Manitowoc MII 302 Spezifikationen

Technician’s HandbookThis manual is updated as new information and models are released. Visit our website for the latest manual. www.manitowocice.comA

10 Part Number STH038 5/12OperationControl Panel Features . . . . . . . . . . . . . . 37Buttons . . . . . . . . . . . . . . . . . . . . . . . . 37Di

98 Part Number STH038 5/12The following are the procedures for completing each step of the Freeze Cycle Refrigeration System Operational Analysis Tabl

Part Number STH038 5/12 99Before Beginning ServiceIce machines may experience operational problems only during certain times of the day or night. A ma

100 Part Number STH038 5/12Ice Production CheckThe amount of ice a machine produces directly relates to the operating water and air temperatures. This

Part Number STH038 5/12 101Weighing the ice is the only 100% accurate check. However, if the ice pattern is normal and the 3 mm bridge thickness is ma

102 Part Number STH038 5/12Installation/Visual Inspection ChecklistInadequate Clearances• Check all clearances on sides, back and top.Ice machine is n

Part Number STH038 5/12 103Water System ChecklistA water-related problem often causes the same symptoms as a refrigeration system component malfunctio

104 Part Number STH038 5/12Ice Formation PatternEvaporator ice formation pattern analysis is helpful in ice machine diagnostics.Analyzing the ice form

Part Number STH038 5/12 1052. Extremely Thin at Evaporator OutletThere is no ice, or a considerable lack of ice formation, at the outlet of the evapor

106 Part Number STH038 5/12Analyzing Discharge Temperature in the Freeze Cycle1. Determine the ice machine operating conditions:Air temp. entering con

Part Number STH038 5/12 107FREEZE CYCLE DISCHARGE TEMPERATUREHIGH CHECKLISTImproper Installation• Refer to “Installation/Visual Inspection Checklist”

Part Number STH038 5/12 11Energy Saver Menu . . . . . . . . . . . . . . . . . 56Ice Program . . . . . . . . . . . . . . . . . . . . . 57Water Miser

108 Part Number STH038 5/12FREEZE CYCLE DISCHARGE TEMPERATURELOW CHECKLISTImproper Installation• Refer to “Installation/Visual Inspection Checklist” (

Part Number STH038 5/12 109Analyzing Suction TemperatureThe suction temperature gradually drops throughout the freeze cycle. The actual suction temper

110 Part Number STH038 5/12Suction Temperature High ChecklistImproper Installation• Refer to “Installation/Visual Inspection Checklist” page 102Discha

Part Number STH038 5/12 111SUCTION TEMPERATURE LOW CHECKLISTImproper Installation• Refer to “Installation/Visual Inspection Checklist” (page 102)Disch

112 Part Number STH038 5/12Comparing Evaporator Inlet and Outlet TemperaturesThe temperatures of the suction line entering and leaving the evaporator

Part Number STH038 5/12 113Harvest Valve AnalysisSymptoms of a harvest valve remaining partially open during the freeze cycle can be similar to sympto

114 Part Number STH038 5/125. Record your findings on the table.Findings CommentsThe inlet of the harvest valve is cool enough to touch and the compre

Part Number STH038 5/12 115Discharge Line Temperature AnalysisGENERALKnowing if the discharge line temperature is increasing, decreasing or remaining

116 Part Number STH038 5/12Final Analysis The column with the highest number of Checkmarks identifies the refrigeration problem.COLUMN 1 - HARVEST VAL

Part Number STH038 5/12 117COLUMN 3 - TXV FLOODING OR REFRIGERANT OVERCHARGEA loose or improperly mounted expansion valve bulb causes the expansion va

12 Part Number STH038 5/12TroubleshootingSafety Limits . . . . . . . . . . . . . . . . . . . . . . 85Safety Limit #1 . . . . . . . . . . . . . . .

