Harvest Mode
Electrical System
When the water level in the reservoir drops below
the water level sensor it signals the electronic
control to terminate power to the condenser fan,
and then the water recirculating pump. The
reservoir drain pump is activated to fully drain the
reservoir. Power is then supplied to the hot gas
valve and a fill request is sent to the measured fill
valve. The fill valve fills to the requested volume
while the hot gas valve is energized for the balance
of the harvest mode.
If the evaporator thermistor is unplugged, the
evaporator defaults to a timed 4 minute harvest.
If the water level sensor is disconnected or open,
the control defaults to 25 minutes of freeze time.
The cleaning indicator LED feature will not function
if the water level sensor is disconnected.
Refrigeration System
The hot gas valve opens, allowing high pressure
refrigerant gas to bypass the condenser, and flow
through the condenser accumulating tube. The hot
gas pushes the liquid refrigerant that has
accumulated in the accumulator tube up into the
evaporator. The hot liquid refrigerant evenly heats
the evaporator plate so that the ice slab releases
quickly and evenly.
The ice slab, when released, slides off of the
evaporator plate onto the cutter grid.
Water System
The electronic control board sends a signal to the
water valve. The signal tells the water valve how
much water to be filled, allowing water to flow into
the water reservoir pan. The water fill volume is
determined by the ice thickness setting.
As a result of the hot gas flow and the ice sliding off
the evaporator plate, the evaporator temperature
begins to rise. When the evaporator thermistor
reaches the set temperature (52°F), the unit
switches to the Freeze mode. This cycling between
Freeze and Harvest, continues until the ice bin is
full.
The electronic control board operates the various
components and systems in the ice maker for each
of the Freeze and Harvest modes.
Clean Mode
Electrical System
The electronic control board operates the various
components and systems during the Clean mode.
Water System
When the service control switch is in the “Clean”
position, the water pump circulates the cleaning
solution that has been added to the reservoir, up to
the water distributor, across the evaporator, and
back into the reservoir, where it is recirculated. The
compressor and hot gas valve operate to heat the
evaporator.
July 2007
Page 8
CS0415
Service Manual
