94
Evaporator Probe: Provides evaporator temperature information to the control board to begin and
end the defrost cycle. Adjust the left potentiometer on the control board to determine ice cube
fullness. Turn CW to extend the freeze time and CCW to shorten it.
NOTE: Ice cubes should never be frozen completely full. A small dimple in each cube
indicates a proper adjustment. Making cubes without a dimple will reduce ice machine
capacity and may cause damage to the water plate and operating mechanism.
Bin Probe: This probe will sense contact with the ice, when the bin is full and turn off the ice
machine. When ice is used and is no longer in contact the probe, it will signal the control to turn on
the ice machine. When the ice machine is off due to a full bin, the code 90 indicator will be lit on the
control board. Contact with ice should turn off the ice machine within one minute.
If adjustment is required, hold ice against the probe. Turn the right side potentiometer on the control
board CCW to shut off the machine within one minute. CW adjustment is required if the ice machine
shuts down, as if the bin is full, when ice has not contacted the probe.
Plate-Up Switch: This switch limits the upward travel of the water plate. It opens to de-energize the
actuator motor, by way of an operator when its shaft is in the full up (closed) position.
This switch also provides a way for the controller to determine that the plate is blocked. When the
plate is closing, the controller provides a time limit for this switch to open. If the time limit is
exceeded, the controller will reopen the water plate to clear it. This will repeat until the surface is
clear.
Plate-Down Switch: This switch limits the downward travel of the water plate. It opens to de-
energize the actuator motor, by way of an operator when its shaft is in the full down (open) position.
Sequence of Operation
The following tables describe the general states and sequence of operation for the ice machine
models in ice-making mode with an additional table depicting the status when the ice bin is full and
the cleaning mode. The charts provide information about the inputs to the controller and the
corresponding AC outputs associated with each part of the ice making cycle.
Note:
• Abnormal operation of the ice machine is covered in the Fault Condition section of the
manual.
Ice Making Sequence
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