Manitowoc
Manitowoc Manitowoc
FINAL ANALYSISThe column with the highest number of check marksidentifies the refrigeration problem.Column 1 – Hot Gas Valve LeakingA leaking hot gas valve must be replaced.Column 2 – Low Charge/TXV StarvingNormally, a starving expansion valve only affects thefreeze cycle pressures, not the harvest cyclepressures. A low refrigerant charge normally affectsboth pressures. Verify the ice machine is not low oncharge before replacing an expansion valve.Add refrigerant charge in 2 oz. increments as adiagnostic procedure to verify a low charge. (Do notadd more than the total charge of refrigerant). If theproblem is corrected, the ice machine is low oncharge. Find the refrigerant leak.The ice machine must operate with the nameplatecharge. If the leak cannot be found, proper refrigerantprocedures must still be followed. Change the liquidline drier, evacuate the system and weigh in the propercharge.If the problem is not corrected by adding charge, theexpansion valve is faulty.Column 3 – TXV FloodingA loose or improperly mounted expansion valve bulbcauses the expansion valve to flood. Check bulbmounting, insulation, etc., before changing the valve.Column 4 – CompressorReplace the compressor and start components. Toreceive warranty credit, the compressor ports must beproperly sealed by crimping and soldering themclosed. Old start components must be returned withthe faulty compressor.130 Part Number 80-01111-9 7/10
REFRIGERATION COMPONENT DIAGNOSTICCHARTQ130/Q170/Q210/Q270 Ice Machines OnlyOperationalAnalysisIce ProductionInstallation andWater systemIce FormationPattern1234Published 24 hour ice production ____________Calculated (actual) 24 hour ice production ____________Note: The ice machine is operating properly if the ice fill patterns is normal and iceproduction is within 10% of charted capacity.All installation and water related problems must be correctedbefore proceeding with chart.Ice formation isextremely thin ontop of evaporator-or-No ice formationon entireevaporatorIce formation isextremely thin ontop of evaporator-or-No ice formationon entireevaporatorIce formation isnormal-oriceformation isextremely thin onthe bottom of theevaporator orNo ice formationon evaporatorIce formation isnormal-or-No ice formationon entireevaporatorPart Number 80-01111-9 7/10 131
- Page 80 and 81: HARVEST SEQUENCE5. HarvestThe water
- Page 82 and 83: ICE MAKINGSEQUENCE OFOPERATIONHarve
- Page 84 and 85: HARVEST SEQUENCE4. Harvest CycleThe
- Page 86 and 87: SM50INITIAL START-UP OR START-UP AF
- Page 88 and 89: ENERGIZED PARTS CHARTSM50Self-conta
- Page 90 and 91: Water Level CheckThe float valve is
- Page 92 and 93: QM20/QM30Routine adjustments and ma
- Page 94 and 95: 5. Remove the two screws holding th
- Page 96 and 97: Clean (Green)Pressing the “Clean
- Page 98 and 99: This Page Intentionally Left Blank9
- Page 100 and 101: DIAGNOSING ICE THICKNESS CONTROLCIR
- Page 102 and 103: Ice Machine Cycles Into Harvest Bef
- Page 104 and 105: INSTALLATION AND VISUAL INSPECTIONC
- Page 106 and 107: ICE FORMATION PATTERNEvaporator ice
- Page 108 and 109: SAFETY LIMIT FEATUREIn addition to
- Page 110 and 111: Safety Limit Notes• A safety limi
- Page 112 and 113: Safety Limit ChecklistThe following
- Page 114 and 115: Safety Limit #2Harvest time exceeds
- Page 116 and 117: Discharge Pressure High ChecklistIm
- Page 118 and 119: ProcedureStep1. Determine the ice m
- Page 120 and 121: Suction Pressure Low ChecklistImpro
- Page 122 and 123: Hot Gas Valve AnalysisThe valve can
- Page 124 and 125: FindingsThe inlet of the harvestval
- Page 126 and 127: DISCHARGE LINE TEMPERATURE ANALYSIS
- Page 128 and 129: REFRIGERATION COMPONENT DIAGNOSTICC
- Page 132 and 133: Q130/Q170/Q210/Q270 Ice Machines On
- Page 134 and 135: QM20/QM30DIAGNOSING AN ICE MACHINET
- Page 136 and 137: QM30The QM30 ice machines have a ve
- Page 138 and 139: Ice Production CheckThe QM20/QM30 d
- Page 140 and 141: REFRIGERATION DIAGNOSTICSImportant:
- Page 142 and 143: 5. Install thermometer thermocouple
- Page 144 and 145: SM50DIAGNOSING AN ICE MACHINETHAT W
- Page 146 and 147: ICE QUALITY IS POOR — CUBES ARE S
- Page 148 and 149: ICE MACHINE RUNS AND NO ICE IS PROD
- Page 150 and 151: DISCHARGE PRESSURE HIGH CHECKLISTIm
- Page 152 and 153: ProcedureStep1. Determine the ice m
- Page 154 and 155: Other• Non-Manitowoc components i
- Page 156 and 157: FindingsThe inlet of the harvestval
- Page 158 and 159: ADJUSTING CUBE WEIGHTThe cube weigh
- Page 160 and 161: Bin SwitchQM45/Q130/Q170/Q210/Q270F
- Page 162 and 163: Bin Switch Removal — QM45/Q1301.
- Page 164 and 165: Bin ThermostatQM20/QM30FunctionThe
- Page 166 and 167: SM50FunctionThe bin thermostat stop
- Page 168 and 169: Check Procedure! WarningHigh (line)
- Page 170 and 171: Temperature/Resistance ChartAs the
- Page 172 and 173: ON/OFF/WASH Toggle SwitchFUNCTIONTh
- Page 174 and 175: Ice Thickness ProbeQM45/Q130/Q170/Q
- Page 176 and 177: Compressor Electrical DiagnosticsTh
- Page 178 and 179: Fan Cycle ControlQM45/Q130/Q170/Q21
FINAL ANALYSISThe column with the highest number of check marksidentifies the refrigeration problem.Column 1 – Hot Gas Valve LeakingA leaking hot gas valve must be replaced.Column 2 – Low Charge/TXV StarvingNormally, a starving expansion valve only affects thefreeze cycle pressures, not the harvest cyclepressures. A low refrigerant charge normally affectsboth pressures. Verify the ice machine is not low oncharge before replacing an expansion valve.Add refrigerant charge in 2 oz. increments as adiagnostic procedure to verify a low charge. (Do notadd more than the total charge of refrigerant). If theproblem is corrected, the ice machine is low oncharge. Find the refrigerant leak.The ice machine must operate with the nameplatecharge. If the leak cannot be found, proper refrigerantprocedures must still be followed. Change the liquidline drier, evacuate the system and weigh in the propercharge.If the problem is not corrected by adding charge, theexpansion valve is faulty.Column 3 – TXV FloodingA loose or improperly mounted expansion valve bulbcauses the expansion valve to flood. Check bulbmounting, insulation, etc., before changing the valve.Column 4 – CompressorReplace the compressor and start components. Toreceive warranty credit, the compressor ports must beproperly sealed by crimping and soldering themclosed. Old start components must be returned withthe faulty compressor.130 Part Number 80-01111-9 7/10