Hoshizaki KM-650MRH, KM-650MAH, KM-650MWH service manual

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III. Technical Information	23
A. Water Circuit and Refrigeration Circuit	23
1. KM-650MAH (air-cooled)	23
2. KM-650MWH (water-cooled)	24
3. KM-650MRH (remote air-cooled)	25
B. Wiring Diagrams	26
1. KM-650MAH (air-cooled) and KM-650MWH (water-cooled)	26
2. KM-650MRH (remote air-cooled)	27
C. Performance Data	28
1. KM-650MAH (air-cooled)	28
2. KM-650MWH (water-cooled)	29
3. KM-650MRH (remote air-cooled)	30
IV. Service Diagnosis	31
A. 10-Minute KM Diagnostic Procedure	31
B. Diagnostic Charts	32
1. No Ice Production	32
2. Evaporator is Frozen Up	36
3. Low Ice Production	37
4. Abnormal Ice	37
5. Other	37
V. Removal and Replacement of Components	39
A. Service for Refrigerant Lines	39
1. Refrigerant Recovery	39
2. Evacuation and Recharge (R-404A)	39
B. Brazing	40
C. Removal and Replacement of Compressor	40
D. Removal and Replacement of Drier	41
E. Removal and Replacement of Expansion Valve	42
F. Removal and Replacement of Hot Gas Valve and Line Valve	43
G. Removal and Replacement of Evaporator	44
H. Removal and Replacement of Water Regulating Valve - Water Cooled Model Only...	44
I. Adjustment of Water Regulating Valve - Water-Cooled Model Only	45
J. Removal and Replacement of Headmaster (Condensing Pressure Regulator - C.P.R.)
- Remote Air-Cooled Model Only	46
K. Removal and Replacement of Thermistor	47
L. Removal and Replacement of Fan Motor	47
M. Removal and Replacement of Inlet Water Valve	48
N. Removal and Replacement of Pump Motor	48
O. Removal and Replacement of Spray Tubes	49
VI. Cleaning and Maintenance Instructions	50
A. Cleaning and Sanitizing Procedures	50
1. Cleaning Procedure	51
2. Sanitizing Procedure - Following Cleaning Procedure	52
B. Maintenance	52
C. Preparing the Icemaker for Long Storage	53

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Contents KM-650MAH KM-650MWH KM-650MRH Hoshizaki AMERICA, INC Contents Page Specifications Icemaker KM-650MAH air-cooledKM-650MWH water-cooled Water Cooled CondenserKM-650MRH remote air-cooled Condensing Unit URC-5FSpecifications Model URC-5FII. General Information Construction KM-650MWH water-cooled KM-650MRH remote air-cooled Sequence of Operation Cycle Steps Harvest Cycle Freeze Cycle One Minute Control Board Control Board Layout Control Products E Control BoardControl Board Features Maximum Water Supply Period 6 minutesLED Lights and Audible Alarm Safeties Controls and Adjustments Default Dip Switch SettingsHarvest Timer dip switch 1 Pump-Out Frequency Control dip switch 5 Control Board Check Procedure Control Board ReplacementKM-650MAH air-cooled KM-650MWH water-cooled KM-650MRH remote air-cooled Wiring Diagrams KM-650MAH air-cooled and KM-650MWH water-cooledPsig Performance Data 108680 615 IV. Service Diagnosis Minute KM Diagnostic Procedure Diagnostic Charts No Ice ProductionProblem Possible Cause Remedy Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Abnormal Ice Low Ice ProductionOther Problem Possible Cause Remedy Removal and Replacement of Components Service for Refrigerant LinesRefrigerant Recovery Evacuation and Recharge R-404ARemoval and Replacement of Compressor BrazingRemoval and Replacement of Drier Removal and Replacement of Expansion Valve Removal and Replacement of Hot Gas Valve and Line Valve Removal and Replacement of Evaporator Adjustment of Water Regulating Valve Water-Cooled Model Only Page Removal and Replacement of Thermistor Removal and Replacement of Fan MotorRemoval and Replacement of Inlet Water Valve Removal and Replacement of Pump MotorRemoval and Replacement of Spray Tubes VI. Cleaning and Maintenance Instructions Cleaning and Sanitizing ProceduresCleaning Procedure Sanitizing Procedure Following Cleaning Procedure MaintenanceStainless Steel Exterior Preparing the Icemaker for Long Storage Storage Bin and ScoopAir Filters air-cooled models only Condenser air-cooled and remote air-cooled models onlyDrain the potable water supply line Drain the potable water tank

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