condenser unit and supplies it to
the expansion valve.
CONTROL BOX
A control box, mounted on the condenser, provides controls and indicators necessary for operation of the condenser unit.
LOCAL CONTROLS AND INDICATORS
Local controls and indicators include a defrost timer for the freezer room, thermostats for the chill room and freezer room,
and temperature gauges for the chill room, freezer room, and thaw room.
REFRIGERANT SYSTEM OPERATION
The local controls and indicators on the control box communicate the desired temperatures and functions for the chill room,
freezer room, and thaw room. The local controls and indicators also indicate the current temperatures for the chill room,
freezer room, and thaw room. Liquid refrigerant is supplied to the unit cooler tubes (figure 1) by the expansion valve (figure
1), which is actuated by both pressure and temperature of the refrigerant in the system. The refrigerant then flows through
unit cooler tubes where it evaporates (figure 1). As the refrigerant evaporates, it absorbs heat from the air passing over the
unit cooler tubes. After leaving the unit coolers, the gaseous refrigerant is routed to the compressor. On the down stroke of
the compressor's (figure 1) piston, refrigerant vapor flows into the compressor (figures 1 and 2). The compressor (figure 1)
compresses this refrigerant vapor, raising its temperature and pressure. The compressor (figure 1) discharges the now high-
pressure, superheated refrigerant vapor to the condenser (figure 1), where it flows around the tubes through which raw water
is being circulated. As the refrigerant vapor transfers its heat to the raw water, the temperature of the refrigerant vapor drops
to the condensing point, turning the refrigerant vapor into liquid. The refrigerant, now in liquid form, is sub-cooled slightly
below its condensing point. The refrigerant liquid flows on to the receiver (figure 1). The receiver (figure 1) acts as a
temporary storage space and surge tank for the liquid refrigerant. The receiver also serves as a vapor seal to keep vapor out
of the liquid line to the expansion valve. The refrigerant begins its cooling cycle again.
END OF WORK PACKAGE
0038 00-5/6 blank
0038 00-5
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