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Refrigeration System Operation
The AFE325 uses a forced draft air cooled
condenser, capillary tube and hermetic
compressor. The system uses R-134a as a
refrigerant. High pressure, high temperature
refrigerant is forced thru the condenser where it
looses enough heat to condense. The high
pressure liquid refrigerant then passes thru the
capillary tube which causes a pressure drop in the
evaporator. As the high pressure liquid refrigerant
moves into the evaporator’s area of low pressure,
the warm water and low pressure cause the
refrigerant to evaporate and absorb heat from the
metal walls of the evaporator. After the refrigerant
has flowed thru the evaporator it goes back to the
compressor thru the suction line as a low pressure
vapor. At the compressor the cycle is repeated.
The AFE325 uses a low side pressure control as a
safety, it will shut the system down if the suction
pressure is too low for reliable operation.
System Characteristics:
Note: This ice machine has a sealed
refrigeration system. Tap into the system ONLY
when it’s absolutely necessary. After tapping
in, recovery, repair, evacuation and recharging,
the piercing valve must be removed and the
system re-sealed.
Typical Low Side Pressure*: 7 - 10 PSIG
Typical Discharge Side Pressure*: 130 - 165 PSIG
Typical Auger Drive Motor Amps (60 Hz): 2.8 - 3.1
Auger Drive Output RPM (60 Hz): 9.6
System Refrigerant Charge: 11 Ounces of R-134a
* Pressures depend upon air and water
temperatures. Numbers listed are for 70
o
F.
air/50
o
F. water and 90
o
F. air/70
o
F. water.
Evaporator
Suction Line
Compressor
Capillary Tube
Drier
Air Cooled
Condenser
Refrigeration System Schematic
AFE325
August 1994
Page 9