Manuals / Hoshizaki / Kitchen Appliance / Ice Maker

Hoshizaki MRH KM-600MAH KM-650MAH C. Wiring Diagrams, Diagrams Without Harvest Pump Timer Relays

Models: KM-320MAH MRH KM-600MAH KM-650MAH MWH(-M) MRH KM-901MAH MRH/3 MWH KM-515MAH MWH

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C. Wiring Diagrams	87
1. Diagrams Without Harvest Pump Timer Relays	87
a) KM-320M_H, KM-515M_H, KM-600MAH	87
b) KM-650MAH, KM-650MWH, KM-901MAH, KM-901MWH	88
c) KM-650MRH, KM-901MRH	89
d) KM-901MRH3	90
2. Diagrams With Harvest Pump Timer Relays	91
a) KM-515MAH	91
b) KM-650MAH, KM-650MWH, KM-901MAH	92
c) KM-650MWH-M	93
d) KM-650MRH	94

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Hoshizaki MRH KM-600MAH KM-650MAH C. Wiring Diagrams, Diagrams Without Harvest Pump Timer Relays, c KM-650MRH, KM-901MRH

Contents

Modular Crescent Cuber SERVICE MANUALModels KM-320MAH, MWH HoshizakiHoshizaki America, IncPhone 1-800-233-1940 770 Fax 1-800-843-1056 770 Complete and detailed explanation of the problemE-mail techsupport@hoshizaki.com HOSHIZAKI AMERICA, INC 618 Highway 74 South Peachtree City, GACONTENTS 6. Factory Use S4 dip switch 5. Bin Control Selector or Harvest Pump Timer Operation S4 dip switch7. Freeze Timer S4 dip switch 9 8. Float Switch Selector S5 dip switch 1 G Control Board1. Diagrams Without Harvest Pump Timer Relays C. Wiring Diagrams2. Diagrams With Harvest Pump Timer Relays a KM-320MH, KM-515MH, KM-600MAHIndicates a hazardous situation which could result in death or Important Safety Informationserious injury Indicates a situation which could result in damage to theAdditional Warning for Remote Models WARNING, continued1. Air-Cooled Models MAH I. Construction and Water/Refrigeration Circuit DiagramA. Construction Model Shown KM-515MWH 2. Water-Cooled Models MWH-MSpray Tubes Inlet Water Valve Cleaning Valve Control Switch 3. Remote Models MRH/3Thermostatic Bin Control Float Switch Water Pump Compressor Thermostatic Bin Control Bracket & Bulb Holder1. Air-Cooled Models MAH B. Water/Refrigeration Circuit DiagramFreeze Pump Out 2. Water-Cooled Models MWH-MDischarge Line Freeze Pump- Out 3. Remote Models MRH/3E and G Control Board Without Harvest Pump Timer Operation Flow Chart A. Sequence of Operation Flow ChartII. Sequence of Operation and ServiceDiagnosis Components Energized when the Control Switch is in the WASH PositionMechanical Bin Control Shutdown Sequence Flow Chart Thermostatic Bin Control Shutdown Sequence Flow ChartShutdown Delay 1. Bin Full2. G Control Board with Harvest Pump G Control Board With Harvest Pump Timer Operation Sequence Flow ChartTimer Operation Components Energized when the Control Switch is in the WASH PositionB. Service Diagnosis 1. E and G Control Board without Harvest Pump Timer Diagnosis If energized, replace CB. If de-energized and bypassing, replace LLV a Freeze Cycle Diagnosis Confirm Comp and FMR continue. Confirm that For LLV, check coil voltage and continuity CB K1 #5 DBU to neutral W. If 115VAC is not present, replace CB b Mechanical Bin Control 9 Shutdown a E Control Board Thermostatic Bin Control TBC2. G Control Board with Harvest Pump Timer Diagnosis d WRV Diagnosis Confirm WRV is not leaking by 50 sec. before harvest terminates, PM energizes. See step 5b belowPage For LLV, check coil voltage and continuity S4 Dip Switch Setting G Control Board SettingsPump-Out G Control Board9 Shutdown Mechanical Bin Control C. Control Board Check 1. Thermostatic Bin Control Check D. Bin Control Check5 Disconnect MBC connector from CB K4 connector 4 Check MBC wire harness connections. See Fig9 Check that CB green BC CLOSED LED is on