Scotsman CME306 Technical Training Manual
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Scotsman CME306 Technical Training Manual

Scotsman CME306 Technical Training Manual

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CME456

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Summary of Contents for Scotsman CME306

  • Page 1 CME306 and Technical Training Technical Training CME456...
  • Page 2 What ’ s In The Program What ’ s In The Program • Introduction to the Product • Installation & Application • How it Works • Service Diagnosis...
  • Page 3 Introduction Introduction • CME306 and CME456 – Modular Cubers • 115/60/1 • 230/50/1 – 22 Inch Wide Platform – Air Cooled has Cleanable Air Filter in Left Side Panel – CM Technology • AutoIQ Controller • Adaptive Harvest • Insulated Freezing Compartment...
  • Page 4 CME306 CME306 • Similar to the CME256 System – Single Evaporator – Air Cooled • One Fan • Major Differences: – Smaller Cabinet - 22” wide x 28” high x 24” deep – Purge Valve Reservoir Drain System – Smaller Fan Motor & Blade...
  • Page 5 CME456 • Similar to CME506 System – Two evaporators • Major Differences – Smaller Cabinet - same as CME306 – Purge Valve – Has 2 TXVs and 2 Check Valves • One for each evaporator – Compressor (RS55C2E) – Air Cooled •...

  • Page 6: Common Parts

    Common Parts Common Parts • Inlet Water Valve – Same as on SCE275 through CME806 • Fan Motors – CME306, CME456 same as SCE275 • TXVs – CME306, CME456 same as CME256 • Water Pump – CME306 same as CME256 •...
  • Page 7 – BH375 or SLB375 – BH260 or SLB260 w/new mounting bracket – HTB555 or HTB350 with KBT27 • On Motel Dispenser – HD150 – SD150 with KDT22 kit • On Ice and Beverage Dispensers – Scotsman & Booth – Lancer & Others...

  • Page 8: Installation

    Installation Installation Baffle • Air Cooled Install Vent on Reservoir Drain – Air flows in the left side and out the back. – All ship with air baffle for tight corner installations • Designed to prevent air recirculation from the condenser outlet to the air inlet...
  • Page 9 Optional Bin Thermostat Kit Optional Bin Thermostat Kit • Normal Ice Level Control is the Ice Sensor System – Fills Bin Very Full – Bins Without Baffles May Overfill • Add the Optional Thermostat Kit - KSTAT-22...
  • Page 10 Component Location: Front View Component Location: Front View Hi Voltage Box Evaporator Refrigeration System Cover Access Valves Water Pump Water Level Sensor Controller Reservoir...
  • Page 11 Component Location: CME306 Component Location: CME306 Internally Equalized Thermostatic Expansion Valve 16 Watt Fan Motor 1.25 GPM Inlet Water Valve...
  • Page 12 Component Location: CME456 Component Location: CME456 Two 16 Watt Fan Motors Two Internally Equalized TXVs and Two Check Valves...
  • Page 13 Under the Evaporator Cover Under the Evaporator Cover Upper Splash Panel Evaporator Bracket Lower Splash Panel...
  • Page 14 Under the Splash Panels Under the Splash Panels CME306 CME456 with with Upper and Upper Lower Splash Splash Panel Panels Removed Removed...
  • Page 15 CME456 CME456 Cascading Shield - Cube CME456 Only Deflector Front Right Evaporator Sensor - CME456 Mount Only Water Trough - CME456 Only...
  • Page 16 Lower Splash Panel Position Lower Splash Panel Position Lower Splash Panel Flange Must Be As Molded Shown - Bump Behind Molded Bump...
  • Page 17 PTCR PTCR Purge Valve Timer & PTCR Relay It’s Hot!
  • Page 18 PTCR PTCR • Positive Temperature Coefficient Resistor – Replaces Start Relay – Eliminates Start Capacitor – In Series with the Compressor Start Winding – Flows Full Current at Lower Temperature – Blocks Current Flow at Higher Temperature – Changes Temperature with Current Flow •...
  • Page 19 CME456 Refrigeration Schematic CME456 Refrigeration Schematic Evaporator Evaporator Check Check Valve Valve TXV Bulb Condenser TXV Bulb Suction Line Compressor Liquid Line Discharge Line...
  • Page 20 CME456 Refrigeration System CME456 Refrigeration System • Two TXVs Eliminates Distributor – Both Internally Equalized • Eliminates Low Side Connection – Check Valves Prevent Cross-Feeding During Freeze – If a TXV Bulb is on the Wrong Evaporator Outlet • One Evaporator Does Not Make Ice •...
  • Page 21 CME456 Refrigeration System CME456 Refrigeration System • Hot Gas Valve – Restrictor Tube used to Control Volume of Refrigerant Gas Cooled • Use allows common HGV Hot Gas between air and water Restrictor cooled while still having Tube different flow rates •...

