Controller Functions - Scotsman UF424A-1A Technical Manual

UF424 / UN324 Technical Manual

Controller Functions

All models use the same control system.
The electronic controller operates the compressor
(with fan motor), and auger drive motor, It monitors:
• Reservoir water availability
• Storage bin ice level
• Refrigeration pressure
• Auger motor speed
• Auger motor rotation
Many of these are used to insure that the machine
does not damage itself during use. For example, it is
critical that it not attempt to make ice without water, so
if the water sensor is dry, the machine will not make
ice.
Switches - there are two switches:
• On/Off - to switch the machine on or off. Holding it
in to shut off will stop ice making immediately.
• Clean - to engage the clean mode
Indicators - there are five LEDs:
• Power - Glows when controller has power
• Status - Glows when in ice making mode
• Time to Clean - Glows when it is time to clean the
machine
• Auger - glows when the auger motor is on
• Compressor - glows when the compressor is on
There is also a code display, the codes are:
- - - for off
O
- - - for ice making
F
- - - for bin full
b
- - - for controller error
E
- - - for clean mode
C
- - - for test mode
d
- - - for auger rotation direction wrong
1
- - - for auger speed too slow
2
- - - for no water sensed
3
- - - for high refrigerant pressure
4
If a number code is triggered, the controller will stop
ice making. A blinking code means it is a temporary
condition. Example: A blinking F occurs during the
ice making restart process; it stops blinking when the
compressor starts.
The controller will automatically restart from a water
interruption or power interruption or when a refrigerant
pressure switch has automatically reset.
To reset the control when it has been manually locked
out, Push and release the On/Off button to shut it Off
and then Push and release it again to switch it On.
Note: The compressor will not restart for 2 minutes
from the time it was shut off.
September 2017
Page 16