Freeze Cycle Suction Pressure High Checklist | Manitowoc Ice S1800

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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Manitowoc Ice S1800 Freeze Cycle Suction Pressure High Checklist, Freeze Cycle Suction Pressure Low Checklist

Contents

Service Manual Read These Before Proceeding Personal Injury Potential Table of Contents Section Before Calling For Service Table of Contents Section Ice Machine OperationSection Maintenance Table of Contents Section Electrical System Section Refrigeration System Table of Contents How to Read a Model Number Model NumbersIce Cube Sizes Self-Contained Water-Cooled General Information Section Accessories Section General Information Model/Serial Number Location Model/Serial Number Location Warranty Coverage Ice Machine Dimensions Width, Depth, and Height DimensionsElectrical and AuCS Dimensions General Installation Instructions Section Location of Ice Machine Ice Machine Heat of RejectionS1800M Water-Cooled Series Heat of Rejection Ice Machine Air Conditioning Section Installation Instructions Electrical Service VoltageMinimum Circuit Ampacity Electrical Requirements For 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 230/1/50 Cooling Tower Applications Water SupplyWater Inlet Lines Drain Connections Installation Instructions Section Typical Water Supply Drain InstallationWater Supply and Drain Line SIZING/CONNECTIONS Condenser Section Installation Instructions Installation Check List AuCS Automatic Cleaning System Potential Personal Injury Situation Section Ice Machine Operation Component Identification Ice Machine Operation Section Sequence Of Operation Initial START-UP or START-UP After Automatic SHUT-OFF Safety Timers Harvest Sequence 5. Water PurgeHarvest Automatic SHUT-OFF 7. Automatic Shut-Off Ice Machine Operation Section Operational Checks Water LevelICE Thickness Check Ice Thickness Check Water Purge Adjustment Harvest Sequence Water Purge Ice Machine Operation Section This page Intentionally Left Blank Exterior Cleaning Ice Machine InspectionWater-Cooled Condenser Water Regulating Valve AlphaSan→ Maintenance Section Guardian InstallationSachet Replacement Frequency Sachet Replacement Procedure Section Maintenance Interior Cleaning and Sanitizing Cleaning ProcedureModel Amount of Cleaner Step Solution Type Water Mixed With Sanitizer Maintenance SectionSanitizing Procedure Removal of Parts for CLEANING/SANITIZING Solution Type Water Mixed With Ice 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 Valve Evaporator Tray Removal Drain Line Check Valve Water 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 Correct Before Calling For Service Section Safety Limit Feature SELF-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 Purge Self-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 Models Self-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 Legend S1800 SELF-CONTAINED 1 Phase Control Board S1800 SELF-CONTAINED 3 Phase Specifications Check ProcedureBIN Switch Main Fuse Symptoms Diagnostic AidsContinuity Test Water Curtain Removal Notes Compressor Electrical Diagnostics Check Resistance Ohm ValuesCheck Motor Windings to Ground Determine if the Compressor is Seized Compressor 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 Seconds Checking the Ptcr Manitowoc PtcrModel Manitowoc Cera-Mite Room Part Number Diagnosing Start Components CapacitorRelay Relay Operation Check ICE/OFF/CLEAN Toggle Switch Switch Setting Terminals Ohm Reading Electronic Control Board Control Board Safety Limits Inputs Freeze Time LOCK-IN Feature Ice Thickness Probe CleaningHOW the Probe Works Harvest Light Diagnosing ICE Thickness Control Circuitry Monitoring of Harvest Light Correction Water Inlet Valve Safety SHUT-OFF Electrical System Section Water Level Control CircuitryWater Level Probe Light Freeze Cycle Circuitry Wait 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 Sequence Refrigeration System Section S1800 SELF-CONTAINED Tubing Schematic General Before Beginning Service Weights are in poundsICE Production Check Times are in minutes Possible 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 Formation Analyzing Why Safety Limits May Stop the Ice Machine Safety LimitsSafety Limit Indication Safety Limit Notes Possible Cause Check/Correct Section Refrigeration System Procedure Freeze Cycle Discharge Pressure High ChecklistFreeze Cycle Discharge Pressure Low Checklist Analyzing Discharge Pressure During Freeze or Harvest Cycle Step Example Using SY1004A Model Ice Machine Analyzing Suction Pressure During Freeze Cycle Freeze Cycle Suction Pressure High Checklist Freeze Cycle Suction Pressure Low Checklist Findings 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 Flooding Refrigeration System Operational Analysis Tables Models Dual Expansion Valve Ice Machine Model Number High Pressure CUT-OUT Hpco Control S1800 Series Self-Contained Water-Cooled Cycle TimesHour Ice Production Operating Pressures SELF-CONTAINED RECOVERY/EVACUATION Connections Self-Contained Charging Procedures Charging Connections System Contamination CLEAN-UP Determining Severity Of Contamination Mild System Contamination Cleanup Procedure Severe System Contamination Cleanup Procedure Section Refrigeration System 10. Using Pinch-Off Tool FILTER-DRIERS Drier End Part Model Connection Size Number 48 oz Total System Refrigerant ChargesSeries Version Charge S1800M Recover New Product SpecificationsRefrigerant Definitions Recycle Recovered or Recycled Refrigerant Refrigerant RE-USE PolicyNew Refrigerant Reclaimed Refrigerant HFC Refrigerant Questions and Answers This page Intentionally Left Blank Page Attend a Manitowoc Factory Service School