Extremely Thin at Evaporator Inlet | Manitowoc Ice S1800 guide

Refrigeration System	Section 7

3. Extremely Thin at Evaporator Inlet

There is no ice, or a considerable lack of ice formation at the inlet of the evaporator. Examples: The ice at the outlet of the evaporator reaches 1/8" to initiate a harvest, but there is no ice formation at all at the inlet of the evaporator.

Possible causes: Insufficient water flow, flooding TXV, etc.

OUTLET

ICE

INLET

Figure 7-4. Extremely Thin Ice Formation at

Evaporator Inlet

4. Spotty Ice Formation

There are small sections on the evaporator where there is no ice formation. This could be a single corner, or a single spot in the middle of the evaporator. This is generally caused by loss of heat transfer from the tubing on the back side of the evaporator.

5. No Ice Formation

The ice machine operates for an extended period, but there is no ice formation at all on the evaporator.

Possible causes: Water inlet valve, water pump, starving expansion valve, low refrigerant charge, compressor, etc.

OUTLET

INLET

Figure 7-6. No Ice Formation

Important

The S1800 model machines have left and right expansion valves and separate evaporator circuits. These circuits operate independently from each other. Therefore, one may operate properly while the other is malfunctioning.

Example: If the left expansion valve is starving, it may not affect the ice formation pattern on the entire right side of the evaporator.

OUTLET

ICE	OUTLET

INLET

INLET

Figure 7-5. Spotty Ice Formation

Figure 7-7. S1800 Evaporator Tubing

7-8	Part Number 80-1634-3

Image 74

Manitowoc Ice S1800 service manual Extremely Thin at Evaporator Inlet, No Ice Formation

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 Ice Cube Sizes How to Read a Model NumberModel Numbers Self-Contained Water-Cooled General Information Section Accessories Section General Information Model/Serial Number Location Model/Serial Number Location Warranty Coverage Electrical and AuCS Dimensions Ice Machine DimensionsWidth, Depth, and Height Dimensions General S1800M Water-Cooled Installation Instructions Section Location of Ice MachineIce Machine Heat of Rejection Series Heat of Rejection Ice Machine Air Conditioning Minimum Circuit Ampacity Section Installation Instructions Electrical ServiceVoltage Electrical Requirements Self Contained ICE Machine 208-230/3/60 For United Kingdom OnlySelf Contained ICE Machine 115/1/60 or 208-230/1/60 Self Contained ICE Machine 230/1/50 Water Inlet Lines Cooling Tower ApplicationsWater Supply Drain Connections Water Supply and Drain Line SIZING/CONNECTIONS Installation Instructions SectionTypical Water Supply Drain Installation 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 Harvest Safety TimersHarvest Sequence 5. Water Purge Automatic SHUT-OFF 7. Automatic Shut-Off ICE Thickness Check Ice Machine Operation Section Operational ChecksWater Level Ice Thickness Check Water Purge Adjustment Harvest Sequence Water Purge Ice Machine Operation Section This page Intentionally Left Blank Water-Cooled Condenser Water Regulating Valve Exterior CleaningIce Machine Inspection AlphaSan→ Sachet Replacement Frequency Maintenance Section GuardianInstallation Sachet Replacement Procedure Model Amount of Cleaner Section Maintenance Interior Cleaning and SanitizingCleaning Procedure 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 Water Purge SELF-CONTAINED ModelsInitial Start-Up or Start-Up After Automatic Shut-Off Self-Contained Water Purge Self-Contained Refrigeration System Start-Up Refrigeration System Start Up 5 Seconds Toggle SwitchRefrigeration System START-UP PRE-CHILL Electrical System SectionFreeze Sequence 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 BIN Switch SpecificationsCheck Procedure Main Fuse Continuity Test SymptomsDiagnostic Aids Water Curtain Removal Notes Check Motor Windings to Ground Compressor Electrical DiagnosticsCheck Resistance Ohm Values Determine if the Compressor is Seized Compressor Start Sequence Ptcr DiagnosticsWhat is a PTCR? Model Automatic Shut-Off and Restart Troubleshooting PTCR’sWHY a Good Ptcr MAY Fail To Start the Compressor During Start-Up First .25 1.0 Seconds Model Manitowoc Cera-Mite Room Checking the PtcrManitowoc Ptcr Part Number Relay Diagnosing Start ComponentsCapacitor Relay Operation Check ICE/OFF/CLEAN Toggle Switch Switch Setting Terminals Ohm Reading Electronic Control Board Control Board Safety Limits Inputs HOW the Probe Works Freeze Time LOCK-IN FeatureIce Thickness Probe Cleaning Harvest Light Diagnosing ICE Thickness Control Circuitry Monitoring of Harvest Light Correction Water Level Probe Light Water Inlet Valve Safety SHUT-OFFElectrical System Section Water Level Control Circuitry 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 ICE Production Check Before Beginning ServiceWeights are in pounds 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 Freeze Cycle Discharge Pressure Low Checklist ProcedureFreeze Cycle Discharge Pressure High 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 Column 2 LOW CHARGE/TXV Starving Final AnalysisColumn 1 Harvest Valve Leaking Column 3 TXV Flooding Refrigeration System Operational Analysis Tables Models Dual Expansion Valve Ice Machine Model Number High Pressure CUT-OUT Hpco Control Hour Ice Production S1800 SeriesSelf-Contained Water-Cooled Cycle Times 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 Refrigerant Definitions RecoverNew Product Specifications Recycle New Refrigerant Recovered or Recycled RefrigerantRefrigerant RE-USE Policy Reclaimed Refrigerant HFC Refrigerant Questions and Answers This page Intentionally Left Blank Page Attend a Manitowoc Factory Service School