Scotsman C2648 - Manual (Page 31)

C2648 Prodigy and Prodigy Plus Service Manual
January 2015
Page 31
Electrical Component Details
Controller
• Senses ice thickness, water level, water temperature, discharge temperature. Controls compressor
contactor, fan motor, water pump, inlet water valve, hot gas valve, purge valve, harvest assist solenoid.
Indicates status and component operation. 12 volt.
Transformer
• 12 volt secondary, supplies power to controller only.
Water Level Sensor
• Three probe conductivity sensor. Longest probe is common, mid probe is refill sump, top probe is full sump.
Refill can occur at any time.
Ice Thickness Sensor
• Single wire conductivity sensor. Circuit made from controller to ground to controller when water contacts a
probe suspended over ice plate. Signals ready for harvest.
Curtain Switches
• Magnetic reed switch. Normally open, switch is closed when magnet is nearby. This model has three
curtain switches. Curtains may be removed in the freeze cycle without affecting controller operation. A
curtain removed during harvest will cause the controller to terminate harvest and shut the unit off. All
curtains must open to terminate harvest, and if any one remains open for 30 seconds that signals the
controller to shut the unit off on bin full.
Water temperature sensor
• Thermistor inserted into the water pump discharge hose.
Discharge temperature sensor.
• Thermistor attached to the discharge line near the compressor. Reported temperature used by the
controller to determine end-of-cycle-fan-off-delay time. If discharge temperature exceeds a preset
maximum, controller will shut the machine off.
Note: Controller will operate machine in a default mode with thermistors disconnected from the
controller. Diagnostic code #5 or 7 will be displayed during that time.