Scotsman SCCG30 - Manual (Page 19)

System Information
Overall:
•
Refrigerant: 8 oz R-134a
•
Compressor: Hermetic, 700 BTUH
•
Condenser: Forced draft
•
Fan blade: 3 blade, 6 inch
•
Evaporator: Inverted, 12 cube cells. copper,
continuous serpentine
•
Metering device: Cap tube
•
Defrost method: Hot gas bypass with water
assist
•
Spray method: 6 water jets
•
Water charge: 30 ounces
•
Water valve: 115 volt solenoid, .19 GPM
•
Water fill time: Varies with harvest time
•
Spray pump: Pedestal type.
•
Drain pump: Magnetic drive, controlled by
pressure switch
•
Purge method: Overflow standpipe
•
Control method: Electronic timer with electro
mechanical cube size thermostat
•
Cycle control: Reverse acting thermostat
•
Cube size adjustment: Thermostat cut in
change
•
Harvest cycle adjustment: Harvest timer
change, range between 2 and 5 minutes.
•
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
•
Inlet water solenoid valve
•
Freeze & harvest timer
•
Cube size thermostat
•
Hot gas valve
•
Bin thermostat
Electrical Sequence:
The machine uses a temperature initiated, timed
cycle to make ice.
A closed bin thermostat connects power to the
compressor and electronic timer. The timer NO
contacts close, connecting power to the water and
hot gas solenoids.
The compressor starts, the inlet water solenoid
valve opens and fills the reservoir. The harvest
timer starts. At the end of the pre-set harvest time,
the timer will open the NO contacts, stopping the
inlet water valve and hot gas valve. At the same
time, it closes the NC contacts, powering the fan
and pump motors. This is the beginning of the
freeze cycle.
The freeze cycle continues until the cube size
contacts close, this starts a freeze timer. No other
changes occur until the freeze timer expires, when
the NC contacts open and the NO contact close,
starting the harvest cycle.
The harvest cycle is time controlled. At the end of
the harvest cycle the unit returns to a freeze cycle.
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. The machine will stop ice making
whenever the bin thermostat contacts open.
September 2009
Page 18
SCCG30 & SCCP30
Service Manual