How It Works:
Refrigeration: Freeze Cycle:
From the compressor, hot discharge gas is
pumped to the remote air cooled condenser.
At the condenser, if the discharge pressure is over
225 PSIG, the discharge gas will flow thru the
condenser coil. Heat from the refrigerant flows into
the air, and the refrigerant condenses into a liquid.
If the discharge pressure is below 225 PSIG, the
refrigerant will not flow thru the coil, but will be
forced into the liquid line.
From the condenser the liquid refrigerant flows
through the liquid line to the liquid line check valve.
When the machine is on, the check valve is open
to flow from the condenser to the receiver.
From the receiver, refrigerant then flows to the
metering device - a thermostatic expansion valve.
At the expansion valve, the 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. When
the refrigerant evaporates, it absorbs heat from the
metal parts of the evaporator and the water flowing
over it.
From the evaporator, the refrigerant flows back to
the compressor through the suction line.
Note: During the time that the machine is off, the
the pump down system (liquid line valve) keeps
the refrigerant out of the low side of the system,
and the liquid line check valve keeps liquid
refrigerant from flowing back into the liquid line and
remote condenser.
Water:
Water flows into the ice machine from its inlet
connection at the back of the cabinet, through the
inlet water valve and into the reservoir. The water
in the reservoir is pumped up and through the
water distributor tube at the top of the evaporators.
From there, the water flows over both sides of the
evaporators and back into the reservoir.
Melted ice and water spills into the bin flow
through a drain in the base of the bin to the
exterior drain connection at the back of the cabinet.
Refrigeration: Harvest Cycle:
The ice maker continues to freeze the water into
ice until the ice next to the ice size thermostat
probe has become thick enough to force water
over the probe. After the cold water has reduced
the temperature of the probe to 38
0
F., the ice size
thermostat will switch the machine into the harvest
cycle.
During the harvest cycle, the refrigerant flows from
the condenser, through the discharge line to a
branch in the line containing the Hot Gas Valve.
This valve is Open during the harvest cycle,
allowing the hot discharge gas to bypass the
condenser and enter the evaporator at its inlet.
The hot discharge gases warm up the evaporator
enough to allow the surface of the ice frozen to the
evaporator to melt. The remaining ice will then fall
off into the bin.
During the Harvest Cycle, the water level rises,
filling the reservoir over the siphon tube and
siphoning some of the reservoir water out to the
drain. The harvest cycle continues until the suction
line warms up enough to cause the harvest
termination thermostat to switch the machine back
into the freeze cycle.
SLE400R
January 1995
Page 17
(24 paginas)
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