118 Part Number STH038 5/12SYMPTOM #3 HARVEST PROBLEMS Definition of a harvest problem; At the end of a 3.5 minute harvest cycle the slab of ice is st

Part Number STH038 5/12 119SYMPTOM #3 WILL NOT HARVEST, CUBES NOT MELTEDYESYESYESNONONOYESIce Machine Will Not Harvest - Freeze Cycle is Normal and Ic

120 Part Number STH038 5/12YESYESYESNONOSelf ContainedAir-cooled Condenser?Fan cyclingcontrol operates correctlyin freeze cycle?Fan cyclingcontrol ope

Part Number STH038 5/12 121SYMPTOM #4 WILL NOT HARVEST, CUBES MELTEDLevel Ice MachineRefer toDump ValveDiagnosticsIs water flowing over the evaporator

122 Part Number STH038 5/12Refer to Symptom #2 Freeze Cycle OperationalAnalysis TableRefer to Heavily ScaledCleaning ProcedureDischarge line temperatu

Part Number STH038 5/12 123Component Check ProceduresElectrical ComponentsCONTROL BOARD, DISPLAY BOARD AND TOUCH PADFUNCTIONThe control board, display

124 Part Number STH038 5/12Control Board Diagnostics1. Micro light is not flashing a heartbeat.2. Disconnect line voltage power supply to the ice mach

Part Number STH038 5/12 125Touch Pad DiagnosticsFollow the control board diagnostics to the Status Passed display. Perform the following keystrokes on

126 Part Number STH038 5/12CONTROL BOARD RELAY TESTThe control board can be set to energize all relays for 3.5 minutes. This allows testing to verify

Part Number STH038 5/12 1274. Test for line voltage at the individual components.A. Line voltage is present and the component is non functional - Repl

Part Number STH038 5/12 13Component Check ProceduresElectrical Components . . . . . . . . . . . . . . . 123Control Board, Display board and Touch Pad

128 Part Number STH038 5/12USB FLASH DRIVE SPECIFICATIONS AND FORMATTINGUpdating firmware on Indigo™ model ice machines requires a properly formatted

Part Number STH038 5/12 129Windows 7 or Windows Vista Computers:1. Insert USB flash drive; your computer may indicate:• “Found New Hardware” follow th

130 Part Number STH038 5/12Windows XP Computers:1. Insert USB flash drive; your computer may indicate:• “Found New Hardware” follow the prompts to ins

Part Number STH038 5/12 131UPGRADING FIRMWARE WITH A FLASH DRIVE OR TRANSFERRING SETUP DATA TO MULTIPLE MACHINES1. Refer to USB Flashdrive Specificati

132 Part Number STH038 5/1211. Follow these on-screen instructions to:A. Insert Drive (Insert the flash drive into the USB port on the ice machine’s c

Part Number STH038 5/12 133EXPORTING DATA TO A FLASH DRIVEData can be copied from the control board memory to a flash drive and used to transfer setup

134 Part Number STH038 5/127. Press the Checkmark again. A submenu with Export ALL and Export Setup appears.NOTE: There are four files stored in ice m

Part Number STH038 5/12 135PROGRAMMING A REPLACEMENT CONTROL BOARDIndigo™ replacement control boards require the Model and Serial number to be entered

136 Part Number STH038 5/12Manual Setup - Applicable when the control board is non-operational or data from the faulty board is suspect. Install repla

Part Number STH038 5/12 137MAIN FUSEFUNCTIONThe control board fuse stops ice machine operation if electrical components fail, causing high amp draw.SP

14 Part Number STH038 5/12ChartsCycle Times/24-Hour Ice Production/Charts I0320A Air-Cooled Model . . . . . . . . . . 168I0500A Air-Cooled Model . .

138 Part Number STH038 5/12BIN SWITCHFUNCTIONMovement of the water curtain/ice dampers control bin switch operation. The bin switch has two main funct

Part Number STH038 5/12 139SPECIFICATIONSThe bin switch is a magnetically operated reed switch. The magnet is attached to the lower right corner of th

140 Part Number STH038 5/12DIAGNOSTICS1. Verify bin switch, damper and damper magnet are in place.• Press the Menu button.• Scroll down to Service and

Part Number STH038 5/12 141WATER LEVEL CONTROL CIRCUITRYFUNCTIONThe water level probe controls the water level by sensing whether water is or is not c

