Manitowoc Ice S1800 service manual Safety Limit Notes, Possible Cause Check/Correct

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Refrigeration System	Section 7

Safety Limit #1

Refer to previous page for safety limit operation.

Freeze time exceeds 60 minutes for 6 consecutive freeze cycles.

Possible Cause	Check/Correct
Improper installation	See “Installation/Visual Inspection Checklist”
Water system	Low water pressure [20 psi (138 kPa) min.]
	High water pressure [80 psi (552 kPa) max.]
	High water temperature (90°F/32.2°C max.)
	Clogged water distribution tube
	Dirty/defective water fill valve
	Dirty/defective water dump valve
	Defective water pump
	Loss of water from sump area
Electrical system	Low incoming voltage
	Ice thickness probe out of adjustment
	Harvest cycle not initiated electrically
	Contactor not energizing
	Compressor electrically non-operational
Miscellaneous	Restricted condenser airflow
	High inlet air temperature (Self-Contained -110°F/43.3°C max.;
	Remote - 120°F/49°C max.)
	Condenser discharge air recirculation
	Dirty condenser filter
	Dirty condenser
	Restricted condenser water flow
	Low water pressure [20 psi (138 kPa) min.]
	High water temperature (90°F/32.2°C max.)
	Dirty/defective water regulating valve
	Water regulating valve out of adjustment
Refrigeration system	Improper refrigerant charge
	Non-Manitowoc components
	Defective harvest valve
	Defective compressor
	TXV starving or flooding (check bulb mounting)
	Non-condensables in refrigeration system
	Plugged or restricted high side refrigerant lines or component

SAFETY LIMIT NOTES

•Because there are many possible external problems, do not limit your diagnosis to only the items listed in this chart.

•A continuous run of 100 harvests automatically erases the safety limit code.

•The control board will store and indicate only one safety limit – the last one exceeded.

•If the toggle switch is moved to the OFF position and then back to the ICE position prior to reaching the 100-harvest point, the last safety limit exceeded will be indicated.

•If a Safety Limit light did not flash prior to the ice machine restarting, then the ice machine did not stop because it exceeded a safety limit.

