Manitowoc
Manitowoc Manitowoc
Safety Limit #2Harvest time exceeds 3.5 minutes for 6Consecutive harvest cycles.Possible Cause ChecklistImproper installation• Refer to “Installation and Visual InspectionChecklist” on page 104.Water System• Water area (evaporator) dirty• Dirty/defective water dump valve• Vent tube not installed on water outlet drain• Water freezing behind evaporator• Plastic extrusions and gaskets not securelymounted to the evaporator• Low water pressure (20 psig min.)• Loss of water from sump area• Clogged water distribution tube• Dirty/defective float valve• Defective water pumpElectrical system• Ice thickness probe out of adjustment• Ice thickness probe dirty• Bin switch defective• Premature harvestRefrigeration system• Non-Manitowoc components• Improper refrigerant charge• Defective hot gas valve• TXV flooding (check bulb mounting)• Defective fan cycling control114 Part Number 80-01111-9 7/10
ANALYZING DISCHARGE PRESSUREQ130/Q170/Q210/Q270 Ice Machines Only1. Determine the ice machine operating conditions:Air temp. entering condenser ______Air temp. around ice machine ______Water temp. entering sump trough ______2. Refer to “Cycle Times, 24 Hr. Ice Production andRefrigerant Pressure Charts” on page 203 for icemachine being checked.Use the operating conditions determined in step 1 tofind the published normal discharge pressures.Freeze Cycle ______Harvest Cycle ______3. Perform an actual discharge pressure check.FreezeCycle PSIGHarvestCycle PSIGBeginning ofCycle __________ __________Middle ofCycle __________ __________End ofCycle __________ __________4. Compare the actual discharge pressure (step 3)with the published discharge pressure (step 2).The discharge pressure is normal when the actualpressure falls within the published pressure range forthe ice machine’s operating conditions. It is normal forthe discharge pressure to be higher at the beginning ofthe freeze cycle (when load is greatest), then dropthrough out the freeze cycle.Part Number 80-01111-9 7/10 115
- Page 64 and 65: Step 7 Mix a solution of cleaner an
- Page 66 and 67: Step 20 Use half of the sanitizer/w
- Page 68 and 69: 4. Wait until the Clean light flash
- Page 70 and 71: WATER SHUTTERSThe water shutter is
- Page 72 and 73: SUMP DRAIN OVERFLOW TUBE1. Remove c
- Page 74 and 75: SPRAY BAR, WATER PUMP AND HOSE! War
- Page 76 and 77: ! WarningWear ru bber gloves an d s
- Page 78 and 79: WATER-COOLED ICE MACHINES1. Perform
- 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 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 130 and 131: FINAL ANALYSISThe column with the h
- 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.
ANALYZING DISCHARGE PRESSUREQ130/Q170/Q210/Q270 Ice Machines Only1. Determine the ice machine operating conditions:Air temp. entering condenser ______Air temp. around ice machine ______Water temp. entering sump trough ______2. Refer to “Cycle Times, 24 Hr. Ice Production andRefrigerant Pressure Charts” on page 203 for icemachine being checked.Use the operating conditions determined in step 1 tofind the published normal discharge pressures.Freeze Cycle ______Harvest Cycle ______3. Perform an actual discharge pressure check.FreezeCycle PSIGHarvestCycle PSIGBeginning ofCycle __________ __________Middle ofCycle __________ __________End ofCycle __________ __________4. Compare the actual discharge pressure (step 3)with the published discharge pressure (step 2).The discharge pressure is normal when the actualpressure falls within the published pressure range forthe ice machine’s operating conditions. It is normal forthe discharge pressure to be higher at the beginning ofthe freeze cycle (when load is greatest), then dropthrough out the freeze cycle.Part Number 80-01111-9 7/10 115
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