Scotsman UF424A-1A, Техническое руководство

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UF424 / UN324 Technical Manual
September 2017
Page 19
Electrical Sequence
When electrical power is connected, and the prior
mode was Off, the controller verifies the voltage and
performs a self check. If the self check confirms the
controller is working and that water is sensed in the
reservoir, it will display an
O
and blink the Status light.
If the prior mode was ice making, the controller will
also perform a self check, when it is successful it will
begin a restart process and display
F.
If no water is sensed, the controller will not allow
ice making, but instead a
3
will show in the display,
indicating that no water has been sensed. When
water is sensed, and the bin control is calling for ice
and at least two minutes have passed, the controller
will automatically start ice making.
Note: A failure of the self check will result in the
controller displaying an
E
and no other action will
occur.
After a successful restart, the controller will switch on
the compressor and auger motor to begin ice making.
The controller’s compressor relay supplies power to
the contactor coil while the auger motor’s power is
supplied directly from the controller’s auger relay. If
the unit is air cooled, the fan motor will also start, as it
is electrically tied to the compressor contactor.
Ice making continues until the infrared light is blocked
and the unit shuts down on bin full. It can also stop
from any of these safeties:
1. Hi pressure cut out: 230 PSIG, automatic reset
when the pressure drops to 190 PSIG. If triggered,
it signals a severe condition where there was
either no fan blade rotation on air cooled models
or no water supplied to water cooled models.
2. Auger motor overload. Immediate shut down,
manual reset. This signals a condition where the
auger motor could not rotate the auger at the
correct current.
3. Auger motor reversal. Immediate shut down,
manual reset. Auger motor failure.
Manual reset - restart process: Push and release the
On/Off button, unit will display
O
. To restart: push and
release the On/Off button again.
Manually shut down either by pushing and releasing
the On/Off button (compressor shuts off, auger motor
continues for a minute) or by holding in the On/Off
button until the machine completely stops.
Timings
• Status changes from Bin Full to Bin Empty: 10
second delay.
• Status changes from Bin Empty to Bin Full. 6
second delay
• Auger motor on after bin full or timed shut down:
60 seconds.
• Compressor restart after off: 2 minutes.
• Hi pressure control reset time: Varies by ambient
and cabinet temperature. Longer in high
temperatures.
• Clean mode: 20 minutes of auger only operation
and then 20 minutes of auger and compressor
operation. 40 minutes total.