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ICE MAKINGSEQUENCE OFOPERATIONHarvestSequence5. HarvestAutomaticShut-off6. Auto Shut-offControl Board Relays1Water Pump2Hot GasValve3RelayCoiloffononoffoffoffRelay3ACompressor3BCondenserFan Motor*ononoffoffLength ofTimeBin switchactivationUntil binswitchre-closes82 Part Number 80-01111-9 7/10
QM20/QM30INITIAL START-UP OR START-UP AFTERAUTOMATIC SHUT-OFF1. Water PurgeThe water fill valve and the hot gas valve areenergized for 2.9 minutes (175 seconds). This ensuresthat the ice making cycle starts with fresh water, andthat the refrigerant pressures are equalized prior torefrigeration system start-up.2. Refrigeration System Start-upThe compressor starts 2.9 minutes (175 seconds)after the water fill valve and hot gas valve areenergized. (The water fill valve and hot gas valveremain energized for 5 seconds during compressorstart-up, and then shut off.) The compressor remainson throughout the entire freeze and harvest cycles.FREEZE SEQUENCE3. Freeze CycleThe condenser fan motor and water pump areenergized and remain on throughout the entire freezecycle. An even flow of water is directed across theevaporator and into each cube cell, where it freezes.The control system automatically determines thelength of the freeze cycle by monitoring thetemperature of the refrigeration system liquid line.Part Number 80-01111-9 7/10 83
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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
Page 32 and 33: COOLING TOWER APPLICATIONSWater Coo
Page 34 and 35: QM20/QM30LocationIce MakingWater In
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Page 38 and 39: ON/OFF/WASHTOGGLESWITCHCONDENSER AI
Page 40 and 41: ON/OFF/WASHTOGGLESWITCHQM20 Ice Mac
Page 42 and 43: WATERPUMPEVAPORATORWATERSHUTTERASSE
Page 44 and 45: AIR-COOLED CONDENSERA dirty condens
Page 46 and 47: Step 1 Set the toggle switch to the
Page 48 and 49: D. Remove the Ice Thickness Probe
Page 50 and 51: Disassembly• Twist both of the in
Page 52 and 53: F. Remove the Float Valve• Turn t
Page 54 and 55: H. Remove the ice damper.Q130• Gr
Page 56 and 57: I. Remove the Bin Door• Grasp the
Page 58 and 59: Step 12 Use 1/2 of the sanitizer/wa
Page 60 and 61: QM20/QM30CLEANING AND SANITIZING PR
Page 62 and 63: 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 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
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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 130 and 131: FINAL ANALYSISThe column with the h
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Q130/Q170/Q210/Q270 Ice Machines On
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QM20/QM30DIAGNOSING AN ICE MACHINET
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QM30The QM30 ice machines have a ve
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Ice Production CheckThe QM20/QM30 d
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REFRIGERATION DIAGNOSTICSImportant:
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5. Install thermometer thermocouple
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SM50DIAGNOSING AN ICE MACHINETHAT W
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ICE QUALITY IS POOR — CUBES ARE S
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ICE MACHINE RUNS AND NO ICE IS PROD
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DISCHARGE PRESSURE HIGH CHECKLISTIm
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ProcedureStep1. Determine the ice m
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Other• Non-Manitowoc components i
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FindingsThe inlet of the harvestval
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ADJUSTING CUBE WEIGHTThe cube weigh
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Bin SwitchQM45/Q130/Q170/Q210/Q270F
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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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