Scotsman CME306 - Manual (Page 21)

How This Machine 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.
CME306 & CME456
January 2000
Page 21
Purge Valve
Water Pump
Water
Reservoir
Water
Distribution
System
Water Inlet
Valve