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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.
Thermistor
THERMISTOR