142 Part Number STH038 5/12Freeze Cycle OperationDuring the Freeze cycle, the water inlet valve energizes and de-energizes in conjunction with the wat

Part Number STH038 5/12 143WATER TROUGH OVERFILLING DURING THE FREEZE CYCLEStep 1 Press the power button and turn off the ice machine.Step 2 If wa

144 Part Number STH038 5/12Step 6. Water level probe wires #2 & #3 jumpered at the control board connectorIs WaterFlowinginto theWaterTrough?TheWa

Part Number STH038 5/12 145WATER WILL NOT RUN INTO THE SUMP TROUGH DURING THE FREEZE CYCLEStep 1 Verify water is supplied to the ice machine.Step 2

146 Part Number STH038 5/12ICE THICKNESS PROBE (HARVEST INITIATION)FUNCTIONThe ice thickness probe senses ice on the evaporator and signals the contro

Part Number STH038 5/12 147Ice Thickness CheckThe ice thickness probe is factory-set to maintain the ice bridge thickness at 3 mm. NOTE: Make sure the

Part Number STH038 5/12 13General InformationHow to Read a Model NumberI Y 0855 W3 – 263PHPXICE MACHINE MODELI - Indigo ModelIB - Ice Beverage# CUBE

148 Part Number STH038 5/12DiagnosticsSYMPTOMSPremature harvest• Display indicates ITP Failure• Low ice production• Thin ice in bin• Freeze cycles are

Part Number STH038 5/12 149ICE MACHINE CYCLES INTO HARVEST BEFORE ICE CONTACTS THE ICE THICKNESS PROBE1. Reboot the control board by disconnecting and

150 Part Number STH038 5/12ICE MACHINE DOES NOT CYCLE INTO HARVESTIf ice is on the evaporator initiate a manual harvest cycle by performing the follow

Part Number STH038 5/12 151HIGH PRESSURE CUTOUT (HPCO) CONTROLFUNCTIONStops the ice machine if subjected to excessive high-side pressure. The HPCO con

152 Part Number STH038 5/12CHECK PROCEDURESymptom #1 Machine is off and the display indicates “Delay xx min, HPCO Active”.1. Leave all wiring connecto

Part Number STH038 5/12 153Symptom #2 Machine is running and the display indicates “HPC Fault” and an alert triangle1. Navigate to the event log on th

154 Part Number STH038 5/12FAN CYCLE CONTROLFUNCTIONCycles the fan motor on and off.The fan cycle control closes on an increase, and opens on a decrea

Part Number STH038 5/12 155THERMISTORSFUNCTIONThermistor resistance values change with temperature. The value supplied to the control board is used to

156 Part Number STH038 5/12Four thermistors are located on the ice machine. They are labeled T1, T2, T3, T4T1 - Air or Water cooled Models• Liquid lin

Part Number STH038 5/12 157Thermistor MatrixCo n d e n s in g O p t io nR404aEnt Evap[Evap In][Left]R404aLvg Evap[EvapOut][Right]R404aLvg Evap[EvapOut

14 Part Number STH038 5/12Model/Serial Number LocationThese numbers are required when requesting information from your local Manitowoc Distributor, se

158 Part Number STH038 5/12SYMPTOMAlert icon on the display is flashing and the alert indicates a T1, T2, T3, or T4 Fault.CHECK PROCEDURE• Press the M

Part Number STH038 5/12 159HARVEST ASSIST AIR PUMPFUNCTIONThe air pump breaks the vacuum between the sheet of ice and the evaporator which results in

160 Part Number STH038 5/12COMPRESSOR ELECTRICAL DIAGNOSTICSThe compressor does not start or will trip repeatedly on overload.Check Resistance (Ohm) V

Part Number STH038 5/12 161CHECK MOTOR WINDINGS TO GROUNDCheck continuity between all three terminals and the compressor shell or copper refrigeration

162 Part Number STH038 5/12DIAGNOSING START COMPONENTSIf the compressor attempts to start, or hums and trips the overload protector, check the start c

Part Number STH038 5/12 163RelayThe relay has a set of contacts that connect and disconnect the start capacitor from the compressor start winding. The

