Scotsman FME2400 Service Manual page 15

OPERATION: Refrigeration
The following description applies to each of the two separate ice making systems.
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.
CONDENSER
FAN
MOTOR
HIGH PRESSURE
CUT OUT SWITCH
LIQUID
LINE
Refrigeration Schematic
NME1850 & FME2400
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 the
compressor, where the cycle is repeated.
System Information @ 90
Suction Pressure: 33-34 PSIG
Discharge Pressure, air cooled - 275 PSIG
Discharge Pressure, water cooled - 245 PSIG
Compressor Amps:
3 phase - 2.8
Single phase 4.3
DISCHARGE
LINE
THERMOSTATIC
EXPANSION
COMPRESSOR
January 1994
Page 15
o
F. air and 70
SUCTION LINE
EVAPORATOR
VALVE
o
F. water:
GEAR
MOTOR