Hoshizaki KM-280MAH-E Manual De Instalación página 6

ENGLISH
6) Turn off the power supply, and remove the Front
Panel and the Base Cover.
7) Remove one end of the Pump Tubing and drain the
Water Tank, (See Fig. 4) to flush any loose debris.
8) Replace the Pump Tubing and the Base cover in
their correct positions.
9) Clean the Storage Bin.
10) Replace the Front Panel in its correct position.
11) Turn on the power supply, and start the automatic
icemaking process.
Fig. 4 Fig. 4
Fig. 4 Fig. 4 Fig. 4
12) Wait until a complete icemaking and defrost cycle
is completed.
BIN CONTROL CHECK BIN CONTROL CHECK BIN CONTROL CHECK BIN CONTROL CHECK BIN CONTROL CHECK
1) With the Front Panel in place, remove the thumb-
screws along the upper edge of the storage bin ice
deflector and allow it to pivot on the side fixings.
2) Hold some ice against the Bin Control Bulb. The
icemaker should stop within 10 seconds.
3) Replace the thumbscrews and close the bin door.
4) Check that the icemaker re-starts.
8. OPERATION 8. OPERATION 8. OPERATION 8. OPERATION 8. 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 addi-
tional 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 defrost timer which is
factory set for normal conditions. This adjustment
can vary the defrost timer from 1 to 3 minutes.
3) Freeze Cycle
After the timer terminates the harvest cycle, the hot
gas and water valves close, and the ice production
cycle starts. For the first 5 minutes the controller
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 termi-
nates ice production.
4) Harvest Pump Out
When the float switch opens and signals the comple-
tion of the freeze cycle, the harvest cycle begins.
The hot gas valve opens and the compressor con-
tinues to run. The drain timer starts counting the 10/
20 second pump out.
The water pump stops for 2 seconds and reverses,
taking water from the bottom of the sump and
forcing pressure against the check valve seat allow-
ing 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
drain timer stops counting, the pump-out is com-
plete.
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