3-6
n
THEORY OF OPERATION
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 (if unit thermistor is below
115°F) and then the water recirculating pump.
The reservoir drain pump is activated to fully
drain the reservoir. Power is then supplied to
the water valve once. The fill valve fills to the
requested volume, and the hot gas valve is
energized. The hot gas valve is energized
until the evaporator thermistor reaches 52°F.
If the evaporator thermistor is unplugged, the
evaporator defaults to a timed 4 minute har-
vest.
If the water level sensor is disconnected or
open, the control defaults to 25 minutes of
freeze time. The cleaning indicator LED fea-
ture will not function if the water level sensor
is disconnected.
Refrigeration System
The hot gas valve opens, allowing high pres-
sure refrigerant gas to bypass the condenser,
and fl ow 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 fi lled, allowing water to
fl ow into
the
water reservoir pan. The water
fi ll volume is determined by the ice thickness
setting.
As a result of the hot gas fl ow and the ice sliding
off the evaporator plate, the evaporator tem-
perature begins to rise. When the evaporator
thermistor reaches the set temperature (52°F),
or 33.8°F when the unit thermistor is above
115°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 vari-
ous 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.
For the order of the components cycled, see
the fl ow chart on page 6-13.
Water System
When the service control switch is in the “Clean”
position, the water recirculating 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.
DIAGNOSTIC MODE
1. Do not continue with the diagnosis of the ice
maker if a fuse is blown, a circuit breaker
is tripped, or if there is less than a 120 volt
power supply at the wall outlet.
2. All units that have failed during the fi rst few
days of use should be checked for loose
connections or miswiring.
Entering and Navigating — Manual
Diagnostics
• Turn
the product on. Within 10 seconds of
Power On, press and hold the On and the
Clean button. Release both buttons when
all user interface LEDs begin to fl ash.
• Within 5 seconds of all LEDs fl ashing, push
Max Ice (Fast Ice) button on the user
interface. This begins manual diagnostics.
• If no button is pressed within 5 seconds, the
product goes into the automatic diagnostic
mode used at the assembly plant. Each
component is cycled for 5 seconds.
• The Max Ice (or Acceler Ice button on some
models) is used to advance through each
step.
• To exit manual diagnostics, press the ON/OFF
button.
Operating Systems (Cont.)
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