Manuals / Hoshizaki / Kitchen Appliance / Ice Maker

Hoshizaki MRH KM-901MAH, MWH Remote Models MRH/3, Thermostatic Bin Control Bracket & Bulb Holder

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

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3. Remote Models (MRH/3)

3. Remote Models (MRH/3)

Spray Tubes

Inlet Water Valve

Cleaning Valve

Control Switch

Thermostatic

Bin Control

Float Switch

Water Pump Compressor

Thermostatic Bin Control

Bracket & Bulb Holder

Thermostatic

Expansion Valves

Water Supply Inlet

Hot Gas Valve

Junction Boxes

Control Box

Receiver Tank

Drier

Liquid Line Valve

Mechanical Bin Control and Bracket

Model Shown: KM-901MRH

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Hoshizaki MRH KM-901MAH, MWH(-M) Remote Models MRH/3, Spray Tubes Inlet Water Valve Cleaning Valve Control Switch

Contents

Models KM-320MAH, MWH SERVICE MANUALModular Crescent Cuber HoshizakiHoshizaki America, IncE-mail techsupport@hoshizaki.com HOSHIZAKI AMERICA, INC Complete and detailed explanation of the problemPhone 1-800-233-1940 770 Fax 1-800-843-1056 770 618 Highway 74 South Peachtree City, GACONTENTS 7. Freeze Timer S4 dip switch 9 5. Bin Control Selector or Harvest Pump Timer Operation S4 dip switch6. Factory Use S4 dip switch 8. Float Switch Selector S5 dip switch 1 G Control Board2. Diagrams With Harvest Pump Timer Relays C. Wiring Diagrams1. Diagrams Without Harvest Pump Timer Relays a KM-320MH, KM-515MH, KM-600MAHserious injury Important Safety InformationIndicates a hazardous situation which could result in death or Indicates a situation which could result in damage to theWARNING, continued Additional Warning for Remote ModelsA. Construction I. Construction and Water/Refrigeration Circuit Diagram1. Air-Cooled Models MAH 2. Water-Cooled Models MWH-M Model Shown KM-515MWHThermostatic Bin Control Float Switch Water Pump Compressor 3. Remote Models MRH/3Spray Tubes Inlet Water Valve Cleaning Valve Control Switch Thermostatic Bin Control Bracket & Bulb HolderB. Water/Refrigeration Circuit Diagram 1. Air-Cooled Models MAHDischarge Line 2. Water-Cooled Models MWH-MFreeze Pump Out 3. Remote Models MRH/3 Freeze Pump- OutII. Sequence of Operation and ServiceDiagnosis A. Sequence of Operation Flow ChartE and G Control Board Without Harvest Pump Timer Operation Flow Chart Components Energized when the Control Switch is in the WASH PositionShutdown Delay Thermostatic Bin Control Shutdown Sequence Flow ChartMechanical Bin Control Shutdown Sequence Flow Chart 1. Bin FullTimer Operation G Control Board With Harvest Pump Timer Operation Sequence Flow Chart2. G Control Board with Harvest Pump 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 9 Shutdown a E Control Board Thermostatic Bin Control TBC b Mechanical Bin Control2. G Control Board with Harvest Pump Timer Diagnosis 50 sec. before harvest terminates, PM energizes. See step 5b below d WRV Diagnosis Confirm WRV is not leaking byPage For LLV, check coil voltage and continuity Pump-Out G Control Board SettingsS4 Dip Switch Setting G Control Board9 Shutdown Mechanical Bin Control C. Control Board Check D. Bin Control Check 1. Thermostatic Bin Control Check9 Check that CB green BC CLOSED LED is on 4 Check MBC wire harness connections. See Fig5 Disconnect MBC connector from CB K4 connector Legend MBC-mechanical bin control CB-control boardb Mechanical Bin Control Cleaning E. Float Switch Check and Cleaning 1. Float Switch CheckVent Flush