Hoshizaki KM-1301SAH-E Manual De Instalación página 8

ENGLISH
9. Operation
The steps in the start-up/operation sequence are as
follows:
1) 1 Minute Fill Cycle
The unit always starts in the 1 minute fill cycle.
When power is applied to the unit, the water valve is
energized and the fill period begins. After 1 minute
the board checks for a closed float switch. If the
float switch is closed the harvest cycle begins. If
not, the unit will not start without adequate water in
the sump. This serves as a low water safety shut
off. The water valve will remain energized through
additional 1 minute cycles until sufficient water
enters the sump and the float switch closes.
2) 1st Harvest Cycle
The compressor starts, hot gas valve opens, water
valve remains open, and harvest begins. As the
evaporator warms, the thermistor located on the
suction line checks for a 9°C temperature. When
9°C is reached, the harvest is turned over to the
adjustable control board harvest timer which is
factory set for normal conditions. This adjustment
can vary the harvest timer from 1 to 3 minutes. The
water valve closes and the pump motor runs for the
last 50 seconds of harvest.
3) Freeze Cycle
After the timer terminates the harvest cycle, the hot
gas valve closes, and the freeze cycle starts. For
the first 5 minutes the control board will not accept a
signal from the float switch. This 5 minute minimum
freeze acts as a short cycle protection. At the end of
5 minutes the float switch assumes control. As ice
builds on the evaporator the water level in the sump
lowers. The freeze continues until the float switch
opens and terminates ice production.
4) Harvest Pump Out
When the float switch opens and signals the
completion of the freeze cycle, the harvest
cycle begins. The hot gas valve opens and the
compressor continues to run. The pump-out timer
starts counting the 10/20 second pump out.
The water pump stops for 15 seconds and reverses,
taking water from the bottom of the sump and
forcing pressure against the check valve seat
allowing water to go through the check valve and
down the drain. At the same time water flows
through the small tube to power flush the float
switch. When the pump-out timer stops counting, the
pump-out is complete.
The control board allows for adjustment of pump-out
to occur every cycle, or every 2nd, 5th or 10th cycle.
5) Normal Harvest Cycle
The water valve opens to allow water to assist the
harvest. As the evaporator warms, the thermistor
reaches 9°C. The control board receives the
thermistor signal and starts the harvest timer. The
water valve closes and the pump motor runs for
the last 50 seconds of harvest. When the harvest
timer completes its countdown, the harvest cycle is
complete and the next freeze cycle starts.
The unit continues through 3), 4) and 5) sequence
until the bin control senses ice and shuts the unit
down.
Note: If the icemaker does not start or complete
a cycle of operation, contact your nearest
Hoshizaki Distributor for guidance.
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