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Model 506 (UC Ice Maker)
Model 506 (UC Ice Maker)
Theory of Operation
3-3
#3752200 - Revision B - May, 2006
Refrigeration Flow - Ice Making Cycle
gas refrigerant, under high pressure, is forced through
the condenser where heat is removed. The refrigerant
is condensed to a liquid, then flows through the drier
and capillary tube into the evaporator. Under low pres-
sure in the evaporator, the liquid refrigerant absorbs
heat from the water flowing over the evaporator. The
refrigerant evaporates into a gas and passes into the
accumulator. As a low pressure gas, the refrigerant
flows back through the heat exchanger and suction
tube to the compressor.
During ICE MAKING cycle, some of the hot gas that is
in the condenser accumulating tube condenses to a liq-
uid and remains in the accumulating tube.
During the later stages of the ICE MAKING cycle, as
the ice slab forms on the evaporator freezing plate,
some of the refrigerant passing through the evaporator
will not evaporate into a gas, but will remain a liquid.
This liquid refrigerant will settle in the accumulator while
the refrigerant gas will be sucked off through the suc-
tion tube at the top of the accumulator. This accumulat-
ed liquid refrigerant will be evaporated eventually by the
warmed refrigerant gas passing through the accumula-
tor during the HARVEST cycle and during the beginning
of the next ICE MAKING cycle.
NOTE:
It is very important the accumulator is not tilted
out of a horizontal position.
Evaporator
Accumulator
Capillary Tube
Suction
Tube
Compressor
Drier
Condenser
Condenser
Accumulating
Tube
Hot Gas
Valve
High Pressure Refrigerant Gas
High Pressure Liquid Refrigerant
Low Pressure Liquid Refrigerant
Low Pressure Refrigerant Gas
Liquid Refrigerant
in Accumulating Tube
Heat
Exchanger
Figure 3-2. Refrigeration System
(During Ice Making Cycle)
