How The Electronic Cuber Works - Scotsman CME1356 User 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 AutoIQ
Controller that it is time to begin the Harvest cycle.
During the Harvest cycle, water again enters the
water reservoir, and a purge valve opens to drain
the reservoir and dilute the concentration of
accumulated minerals. The purge valve is opened
for a fixed amount of time, but the water pump
does not start right away, but at a time determined
by the AutoIQ Controller's purge setting. The
higher the purge setting,
the sooner the water pump
will start, and more water
will be drained out.
Hot Gas Valve
Water Pump
May 2000
Page 21
CME1356 and CME1656
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, it enters the
bottom of the evaporators, and will form on the
bottom first. When cubes need to be released
(Harvest) the Hot Gas 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.
Inlet Water Valve
Purge Valve
Reservoir
Water Level
Sensor
Evaporators
Cube
Deflector
Cube Port