Icematic M402 - Water System; Refrigeration System During Harvest

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SERVICE MODULARI 06/2014
4.2 WATER SYSTEM
• A combination of a solenoid water inlet valve with a water
level sensor is used to control the level of the water into the
reservoir/sump. A pump, running continuously, after the first
30" of freezing cycle, forces the water to the top of the evap
orator, where it is distributed through a water tube and then
cascades down the evaporator surface by gravity. As it flows
accross the refrigerated evaporator, some of the water will
be chilled enough to change form, turn to ice, and stay
frozen onto the evaporator cells.
• Most of the water returns to the reservoir, to be sucked back
into the pump, and repumped over the evaporator.
4.3 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 hot gas 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 evapo
rator and the ice frozen onto the evaporator surface melts,
releasing the frozen cubes. Ice then falls into the storage bin
pushed out by means of the harvest assist solenoid.
• 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.
4.4 WATER SYSTEM
• During the harvest cycle, the electric water drain valve is en
ergized thereby opening the drain line.
Most of the water remained in the reservoir at the end of
freezing cycle is pumpedout, to the waste, through the
water solenoid and drain line during the first part of the de
frost cycle eliminating any possible buildup and accumula
tion of minerals concentration and impurities in the water
reservoir.
• When the released ice cubes drop into the bin, they openup
for a while the bottom end of plastic deflector.
This deflector swinging motion is enough to reset the con
tact of the magnetic switch which  via electronic control
board  moves back the unit to a new freezing cycle.
• The harvest cycle lasts about 1.5 minutes.
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TELNI
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