Legend MBC-mechanical bin control CB-control boardb Mechanical Bin Control Cleaning 1. Float Switch Check E. Float Switch Check and Cleaningand Hose 2. Float Switch CleaningVent Flush Shaft Float Switch Housing Float Retainer Rod Rubber Boot F. Thermistor Check No Ice Production - Possible Cause G. Diagnostic Tables1. No Ice Production No Ice Production - Possible Cause 2. Freeze-UpFreeze-Up - Possible Cause Harvest CycleFreeze-Up - Possible Cause 3. Low Ice ProductionFreeze Cycle Low Ice Production - Possible CauseLong Freeze Cycle Low Ice Production - Possible CauseIII. Controls and Adjustments E Control Board A. Control Board Layout1. E Control Board E Control Board2. G Control Board G Control BoardG Control Board Part Number 2A3792-011. E Control Board B. LED Lights and Audible Alarm Safeties2. G Control Board 1. Default Dip Switch Settings C. Settings and Adjustmentsa E and G Control Board without Harvest Pump Timer Operation b G Control Board with Harvest Pump Timer Operation3. Pump-Out Timer S4 dip switch 3 2. Harvest Timer S4 dip switch 11 Bin Control Selector, E Control Board 4. Pump-Out Frequency Control S4 dip switch 57. Freeze Timer S4 dip switch 9 2 Harvest Pump Timer, G Control Board6. Factory Use S4 dip switch 9. Refill Counter S5 dip switch 2 through 5 G Control Board D. Control Switch8. Float Switch Selector S5 dip switch 1 G Control Board 1. Refrigerant Recovery IV. Refrigeration Circuit and Component Service InformationA. Refrigeration Circuit Service Information 3. Evacuation and Recharge R-404A 2. Brazing10 Cap the refrigerant access valves to prevent a possible leak C. Water Regulating Valve Adjustment water-cooled model B. Component Service InformationV. Maintenance 2. Remove the water from the water tank VI. Preparing the Appliance for Periods of Non-Use1. Remove the water from the icemaker water line 6 Close the drain valves VII. Disposal design VIII. Technical Information A. Specification Sheets1. KM-320MAH design without 2. KM-320MWHNote We reserve the right to make changes in specifications and 3. KM-515MAHwithout prior designNote We reserve the right to make changes in specifications 4. KM-515MWHand design without prior5. KM-515MRH Note We reserve the right to make changes in specifications 6. KM-600MAHand design without priorNote We reserve the right to make changes in specifications and 7. KM-650MAHwithout prior designand design without prior 8. KM-650MWHNote We reserve the right to make changes in specifications 9. KM-650MWH-M AWAITING DATANote We reserve the right to make changes in specifications 10. KM-650MRHand design without priordesign 11. KM-901MAHNote We reserve the right to make changes in specifications 12. KM-901MWHand design without priorwithout prior 13. KM-901MRHwithout prior 14. KM-901MRH31. KM-320MAH B. Performance DataAMBIENT TEMP kg./day2. KM-320MWH 3. KM-515MAH 4. KM-515MWH 5. KM-515MRH 6. KM-600MAH 7. KM-650MAH 8. KM-650MWH 9. KM-650MWH-M AWAITING DATA10. KM-650MRH 11. KM-901MAH 12. KM-901MWH 13. KM-901MRH 14. KM-901MRH3 a KM-320MH, KM-515MH, KM-600MAH C. Wiring Diagrams1. Diagrams Without Harvest Pump Timer Relays PSIG b KM-650MAH, KM-650MWH, KM-901MAH, KM-901MWHControl utputO PressureSwitch c KM-650MRH, KM-901MRHTransformer 10.5V at115V Control OutputHigh-Pressure Switch d KM-901MRH3Control Transformer Output 10.5V at Cut-outa KM-515MAH 2. Diagrams With Harvest Pump Timer RelaysOutput C ontrol901MAH b KM-650MAH, KM-650MWH, KMControl Transformer Output 10.5V atControl Transformer Output 10.5V at High-Pressure Switch c KM-650MWH-MCut-out 384±d KM-650MRH High-Pressure SwitchControl Transformer Output 10.5V at