Manitowoc Ice S1800 service manual Harvest

Page 45

Section 6

Electrical System

 

 

6. HARVEST

The harvest valve(s) remains open and the refrigerant gas warms the evaporator. This causes the cubes to slide, as a sheet, off the evaporator and into the storage bin.

The sliding sheet of cubes swings the water curtain out, opening the bin switch. This momentary opening and closing of the bin switch terminates the Harvest Cycle and returns the ice machine to the Freeze Cycle (steps 3-4).

The air compressor (when used) remains energized throughout the entire harvest cycle. The air compressor will automatically energize after 60 seconds when the harvest cycle time exceeded 75 seconds in the previous cycle.

L1

 

 

 

 

L2 or N

Ground

 

 

 

 

 

 

 

Water Valve

(99)

 

 

 

 

 

 

 

(20)

(21)

 

(89)

(55)

 

 

(61)

(22)

 

 

High

 

 

 

Control Board

 

Harvest Valve

 

 

Pressure

 

 

 

(2)

 

 

(88)

Cutout

(60)

(77)

 

(6)

 

 

 

(80)

 

 

 

(5)

 

Dump Valve

(75)

 

 

(1)

 

(76)

 

 

(7)

 

(81)

 

 

 

(4)

(57)

Water Pump

 

 

 

 

(98)

 

 

 

 

 

 

 

(42)

Trans.

 

 

 

Fuse (7a)

(58)

Terminates at

 

 

 

Pin Connection

 

 

 

 

 

(59)

 

 

 

L2

 

Contactor Coil

 

 

 

(25)

 

(56)

 

 

 

 

(26)

Air Compressor

 

 

 

 

 

Ice Thickness

 

(9)

 

 

(74)

Probe

 

(8)

 

Water Level Probe

 

 

 

Bin Switch

 

Low DC

 

(6)

 

 

 

 

 

 

 

Voltage

 

 

Clean

 

 

Plug

 

(1)

 

 

 

OFF

 

 

 

 

 

 

 

 

(2)

ICE

 

 

(Red)

 

 

 

 

 

 

 

 

 

Compressor

 

 

Contactor

Overload

(Yellow)

(46)

Run Capacitor

 

 

 

(50)

Contacts

 

 

 

 

(Black)

 

 

 

 

(45)

L1

 

 

 

 

(51)

(85)

(86)

 

PTCR

 

Fan Motor

 

Fan Cycle

 

 

 

 

 

 

Control

 

 

 

 

 

Run Capacitor

 

 

 

SV3137-7

Table 6-6. Self-Contained Models

 

 

 

 

 

 

 

6. Harvest (Until Bin Switch Activation)

 

 

Toggle Switch

 

ICE

Bin Switch

 

Closed

Control Board Relays

 

 

#1

Water Pump

 

OFF

#2

Harvest Valve (Left)

 

ON

#3

Harvest Valve (Right)

 

ON (When Used)

#4

Air Compressor

 

ON (When Used)

#5

Water Inlet Valve

 

OFF

#6

Water Dump Valve

 

OFF

#7

Contactor Coil

 

Closed / ON

#7A

Compressor

 

ON

#7B

Condenser Fan Motor

 

OFF; May Cycle ON

Safety Controls (Which could stop ice machine operation)

 

 

 

High Pressure Cut-Out

 

Closed

 

Main Fuse (On Control Board)

 

