Operation: Refrigeration - Scotsman FME1504 User Manual

NME1254 & FME1504

OPERATION: Refrigeration

Beginning at the compressor, the refrigerant is
compressed into a high temperature gas. The
discharge line directs this gas to the condenser. At
the condenser (air or water cooled) the gas is
cooled by either air or water and it then condenses
into a liquid. This high pressure liquid then goes
through the liquid line to the expansion valve.
The thermostatic expansion valve meters liquid
refrigerant into the evaporator, the volume of liquid
refrigerant depending upon the temperature of the
evaporator; warmer evaporators get more
refrigerant and colder evaporators get less.
AIR COOLED
CONDENSER
REFRIGERATION SYSTEM SCHEMATIC
DISCHARGE
FAN
MOTOR
LIQUID LINE
June 2002
Page 14
At the evaporator, the refrigerant enters an area
of relatively low pressure, where it can easily
"boil off" or evaporate. As it evaporates, it
absorbs heat from the evaporator and whatever
is in contact with it (such as the water inside it).
After the evaporator, the refrigerant, now a low
pressure vapor, goes through the suction line
back to compressor, where the cycle is
repeated.
SUCTION LINE
LINE
COMPRESSOR
THERMOSTATIC
EXPANSION
VALVE
EVAPORATOR