Manitowoc

TROUBLESHOOTINGQM45/Q130/Q170/Q210/Q270 . . . . . . . . . 99Diagnosing an Ice Machinethat Will Not Run . . . . . . . . . . . . . . . . . 99Diagnosing Ice Thickness Control Circuitry . . . . . . . . . . . . . . . . . . . . . . . . 100Ice Production Check . . . . . . . . . . . . . 103Installation and Visual Inspection Checklist . . . . . . . . . . . . . . . . . . . . . . . 104Water System Checklist . . . . . . . . . . . 105Ice Formation Pattern . . . . . . . . . . . . . 106Safety Limit Feature . . . . . . . . . . . . . . 108Analyzing Discharge Pressure . . . . . . 115Analyzing Suction Pressure . . . . . . . . 117Hot Gas Valve . . . . . . . . . . . . . . . . . . . 121Comparing Evaporator Inlet/OutletTemperatures . . . . . . . . . . . . . . . . . . . 125Discharge Line Temperature Analysis 126Refrigeration Component Diagnostic Chart . . . . . . . . . . . . . . . . . . . . . . . . . . 128Final Analysis . . . . . . . . . . . . . . . . . . . 130Refrigeration Component Diagnostic Chart131QM20/QM30 . . . . . . . . . . . . . . . . . . . . . . . . 134Diagnosing an Ice Machinethat Will Not Run . . . . . . . . . . . . . . . . . 134Refrigeration Diagnostics . . . . . . . . . . 135Ice Formation Pattern . . . . . . . . . . . . . 137QM45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139Electrical . . . . . . . . . . . . . . . . . . . . . . . 139Refrigeration Diagnostics . . . . . . . . . . 140Flooding Expansion Valve . . . . . . . . . . 143Starving Expansion Valve/Low Refrigerant Charge . . . . . . . . . . . 143Overcharged System . . . . . . . . . . . . . 143SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144Diagnosing an Ice Machinethat Will Not Run . . . . . . . . . . . . . . . . . 144Ice Machine Will Not Harvest . . . . . . . 145Ice Quality Is Poor — Cubes are Shallow, Incomplete or White . . . . . . . 146Part Number 80-01111-9 7/10 7