Closed

Part Number 80-1634-3

6-7

Page 44 Page 46
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Page 44 Page 46
Contents Service Manual Personal Injury Potential Read These Before ProceedingTable of Contents Table of Contents Section Ice Machine Operation Section MaintenanceSection Before Calling For Service Section Refrigeration System Table of Contents Section Electrical SystemTable of Contents Model Numbers How to Read a Model NumberIce Cube Sizes Self-Contained Water-CooledGeneral Information Section Accessories Model/Serial Number Location Section General Information Model/Serial Number LocationWarranty Coverage Width, Depth, and Height Dimensions Ice Machine DimensionsElectrical and AuCS Dimensions GeneralIce Machine Heat of Rejection Installation Instructions Section Location of Ice MachineS1800M Water-Cooled Series Heat of Rejection Ice Machine Air ConditioningVoltage Section Installation Instructions Electrical ServiceMinimum Circuit Ampacity Electrical RequirementsSelf Contained ICE Machine 115/1/60 or 208-230/1/60 For United Kingdom OnlySelf Contained ICE Machine 208-230/3/60 Self Contained ICE Machine 230/1/50Water Supply Cooling Tower ApplicationsWater Inlet Lines Drain ConnectionsTypical Water Supply Drain Installation Installation Instructions SectionWater Supply and Drain Line SIZING/CONNECTIONS CondenserSection Installation Instructions Installation Check List Potential Personal Injury Situation AuCS Automatic Cleaning SystemComponent Identification Section Ice Machine OperationInitial START-UP or START-UP After Automatic SHUT-OFF Ice Machine Operation Section Sequence Of OperationHarvest Sequence 5. Water Purge Safety TimersHarvest Automatic SHUT-OFF 7. Automatic Shut-OffWater Level Ice Machine Operation Section Operational ChecksICE Thickness Check Ice Thickness CheckHarvest Sequence Water Purge Water Purge AdjustmentThis page Intentionally Left Blank Ice Machine Operation SectionIce Machine Inspection Exterior CleaningWater-Cooled Condenser Water Regulating Valve AlphaSan→Installation Maintenance Section GuardianSachet Replacement Frequency Sachet Replacement ProcedureCleaning Procedure Section Maintenance Interior Cleaning and SanitizingModel Amount of Cleaner StepMaintenance Section Sanitizing ProcedureSolution Type Water Mixed With Sanitizer Solution Type Water Mixed With Removal of Parts for CLEANING/SANITIZINGWater Curtain Water Curtain Removal Ice Thickness ProbeIce Thickness Probe Removal Water Distribution Tube Water TroughWater Distribution Tube Removal Water Level Probe Water PumpWater Pump Removal Water Dump Valve Dump Valve DisassemblyDrain Line Check Valve Evaporator Tray RemovalWater Inlet Valve Maintenance Section Removal from Service/Winterization Pry Open the Water Regulating Valve AUCS→ AccessorySELF-CONTAINED WATER-COOLED ICE Machines Problem Possible Cause To Correct ChecklistSafety Limit Feature Before Calling For Service SectionEnergized Parts Charts Section Electrical SystemSELF-CONTAINED WATER-COOLED Models Initial Start-Up or Start-Up After Automatic Shut-Off SELF-CONTAINED ModelsWater Purge Self-Contained Water PurgeRefrigeration System Start Up 5 Seconds Toggle Switch Refrigeration System START-UPSelf-Contained Refrigeration System Start-Up Freeze Sequence Electrical System Section PRE-CHILL Self-Contained Pre-Chill Self-Contained ModelsToggle Switch Bin Switch Control Board Relays FreezeSelf-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 DiagramsControl Board S1800 SELF-CONTAINED 1 PhaseS1800 SELF-CONTAINED 3 Phase Check Procedure SpecificationsBIN Switch Main FuseDiagnostic Aids SymptomsContinuity Test Water Curtain Removal NotesCheck Resistance Ohm Values Compressor Electrical DiagnosticsCheck Motor Windings to Ground Determine if the Compressor is SeizedPtcr Diagnostics What is a PTCR?Compressor Start Sequence WHY a Good Ptcr MAY Fail To Start the Compressor Troubleshooting PTCR’sModel Automatic Shut-Off and Restart During Start-Up First .25 1.0 SecondsManitowoc Ptcr Checking the PtcrModel Manitowoc Cera-Mite Room Part NumberCapacitor Diagnosing Start ComponentsRelay Relay Operation CheckSwitch Setting Terminals Ohm Reading ICE/OFF/CLEAN Toggle SwitchControl Board Electronic Control BoardInputs Safety LimitsIce Thickness Probe Cleaning Freeze Time LOCK-IN FeatureHOW the Probe Works Harvest LightMonitoring of Harvest Light Correction Diagnosing ICE Thickness Control CircuitryElectrical System Section Water Level Control Circuitry Water Inlet Valve Safety SHUT-OFFWater Level Probe Light Freeze Cycle CircuitryProblem Water Trough Overfilling During Freeze Cycle Diagnosing Water Level Control CircuitryWait 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 ModelsRefrigeration System Section S1800 SELF-CONTAINED Tubing Schematic General Weights are in pounds Before Beginning ServiceICE Production Check Times are in minutesINSTALLATION/VISUAL Inspection Checklist Water System ChecklistPossible Problem Corrective Action ICE Formation Pattern Extremely Thin at Evaporator OutletNormal Ice Formation No Ice Formation Extremely Thin at Evaporator InletSafety Limits Safety Limit IndicationAnalyzing Why Safety Limits May Stop the Ice Machine Possible Cause Check/Correct Safety Limit NotesSection Refrigeration System Freeze Cycle Discharge Pressure High Checklist ProcedureFreeze Cycle Discharge Pressure Low Checklist Analyzing Discharge Pressure During Freeze or Harvest CycleAnalyzing Suction Pressure During Freeze Cycle Step Example Using SY1004A Model Ice MachineFreeze Cycle Suction Pressure Low Checklist Freeze Cycle Suction Pressure High ChecklistHarvest Valve Temperature Check General Harvest Valve AnalysisFindings Comments Discharge Line Temperature Analysis General Column 1 Harvest Valve Leaking Final AnalysisColumn 2 LOW CHARGE/TXV Starving Column 3 TXV FloodingModels Dual Expansion Valve Ice Machine Model Number Refrigeration System Operational Analysis TablesHigh Pressure CUT-OUT Hpco Control Self-Contained Water-Cooled Cycle Times S1800 SeriesHour Ice Production Operating PressuresConnections SELF-CONTAINED RECOVERY/EVACUATIONCharging Connections Self-Contained Charging ProceduresDetermining Severity Of Contamination System Contamination CLEAN-UPSevere System Contamination Cleanup Procedure Mild System Contamination Cleanup ProcedureSection Refrigeration System 10. Using Pinch-Off Tool Drier End Part Model Connection Size Number FILTER-DRIERSTotal System Refrigerant Charges Series Version Charge S1800M48 oz New Product Specifications RecoverRefrigerant Definitions RecycleRefrigerant RE-USE Policy Recovered or Recycled RefrigerantNew Refrigerant Reclaimed RefrigerantHFC Refrigerant Questions and Answers This page Intentionally Left Blank Page Attend a Manitowoc Factory Service School
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