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Manitowoc QM30 Manual

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8 Part Number 80-0111-9 6/11
Freeze Cycle Is Long, Low Ice
Production . . . . . . . . . . . . . . . . . . . . . 147
Ice Machine Runs and No Ice
Is Produced . . . . . . . . . . . . . . . . . . . . 148
Analyzing Discharge Pressure . . . . . . 149
Discharge Pressure High Checklist . . 150
Freeze Cycle Discharge Pressure Low
Checklist . . . . . . . . . . . . . . . . . . . . . . . 150
Analyzing Suction Pressure . . . . . . . . 151
Hot Gas Valve . . . . . . . . . . . . . . . . . . 154
COMPONENT CHECK PROCEDURES
Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . . 159
Function . . . . . . . . . . . . . . . . . . . . . . . 159
Specifications . . . . . . . . . . . . . . . . . . . 159
Check Procedure . . . . . . . . . . . . . . . . 159
Bin Switch . . . . . . . . . . . . . . . . . . . . . . . . 160
QM45/Q130/Q170/Q210/Q270 . . . . . 160
Bin Thermostat . . . . . . . . . . . . . . . . . . . . 164
QM20/QM30 . . . . . . . . . . . . . . . . . . . . 164
SM50 . . . . . . . . . . . . . . . . . . . . . . . . . 166
Liquid Line Thermistor . . . . . . . . . . . . . . 169
QM20/QM30/SM50 . . . . . . . . . . . . . . . 169
Diagnosing Start Components . . . . . . . . 171
Capacitor . . . . . . . . . . . . . . . . . . . . . . 171
Relay . . . . . . . . . . . . . . . . . . . . . . . . . 171
ON/OFF/WASH Toggle Switch . . . . . . . . 172
Function . . . . . . . . . . . . . . . . . . . . . . . 172
Specifications . . . . . . . . . . . . . . . . . . . 172
Check Procedure . . . . . . . . . . . . . . . . 172
QM45/Q130/Q170/Q210/Q270 . . . . . 173
QM20/QM30 . . . . . . . . . . . . . . . . . . . . 173
Ice Thickness Probe . . . . . . . . . . . . . . . . 174
QM45/Q130/Q170/Q210/Q270 . . . . . 174
Ice Thickness Check . . . . . . . . . . . . . 175
Compressor Electrical Diagnostics . . . . 176
Check Resistance (Ohm) Values . . . . 176
Single Phase Compressors . . . . . . . . 176
Check Motor Windings to Ground . . . 176
Compressor Drawing Locked Rotor . . 177
Compressor Drawing High Amps . . . . 177
Fan Cycle Control . . . . . . . . . . . . . . . . . . 178
QM45/Q130/Q170/Q210/Q270 . . . . . 178
… 8 …


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