Marine Q 1800 Ice Machine Service Manual - Manitowoc Ice

Table of ContentsRefrigeration SystemSequence of OperationSelf-Contained Water-Cooled Models .........................................................................................................28Operational Analysis (Diagnostics)General............................................................................................................................................................29Before Beginning Service ..............................................................................................................................30Ice Production Check ....................................................................................................................................30Installation/Visual Inspection Checklist ......................................................................................................31Water System Checklist ................................................................................................................................31Ice Formation Pattern ...................................................................................................................................32Safety Limits...................................................................................................................................................34Hot Gas Valve Temperature Check .............................................................................................................37Analyzing Discharge Pressure During Freeze or Harvest CycleProcedure..................................................................................................................................................38Freeze Cycle Discharge Pressure High Checklist .................................................................................38Freeze Cycle Discharge Pressure Low Checklist ..................................................................................38Analyzing Suction Pressure During Freeze CycleProcedure..................................................................................................................................................39Freeze Cycle Suction Pressure High Checklist .....................................................................................40Freeze Cycle Suction Pressure Low Checklist ......................................................................................40How to Use the Refrigeration System Operational Analysis Tables.........................................................41Refrigeration System Operational Analysis TableDual TXV..................................................................................................................................................42Pressure Control Specifications and DiagnosticsHigh Pressure Cutout (HPCO) Control.......................................................................................................43Cycle Time/24 Hour Ice Production/Refrigerant Pressure ChartsQ1800 ..............................................................................................................................................................44Refrigerant Recovery/Evacuating and RechargingNormal Self-Contained Model Procedures..................................................................................................45System Contamination Cleanup ...................................................................................................................47Replacing Pressure Controls Without Removing Refrigerant Charge ....................................................49Filter-Driers....................................................................................................................................................51Total System Refrigerant Charges...............................................................................................................51Refrigerant Definitions..................................................................................................................................52Refrigerant Re-Use Policy.............................................................................................................................53HFC Refrigerant Questions and Answers ...................................................................................................54