Sequence Of Operation - PRODIS C Series Technical Manual

4. SEQUENCE OF OPERATION

Once you connect the machine there is a time delay of 140" during which the water valve is activated to
ensure the water tray is filled. Compressor, pump will be off.
Once the time is up, it continues with a harvest cycle and the compressor starts.
After the harvest, the ice production starts, so the pump starts working. The pump, recirculates the water
from the water tray to the upper nozzles (#2) distributor which provides a sheet of water that sprays each
ice cube row in the evaporator (#1), in which the water starts freezing and making the ice.
When the temperature probe (#3) at the end of the evaporator reaches an adjusted value Tc (-12/-8°C) ,
the fabrication continues the fixed time with the combination of dip-switches 1-4 (see table). This way we
can ensure the filling of the ICE CUBE is correct in different working conditions.
Once the fabrication is over the harvest phase starts. The pump stops, the hot gas and the water inlet
valves open. When the evaporator temperature probe (#3) reaches an adjusted value Tg (4/0°C) the
harvest continues the fixed time with the combination of dip-switches 5-7 (see table). Water is poured
over the evaporator helping unstick the ice cubes from the plastic frame.
After the harvest cycle, the machine comes back to the production cycle.
At the beginning of each Harvest cycle, the PCB checks if the Thermostat is open or close. Once the ice
bin is full and the ice cubes cover the thermostat tube (#4), the contact open, so when the harvest
begins, the machine will stop until the contact of the thermostat close again. When it close, it starts with
a harvest cycle and then it will continue with the production cycle again.
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