Service Manual

SCCG50 & SCCP50
Service Manual
December 2019
Page 19
System Information A Model
Overall:
• Refrigerant: 8 oz R-134a
• Compressor: Hermetic, 1300 BTUH
• 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 ll time: Varies with harvest time & purge
setting
• Spray pump: Pedestal type.
• Drain pump: Magnetic drive, controlled by
pressure switch
• Purge method: Overow standpipe
• Control method: Electronic
• Cycle control: Thermistor + timers
• Freeze cycle timer A model:10 minutes, + - 4
• Freeze cycle timer B model :11 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 ll 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 0°F A model and 3°F B model. At
that point the controller starts a freeze cycle timer,
whose default time is 10 minutes for A model and
11 minutes for B model. 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 ows to
the evaporator, oods 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°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.