7-10	Part Number 80-1634-3

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Contents Service Manual Read These Before Proceeding Personal Injury PotentialTable of Contents Section Maintenance Table of Contents Section Ice Machine OperationSection Before Calling For Service Table of Contents Section Electrical System Section Refrigeration SystemTable of Contents How to Read a Model Number Model NumbersIce Cube Sizes Self-Contained Water-CooledGeneral Information Section Accessories Section General Information Model/Serial Number Location Model/Serial Number LocationWarranty Coverage Ice Machine Dimensions Width, Depth, and Height DimensionsElectrical and AuCS Dimensions GeneralInstallation Instructions Section Location of Ice Machine Ice Machine Heat of RejectionS1800M Water-Cooled Series Heat of Rejection Ice Machine Air ConditioningSection Installation Instructions Electrical Service VoltageMinimum Circuit Ampacity Electrical RequirementsFor United Kingdom Only Self Contained ICE Machine 115/1/60 or 208-230/1/60Self Contained ICE Machine 208-230/3/60 Self Contained ICE Machine 230/1/50Cooling Tower Applications Water SupplyWater Inlet Lines Drain ConnectionsInstallation Instructions Section Typical Water Supply Drain InstallationWater Supply and Drain Line SIZING/CONNECTIONS CondenserSection Installation Instructions Installation Check List AuCS Automatic Cleaning System Potential Personal Injury SituationSection Ice Machine Operation Component IdentificationIce Machine Operation Section Sequence Of Operation Initial START-UP or START-UP After Automatic SHUT-OFFSafety Timers Harvest Sequence 5. Water PurgeHarvest Automatic SHUT-OFF 7. Automatic Shut-OffIce Machine Operation Section Operational Checks Water LevelICE Thickness Check Ice Thickness CheckWater Purge Adjustment Harvest Sequence Water PurgeIce Machine Operation Section This page Intentionally Left BlankExterior Cleaning Ice Machine InspectionWater-Cooled Condenser Water Regulating Valve AlphaSan→Maintenance Section Guardian InstallationSachet Replacement Frequency Sachet Replacement ProcedureSection Maintenance Interior Cleaning and Sanitizing Cleaning ProcedureModel Amount of Cleaner StepSanitizing Procedure Maintenance SectionSolution Type Water Mixed With Sanitizer Removal of Parts for CLEANING/SANITIZING Solution Type Water Mixed WithWater Curtain Removal Ice Thickness Probe Water CurtainIce Thickness Probe Removal Water Trough Water Distribution TubeWater Distribution Tube Removal Water Pump Water Level ProbeWater Pump Removal Dump Valve Disassembly Water Dump ValveEvaporator Tray Removal Drain Line Check ValveWater Inlet Valve Pry Open the Water Regulating Valve AUCS→ Accessory Maintenance Section Removal from Service/WinterizationSELF-CONTAINED WATER-COOLED ICE Machines Checklist Problem Possible Cause To CorrectBefore Calling For Service Section Safety Limit FeatureSection Electrical System Energized Parts ChartsSELF-CONTAINED WATER-COOLED Models SELF-CONTAINED Models Initial Start-Up or Start-Up After Automatic Shut-OffWater Purge Self-Contained Water PurgeRefrigeration System START-UP Refrigeration System Start Up 5 Seconds Toggle SwitchSelf-Contained Refrigeration System Start-Up Electrical System Section Freeze SequencePRE-CHILL Self-Contained Pre-Chill Self-Contained ModelsFreeze Toggle Switch Bin Switch Control Board RelaysSelf-Contained Freeze Self-Contained Models Harvest Sequence Harvest Automatic SHUT-OFF Automatic Shut-OffSelf-Contained Automatic Shut-Off Section Electrical System Wiring Diagrams Wiring Diagram LegendS1800 SELF-CONTAINED 1 Phase Control BoardS1800 SELF-CONTAINED 3 Phase Specifications Check ProcedureBIN Switch Main FuseSymptoms Diagnostic AidsContinuity Test Water Curtain Removal NotesCompressor Electrical Diagnostics Check Resistance Ohm ValuesCheck Motor Windings to Ground Determine if the Compressor is SeizedWhat is a PTCR? Ptcr DiagnosticsCompressor Start Sequence Troubleshooting PTCR’s WHY a Good Ptcr MAY Fail To Start the CompressorModel Automatic Shut-Off and Restart During Start-Up First .25 1.0 SecondsChecking the Ptcr Manitowoc PtcrModel Manitowoc Cera-Mite Room Part NumberDiagnosing Start Components CapacitorRelay Relay Operation CheckICE/OFF/CLEAN Toggle Switch Switch Setting Terminals Ohm ReadingElectronic Control Board Control BoardSafety Limits InputsFreeze Time LOCK-IN Feature Ice Thickness Probe CleaningHOW the Probe Works Harvest LightDiagnosing ICE Thickness Control Circuitry Monitoring of Harvest Light CorrectionWater Inlet Valve Safety SHUT-OFF Electrical System Section Water Level Control CircuitryWater Level Probe Light Freeze Cycle CircuitryDiagnosing Water Level Control Circuitry Problem Water Trough Overfilling During Freeze CycleWait until the freeze cycle starts On or OFF Step Check Self Contained 1 Phase with Terminal Board SELF-CONTAINED Water -COOLED Models Freeze Cycle Refrigeration SequenceRefrigeration System Section S1800 SELF-CONTAINED Tubing Schematic General Before Beginning Service Weights are in poundsICE Production Check Times are in minutesWater System Checklist INSTALLATION/VISUAL Inspection ChecklistPossible Problem Corrective Action Extremely Thin at Evaporator Outlet ICE Formation PatternNormal Ice Formation Extremely Thin at Evaporator Inlet No Ice FormationSafety Limit Indication Safety LimitsAnalyzing Why Safety Limits May Stop the Ice Machine Safety Limit Notes Possible Cause Check/CorrectSection Refrigeration System Procedure Freeze Cycle Discharge Pressure High ChecklistFreeze Cycle Discharge Pressure Low Checklist Analyzing Discharge Pressure During Freeze or Harvest CycleStep Example Using SY1004A Model Ice Machine Analyzing Suction Pressure During Freeze CycleFreeze Cycle Suction Pressure High Checklist Freeze Cycle Suction Pressure Low ChecklistHarvest Valve Analysis Harvest Valve Temperature Check GeneralFindings Comments Discharge Line Temperature Analysis General Final Analysis Column 1 Harvest Valve LeakingColumn 2 LOW CHARGE/TXV Starving Column 3 TXV FloodingRefrigeration System Operational Analysis Tables Models Dual Expansion Valve Ice Machine Model NumberHigh Pressure CUT-OUT Hpco Control S1800 Series Self-Contained Water-Cooled Cycle TimesHour Ice Production Operating PressuresSELF-CONTAINED RECOVERY/EVACUATION ConnectionsSelf-Contained Charging Procedures Charging ConnectionsSystem Contamination CLEAN-UP Determining Severity Of ContaminationMild System Contamination Cleanup Procedure Severe System Contamination Cleanup ProcedureSection Refrigeration System 10. Using Pinch-Off Tool FILTER-DRIERS Drier End Part Model Connection Size NumberSeries Version Charge S1800M Total System Refrigerant Charges48 oz Recover New Product SpecificationsRefrigerant Definitions RecycleRecovered or Recycled Refrigerant Refrigerant RE-USE PolicyNew Refrigerant Reclaimed RefrigerantHFC Refrigerant Questions and Answers This page Intentionally Left Blank Page Attend a Manitowoc Factory Service School