Hoshizaki AM-50BAE manual Thermistor

THERMISTOR

Thermistor

The AM series uses a combination thermistor and control board to control the sequence of operation. When the toggle switch is placed in the “ON” position and the bin control calls for ice, the unit will begin in the initial harvest cycle. Starting the unit in harvest allows the compressor to start in an unloaded condition, greatly extending the life of the compressor. This operation is common among all Hoshizaki cube icemakers.

During the initial harvest, the compressor, hot gas valve and water valve will be energized. The initial harvest is a timed harvest. After 50 seconds, the control board will energize the X1 board relay to start the pump motor and condenser fan motor, switching the unit into the freeze cycle.

After the initial harvest, the X2 board relay will remain energized during the freeze cycle. This allows the water valve to feed fresh water for an additional 50 seconds. This extended fill, only takes place when the unit has restarted from a power interruption or when the bin control calls for ice. During the normal harvest cycle the water valve will de-energize at the beginning of freeze or in the event of long harvest the valve will have a maximum open time of 102 seconds. This could occur in the event of operation in low water and ambient temperatures. During normal operating conditions the unit will run approximately 2~4 minutes in the harvest cycle.

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