Part Number: 040006977 Rev. 01 03/19 15
Section 3 Operation
Ice Making Sequence of Operation
INITIAN START-UP
1. Water Inlet and Pressure Equalization
Turn the toggle switch to”ON” position,the water fill valve
and harvest valve are energized, 300 seconds later, the
water fill valve is de-energized. 20seconds after the harvest
valve solenoid is energized, the compressor is energized.
300seconds after the compressor is energized, the harvest
valve solenoid is de-energized, the water pump and the fan
motor are energized,machine goes into freeze cycle.
2. Freeze Cycle
The pump sprays water into the inverted cups. The water
freezes layer by layer, until an ice cube forms in each cup.
When the”water temperature”is equal to or less than 2 °C for
more than 5 seconds, control will read
the” liquid line temperature” and dip switch setting , get the”
freeze postpone time” and “fan shut off time”.Board will shut
the Fan before the end of the freeze cycle to assist harvest.
When the ” freeze postpone time” has elapsed, the harvest
cycle is initiated.
3. Harvest Cycle
The compressor continues to operate and the water pump is
de-energized. The hot gas valve energizes, allowing hot gas
to enter and warm the evaporator. The water valve is also
energized, aiding with harvest, as well as filling up the sump
with fresh water for a new freeze cycle.
At the point of 2 minutes to freeze end , board will read the
“ liquid line temperature”again and calculate the “harvest
time”
The ice falls from the cups and is directed into the bin by the
ice chute. The harvest cycle continues until the harvest time
has elapsed, then machine goes into a new freeze cycle
4. Automatic Shut-Off
When the storage bin is full, the ice will come in contact
with the bin thermostat which is located inside the bin.
The machine will stop after approximately 45seconds of
continuous ice contact with the bin thermostat probe.
The ice machine remains off until a 3 minutes delay has
elapsed and enough ice has been removed from the storage
bin to allow the ice to fall clear of the bin thermostat probe.
As the ice clears the probe, the bin thermostat warms up and
the machine starts another freeze cycle.
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