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System Contamination CleanupGENERALThis section describes the basic requirements forrestoring contaminated systems to reliable service.Important<strong>Manitowoc</strong> Ice assumes no responsibility for theuse of contaminated refrige rant. Damag eresulting from the use of contaminated refrigerantis the sole responsibility of the servicing company.DETERMINING SEVERITY OF CONTAMINATIONSystem contamination is generally caused by eithermoisture or residue from compressor burnout enteringthe refrigeration system.Inspection of the refrigerant usually provides the firstindication of system contamination. Obvious moistureor an acrid odor in the refrigerant indicatescontamination.If either condition is found, or if contamination issuspected, use a Total Test Kit from Totaline or asimilar diagnostic tool. These devices samplerefrigerant, eliminating the need to take an oil sample.Follow the manufacturer’s directions.If a refrigerant test kit indicates harmful levels ofcontamination, or if a test kit is not available, inspectthe compressor oil.1. Remove the refrigerant charge from the icemachine.2. Remove the compressor from the system.3. Check the odor and appearance of the oil.4. Inspect open suction and discharge lines at thecompressor for burnout deposits.5. If no signs of contamination are present, performan acid oil test to determine the type of cleanuprequired.190 Part Number 80-01111-9 7/10
Contamination/Cleanup ChartSymptoms/FindingsNo symptoms or suspicion ofcontaminationMoisture/Air Contamination symptomsRefrigeration system open toatmosphere for longer than 15 minutesRefrigeration test kit and/or acid oil testshows contaminationNo burnout deposits in opencompressor linesMild Compressor Burnout symptomsOil appears clean but smells acridRefrigeration test kit or acid oil testshows harmful acid contentNo burnout deposits in opencompressor linesSevere Compressor Burnout symptomsOil is discolored, acidic, and smellsacridBurnout deposits found in thecompressor, lines, and othercomponentsRequiredCleanupProcedureNormalevacuation/rechargingprocedureMildcontaminationcleanupprocedureMildcontaminationcleanupprocedureSeverecontaminationcleanupprocedurePart Number 80-01111-9 7/10 191
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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
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HARVEST SEQUENCE4. Harvest CycleThe
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SM50INITIAL START-UP OR START-UP AF
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ENERGIZED PARTS CHARTSM50Self-conta
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Water Level CheckThe float valve is
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QM20/QM30Routine adjustments and ma
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5. Remove the two screws holding th
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Clean (Green)Pressing the “Clean
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This Page Intentionally Left Blank9
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DIAGNOSING ICE THICKNESS CONTROLCIR
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Ice Machine Cycles Into Harvest Bef
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INSTALLATION AND VISUAL INSPECTIONC
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ICE FORMATION PATTERNEvaporator ice
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SAFETY LIMIT FEATUREIn addition to
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Safety Limit Notes• A safety limi
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Safety Limit ChecklistThe following
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Safety Limit #2Harvest time exceeds
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Discharge Pressure High ChecklistIm
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ProcedureStep1. Determine the ice m
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Suction Pressure Low ChecklistImpro
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Hot Gas Valve AnalysisThe valve can
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FindingsThe inlet of the harvestval
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DISCHARGE LINE TEMPERATURE ANALYSIS
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REFRIGERATION COMPONENT DIAGNOSTICC
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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
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
Page 184 and 185: RECOVERY AND RECHARGING PROCEDURESQ
Page 186 and 187: NOTE: Manifold gauges must be remov
Page 188 and 189: ImportantManifold gau ges must be r
Page 192 and 193: MILD SYSTEM CONTAMINATION CLEANUPPR
Page 194 and 195: REPLACING PRESSURE CONTROLS WITHOUT
Page 196 and 197: Q270 Condenser Fan Motor Replacemen
Page 198 and 199: MAX. 1300°F(700°C)SV30714. Apply
Page 200 and 201: High Pressure Cutout (HPCO) Control
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Page 204 and 205: QM20 SELF-CONTAINED AIR-COOLEDNOTE:
Page 206 and 207: QM45 SELF-CONTAINED AIR-COOLEDNOTE:
Page 208 and 209: SM50 SELF-CONTAINED AIR-COOLEDNOTE:
Page 210 and 211: Q130 SELF-CONTAINED AIR-COOLED(Afte
Page 212 and 213: Q170 SELF-CONTAINED AIR-COOLEDNOTE:
Page 214 and 215: Q210 SELF-CONTAINED WATER-COOLEDNOT
Page 216 and 217: Q270 SELF-CONTAINED WATER-COOLEDNOT
Page 218 and 219: QM20CAUTION: DISCONNECT POWER BEFOR
Page 220 and 221: QM30230V/1 Ph/50 HzL1CAUTION: DISCO
Page 222 and 223: SM50L1CAUTION: DISCONNECT POWER BEF
Page 224 and 225: Q130/Q170/Q210Danfoss CompressorL1N
Page 226 and 227: Q270Danfoss CompressorL1NOTE: DIAGR
Page 228 and 229: QM45/Q130/Q170/Q210/Q270ICE THICKNE
Page 230 and 231: Tubing SchematicsQM20/QM30 Tubing S
Page 232 and 233: SM50 Tubing SchematicHEATEXCHANGERE
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