Scotsman CME865R - Manual (Page 22)

FREEZING CYCLE OPERATION
Water from the sump assembly is pumped to the
water distributor system at the top of each
evaporator plate. From the water distributor the
water cascades by gravity over all cells of the plate
and to the sump assembly below.
At the beginning of the freezing cycle the water
pump, fan motor and compressor have power. The
water pump operates continuously, through both
the freezing cycle and the harvest cycle.
During the freezing cycle, the hot gas solenoid
valve and the water inlet solenoid valve are
CLOSED. When the ice cubes are partially
formed, the cube size control will CLOSE. This will
complete an electrical circuit to the timer motor.
The timer will keep the ice maker operating in the
freezing cycle for a selected length of time. This
will give the ice cubes time to fully form. After that
selected length of time, the timer will switch the ice
maker into the harvest cycle, through the contacts
of the timer assembly micro switch.
EVAPORATORS
DISCHARGE LINE
REFRIGERATION SYSTEM SCHEMATIC
Low Temperature Freeze:
When the outside air temperature is
low, the Head Pressure Regulator will
close off the liquid line to the receiver,
causing liquid refrigerant to back up
into the condenser until the head
pressure builds up to 220 PSIG. While
this is occurring, the head pressure
regulator passes discharge gas into
the receiver to keep the refrigerant
flowing.
CME865R & CME1002R
September, 1994
Page 22