SELF-CONTAINED Water -COOLED Models

Section 7	Refrigeration System

Section 7 Refrigeration System

Sequence of Operation

EVAPORATOR

HEAT

EXCHANGER

EXPANSION VALVE

HOT GAS SOLENOID VALVE

COMPRESSOR

AIR OR WATER

STRAINERCONDENSER

DRIER

RECEIVER

(WATER COOLED ONLY)

HIGH PRESSURE VAPOR	HIGH PRESSURE LIQUID	LOW PRESSURE LIQUID	LOW PRESSURE VAPOR
			SV1569

Figure 7-1. Self-Contained Prechill and Freeze Cycle

Prechill Refrigeration Sequence

No water flows over the evaporator during the prechill. The refrigerant absorbs heat (picked up during the harvest cycle) from the evaporator. The suction pressure decreases during the prechill.

Freeze Cycle Refrigeration Sequence

The refrigerant absorbs heat from water running over the evaporator surface. The suction pressure gradually drops as ice forms.

Part Number 80-1634-3

7-1

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Manitowoc Ice S1800 service manual SELF-CONTAINED Water -COOLED Models, Freeze Cycle Refrigeration Sequence

Contents

Service Manual Personal Injury Potential Read These Before Proceeding Table of Contents Section Maintenance Table of Contents Section Ice Machine OperationSection Before Calling For Service Section Refrigeration System Table of Contents Section Electrical System Table of Contents Self-Contained Water-Cooled How to Read a Model NumberModel Numbers Ice Cube Sizes General Information Section Accessories Model/Serial Number Location Section General Information Model/Serial Number Location Warranty Coverage General Ice Machine DimensionsWidth, Depth, and Height Dimensions Electrical and AuCS Dimensions Series Heat of Rejection Ice Machine Air Conditioning Installation Instructions Section Location of Ice MachineIce Machine Heat of Rejection S1800M Water-Cooled Electrical Requirements Section Installation Instructions Electrical ServiceVoltage Minimum Circuit Ampacity Self Contained ICE Machine 230/1/50 For United Kingdom OnlySelf Contained ICE Machine 115/1/60 or 208-230/1/60 Self Contained ICE Machine 208-230/3/60 Drain Connections Cooling Tower ApplicationsWater Supply Water Inlet Lines Condenser Installation Instructions SectionTypical Water Supply Drain Installation Water Supply and Drain Line SIZING/CONNECTIONS Section Installation Instructions Installation Check List Potential Personal Injury Situation AuCS Automatic Cleaning System Component Identification Section Ice Machine Operation Initial START-UP or START-UP After Automatic SHUT-OFF Ice Machine Operation Section Sequence Of Operation Automatic SHUT-OFF 7. Automatic Shut-Off Safety TimersHarvest Sequence 5. Water Purge Harvest Ice Thickness Check Ice Machine Operation Section Operational ChecksWater Level ICE Thickness Check Harvest Sequence Water Purge Water Purge Adjustment This page Intentionally Left Blank Ice Machine Operation Section AlphaSan→ Exterior CleaningIce Machine Inspection Water-Cooled Condenser Water Regulating Valve Sachet Replacement Procedure Maintenance Section GuardianInstallation Sachet Replacement Frequency Step Section Maintenance Interior Cleaning and SanitizingCleaning Procedure Model Amount of Cleaner Sanitizing Procedure Maintenance SectionSolution Type Water Mixed With Sanitizer Solution Type Water Mixed With Removal of Parts for CLEANING/SANITIZING Water 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 Water Dump Valve Dump Valve Disassembly Drain Line Check Valve Evaporator Tray Removal Water Inlet Valve Pry Open the Water Regulating Valve AUCS→ Accessory Maintenance Section Removal from Service/WinterizationSELF-CONTAINED WATER-COOLED ICE Machines Problem Possible Cause To Correct Checklist Safety Limit Feature Before Calling For Service Section Section Electrical System Energized Parts ChartsSELF-CONTAINED WATER-COOLED Models Self-Contained Water Purge SELF-CONTAINED ModelsInitial Start-Up or