21
HARVEST CYCLE
REFRIGERATION SYSTEM SCHEMATIC
REFRIGERATION SYSTEM DURING
HARVEST
The refrigeration system performs the harvest
of ice by use of a hot gas bypass valve. When
the time comes to de-ice the evaporators, the
harvest valve is energized, and the high
temperature, high pressure gas bypasses the
condenser, and is allowed directly into the
evaporator. The high pressure gas is cooled by
the cold evaporator so it condenses into a
liquid, giving up its heat as it does so. This heat
warms the evaporator and the ice frozen onto
the evaporator surface melts, releasing the
frozen cubes. Ice then falls by gravity into the
storage bin.
The liquid refrigerant goes through the suction
line into the heat exchanger where it boils-off so
that only refrigerant vapor is drawn into the
suction tube of the compressor.
WATER SYSTEM
During the harvest cycle, the electric water
drain valve is energized thereby opening the
drain line.
All water remained in the reservoir at the end of
freezing cycle is pumped-out, to the waste,
through the water purge valve and drain line,
eliminating any possible build-up and
accumulation of minerals concentration and
impurities in the water reservoir.(According DIP
Switch #6 setup)
20” after the Purge Valve open, the Water Inlet
Solenoid Valve is energized for 10 seconds
only in order to have a short flush of fresh water
into the sump while the Water Pump and Purge
valve are still in operation
When the released ice cubes drop into the bin,
they open-up for a fraction of a seconds the
bottom end of plastic deflector.
This deflector swinging motion is enough to
reset the contact of the magnetic switch which
- via PC board de-energizes the water drain
valve allowing the unit to initiate a new freezing
cycle. The harvest cycle lasts about 1.5-2
minutes.
