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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-<strong>Manitowoc</strong> 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
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ManitowocQM20/QM30/QM45SM50Q130/Q17
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Read These Before Proceeding:! Caut
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Cleaning the Condenser . . . . . .
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Freeze Cycle Is Long, Low Ice Produ
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CHARTSCycle Times, 24 Hr. Ice Produ
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How to Read a Model NumberCube Size
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Model/Serial Number LocationThe mod
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SM50MODEL/SERIALNUMBER PLATE16 Part
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LaborQ130/Q170/Q210/Q2701. Labor re
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RESIDENTIAL WARRANTY COVERAGEWhat D
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How State Law AppliesThis limited w
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Ice Machine Clearance RequirementsS
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SM50/QM20/QM30After moving the ice
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Electrical SpecificationsQ130/Q170/
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QM20/QM30/QM45 Air-cooled Ice Machi
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COOLING TOWER APPLICATIONSWater Coo
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QM20/QM30LocationIce MakingWater In
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This Page Intentionally Left Blank3
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ON/OFF/WASHTOGGLESWITCHCONDENSER AI
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ON/OFF/WASHTOGGLESWITCHQM20 Ice Mac
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WATERPUMPEVAPORATORWATERSHUTTERASSE
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AIR-COOLED CONDENSERA dirty condens
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Step 1 Set the toggle switch to the
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D. Remove the Ice Thickness Probe
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Disassembly• Twist both of the in
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F. Remove the Float Valve• Turn t
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H. Remove the ice damper.Q130• Gr
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I. Remove the Bin Door• Grasp the
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Step 12 Use 1/2 of the sanitizer/wa
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QM20/QM30CLEANING AND SANITIZING PR
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Step 6 Remove parts for cleaning.A.
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.
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Bin ThermostatQM20/QM30FunctionThe
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SM50FunctionThe bin thermostat stop
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Check Procedure! WarningHigh (line)
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Temperature/Resistance ChartAs the
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ON/OFF/WASH Toggle SwitchFUNCTIONTh
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Ice Thickness ProbeQM45/Q130/Q170/Q
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Compressor Electrical DiagnosticsTh
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Fan Cycle ControlQM45/Q130/Q170/Q21
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Filter-DriersLIQUID LINE FILTER DRI
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REFRIGERANT RE-USE POLICYManitowoc
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RECOVERY AND RECHARGING PROCEDURESQ
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NOTE: Manifold gauges must be remov
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ImportantManifold gau ges must be r
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System Contamination CleanupGENERAL
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MILD SYSTEM CONTAMINATION CLEANUPPR
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REPLACING PRESSURE CONTROLS WITHOUT
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Q270 Condenser Fan Motor Replacemen
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MAX. 1300°F(700°C)SV30714. Apply
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High Pressure Cutout (HPCO) Control
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QM20 SELF-CONTAINED AIR-COOLEDNOTE:
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QM45 SELF-CONTAINED AIR-COOLEDNOTE:
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SM50 SELF-CONTAINED AIR-COOLEDNOTE:
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Q130 SELF-CONTAINED AIR-COOLED(Afte
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Q170 SELF-CONTAINED AIR-COOLEDNOTE:
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Q210 SELF-CONTAINED WATER-COOLEDNOT
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Q270 SELF-CONTAINED WATER-COOLEDNOT
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QM20CAUTION: DISCONNECT POWER BEFOR
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QM30230V/1 Ph/50 HzL1CAUTION: DISCO
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SM50L1CAUTION: DISCONNECT POWER BEF
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Q130/Q170/Q210Danfoss CompressorL1N
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Q270Danfoss CompressorL1NOTE: DIAGR
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QM45/Q130/Q170/Q210/Q270ICE THICKNE
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Tubing SchematicsQM20/QM30 Tubing S
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SM50 Tubing SchematicHEATEXCHANGERE
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