Manitowoc Ice S1800 service manual Freeze Cycle Suction Pressure High Checklist

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Refrigeration System	Section 7

Freeze Cycle Suction Pressure High Checklist

Possible Cause	Check/Correct
Improper installation	See “Installation/Visual Inspection Checklist”
Discharge pressure	Discharge pressure is too high, and is affecting low side
	(See “Freeze Cycle Discharge Pressure High Checklist” )
Improper refrigerant charge	Overcharged
	Wrong type of refrigerant
Other	Non-Manitowoc components in system
	Harvest valve stuck open
	TXV flooding (check bulb mounting)
	Defective compressor

Freeze Cycle Suction Pressure Low Checklist

Possible Cause	Check/Correct
Improper installation	See “Installation/Visual Inspection Checklist”
Discharge pressure	Discharge pressure is too low, and is affecting low side
	(See “Freeze Cycle Discharge Pressure Low Checklist”)
Improper refrigerant charge	Undercharged
	Wrong type of refrigerant
Other	Non-Manitowoc components in system
	Improper water supply over evaporator (See “Water System Checklist” )
	Loss of heat transfer from tubing on back side of evaporator
	Restricted/plugged liquid line drier
	Restricted/plugged tubing in suction side of refrigeration system
	TXV starving

NOTE: Do not limit your diagnosis to only the items listed in the checklists.

7-14	Part Number 80-1634-3

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Contents Service Manual Read These Before Proceeding Personal Injury PotentialTable of Contents Section Before Calling For Service Table of Contents Section Ice Machine OperationSection Maintenance 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 StepSolution Type Water Mixed With Sanitizer Maintenance SectionSanitizing Procedure Removal of Parts for CLEANING/SANITIZING Solution Type Water Mixed WithIce Thickness Probe Removal Water CurtainWater Curtain Removal Ice Thickness Probe Water Distribution Tube Removal Water Distribution TubeWater Trough Water Pump Removal Water Level ProbeWater Pump Dump Valve Disassembly Water Dump ValveEvaporator Tray Removal Drain Line Check ValveWater Inlet Valve SELF-CONTAINED WATER-COOLED ICE Machines Maintenance Section Removal from Service/WinterizationPry Open the Water Regulating Valve AUCS→ Accessory Checklist Problem Possible Cause To CorrectBefore Calling For Service Section Safety Limit FeatureSELF-CONTAINED WATER-COOLED Models Energized Parts ChartsSection Electrical System SELF-CONTAINED Models Initial Start-Up or Start-Up After Automatic Shut-OffWater Purge Self-Contained Water PurgeSelf-Contained Refrigeration System Start-Up Refrigeration System Start Up 5 Seconds Toggle SwitchRefrigeration System START-UP Electrical System Section Freeze SequencePRE-CHILL Self-Contained Pre-Chill Self-Contained ModelsSelf-Contained Freeze Self-Contained Models Toggle Switch Bin Switch Control Board RelaysFreeze Harvest Sequence Harvest Self-Contained Automatic Shut-Off Automatic Shut-OffAutomatic 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 SeizedCompressor Start Sequence Ptcr DiagnosticsWhat is a PTCR? 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 CircuitryWait until the freeze cycle starts Problem Water Trough Overfilling During Freeze CycleDiagnosing Water Level Control Circuitry 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 minutesPossible Problem Corrective Action INSTALLATION/VISUAL Inspection ChecklistWater System Checklist Normal Ice Formation ICE Formation PatternExtremely Thin at Evaporator Outlet Extremely Thin at Evaporator Inlet No Ice FormationAnalyzing Why Safety Limits May Stop the Ice Machine Safety LimitsSafety Limit Indication 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 ChecklistFindings Comments Harvest Valve Temperature Check GeneralHarvest Valve Analysis 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 Number48 oz Total System Refrigerant ChargesSeries Version Charge S1800M 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