How The Electronic Cuber Works - Scotsman CME256 Product Manual

How The Electronic Cuber Works

This section is intended for the technician. It is not
necessary for the normal operation and
maintenance of the machine.
The AutoIQ Controller operates the ice machine by
monitoring several input measures and switching
various loads on and off.
Water System:
Water flows into the ice machine during the
harvest cycle thru the inlet water valve. The water
valve will NOT be open the complete length of the
harvest cycle. The water pump forces water to the
top of the evaporators, both in the Freeze and
Harvest cycles. Un-frozen water falls thru the cube
deflector and back into the reservoir. As water is
turned into ice, the water level in the reservoir falls,
and at the point where the cubes are fully formed,
the Water Level Sensor indicates to the Controller
that it is time to begin the Harvest cycle.
During the Harvest cycle, water again enters the
water reservoir, and overfills it to rinse the
reservoir of accumulated minerals. It does
NOT overflow for a fixed amount of
time, but for a time determined by
the Controller.
The water pump will be off
for a short period of
time at the beginning
of harvest.
Compressor
Water Cooled
Condenser
CME256, 506, 656, 806: AutoIQ™ Cubers
Reservoir
Drain
Water Pump
January 2002
Refrigeration System:
The refrigeration system is similar to that of most
commercial cube ice machines. Heat is removed
from the water and discharged out the condenser
during the freeze cycle. As liquid refrigerant
passes thru the Thermostatic Expansion Valve(s),
it enters the bottom of the evaporators, and will
form on the bottom first. Model CME506E has
check valves to help direct the flow of refrigerant to
the correct distributor.
When cubes need to be released (Harvest) the Hot
Gas Bypass Valve is opened and hot discharge
gas flows directly from the compressor to the
evaporator inlets. This warms up the evaporators
and the surface of the ice frozen to the evaporator
surface melts. Ice then falls into the bin.
Hot Gas Valve
Schematic - Note: CME506 E Has
Page 15
Thermostatic
Expansion Valve
Water
Distributors
Inlet Water Valve
Water and Refrigeration
Two Expansion Valves
Evaporators
Cube
Deflector