Scotsman Ice SCCG50 Ice Maker User Manual


 
System Information
Overall:
Refrigerant: 8 oz R-134a
Compressor: Hermetic, 1300 BTUH, X HP
Condenser: Forced draft
Fan blade: 5 blade, 7 inch
Evaporator: Inverted, 24 cube cells. Copper
cups attached to continuous serpentine
Metering device: Cap tube
Defrost method: Hot gas bypass with water
assist
Spray method: 6 water jets
Water charge: 40 ounces
Water valve: 115 volt solenoid, .19 GPM
Water fill time: Varies with harvest time &
purge setting
Spray pump: Pedestal type.
Drain pump: Magnetic drive, controlled by
pressure switch
Purge method: Overflow standpipe
Control method: Electronic
Cycle control: Thermistor + timers
Freeze cycle timer: 10 minutes,+-4
Harvest cycle timer: 20 seconds,+-40
Cube size adjustment: Freeze timer change.
Harvest cycle adjustment: Harvest timer
change
Bin control: Thermostat. Opens on
temperature fall, Cut Out: 35 degrees F. Cut
In 45 degrees F. Range is adjustable.
Electrical Components:
Compressor
Fan motor
Spray pump motor
Drain pump motor
Drain pump switch
Bin light - LED type
Bin light switch - magnetic reed
Inlet water solenoid valve
Hot gas valve
Transformer
Controller
Water sensor
Thermistor
Bin thermostat
Electrical Sequence:
A closed bin thermostat signals to the controller a
need for ice. The controller checks for water, if
water is needed , the controller opens the inlet
water solenoid valve to fill the reservoir. The hot
gas valve is open to equalize the system. When the
reservoir is full, the compressor, fan motor, water
pump are switched on. After 5 seconds the hot gas
valve shuts and ice making begins.
Water is sprayed up into the inverted cup mold. As
the water is cooled and ice begins to form in the
cups, the temperature of the evaporator will fall.
The freeze cycle continues until the temperature of
the thermistor attached to the evaporator outlet
tube falls to about zero degrees F. At that point the
controller starts a freeze cycle timer, whose default
time is 10 minutes. At the end of the freeze cycle's
timed portion the controller switches to the harvest
cycle.
The harvest cycle begins with the controller
stopping the water pump and fan motor. At the
same time it opens the hot gas valve and the inlet
water solenoid valve. The ice is released by the
combination of discharge refrigerant gas entering
the evaporator serpentine and warming up the
copper, plus the inlet water that flows to the
evaporator, floods across the plastic platen to
warm it up and be pre-chilled for the next cycle. Ice
cubes drop individually and harvest continues until
the thermistor attached to the suction line warms
up to about 50 degrees F. At that point a harvest
timer starts, whose default time is 20 seconds. At
the end of that time the harvest cycle ends and the
freeze cycle restarts.
Bin control.
The machine's on and off modes are regulated by a
bin thermostat. The cap tube for the bin thermostat
is in the tube that holds the scoop. The machine
will only begin ice making when the thermostat's
contacts close. If the contacts re-open before the
temperature of the evaporator drops below a preset
point, the machine will stop. If the temperature is
below that point when the contact s open, the
machine will continue through a complete cycle
and stop at the end of the harvest cycle.
September 2008
Page 19
SCCG50 & SCCP50
Service Manual