Manitowoc Ice STH003 manual Analyzing Suction Pressure

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ANALYZING SUCTION PRESSURE

The suction pressure gradually drops throughout the freeze cycle. The actual suction pressure (and drop rate) changes as the air and water temperature entering the ice machine changes. These variables also determine the freeze cycle times.

To analyze and identify the proper suction pressure drop throughout the freeze cycle, compare the published suction pressure to the published freeze cycle time.

NOTE: Analyze discharge pressure before analyzing suction pressure. High or low discharge pressure may be causing high or low suction pressure.

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Contents CM050 CM Model Ice Machines Safety Notices Procedural Notices Personal Injury Potential Read These Before ProceedingPotential Personal Injury Situation Table of Contents Liquid Line Thermistor Model Numbers CMS050A004Manitowoc ICE Machine Cleaner and Sanitizer Accessories LegsDrain Pump MODEL/SERIAL Number Location General Owner Warranty Registration CardPage Manitowoc ICE, INC Location of ICE Machine InstallationHeat of Rejection Air Conditioning** Peak ICE Machine Heat of RejectionLevelers Legs Leveling the ICE MachineWater Inlet Lines Water SERVICE/DRAINS Water SupplyDrain Connections Water Supply and Drain Line SIZING/CONNECTIONS Drain PumpElectrical Requirements Voltage Electrical SpecificationsMinimum Circuit Ampacity Gfci RequirementsComponent Identification Water Pump Evaporator Shutter Assembly Power Button Green BIN Thermostat AdjustmentClean Green Operational ChecksSafety Timers ICE Machine Inspection Cleaning the CondenserAIR-COOLED Condenser Interior Cleaning and Sanitizing Place CLEANING/SANITIZING Procedure Interior Cleaning and Sanitizing GeneralPage Cleaning Procedure Page Page Removal of Parts for Cleaning and Sanitizing TOP Cover Water Shutters ICE Chute Sump Drain Overflow Tube Water Trough Spray BAR, Water Pump and Hose Spray BAR Disassembly SELF-CONTAINED AIR-COOLED ICE Machines Removal from SERVICE/LONG Term STORAGE/WINTERIZATION GeneralFreeze Refrigeration System Start-UpHarvest Automatic Shut-OffSequence Energized Parts Chart SELF-CONTAINED ICE MachinesDiagnosing AN ICE Machine That will not RUN TroubleshootingPage ICE Machine will not Harvest ICE Quality is Poor Cubes are SHALLOW, Incomplete or White Freeze Cycle is LONG, LOW ICE Production ICE Machine Runs & no ICE is Produced Freeze Harvest Cycle Psig Beginning Freeze Cycle Discharge Pressure LOW Checklist Analyzing Suction Pressure Step ProcedureSuction Pressure LOW Checklist Problem Suction Pressure High Checklist ProblemDischarge Pressure General HOT GAS ValveNormal Operation HOT GAS Valve Analysis Freeze cycle. If Function SpecificationsNo Ice on Ice on Bulb Result Check ProcedureFreeze Time Harvest Time Total Cycle Time Additional finishing time check Adjusting Finishing TimeLiquid Line Thermistor SM50 Resistance Chart TEMPERATURE/RESISTANCE ChartTotal System Refrigeration Charge Component Specifications Check Procedures Single Phase Compressors Compressor Electrical DiagnosticsCheck Resistance OHM Values Check Motor Windings to GroundCompressor Drawing High Amps Compressor Drawing Locked RotorRelay CapacitorPage Cycle Times Freeze Time + Harvest Time = Cycle Time New Product Specifications RecoverRecycle ReclaimRefrigerant RE-USE Policy Page Connections Refrigerant Recovery/Evacuation/ChargingRecovery/Evacuation Charging Procedures Page System Contamination Cleanup General No symptoms or suspicion Normal Mild System Contamination Cleanup Procedure Change the vacuum pump oil Severe System Contamination Cleanup ProcedureFollow normal evacuation procedures Page FIG. a Pinching OFF Tubing Using Pinch Off ToolDo not disassemble valve Brazing Procedures for Danfoss Solenoid ValvesMAX F 700C Liquid Line Filter Drier Control Board Wiring Diagrams Tubing Schematic Manitowoc Ice, Inc