Shaft Float Switch Housing Float Retainer Rod Rubber Boot 2. Float Switch Cleaningand Hose F. Thermistor Check 1. No Ice Production G. Diagnostic TablesNo Ice Production - Possible Cause Freeze-Up - Possible Cause 2. Freeze-UpNo Ice Production - Possible Cause Harvest CycleFreeze Cycle 3. Low Ice ProductionFreeze-Up - Possible Cause Low Ice Production - Possible CauseLow Ice Production - Possible Cause Long Freeze CycleIII. Controls and Adjustments 1. E Control Board A. Control Board LayoutE Control Board E Control BoardG Control Board G Control Board2. G Control Board Part Number 2A3792-01B. LED Lights and Audible Alarm Safeties 1. E Control Board2. G Control Board a E and G Control Board without Harvest Pump Timer Operation C. Settings and Adjustments1. Default Dip Switch Settings b G Control Board with Harvest Pump Timer Operation2. Harvest Timer S4 dip switch 1 3. Pump-Out Timer S4 dip switch 34. Pump-Out Frequency Control S4 dip switch 5 1 Bin Control Selector, E Control Board6. Factory Use S4 dip switch 2 Harvest Pump Timer, G Control Board7. Freeze Timer S4 dip switch 9 8. Float Switch Selector S5 dip switch 1 G Control Board D. Control Switch9. Refill Counter S5 dip switch 2 through 5 G Control Board A. Refrigeration Circuit Service Information IV. Refrigeration Circuit and Component Service Information1. Refrigerant Recovery 2. Brazing 3. Evacuation and Recharge R-404A10 Cap the refrigerant access valves to prevent a possible leak B. Component Service Information C. Water Regulating Valve Adjustment water-cooled modelV. Maintenance 1. Remove the water from the icemaker water line VI. Preparing the Appliance for Periods of Non-Use2. Remove the water from the water tank 6 Close the drain valves VII. Disposal 1. KM-320MAH VIII. Technical Information A. Specification Sheetsdesign 2. KM-320MWH design withoutwithout prior 3. KM-515MAHNote We reserve the right to make changes in specifications and designand design 4. KM-515MWHNote We reserve the right to make changes in specifications without prior5. KM-515MRH and design 6. KM-600MAHNote We reserve the right to make changes in specifications without priorwithout prior 7. KM-650MAHNote We reserve the right to make changes in specifications and designNote We reserve the right to make changes in specifications 8. KM-650MWHand design without prior AWAITING DATA 9. KM-650MWH-Mand design 10. KM-650MRHNote We reserve the right to make changes in specifications without prior11. KM-901MAH designand design 12. KM-901MWHNote We reserve the right to make changes in specifications without prior13. KM-901MRH without prior14. KM-901MRH3 without priorAMBIENT TEMP B. Performance Data1. KM-320MAH kg./day2. KM-320MWH 3. KM-515MAH 4. KM-515MWH 5. KM-515MRH 6. KM-600MAH 7. KM-650MAH 8. KM-650MWH AWAITING DATA 9. KM-650MWH-M10. KM-650MRH 11. KM-901MAH 12. KM-901MWH 13. KM-901MRH 14. KM-901MRH3 1. Diagrams Without Harvest Pump Timer Relays C. Wiring Diagramsa KM-320MH, KM-515MH, KM-600MAH Control utputO b KM-650MAH, KM-650MWH, KM-901MAH, KM-901MWHPSIG Transformer 10.5V at115V c KM-650MRH, KM-901MRHPressureSwitch Control OutputControl Transformer Output 10.5V at d KM-901MRH3High-Pressure Switch Cut-outOutput 2. Diagrams With Harvest Pump Timer Relaysa KM-515MAH C ontrolControl Transformer b KM-650MAH, KM-650MWH, KM901MAH Output 10.5V atCut-out c KM-650MWH-MControl Transformer Output 10.5V at High-Pressure Switch 384±Control Transformer High-Pressure Switchd KM-650MRH Output 10.5V at