  • Page 22: Water System

    Water System Water System • Similar to CME1056 and – Purge Valve Drain • 115 Volt Coil (red) – Inlet Water Valve Fill • 1.25 GPM valve – Same as SCE275, CME256, CME506, CME656, CME806...

  • Page 23: Control System

    Control System Control System • AutoIQ Controllers • Water Level Sensor – Common to All CM • Ice Sensor • Water Temp Sensor • Discharge Temp Sensor • Optional Bin Thermostat – For Specific Dispensers – For Bins Without Baffles (KSTAT-22)
  • Page 24 Controller Controller • Last Error Recall – Shut unit off – Hold Off button until Green lights appear – Push and release Harvest button to show last error code – Push and release Harvest button again to show second to last error code...

  • Page 25: Service Controller

    Service Controller Service Controller • Single Service Controller – For all existing models – Model selection table on back and in the instructions – Model selected by rotary switch...

  • Page 26: Water Level Sensor

    Water Level Sensor Water Level Sensor • The controller uses the water level sensor to Upper Eye sense changes in water quantity Lower Eye – Upper electric eye indicates when water falls – Lower electric eye indicates when water rises...
  • Page 27 So, How Does It Work? So, How Does It Work? • Pushing Freeze Starts the Unit – Purge Valve Opens – Pump Starts – Hot Gas Valve is Open – Purge Valve Closes – Inlet Water Valve Opens and Fills the Reservoir –...

  • Page 28: Freeze Cycle

    Freeze Cycle Freeze Cycle • CME306 - Single Evaporator – Freezing Continues Until Water Level Drops • Starts Harvest • CME456 - Two Evaporators – Freezing Continues Until Water Level Drops • Refills Reservoir • Second Drop of Water Level Starts Harvest Cycle •...

  • Page 29: Air Cooled

    Air Cooled Air Cooled • Fan(s) cycle On and Off if Discharge Temperature at 3 minutes into Freeze is below – CME306: 142 • On 12 seconds • Off 45 seconds – CME456: 125 • On 12 seconds • Off 20 seconds •...

  • Page 30: Harvest Cycle

    Harvest Cycle Harvest Cycle • Hot Gas Valve Opens – Purge Valve Relay is Triggered • Purge Valve Opens for 40 Seconds • Pump Stops • Fans Stop • Pump Restarts Depending Upon Purge Setting • Purge Valve Closes • Inlet Water Valve Opens - 22 Second Fill –...
  • Page 31 Harvest Cycle Harvest Cycle • Long Harvest Times at First Cycle and Shut Down • Plus Every 15th Cycle, Harvest Time is Extended – May be extended to any of 4 time periods, depending upon Discharge Temperature (at 3 minutes into the freeze cycle) •...
  • Page 32 Ice Sensing and Harvest Control Ice Sensing and Harvest Control Harvest Begins Harvest Begins Harvest Ends Harvest Ends Total Current Harvest Cycle Time Total Current Harvest Cycle Time (prior cycle actual + a % of actual) (prior cycle actual + a % of actual) Actual Time to Release Ice Actual Time to Release Ice Percent of Actual...
  • Page 33 Purge Adjustment Purge Adjustment • There are 5 levels – Maximum – Heavy – Standard - the factory setting – Moderate – Minimum • Number of green lights indicates purge level...
  • Page 34 Ice Sensor Access Ice Sensor Access • Front Sensor – Remove Lower Splash Panel – CME306 - • Push Sensor Out – CME456 - • Remove Water Trough • Remove Cascading Shield • Push Sensor Out...
  • Page 35 Ice Sensor Access Ice Sensor Access • Back Sensor Back Sensor – Remove Front Sensor First – Three Methods for the Back One • From The Front Only – Remove Cube Deflector • From The Front and Top – Remove Top Panel, Reach Down •...
  • Page 36 Back Sensor Back Sensor • Wire to Back Sensor Has Quick Connect in it – Can Unplug Back Sensor Without Unplugging it From the Controller • Wire Routes Under Right Side Panel – Excess Wire Tied Up by Compressor...

  • Page 37: Sanitation And Maintenance

    Sanitation and Maintenance Sanitation and Maintenance • Cube Deflector – Removal on CME456 • Remove Reservoir Cover • Rotate Deflector CW Until it Fits Between Evaporator Plates • Pull It Out...

