Mdt3f & mdt4f, Refrigeration system operation – Scotsman MDT3F User Manual
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Refrigeration System Operation
Both the MDT3F and the MDT4F use a forced draft
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.
System Characteristics:
·
Typical Low Side Pressure:
13 - 14 PSIG
·
Typical Discharge Side Pressure:
135 - 175 PSIG
MDT3F & MDT4F
May 2001
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Capillary Tube
Dryer
Air Cooled
Condenser
Compressor
Evaporator
Refrigeration System Schematic