164 Part Number STH038 5/12PTCRThe PTCR allows current to flow through the start winding at compressor startup. Current flow heats the ceramic discs i

Part Number STH038 5/12 165PTCR Operation Check1. Visually inspect the PTCR. Check for signs of physical damage.NOTE: The PTCR case temperature may re

166 Part Number STH038 5/12REFRIGERANT RECOVERY/EVACUATION/CHARGING PROCEDURESRequirements and procedures vary by location. Follow your local laws gov

Part Number STH038 5/12 167ChartsCycle Times/24-Hour Ice Production/ChartsThese charts are used as guidelines to verify correct ice machine operation.

Part Number STH038 5/12 15COMMERCIAL WARRANTY COVERAGEManitowoc Ice, (hereinafter referred to as the "COMPANY") warrants for a period of thi

168 Part Number STH038 5/12I0320A AIR-COOLED MODELCYCLE TIMESFreeze Time + Harvest Time = Total Cycle Time24 HOUR ICE PRODUCTIONOPERATING TEMPERATURES

Part Number STH038 5/12 16921°C Water Temperature 32°C Water Temperature Air TempEnteringCondenser°F/°CFreeze Cycle Harvest CycleDischarge TempT2Sucti

170 Part Number STH038 5/12I0500A AIR-COOLED MODELCYCLE TIMESFreeze Time + Harvest Time = Total Cycle Time24 HOUR ICE PRODUCTIONOPERATING TEMPERATURES

Part Number STH038 5/12 17121°C Water Temperature 32°C Water Temperature Air TempEnteringCondenser°F/°CFreeze Cycle Harvest CycleDischarge TempT2Sucti

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Part Number STH038 5/12 173DiagramsWiring DiagramsThe following pages contain electrical wiring diagrams. Be sure you are referring to the correct dia

174 Part Number STH038 5/12I0320Self Contained - 1 Ph

Part Number STH038 5/12 175I0500Self Contained - 1 Ph

176 Part Number STH038 5/12Electronic Control BoardRT HarvestCompressorLT HarvestPumpWaterDumpDisplay LightMicro LightClean LightHarvest LightSL-1 Lig

Part Number STH038 5/12 177Refrigeration Tubing SchematicsXRECEIVER (WATER COOLED ONLY)DRIERCOMPRESSORSTRAINERCONDENSERAIR OR WATERHOT GAS SOLENOID VA

16 Part Number STH038 5/12Additional expenses including without limitation, travel time, overtime premium, material cost, accessing or removal of the

178 Part Number STH038 5/12

Manitowoc Ice2110 South 26th Street, P.O. Box 1720Manitowoc, WI 54221-1720, USAPh: 001-920-682-0161 Fax: 001-920-683-7589Visit us online at: www.mani

Part Number STH038 5/12 17THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES OR GUARANTEES OF ANYKIND, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRA

Safety NoticesAs you work on Manitowoc equipment, be sure to pay close attention to the safety notices in this handbook. Disregarding the notices may

18 Part Number STH038 5/12This Page Intentionally Left Blank

Part Number STH038 5/12 19Installation!CautionThe ice machine head section must be protectedif it will be subjected to temperatures below 0°C(32°F). F

20 Part Number STH038 5/12Location of Ice MachineThe location selected for the ice machine must meet the following criteria. If any of these criteria

Part Number STH038 5/12 21Clearance RequirementsIce Machine Heat of RejectionI0320 Self-Contained Air-CooledTop/Sides 305 mmBack 127 mm I0500Self-Cont

22 Part Number STH038 5/12ICE DEFLECTORINSTALLATION ON A BINAn ice deflector is required for all bin installations and is included with all Manitowoc

Part Number STH038 5/12 23Electrical RequirementsVoltageThe maximum allowable voltage variation is +10/-0% of the rated voltage on the ice machine mod

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Part Number STH038 5/12 25MaintenanceCleaning and SanitizingGENERALYou are responsible for maintaining the ice machine in accordance with the instruct

