Manitowoc Ice STH003 manual Suction Pressure High Checklist Problem, Discharge Pressure

Page 51

SUCTION PRESSURE HIGH CHECKLIST Problem

•Cause

Improper Installation

•Refer to “Installation/Visual Inspection Checklist”

Discharge Pressure

•Discharge pressure is too high, and is affecting suction pressure, refer to “Freeze Cycle Discharge Pressure High Checklist”

Improper Refrigerant Charge

•Overcharged

•Wrong type of refrigerant

•Non Condensable in system

Other

•Non-Manitowoc components in system

•Hot gas valve leaking

•Defective compressor

•Water inlet valve leaking

SUCTION PRESSURE LOW CHECKLIST Problem

•Cause

Improper Installation

•Refer to “Installation/Visual Inspection Checklist”

Discharge Pressure

•Discharge pressure is too low, and is affecting suction pressure, refer to “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 refer to “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

NOTE: Do not limit your diagnosis to only the items listed in the checklists.

51

Image 51

Contents CM050 CM Model Ice Machines Safety Notices Procedural Notices Read These Before Proceeding Personal Injury PotentialPotential Personal Injury Situation Table of Contents Liquid Line Thermistor Model Numbers CMS050A004Accessories Legs Manitowoc ICE Machine Cleaner and SanitizerDrain 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 SERVICE/DRAINS Water Supply Water Inlet LinesDrain Connections Water Supply and Drain Line SIZING/CONNECTIONS Drain PumpGfci Requirements Electrical SpecificationsElectrical Requirements Voltage Minimum Circuit AmpacityComponent Identification Water Pump Evaporator Shutter Assembly Operational Checks BIN Thermostat AdjustmentPower Button Green Clean GreenSafety 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 GeneralAutomatic Shut-Off Refrigeration System Start-UpFreeze HarvestSequence 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 High Checklist Problem Suction Pressure LOW Checklist ProblemDischarge Pressure HOT GAS Valve GeneralNormal 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 Check Motor Windings to Ground Compressor Electrical DiagnosticsSingle Phase Compressors Check Resistance OHM ValuesCompressor Drawing High Amps Compressor Drawing Locked RotorRelay CapacitorPage Cycle Times Freeze Time + Harvest Time = Cycle Time Reclaim RecoverNew Product Specifications RecycleRefrigerant 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