Harvest Cycle:
The ice maker continures to freeze the water into
ice unitl 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
o
F., the ice size
thermotstat 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.
Inlet
Water
Valve
Water
Pump
(Off)
Evaporators
Water Distribution
System
Hot Gas Valve (Open)
Suction Line
Thermostatic
Expansion Valve
Condenser
Dryer
Compressor
Discharge Line
Water Reservoir
Refrigeration Schematic
Fan Motor
(Off)
Siphon
Tube
(Draining)
SLE300
January 1995
Page 17