26 Part Number STH038 5/12!CautionUse only Manitowoc approved Ice MachineCleaner and Sanitizer for this application(Manitowoc Cleaner part number 94-0

Part Number STH038 5/12 27CLEANING/SANITIZING PROCEDUREThis procedure must be performed a minimum of once every six months.• The ice machine and bin m

Procedural NoticesAs you work on Manitowoc equipment, be sure to read the procedural notices in this handbook. These notices supply helpful informatio

28 Part Number STH038 5/12Cleaning / Sanitizing ProcedureCLEANING PROCEDUREIce machine cleaner is used to remove lime scale and mineral deposits. Ice

Part Number STH038 5/12 29Step 1 Open the front door to access the evaporator compartment. Ice must not be on the evaporator during the clean/saniti

30 Part Number STH038 5/12Step 4 Wait until the clean cycle is complete (approximately 24 minutes). Then disconnect power to the ice machine (and di

Part Number STH038 5/12 31C. Remove the water level probe• Pull the water level probe straight down to disengage.• Lower the water level probe until t

32 Part Number STH038 5/12Step 6 Disassemble distribution tube by loosening the two (2) middle thumbscrews and dividing. Mix a solution of cleaner a

Part Number STH038 5/12 33Step 8 While components are soaking, use 1/2 of the cleaner/water solution to clean all food zone surfaces of the ice mach

34 Part Number STH038 5/12Step 11 Use 1/2 of the sanitizer/water solution to sanitize all food zone surfaces of the ice machine and bin (or dispense

Part Number STH038 5/12 35Ice Thickness Probe & Water Level ProbeClean the probes using the following procedure.1. Mix a solution of Manitowoc ice

36 Part Number STH038 5/12Removal from Service/WinterizationGeneralSpecial precautions must be taken if the ice machine is to be removed from service

Part Number STH038 5/12 37OperationControl Panel FeaturesThe control panel offers a series of pressure sensitive buttons and a four-line interactive d

Read These Before Proceeding:!CautionProper installation, care and maintenance areessential for maximum performance and trouble-free operation of your

38 Part Number STH038 5/12Menu Button: Moves the display from the Home Screen, where ice machine status, alerts and messages are viewed, to the Main M

Part Number STH038 5/12 39Menu Navigation OverviewOn/OffButtonMenu Navigation OverviewHome ScreenWhen Alert PresentWhen Message PresentAlerts MenuMess

40 Part Number STH038 5/12Display Panel NavigationHighlights: Brackets indicate if a line on the screen is “highlighted” or actionable. Move the brack

Part Number STH038 5/12 41Cursor: A cursor (underline) is used within lines where actual settings can be adjusted. In these screens, use the Up and Do

42 Part Number STH038 5/12Alerts and MessagesWhen messages and alerts exist, they will be highlighted and can be selected with the Left arrow. Alerts

Part Number STH038 5/12 43Main MenuMain MenuFrom the Home screen, press the Menu button to enter the Main menu, where you can choose to see machine in

44 Part Number STH038 5/12Machine Info MenuFrom the Main menu, ensure that Machine Info is highlighted and press the Checkmark to view a list includin

Part Number STH038 5/12 45Password Entry A password is not required, although a password can be turned on to prevent unauthorized control setting modi

46 Part Number STH038 5/12To enter a four digit password of your choosing use the following procedure.1. Press the Menu button. 2. From the Main menu,

Part Number STH038 5/12 47RESET PASSWORD TO FACTORY DEFAULTSThe password can be reset to the factory defaults when required. The default factory passw

! WarningDo not use electrical appliances or accessoriesother than those supplied by Manitowoc for your icemachine model.!WarningTwo or more people or

48 Part Number STH038 5/12Set-Up MenuFrom the Main menu, use the Down arrow to navigate to Set-Up and press the Checkmark. Select and customize machin

Part Number STH038 5/12 494. Press the Checkmark. The date will appear on the first line of the display (Mo/Day/Yr) and the time will appear on the se

50 Part Number STH038 5/12TIME CONFIGURATION1. From the Set-Up menu, use the Down arrow to highlight Time Config.2. Press the Checkmark. On this scree

Part Number STH038 5/12 51ICE CLARITYIn areas with poor potable water quality, the ice machine makes cloudy ice. Setting Ice Clarity to ON will add ad

52 Part Number STH038 5/12PASSWORD ONA password can be added to prevent unauthorized changes to ice machine settings.1. From the Set-Up menu, use the

Part Number STH038 5/12 53IAUCS RUNTIMEAutomatic Cleaning System is an optional accessory and will perform a cleaning cycle at a set time interval. 1.

