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QM20/QM30DIAGNOSING AN ICE MACHINETHAT WILL NOT RUN! WarningHigh (line) voltage is applied to the co ntrol board(terminals #8 and #2 ) at all times. Removin gcontrol board fuse or moving the toggle switch toOFF wil l not remove the powe r supplied to th econtrol board.1. Verify primary voltage is supplied to ice machine.2. Verify that the fuse or circuit breaker is closed.3. Verify control board fuse is OK. If the power lightfunctions, the fuse is OK.4. Verify ICE/OFF/WASH toggle switch functionsproperly. A defective toggle switch may keep theice machine in the OFF mode.5. Verify the bin thermostat functions properly. Adefective bin thermostat can falsely indicate a fullbin of ice.6. Verify low DC voltage is properly grounded. LooseDC wire connections may intermittently stop theice machine.7. Replace the control board.8. Be sure steps 1-6 were followed thoroughly.Intermittent problems are not usually related tothe control board.134 Part Number 80-01111-9 7/10
REFRIGERATION DIAGNOSTICSQM20The QM20 ice machines have a very small refrigerantcharge, 4.59 oz (130 g) and we do not recommenddiagnosing the ice machine using refrigerant pressures. Forthis reason we have not included refrigeration access fittings.Verify that your water flow is even across the entireevaporator before diagnosing the refrigeration system.Mineral build-up on the evaporator assembly can causewater tracking and an erratic ice fill pattern. Clean with<strong>Manitowoc</strong> Ice Machine cleaner to remove any mineral buildupbefore entering the refrigeration system.The following can be used for diagnostics:Capillary Tube failures or low refrigerant charge will alwaysresult in a starving evaporator.Assume 86°F (30°C) air temperature 68°F (20°C) watertemperature.Suction line temperature at the compressor will range from86°F (30°C) three minutes into the cycle to 8°F (-13°C) at theend of the freeze cycle. An obstructed capillary tube or lowrefrigerant charge will have a suction line temperature higherthan normal.Discharge line temperature at the compressor will range from168°F (76°C) to 140°F (60°C) through the freeze cycle. Anobstructed capillary tube or low refrigerant charge will have alower discharge line temperature than normal.Suction line temperature at the compressor will range from64°F (18°C) to 111°F (44°C) through the harvest cycle. Anobstructed capillary tube will not affect suction linetemperature range during the harvest cycle. Low refrigerantcharge will have a lower temperature than normal.Discharge line temperature at the compressor will range from180°F (82°C) to 150°F (60°C) through the harvest cycle. Anobstructed capillary tube will not affect discharge linetemperature range during the harvest cycle. Low refrigerantcharge will have a lower temperature than normal.Ice fill pattern will vary depending on severity of theobstruction or refrigeration loss. Ice fill patterns will rangefrom no ice on the entire evaporator to thin only at theevaporator outlet (thin at the bottom, thick at the top of theevaporator).Part Number 80-01111-9 7/10 135
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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.
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Step 7 Mix a solution of cleaner an
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Step 20 Use half of the sanitizer/w
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4. Wait until the Clean light flash
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WATER SHUTTERSThe water shutter is
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SUMP DRAIN OVERFLOW TUBE1. Remove c
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SPRAY BAR, WATER PUMP AND HOSE! War
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! WarningWear ru bber gloves an d s
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WATER-COOLED ICE MACHINES1. Perform
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HARVEST SEQUENCE5. HarvestThe water
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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 130 and 131: FINAL ANALYSISThe column with the h
Page 132 and 133: Q130/Q170/Q210/Q270 Ice Machines On
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
Page 180 and 181: Filter-DriersLIQUID LINE FILTER DRI
Page 182 and 183: 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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