Scotsman Ice Maker 600LB CM3 30inW Commercial Cubed Machine

General Commercial Service

Segments • Cubers – – Prior (CM, CM3) and Prodigy – Undercounter cuber

• Flakers – – Prior and Prodigy – Undercounter flaker – Ice maker-dispenser

• Nugget ice dispensing • Hotel dispenser • Eclipse

Recipe for Ice • Mix proper amounts of – Water – Refrigeration – Electricity

• Too much or too little of any ingredient:

– NO ICE!!!

Cuber Control Type Review • All must terminate freeze, start and finish harvest. – Four freeze cycle termination methods: • • • •

Suction line temperature plus timer Suction line temperature only Reservoir water level Direct sensing of water over ice bridge

– Four harvest cycle termination methods: • • • •

Timed Infrared light sensing ice Suction line temperature only Curtain switch

Suction Line Temperature Method • Cube Size Thermostat – Normally Open, closes on temperature fall. Sensing suction line temperature. Contacts close at preset temperature to start a timer (mechanical or electronic) to finish the cycle – Many prior models, including CM, SCE170 – Exception: CU0515 senses evaporator temperature – its closed contacts immediately trigger Harvest.

Suction Line Temperature Method • Thermistor, attached to suction line – Resistance changes with temperature – Attainment of preset resistance starts electronic timer to finish the cycle • Applies to CU50

Water Level Method – CM3 • Reservoir water level determines end of freeze • Sensed by float, stick and infrared sensor • As ice is made – Reservoir water level drops – Slot in the stick falls past the upper sensor – Triggers either • Refill or, • If all refills are complete, starts harvest.

Water Level Sensor – Photo Eyes

Lenses Water Level Sensor

Back View

Direct Sensing Method – Prodigy Cuber • Freeze continues until ice has increased in size to cause the water flowing over it to contact a sensor. • That contact triggers the controller to begin the harvest mode. Ice Thickness Sensor Contact with water makes circuit from controller to cabinet, terminating freeze

Harvest Complete • Time only – timer advances a cam, microswitch on cam stops harvest. – CU50 and SCE170 have electronic timers in controller

• Infrared sensors – harvesting ice falls between infrared emitter and detector, when no longer detected controller sets next cycle harvest time. • Evaporator temperature – CU0515. When the evaporator warms up to preset point, harvest stops. • Curtain switch – when ice pushes curtain away from switch, it triggers the controller to stop harvest.

Freeze Termination Devices

Timer

Curtain Switch

Photo Eyes

CU0515 Evaporator Thermostat

Curtain Switch - Prodigy • Switch is Open when curtain is Open – Open contacts trigger end of freeze

• Indicator light is ON when switch is Open – Unused switch light is always on

Prodigy Cuber Sequence of Operation • Batch reservoir fill system on modular cubers – One fill per cycle – Fills until water sensor satisfied

• Freezes until ice thickness sensor triggered by water contact • Harvests until curtain switch opens • Drains water and refills during part of harvest cycle

CU1526/2026/3030 Water Level • Full reservoir system, controlled by float valve • Normal water level is 1” deep at left end of reservoir

1 inch deep

Prior Cuber Sequence of Operation • CM3 type – Batch reservoir fill system • Fills reservoir until water sensor satisfied + overflow time • Some models refill during freeze – CME456 – CME810 – CME1056 – CME1356/1656 – SCE275 – refills twice

– Freezes until water drops enough to trigger harvest – Harvests until cube sensing quits – uses feedback from prior cycle

Prior Cuber Sequence of Operation • SCE170 type – Full reservoir system – uses float valve – Freezes until cube size thermostat closes, starting electronic timer in the controller to finish freeze cycle – Harvests until curtain opens – Drains during harvest

Prior Cuber Sequence of Operation • CM / DCE type – Batch reservoir fill system with inlet water solenoid valve – Fills reservoir continuously during harvest – Freezes until cube size control closes, starting timer – T