Scotsman CME306 Technical Training Manual Download Page 55

Page: 55 / 58

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

– Overheating

•

TXV Superheat

•

Low Refrigerant Charge

•

Compressor Bearings

Summary of Contents for CME306

Page 1: ...Technical Training Technical Training CME306 and CME456 ...

Page 2: ...What What s In The Program s In The Program Introduction to the Product Installation Application How it Works Service Diagnosis ...

Page 3: ...roduction 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 CM3 Technology AutoIQ Controller Adaptive Harvest Insulated Freezing Compartment ...

Page 4: ...E306 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 Compressor RS43C2E ...

Page 5: ...6 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 Two fan motors and blades ...

Page 6: ...s 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 Same PTCR Benefit Lower Parts Inventory ...

Page 7: ...dular Bin 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 Benefit Wide Range of Applications ...

Page 8: ...ir Cooled 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 Install Vent on Reservoir Drain Baffle ...

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 Refrigeration System Access Valves Water Pump Controller Evaporator Cover Water Level Sensor 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 Lower Splash Panel Evaporator Bracket ...

Page 14: ...Under the Splash Panels Under the Splash Panels CME306 with Upper and Lower Splash Panels Removed CME456 with Upper Splash Panel Removed ...

Page 15: ...CME456 CME456 Water Trough CME456 Only Right Evaporator CME456 Only Cascading Shield CME456 Only Cube Deflector Front Ice Sensor Mount ...

Page 16: ...Lower Splash Panel Position Lower Splash Panel Position Lower Splash Panel Flange Must Be As Shown Behind Molded Bump Molded Bump ...

Page 17: ...PTCR PTCR PTCR Purge Valve Timer Relay It s Hot ...

Page 18: ... 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 Normal Operating Temperature is 180oF Must Cool Down to be able to Restart Compressor About 4 5 minutes of Off time ...

Page 19: ...CME456 Refrigeration Schematic CME456 Refrigeration Schematic Evaporator Evaporator Discharge Line TXV Bulb TXV Bulb TXV HGV Check Valve Check Valve Liquid Line Suction Line TXV Condenser Compressor ...

Page 20: ...rigeration 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 Why ...

Page 21: ...eration System Hot Gas Valve Restrictor Tube used to Control Volume of Refrigerant Gas Use allows common HGV between air and water cooled while still having different flow rates Air Cooled CME456 has a longer tube with 2 bends Water Cooled CME456s use a shorter tube with 1 bend ...

Page 22: ...Water System Water System Similar to CME1056 and Up Purge Valve Drain 115 Volt Coil red Inlet Water Valve Fill 1 25 GPM valve Same as SCE275 CME256 CME506 CME656 CME806 ...

Page 23: ...System Control System AutoIQ Controllers Water Level Sensor Common to All CM3 Ice Sensor Water Temp Sensor Discharge Temp Sensor Optional Bin Thermostat For Specific Dispensers For Bins Without Baffles KSTAT 22 ...

Page 24: ...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 Single Service Controller For all existing CM3 models Model selection table on back and in the instructions Model selected by rotary switch ...

Page 26: ...er uses the water level sensor to sense changes in water quantity Upper electric eye indicates when water falls Lower electric eye indicates when water rises Upper Eye Lower Eye Water Level Sensor Water Level Sensor ...

Page 27: ...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 When Reservoir is Full the Compressor Starts Hot Gas Valve Closes ...

Page 28: ... 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 Both Models Anti Slush Stops Pump for 30 Seconds Every Cycle ...

Page 29: ...Air Cooled Fan s cycle On and Off if Discharge Temperature at 3 minutes into Freeze is below CME306 142oF On 12 seconds Off 45 seconds CME456 125oF On 12 seconds Off 20 seconds Fan s shut off at the end of Freeze ...

Page 30: ...lve 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 Overlaps a Few Seconds with Purge Valve Open ...

Page 31: ...e Harvest Time is Extended May be extended to any of 4 time periods depending upon Discharge Temperature at 3 minutes into the freeze cycle 5 minutes when less than 158oF 4 minutes when more than 158 but less than 170 2 minutes when more than 170 but less than 187 100 seconds when more than 187oF ...

Page 32: ...nt 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 prior cycle prior cycle Percent of Actual Percent of Actual Last Cube Last Cube Fell Fell Ice Sensing and Harvest Control Ice Sensing and Harvest Control ...

Page 33: ... There are 5 levels Maximum Heavy Standard the factory setting Moderate Minimum Number of green lights indicates purge level Purge Adjustment Purge Adjustment ...

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: ...ove 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 From The Front and Back Push Back Sensor in From the Back Access Hole in Back Panel Back View Back Sensor ...

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

Page 38: ...ng 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 After 20 minutes push Off to stop ...

Page 39: ...Water Distributors Water Distributors Evaporator Channels Must Be Open Remove Water Distributors and Check Them All Ports Must Be Open ...

Page 40: ...Air Cooled Condenser Service Air Cooled Condenser Service Fan Shroud Is Removable ...

Page 41: ... 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 Service Diagnosis Service Diagnosis ...

Page 42: ... light means the machine was switched off by someone A Diagnostic light means a machine malfunction Bin Full light means something has triggered either the bin thermostat closed or the ice sensors are blocked Service Diagnosis Service Diagnosis ...

Page 43: ...Water Sensor Diagnostics Water Sensor Diagnostics Ground or Negative Power Water Fill Freeze Termination ...

Page 44: ...Clean Water Sensor Lenses Clean Water Sensor Lenses Lenses Wipe lenses clean with a cotton swab NOT A SCREWDRIVER ...

Page 45: ...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 High discharge temperature Service Diagnosis Service Diagnosis ...

Page 46: ...ture 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 Service Diagnosis Service Diagnosis ...

Page 47: ... 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 Service Diagnosis Service Diagnosis ...

Page 48: ...Ice Sensors Ice Sensors Ugly and Dirty Clean Me Good to Go Clean Sensor Lenses with old soft toothbrush NOT A SCREWDRIVER Lens Note Wet parts may appear clean dry them to check ...

Page 49: ...Ice Sensor Ice Sensor Modular Cuber Sensor Two piece construction Holder Photo eye module Interchangeable with prior sensors Module Holder ...

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: ... temperature sensor thermistor set is plugged into the controller If it is replace the temperature sensor set Thermistors can also be checked by putting either probe in ice water 32 649 ohms 32oF Service Diagnosis Service Diagnosis Temperature Sensor Connection ...

Page 54: ...06 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 Dirty condenser Low charge Leaky inlet water valve Inefficient compressor ...

Page 55: ...arting 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 Overheating TXV Superheat Low Refrigerant Charge Compressor Bearings ...

Page 56: ...tics Compressor Diagnostics 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: ... Charge Weigh In Charge Weigh In Charge Evacuate to 300 Evacuate to 300 Microns Microns Use Nitrogen Purge Use Nitrogen Purge HFC Leak Detectors HFC Leak Detectors R R 404A 404A Refrigeration Service Refrigeration Service ...

Page 58: ...ME306 is a single plate 22 wide modular cuber The CME456 is a two plate 22 wide modular cuber Both feature Scotsman s CM3 Technology which on these machines also includes Purge Valve drain system PTCR compressor start relay ...

Search results

Summary of Contents for CME306

Reviews:

Related manuals for CME306

Brands by name

Popular brands

Scotsman CME306, Technical Training Manual

Search results

Summary of Contents for CME306

Reviews:

Related manuals for CME306

Brands by name

Popular brands