Manitowoc
Manitowoc Manitowoc
DISCHARGE PRESSURE HIGH CHECKLISTImproper Installation• Refer to“Installation and Visual InspectionChecklist” on page 104.Restricted Condenser Air Flow• High inlet air temperature• Condenser discharge air re-circulation• Dirty condenser fins• Defective fan motorImproper Refrigerant Charge• Overcharged• Non-condensable in system• Wrong type of refrigerantOther• Non-Manitowoc components in system• High side refrigerant lines/component restricted(before mid-condenser)FREEZE CYCLE DISCHARGE PRESSURE LOWCHECKLISTImproper Installation• Refer to “Installation and Visual InspectionChecklist” on page 104.Improper Refrigerant Charge• Undercharged• Wrong type of refrigerantOther• Non-Manitowoc components in system• High side refrigerant lines/component restricted(after condenser)• Ambient temperature too lowNOTE: Do not limit your diagnosis to only the itemslisted in the checklists.150 Part Number 80-01111-9 7/10
ANALYZING SUCTION PRESSUREThe suction pressure gradually drops throughout thefreeze cycle. The actual suction pressure (and droprate) changes as the air and water temperatureentering the ice machine changes. These variablesalso determine the freeze cycle times.To analyze and identify the proper suction pressuredrop throughout the freeze cycle, compare thepublished suction pressure to the published freezecycle time.NOTE: Analyze discharge pressure before analyzingsuction pressure. High or low discharge pressure maybe causing high or low suction pressure.Part Number 80-01111-9 7/10 151
- 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 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 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 190 and 191: System Contamination CleanupGENERAL
- 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
DISCHARGE PRESSURE HIGH CHECKLISTImproper Installation• Refer to“Installation and Visual InspectionChecklist” on page 104.Restricted Condenser Air Flow• High inlet air temperature• Condenser discharge air re-circulation• Dirty condenser fins• Defective fan motorImproper Refrigerant Charge• Overcharged• Non-condensable in system• Wrong type of refrigerantOther• Non-<strong>Manitowoc</strong> components in system• High side refrigerant lines/component restricted(before mid-condenser)FREEZE CYCLE DISCHARGE PRESSURE LOWCHECKLISTImproper Installation• Refer to “Installation and Visual InspectionChecklist” on page 104.Improper Refrigerant Charge• Undercharged• Wrong type of refrigerantOther• Non-<strong>Manitowoc</strong> components in system• High side refrigerant lines/component restricted(after condenser)• Ambient temperature too lowNOTE: Do not limit your diagnosis to only the itemslisted in the checklists.150 Part Number 80-01111-9 7/10
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