54 Part Number STH038 5/12WATER FILTERThe ice machine has a feature that displays a replace water filter reminder at a set time interval.1. From the S

Part Number STH038 5/12 55USB SETUPRefer to “Upgrading Firmware with a Flash Drive” and “Exporting Data to a Flash Drive” for more information on this

56 Part Number STH038 5/12Energy Saver MenuFrom the Main menu, use the Down arrow to navigate to Energy Saver and press the Checkmark. Set up an energ

Part Number STH038 5/12 57ICE PROGRAMTo save energy and water, the ice machine can be programmed to only power up during time periods that the ice wil

! WarningDo not operate equipment that has been misused,abused, neglected, damaged, or altered/modifiedfrom that of original manufactured specificatio

58 Part Number STH038 5/12WATER MISERWater Miser is a feature that reduces water usage by eliminating flush cycles. Enabling this feature is only reco

Part Number STH038 5/12 59Service MenuFrom the Main menu, use the Down arrow to navigate to Service and press the Checkmark. This menu is intended for

60 Part Number STH038 5/12ServiceData HistoryDiagnosticsReal Time DataManual HarvestRepl Cnt BdUSB SetupCurrent DayCurrent Day -1Current Day -2Curre

Part Number STH038 5/12 61DATA HISTORYPress the Checkmark with Data History highlighted to view a list of eight-digit dates (Current, Current + 1 ...

62 Part Number STH038 5/12REAL TIME DATAPress the Checkmark with Real Time Data highlighted to get readings on Time & Temp, Inputs and Outputs (be

Part Number STH038 5/12 63Outputs• Status Off/On - Displays stage of cycle• Water Pump Off/On• Hot Gas Valve 1 Off/On• Hot Gas Valve 2 Off/On• Air Pum

64 Part Number STH038 5/12DIAGNOSTICSPress the Checkmark with Diagnostics highlighted to enter screens where you can run diagnostics on the control bo

Part Number STH038 5/12 65MANUAL HARVESTPress the Checkmark with Manual Harvest highlighted to initiate a manual harvest.Manual Harvest• Harvest Start

66 Part Number STH038 5/12EVENT LOG MENUFrom the Service menu, use the Down arrow to navigate to Event Log and press the Checkmark. Ensure View ELog i

Part Number STH038 5/12 67EVENT LOGRefer to the following table for Event Code descriptions.Code DescriptionE01 Long Freeze CycleE02 Long Harvest Cycl

! WarningIt is the responsibility of the equipment owner toperform a Personal Protective Equipment HazardAssessment to ensure adequate protectiondurin

68 Part Number STH038 5/12Event Log DetailE-Log Display Text Error DescriptionDefinitionE01Long FreezeLong Freeze6 consecutive 60 Minute Freeze cycles

Part Number STH038 5/12 69E11Refig FaultRefrigeration System (Refrig Fault)The compressor discharge temperature did not increase by at least 10 F, and

70 Part Number STH038 5/12E21T1 FaultT1 SensorEach thermistor reading is monitored continuously using six second average values. During Pre-chill a th

Part Number STH038 5/12 71USB FLASH DRIVE SPECIFICATIONS AND FORMATTINGUpdating firmware on Indigo™ model ice machines requires a properly formatted 2

72 Part Number STH038 5/12Windows XP Computers:1. Insert USB flash drive; your computer may indicate:• “Found New Hardware” follow the prompts to inst

Part Number STH038 5/12 73UPGRADING FIRMWARE WITH A FLASH DRIVE OR TRANSFERRING SETUP DATA TO MULTIPLE MACHINES1. Drag and drop the files from your em

