Start-Up Start-Up Cycle; Freezing Cycle; Harvest Cycle - Scotsman MV 306 Service Manual

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START-UP
START-UP CYCLE
1. Open the water tap/valve and switch ON the
power on the electrical supply line.
2. The models MV 306-426- 456 - 606-806 enter in
the Start Up mode with the PC Board energized as
well as the Green LED of the machine under power
while the model MV 1006 enter in 90 minutes delay
time controlled by a special Start-up Delay PC Board.
BIN
POWER OPER. FULL
The Green LED of machine in operation is
energized too, blinking fast for 40 seconds.
NOTE: The model MV 1006 is equipped with
a compressor crankcase heater and a Start
up Delay PC Board set up at 90 minutes.
During the first 90 minutes only the
compressor crankcase heater is energized
warning up the compressor.
3. During the Start Up cycle the components in
operation are:
• Hot gas valve
• Water Drain Valve
• Water Pump
• Harvest assist solenoid (pusher).

FREEZING CYCLE

1. After the Start Up cycle the machine enters
directly into the Freezing cycle with the following
components energized:
• Water Inlet valve
• Compressor
• Fan motor (in continuous operation for the first
3 minutes).
2. The LED energized are:
• Machine under power
• Machine in operation (steady)
ALARM
HI
ALARM RE-SET
PRESS.
3. Water is coming into the water through the
Water Inlet Solenoid Valve till the water reservoir
if filled up to the maximum level controlled by a
Water Level Sensor.
4. 30 seconds later, the Water Pump starts up.
5. After few minutes (3-5) from the start up of
the freezing cycle, the Water Inlet Solenoid Val-
ve is activated again for few seconds to re-fill the
water reservoir up to the maximum level so to
reduce any possibility of slush ice formation.
6. In the meantime the condenser sensor starts
to transmit the current to the PC Board keeping
in operation the Fan Motor in ON-OFF mode or
continuously according to the condenser tempe-
rature.
NOTE: Do not remove the evaporator
deflector cover as it will cause the switching
off of the machine at "STORAGE BIN FULL".
7. The machine remains in the freezing cycle
with the ice that become thicker till the two metal
plates of the Ice Thickness Sensor are covered
by the water cascading through the front surface
of the ice plate.
8. When the Power is transmitted back to the
PC Board continuously through the metal plates
of the Ice Thickness Sensor for more then 6", the
machine enters in the Pre-Harvest or directly
into the Harvest Cycle mode according to:
• FAN MOTOR IN ON-OFF MODE DURING
THE PREVIOUS FREEZING CYCLE
RISE UP THE CUT IN TEMPERATURE OF
THE CONDENSER SENSOR TO 38°C (FAN
MOTOR OFF) AND EXTEND THE LENGTH
OF FREEZING CYCLE BY 30" MORE THEN
GO INTO HARVEST CYCLE
• FAN MOTOR ALWAYS IN OPERATION
DURING THE PREVIOUS FREEZING CYCLE
GO STRAIGHT TO THE HARVEST CYCLE
9. First freezing time will range between 13
and 17 minutes.
Longer time for temperature above 25°C and
shorter time required when temperature are below
25°C.
Average complete cycle time is about 15 min.

HARVEST CYCLE

1. During the harvest cycle the components in
operation are:
• Hot Gas valve
• Harvest assist solenoid (pusher)
• Water Drain/Purge Valve
• Water Pump for the first 6" every cycle and for
all harvest time every 6 cycles
• Compressor
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