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.
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.
September 2009
Page 24
N0422, F0522, N0622, F0822, N0922, F1222, N1322, F1522
Air, Water or Remote Service Manual
Refrigeration Schematic
Air Cooled
Condenser
Compressor
Discharge
Line
Liquid Line
Thermostatic
Expansion
Valve
Suction Line
Evaporator