Scotsman SCE275 - Manual (Page 17)

SCE275
January 2003
Page 17
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 to the full cube
setting, and the Water Level
Sensor sends a signal to the
AutoIQ Controller to open
the inlet water valve to refill
the reservoir. This happens
twice per freeze cycle.
The third time the water
level falls to the full cube
setting it indicates to the
AutoIQ Controller that it is
time to begin the Harvest
cycle. The air cooled fans
will shut off just before the
beginning of 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 AutoIQ
Controller.
The water
pump will be
off for a short
period of time at
the beginning of
harvest.
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.
The evaporators are in series: As liquid refrigerant
passes thru the Thermostatic Expansion
Valve, it enters the bottom of the front
evaporator, and ice will form there first.
Refrigerant then flows out the top of the
front evaporator and enters at the
bottom of the back evaporator,
finally flowing out the top row
of the back
evaporator
and back to
the
compressor.
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
front evaporator
inlet. This warms
up the
evaporators and the
surface of the ice
frozen to the
evaporator
surface melts. Ice
then falls into
the bin.
Condenser
Water Inlet
Evaporator
Water Inlet
Valve
Fan Motor
Thermostatic
Expansion
Valve
Filter/Dryer
Compressor
Hot Gas
Valve
Reservoir
Drain
Water
Pump
Water Level
Sensor