Air Cooled Refrigeration - Scotsman Prodigy Plus A Series Service Manual

NH0422, NS0422, FS0522, NH0622, NS0622, FS0822, NH0922, NS0922, FS1222, NH1322, NS1322, FS1522
Air, Water or Remote Service Manual

Air Cooled Refrigeration

The compressor concentrates the heat from ice
making into high pressure, hot discharge gas. The
high pressure forces the gas to the water cooled
condenser.
At the condenser, refrigerant gas flows through a
serpentine tube that is connected to fins. Room air
is forced by a fan motor through the fins. As the
relatively cooler air comes in contact with the fins and
tubing, heat flows from the hot refrigerant gas into the
fins and tubing and into the cooler air passing over
them. When the refrigerant cools, it condenses into a
liquid.
From the condenser the high pressure liquid
refrigerant flows through the liquid line to the metering
device - a thermostatic expansion valve.
At the expansion valve, liquid refrigerant passes from
a high pressure zone to one of relatively low pressure,
and in the low pressure zone it evaporates.
Air Cooled Condenser
The low pressure zone where the refrigerant
evaporates is the evaporator. The evaporator is a
vertical metal tube surrounded by a coil of tubing,
which the refrigerant flows through. As refrigerant
evaporates in the coil, it absorbs heat from the metal
parts of the evaporator and the water inside it. As the
auger inside the evaporator turns, ice is continuously
forced out of the evaporator and make up water flows
in.
From the evaporator, the refrigerant, carrying the
heat from ice making, flows back to the compressor
through the suction line, and the cycle continues
Discharge Line
Suction Line
Refrigeration Schematic
July 2020
Page 27
Evaporator
Compressor
Liquid Line
TXV