Manuals / Hoshizaki / Kitchen Appliance / Ice Maker

Hoshizaki MRH KM-901MAH, MWH, MRH/3 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
1. Diagrams Without Harvest Pump Timer Relays	Switch	Cooled-WaterModel	384±22	284±22PSIG
ControlTransformer 10.5VOutputat 115V	Switch	Cooled-WaterModel	384±22	284±22PSIG
a) KM-320M_H, KM-515M_H, KM-600MAH			PSIG
			0
	High* -Pressure	Cooled-Air Model	412±22	327±22PSIG
			PSIG
			0
	*		-out	-in
	*		Cut	Cut
			Cut	Cut
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Hoshizaki MRH KM-901MAH C. Wiring Diagrams, Diagrams Without Harvest Pump Timer Relays, a KM-320MH, KM-515MH, KM-600MAH

Contents

HoshizakiHoshizaki America, Inc SERVICE MANUALModular Crescent Cuber Models KM-320MAH, MWH618 Highway 74 South Peachtree City, GA Complete and detailed explanation of the problemPhone 1-800-233-1940 770 Fax 1-800-843-1056 770 E-mail techsupport@hoshizaki.com HOSHIZAKI AMERICA, INCCONTENTS 8. Float Switch Selector S5 dip switch 1 G Control Board 5. Bin Control Selector or Harvest Pump Timer Operation S4 dip switch6. Factory Use S4 dip switch 7. Freeze Timer S4 dip switch 9a KM-320MH, KM-515MH, KM-600MAH C. Wiring Diagrams1. Diagrams Without Harvest Pump Timer Relays 2. Diagrams With Harvest Pump Timer RelaysIndicates a situation which could result in damage to the Important Safety InformationIndicates a hazardous situation which could result in death or serious injuryAdditional Warning for Remote Models WARNING, continuedI. Construction and Water/Refrigeration Circuit Diagram A. Construction1. Air-Cooled Models MAH Model Shown KM-515MWH 2. Water-Cooled Models MWH-MThermostatic Bin Control Bracket & Bulb Holder 3. Remote Models MRH/3Spray Tubes Inlet Water Valve Cleaning Valve Control Switch Thermostatic Bin Control Float Switch Water Pump Compressor1. Air-Cooled Models MAH B. Water/Refrigeration Circuit Diagram2. Water-Cooled Models MWH-M Discharge LineFreeze Pump Out Freeze Pump- Out 3. Remote Models MRH/3Components Energized when the Control Switch is in the WASH Position A. Sequence of Operation Flow ChartE and G Control Board Without Harvest Pump Timer Operation Flow Chart II. Sequence of Operation and ServiceDiagnosis1. Bin Full Thermostatic Bin Control Shutdown Sequence Flow ChartMechanical Bin Control Shutdown Sequence Flow Chart Shutdown DelayComponents Energized when the Control Switch is in the WASH Position G Control Board With Harvest Pump Timer Operation Sequence Flow Chart2. G Control Board with Harvest Pump Timer OperationB. 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 G Control Board G Control Board SettingsS4 Dip Switch Setting Pump-Out9 Shutdown Mechanical Bin Control C. Control Board Check 1. Thermostatic Bin Control Check D. Bin Control CheckLegend MBC-mechanical bin control CB-control board 4 Check MBC wire harness connections. See Fig5 Disconnect MBC connector from CB K4 connector 9 Check that CB green BC CLOSED LED is onb Mechanical Bin Control Cleaning 1. Float Switch Check E. Float Switch Check and Cleaning2. Float Switch Cleaning Vent Flush Shaft Float Switch Housing Float Retainer Rod Rubber Bootand Hose F. Thermistor Check G. Diagnostic Tables 1. No Ice ProductionNo Ice Production - Possible Cause Harvest Cycle 2. Freeze-UpNo Ice Production - Possible Cause Freeze-Up - Possible CauseLow Ice Production - Possible Cause 3. Low Ice ProductionFreeze-Up - Possible Cause Freeze CycleLong Freeze Cycle Low Ice Production - Possible CauseIII. Controls and Adjustments E Control Board A. Control Board LayoutE Control Board 1. E Control BoardPart Number 2A3792-01 G Control Board2. G Control Board G Control Board1. E Control Board B. LED Lights and Audible Alarm Safeties2. G Control Board b G Control Board with Harvest Pump Timer Operation C. Settings and Adjustments1. Default Dip Switch Settings a E and G Control Board without 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 52 Harvest Pump Timer, G Control Board 6. Factory Use S4 dip switch7. Freeze Timer S4 dip switch 9 D. Control Switch 8. Float Switch Selector S5 dip switch 1 G Control Board9. Refill Counter S5 dip switch 2 through 5 G Control Board IV. Refrigeration Circuit and Component Service Information A. Refrigeration Circuit Service Information1. Refrigerant Recovery 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 VI. Preparing the Appliance for Periods of Non-Use 1. Remove the water from the icemaker water line2. Remove the water from the water tank 6 Close the drain valves VII. Disposal VIII. Technical Information A. Specification Sheets 1. KM-320MAHdesign design without 2. KM-320MWHdesign 3. KM-515MAHNote We reserve the right to make changes in specifications and without priorwithout prior 4. KM-515MWHNote We reserve the right to make changes in specifications and design5. KM-515MRH without prior 6. KM-600MAHNote We reserve the right to make changes in specifications and designdesign 7. KM-650MAHNote We reserve the right to make changes in specifications and without prior8. KM-650MWH Note We reserve the right to make changes in specificationsand design without prior 9. KM-650MWH-M AWAITING DATAwithout prior 10. KM-650MRHNote We reserve the right to make changes in specifications and designdesign 11. KM-901MAHwithout prior 12. KM-901MWHNote We reserve the right to make changes in specifications and designwithout prior 13. KM-901MRHwithout prior 14. KM-901MRH3kg./day B. Performance Data1. KM-320MAH AMBIENT TEMP2. 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 C. Wiring Diagrams 1. Diagrams Without Harvest Pump Timer Relaysa KM-320MH, KM-515MH, KM-600MAH b KM-650MAH, KM-650MWH, KM-901MAH, KM-901MWH Control utputOPSIG Control Output c KM-650MRH, KM-901MRHPressureSwitch Transformer 10.5V at115VCut-out d KM-901MRH3High-Pressure Switch Control Transformer Output 10.5V atC ontrol 2. Diagrams With Harvest Pump Timer Relaysa KM-515MAH OutputOutput 10.5V at b KM-650MAH, KM-650MWH, KM901MAH Control Transformer384± c KM-650MWH-MControl Transformer Output 10.5V at High-Pressure Switch Cut-outOutput 10.5V at High-Pressure Switchd KM-650MRH Control Transformer

C. Wiring Diagrams

1. Diagrams Without Harvest Pump Timer Relays

a) KM-320M_H, KM-515M_H, KM-600MAH