74 Part Number STH038 5/12Control Board10. Follow the on-screen instructions:A. Insert Drive (Insert the flash drive into the USB port on the ice mach

Part Number STH038 5/12 75EXPORTING DATA TO A FLASH DRIVEData can be copied from the control board memory to a flash drive and used to transfer setup

76 Part Number STH038 5/12Select only “Ice Machine Settings” file when multiple machines will be programmed with the same user specified settings. Sel

Part Number STH038 5/12 77Operational ChecksGENERALManitowoc ice machines are factory-operated and adjusted before shipment. Normally, new installatio

! WarningWhen using electric appliances, basicprecautions must always be followed, includingthe following:a. Read all the instructions before using th

78 Part Number STH038 5/12ICE THICKNESS CHECKAfter a harvest cycle, inspect the ice cubes in the ice storage bin. The ice thickness probe is factory-s

Part Number STH038 5/12 79Sequence of Operation SELF CONTAINED AIR OR WATER COOLEDNOTE: The power button must be depressed and the water curtain/ice d

80 Part Number STH038 5/12Freeze Sequence3. PrechillThe compressor lowers the temperature of the evaporator(s) before the water pump is energized. The

Part Number STH038 5/12 81Automatic Shut-Off7. Automatic Shut-OffWhen the storage bin is full at the end of a harvest sequence, the sheet of cubes fai

82 Part Number STH038 5/12 Single Evaporator ModelsEnergized Parts Chart Ice MakingSequence ofOperationWaterPumpHarvestValve(s)Air Pump(s)*Water Inlet

Part Number STH038 5/12 83Harvest Sequence5. Water PurgeOn On On Off On On OnMay CycleOn/OffFactorySet at 45 Seconds6. HarvestOff On On Off Off On OnM

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Part Number STH038 5/12 85TroubleshootingSafety LimitsIn addition to standard safety controls, the control board has built in safety limit controls wh

86 Part Number STH038 5/12SAFETY LIMIT #1Freeze time exceeds 60 minutes for 6 consecutive freeze cycles.Possible cause listWater System• Loss of water

Part Number STH038 5/12 87SAFETY LIMIT #2Harvest time exceeds 3.5 minutes for 500 consecutive harvest cyclesPossible Cause ChecklistImproper Installat

Part Number STH038 5/12 9Table of ContentsGeneral InformationHow to Read a Model Number . . . . . . . . . 13Model/Serial Number Location . . . . . .

88 Part Number STH038 5/12Troubleshooting By SymptomThe troubleshooting procedures follow flow charts. There are four symptoms, the symptom that you a

Part Number STH038 5/12 89Reset To Factory DefaultsBefore starting troubleshooting procedures, reset the control board to factory defaults to prevent

90 Part Number STH038 5/12SYMPTOM #1 ICE MACHINE WILL NOT RUNMicro light flashing heartbeat?YesNoSTARTIs the display interface energized and functioni

Part Number STH038 5/12 91Bin switch light on?(Multi evap all lights on?)Control board fuse is good?YesYesNoYesDisplay lightflashingheartbeat?NoInstal

92 Part Number STH038 5/12SL1SL2Press power button to start ice making, does safety limit light flash?Is magnet on the water curtain/damperYesReplace

Part Number STH038 5/12 93Diagnosing an Ice Machine That Will Not Run1. Verify primary voltage is supplied to ice machine and the fuse/circuit breaker

94 Part Number STH038 5/12SYMPTOM #2 LOW PRODUCTION, LONG FREEZEIce Machine has a Long Freeze Cycle. Ice Formation is Thick or Thin on Top or Bottom o

Part Number STH038 5/12 95PROCEDUREStep 1 Complete the “Operation Analysis” column.Read down the left “Operational Analysis” column. Perform all pro

96 Part Number STH038 5/12SYMPTOM #2 - FREEZE CYCLE REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLESSINGLE EXPANSION VALVE SELF CONTAINED AIR and WATE

Part Number STH038 5/12 97Suction Line Temperature 3 minutes into the freeze cycleNormal or High Normal or High Low Normal or HighFreeze Cycle Suction