  • Page 38: Cleaning And Sanitation

    Cleaning and Sanitation • Push Harvest to release any ice and warm up the evaporators • Push Clean and add 24 ounces of Scotsman Ice Machine Cleaner • After 10 minutes push Clean again to flush out the Cleaner •...

  • Page 39: Water Distributors

    Water Distributors Water Distributors Remove Water Distributors and Check Them - All Ports Must Be Open Evaporator Channels Must Be Open...
  • Page 40 Air Cooled Condenser Service Air Cooled Condenser Service • Fan Shroud Is Removable...

  • Page 41: Service Diagnosis

    Service Diagnosis Service Diagnosis • No ice, machine is off – Check the controller for lights • No lights = no power to controller – Check for power to machine – Check for transformer output...
  • Page 42 Service Diagnosis Service Diagnosis • If there are lights - which ones are on? – Off light means the machine was switched off by someone – A Diagnostic light means a machine malfunction – Bin Full light means something has triggered either •...
  • Page 43 Water Sensor Diagnostics Water Sensor Diagnostics Power Freeze Termination Water Fill Ground or Negative...
  • Page 44 Clean Water Sensor Lenses Clean Water Sensor Lenses Lenses Wipe lenses clean with a cotton swab - NOT A SCREWDRIVER!
  • Page 45 Service Diagnosis Service Diagnosis • Refrigeration Light – Blinks once and repeats • Ice release very slow, took maximum length harvest – Blinks twice and repeats • No ice sensed during maximum length harvest – Blinks three times and repeats •...
  • Page 46 Service Diagnosis Service Diagnosis • Refrigeration Light – Is ON without blinking • Low discharge temperature OR • Maximum length freeze cycle OR • Water cooled or remote may have cut out on high discharge pressure – Control resets automatically, but the controller may have timed out, depending upon when in the freeze cycle the control reset...
  • Page 47 Service Diagnosis Service Diagnosis • Bin Full light is ON – Bin may be full – 4 minute delay – Optional Thermostat may be closed - is bin very cold? – Ice sensors may be blocked • Could need cleaning...
  • Page 48 Ice Sensors Ice Sensors Clean Sensor Lenses with old soft toothbrush, NOT A SCREWDRIVER! Lens Ugly and Dirty! Clean Me! Good to Go! Note: Wet parts may appear clean, dry them to check.
  • Page 49 Ice Sensor Ice Sensor • Modular Cuber Sensor Holder – Two piece construction • Holder • Photo-eye module • Interchangeable with prior sensors Module...
  • Page 50 Ice Sensor Ice Sensor • Push in on front of sensor module to release it from the holder...
  • Page 51 Ice Sensor Ice Sensor • When sensor module is released, it can be easily cleaned with a soft cloth or swab Photo Eye Lens...
  • Page 52 Ice Sensor Ice Sensor • Re-assemble the sensor – Tuck wire under the clip – Push module into place – Be sure wire doesn’t stick out past edge of holder...
  • Page 53 Service Diagnosis Service Diagnosis • Unit is running but both Diagnostic lights are ON – Check if temperature sensor (thermistor) set is plugged into the controller Temperature – If it is, replace the temperature Sensor sensor set Connection – Thermistors can also be checked by putting either probe in ice water •...

  • Page 54: Cycle Times

    Cycle Times Cycle Times • CME306: – 12 to 13 minutes at 70/50 – 15 to 16 minutes at 90/70 • CME456 – 19 to 20 minutes at 70/50 – 24 to 25 minutes at 90/70 • Longer than normal times can be caused by –...
  • Page 55 Compressor Diagnostics Compressor Diagnostics • Electrical – Starting • Check starting components & windings • Check PTCR - but wait for it to cool! – HGV must be OPEN during start up or compressor will not start. Open HGV coil symptom may be compressor not starting –...
  • Page 56 Confirm inefficient compressor – Process of elimination • TXV, Charge, Valves (water, hot gas) more likely to be at fault • Amp draw may be low if cannot pump to capacity • Normal amps: – CME306 - 10 – CME456 - 13...

  • Page 57: Refrigeration Service

    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 Evacuate to 300 Use Nitrogen Purge Use Nitrogen Purge Microns Microns...
  • Page 58 Summary Summary • The CME306 is a single plate, 22” wide modular cuber • The CME456 is a two plate, 22” wide modular cuber • Both feature Scotsman’s CM Technology, which on these machines also includes – Purge Valve drain system...

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