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Small Flakers Small Flakers • AFE400 • AFE325 • MFE400...
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Small Flakers Small Flakers • Flaked Ice Only – AFE325 and AFE400 are Self Contained – MFE400 is Modular – AFE400 and MFE400 available in air cooled or water cooled configurations – AFE325 is only available as an air cooled model...
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Small Flakers Small Flakers • Air Flow In the Front, Out the Sides and Back In the Front, Out the Left Side and Back In and Out the Front...
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MFE400 Back View MFE400 Back View Ice Chute Water Evaporator Pressure Switch Water Inlet Gear Box Overflow Drain Hose...
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MFE400 Installation MFE400 Installation Shipping Position Assemble Ice Chute with pre-mounted Thermostat...
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Small Flaker Refrigeration Small Flaker Refrigeration • Brass Evaporators • R-134a • Cap Tube – AFE325, MFE400 • Expansion Valve – AFE400...
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Small Flaker Maintenance Small Flaker Maintenance • Cleaning – Condenser – Water System • Lubrication – Grease Coupling...
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Small Flaker Controls Small Flaker Controls • Electro-Mechanical – Bin Thermostat – Auger Delay Pressure Control – Water Pressure Switch – Centrifugal Switch on Auger Motor...
Typical Wiring Schematic Typical Wiring Schematic Water Thermostat Press. Sw. Cent. Compressor Master Switch Fan Motor Auger Delay Auger Motor...
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Small Flakers Small Flakers • What could be wrong if the machine has power but will not start? – Open bin thermostat – No water pressure – Open auger motor windings – Any of the above...
Refrigeration Service Refrigeration Service 134a 134a HFC Leak Detectors HFC Leak Detectors Evacuate to Evacuate to Weigh In Charge 300 microns Weigh In Charge 300 microns Use Nitrogen Purge Use Nitrogen Purge...
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Small Flaker Summary Small Flaker Summary • One Modular • Two Self Contained • R-134a • Small Auger Drive Motor (1/10 HP) • Electro-Mechanical Controls...
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NME Nugget or FME Flake NME Nugget or FME Flake • Condensing Types: – Air Cooled – Water Cooled – Remote Air Cooled – Remote Low Side...
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Large Modular Flakers Large Modular Flakers • 21" Wide • 30” Wide • 42" Wide...
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” and 42 ” Wide ” and 42 ” Wide • Right Side View – Service Panel Removed – Right Side Panel May Also Be Removed Auger Motor...
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Service Panels Service Panels • Left Side View – Service panel removed – Side panel may also be removed Compressor...
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Air Flow Air Flow • Two screws & two snaps hold the front panel on • Cleanable Air Filter • System access ports at the front...
Initial Start Up Initial Start Up • Remotes – 4 hour wait after electrical connection for crankcase heater soak out • All others, switch Mode switch to ON – No bin control to install...
Control System Control System • Use Tester for Ice Sensor Check – Prior - connect at circuit board – AutoSentry - connect tester at ice sensor connections...
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Current Control System Current Control System AutoSentry Water OK Power OK Service Freeze Bin Full LED1 Compressor Relay LED3 Auger Relay...
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AutoSentry Control AutoSentry Control • Indicator Lights – Blinking Light Indicates a Pending Change • Starting • Shutting Down – LED1 and LED3 Lights • Indicate Control Has Powered that Relay’s Coil • Example: LED3 is ON, Auger Motor Should Have Power To It...
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AutoSentry Timings AutoSentry Timings • No ice sensed for 10 seconds – Result: Start Up • Ice sensed for 6 consecutive seconds – Result: Shut Down • Unit Shuts Down – Auger Motor Delay runs 1 more minute – Compressor will not restart until 2 minutes have passed since shut down...
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Lights On Making Ice Lights On Making Ice AutoSentry Water OK Power OK Freeze LED1 Freeze light blinks during 2 minute Restart Delay. LED3...
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Lights On No Water Lights On No Water AutoSentry Water OK Power OK Water OK Blinks Until Auger Motor Shuts Off, Then Then it and LED3 Are OFF LED3...