Start-Up After Automatic Shut-Off Water Purge Refrigeration System START-UP Refrigeration System Start Up 5 Seconds Toggle SwitchSelf-Contained Refrigeration System Start-Up Self-Contained Pre-Chill Self-Contained Models Electrical System SectionFreeze Sequence PRE-CHILL Freeze 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 Wiring Diagram Legend Section Electrical System Wiring Diagrams Control Board S1800 SELF-CONTAINED 1 Phase S1800 SELF-CONTAINED 3 Phase Main Fuse SpecificationsCheck Procedure BIN Switch Water Curtain Removal Notes SymptomsDiagnostic Aids Continuity Test Determine if the Compressor is Seized Compressor Electrical DiagnosticsCheck Resistance Ohm Values Check Motor Windings to Ground What is a PTCR? Ptcr DiagnosticsCompressor Start Sequence During Start-Up First .25 1.0 Seconds Troubleshooting PTCR’sWHY a Good Ptcr MAY Fail To Start the Compressor Model Automatic Shut-Off and Restart Part Number Checking the PtcrManitowoc Ptcr Model Manitowoc Cera-Mite Room Relay Operation Check Diagnosing Start ComponentsCapacitor Relay Switch Setting Terminals Ohm Reading ICE/OFF/CLEAN Toggle Switch Control Board Electronic Control Board Inputs Safety Limits Harvest Light Freeze Time LOCK-IN FeatureIce Thickness Probe Cleaning HOW the Probe Works Monitoring of Harvest Light Correction Diagnosing ICE Thickness Control Circuitry Freeze Cycle Circuitry Water Inlet Valve Safety SHUT-OFFElectrical System Section Water Level Control Circuitry Water Level Probe Light Diagnosing 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 Freeze Cycle Refrigeration Sequence SELF-CONTAINED Water -COOLED Models Refrigeration System Section S1800 SELF-CONTAINED Tubing Schematic General Times are in minutes Before Beginning ServiceWeights are in pounds ICE Production Check Water System Checklist INSTALLATION/VISUAL Inspection ChecklistPossible Problem Corrective Action Extremely Thin at Evaporator Outlet ICE Formation PatternNormal Ice Formation No Ice Formation Extremely Thin at Evaporator Inlet Safety Limit Indication Safety LimitsAnalyzing Why Safety Limits May Stop the Ice Machine Possible Cause Check/Correct Safety Limit Notes Section Refrigeration System Analyzing Discharge Pressure During Freeze or Harvest Cycle ProcedureFreeze Cycle Discharge Pressure High Checklist Freeze Cycle Discharge Pressure Low Checklist Analyzing Suction Pressure During Freeze Cycle Step Example Using SY1004A Model Ice Machine Freeze Cycle Suction Pressure Low Checklist Freeze Cycle Suction Pressure High Checklist Harvest Valve Analysis Harvest Valve Temperature Check GeneralFindings Comments Discharge Line Temperature Analysis General Column 3 TXV Flooding Final AnalysisColumn 1 Harvest Valve Leaking Column 2 LOW CHARGE/TXV Starving Models Dual Expansion Valve Ice Machine Model Number Refrigeration System Operational Analysis Tables High Pressure CUT-OUT Hpco Control Operating Pressures S1800 SeriesSelf-Contained Water-Cooled Cycle Times Hour Ice Production Connections SELF-CONTAINED RECOVERY/EVACUATION Charging Connections Self-Contained Charging Procedures Determining Severity Of Contamination System Contamination CLEAN-UP Severe System Contamination Cleanup Procedure Mild System Contamination Cleanup Procedure Section Refrigeration System 10. Using Pinch-Off Tool Drier End Part Model Connection Size Number FILTER-DRIERS Series Version Charge S1800M Total System Refrigerant Charges48 oz Recycle RecoverNew Product Specifications Refrigerant Definitions Reclaimed Refrigerant Recovered or Recycled RefrigerantRefrigerant RE-USE Policy New Refrigerant HFC Refrigerant Questions and Answers This page Intentionally Left Blank Page Attend a Manitowoc Factory Service School

Manitowoc Ice S1800 SELF-CONTAINED Water -COOLED Models, Freeze Cycle Refrigeration Sequence

Models: S1800

Section 7

Section 7

Refrigeration System