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Sub-Zero 315I User Manual

Sub-Zero 315I
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Theory of Operation
Model 315I (UC Ice Maker)
3-2
#3757320 - Revision B - August, 2005
OPERATING SYSTEMS
There are three operating systems in the icemaker:
Refrigeration System
Water System
Electrical System
Refrigeration System
The following components have been listed in the order
of refrigerant flow, with an explanation of their function
as part of the refrigeration system. Without delving too
deeply into the operating cycles, which will be covered
later, for our purposes the ice making cycle is used.
(See Figure 3-1)
Compressor: The compressor creates a high side
and low side pressure difference in the refrigeration
system by compressing the refrigerant gas, thus rais-
ing the pressure and temperature. During the ice
making cycle the compressor pushes this high-pres-
sure/high-heat gas to the condenser.
Condenser: The high-pressure/high-heat gas travels
through the condenser, where the heat is dissipated
by cooler air being drawn over the condenser tubing
by the condenser fan. This changes the gas into a
high-pressure/warm liquid that then enters the filter-
drier.
Filter-Drier: The high-pressure/warm liquid travels
through the filter-drier, which removes moisture from
the refrigerant before it enters the capillary tube.
Capillary Tube: The warm liquid refrigerant travels
through the skinny capillary tube which is wrapped
around the suction line and accumulator. As the
warm liquid refrigerant travels through the capillary
tube it gives up heat to the cool vapor refrigerant in
the accumulator and to the cool refrigerant gas travel-
ing through the suction line. As the refrigerant in the
capillary tube gives up heat, the pressure drops, so it
is a low-pressure/cool liquid before it enters the evap-
orator.
Evaporator: A dramatic pressure drop occurs as the
low-pressure/cool liquid refrigerant leaves the small
diameter capillary tube and enters the larger diameter
evaporator tubing, and the refrigerant begins to
vaporize. This vapor travels through the evaporator
absorbing heat from the water being sprayed on the
evaporator. This cool vapor then enters the accumu-
lator.
Accumulator: Another pressure drop occurs as the
cool vaporized refrigerant leaves the evaporator tub-
ing and enters the larger diameter accumulator tub-
ing. Any liquid or vaporized refrigerant that may
remain at this point is converted to gas. The capillary
tube is wrapped around the accumulator to give up
heat to the refrigerant in the accumulator before it
enters the suction line.
Suction Line: The cool gas travels through the suc-
tion line which is also partially wrapped with the capil-
lary tube. As this cool refrigerant gas travels through
the suction line it too absorbs heat from the warm liq-
uid refrigerant traveling through
the capillary tube. This assures
that it is a luke warm gas before it
enters the compressor, where the
process begins again.
NOTE: There is an additional
component in the ice maker refrig-
eration system which is used dur-
ing the harvest cycle, this compo-
nent is called the hot gas valve.
Its function is described below:
Hot Gas Valve: During a har-
vest cycle, the hot gas valve inter-
rupts the flow of high-pressure/
high-heat gas from the compres-
sor, diverting it past the condens-
er, filter-drier and capillary tube,
directly to the evaporator. This
high-pressure/high-heat gas
warms the evaporator so that the
ice cubes release from the cube
molds.
Compressor
Filter-Drier
Condenser
Hot Gas Valve
Evaporator
Accumulator
Capillary
Tube
Suction
Line
(closed)
Figure 3-1. Refrigeration System (During Ice Making Cycle)

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Sub-Zero 315I Specifications

General IconGeneral
BrandSub-Zero
Model315I
CategoryIce Maker
LanguageEnglish

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