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Supply Interruptions Supply Interruptions • Water – Automatic Restart • After 2 Minute Restart Delay – 2 Minute Timer Starts After Shut Down • Power – Automatic Restart • After 2 Minute Restart Delay – 2 Minute Timer Starts After Power Restoration...
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Lights On Auger Motor Stalled Lights On Auger Motor Stalled AutoSentry Water OK Power OK Service Service Light Blinks During the Restart Period Glows Continuously When Board Must be Manually Reset.
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Lights On Bin Full Lights On Bin Full AutoSentry Water OK Power OK Bin Full Bin Full Blinks Until the Auger Motor Shuts OFF. Then Bin Full is ON and LED 3 is OFF LED3...
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AutoSentry Control AutoSentry Control Water Power Service Freeze Bin Full LED1 LED3 Normal – making ice Normal - Auger Blinking Motor Problem Cut Out Open...
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Prior Control System Prior Control System • Water Sensor – Thermistor Probe – Diagnose with Tester – Cannot be used with AutoSentry Board Tip Must Be Clean...
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Current Control System Current Control System • Water Sensor – Conductivity Probe – Cannot be used with prior control board – Located in Reservoir – No tester needed • Use ohmmeter or • By-pass to ground Tip Must Be Clean...
Conductivity Probe Conductivity Probe Water • Probe’s Circuit Level – From Control Board Probe – To Probe – To Tip – Through Water – To Evaporator – To Chassis (Ground) – Back to Control Board Evaporator Inlet...
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Testing Water Sensor Testing Water Sensor Water OK Light on AutoSentry Board Should be ON When Wire is Grounded Wire to Water Sensor from Board Touch to Ground Copper Wire...
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Component Removal: Auger Component Removal: Auger • Begin by Removing the Chute Cover...
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Changes Changes Chute Insulation Changed to Foam Type Under-Chute Insulation Changed to Foam Type...
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Construction Construction Refrigerant Tube Evaporator Wall Insulation...
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Construction Construction • Gear Case Input Shaft – Change from lip seal to – a Labyrinth type Labyrinth Seal...
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Cleaning Cleaning • NEVER Pour Ice Machine Cleaner Directly into the Reservoir! – Mix it: 8 ounces to 3 quarts • Drain Reservoir & Evaporator – Unit OFF, pour cleaning mixture in reservoir – Soak for 15 minutes • Start machine & pour balance of cleaning mixture in the reservoir...
Service Diagnosis Service Diagnosis Symptom Probable Cause Possible Solution Does Not No Water Check Board for Lights and Start Reservoir for Water, Restore Water No Power Check Board for Lights Prior No Lights Check Transformer Current No Check Hi and Low Pressure Lights Cut Outs...
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Service Diagnosis Service Diagnosis Symptom Probable Cause Possible Solution Does Not Start Bin Controls Dirty Check Board for Bin Full or Empty Light Current: Bin Full Clean Bin Controls Light is OFF Prior: Bin Empty Light is ON...
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Service Diagnosis Service Diagnosis Symptom Probable Cause Possible Solution No Ice Auger Motor Will Not Check Service Light on Start AutoSentry Board Service Light Blinking Check Auger for Binding or Steady No Power to Auger Check relay Motor...
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Service Diagnosis Service Diagnosis Symptom Probable Cause Possible Solution Auger Motor Compressor OFF Check for Power to ON, No Ice Contactor Coil Check Compressor Prior models, check motor switch Compressor ON Check if auger is turning...
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Service Service • Motor and Gear Reducer Kits – Motor Only – or Gear Case with Gears & Oil – or Complete Case & Motor – or Individual Gears – or Case Cover with output shaft – or Case Bottom...
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Refrigeration Service Refrigeration Service 404A 404A Liquid Charge Liquid Charge HFC Leak Detectors HFC Leak Detectors Weigh In Charge Weigh In Charge Evacuate to 300 microns Use Nitrogen Purge Evacuate to 300 microns Use Nitrogen Purge...
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Summary Summary • Stainless steel augers, evaporators and bearing retainers • Photo-electric eye bin controls • Water level sensor • Double flight auger • Self-aligning top bearing – R-404A refrigerant...