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Hoshizaki KM-900MRF3, KM-900MAF service manual KM-900MWF

Models: KM-900MAF KM-900MRF3 KM-900MWF KM-900MRF

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2. KM-900MWF

2. KM-900MWF

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Hoshizaki KM-900MRF3, KM-900MAF service manual KM-900MWF

Contents

KM-900MAF KM-900MWF KM-900MRF KM-900MRF3 HOSHIZAKI MODULAR CRESCENT CUBERMODELS HOSHIZAKI AMERICA, INC 618 Highway 74 South Peachtree City, GA Phone 1-800-233-1940 Technical ServiceComplete and detailed explanation of the problem Attn HOSHIZAKI Technical Support DepartmentCONTENTS SERVICE FOR REFRIGERANT LINES IV. SERVICE DIAGNOSISV. REMOVAL AND REPLACEMENT OF COMPONENTS a REFRIGERANT RECOVERYI. SPECIFICATIONS 1. KM-900MAF 2. KM-900MWF 3. KM-900MRF 4. KM-900MRF3 5. CONDENSING UNIT URC-12F SPECIFICATIONS MODEL URC-12F II. GENERAL INFORMATION 1. CONSTRUCTIONa KM-900MAF b KM-900MWF c KM-900MRF d KM-900MRF3 a SOLID-STATE CONTROL Features of Control Products “E” Controller Board2. CONTROLLER BOARD b CONTROLLER BOARD4 Low Water Safety 2 Defrost Timer3 High Temperature Safety - 127 ± 7F 6 LED Lights and Audible Alarm SafetiesHarvest Cycle 1 beep every 3 sec. = High Evaporator Temperature 127 F1 Minute Fill Cycle Freeze CycleControl Products HOS-001A Board c SEQUENCE 1st Cycle IMPORTANT Water Valve opening is limited to 6 minutes2nd Cycle and after with pump drain IMPORTANT Water Valve opening is limited to 6 minutes2nd Cycle and after with no pump drain IMPORTANT Water Valve opening is limited to 6 minutesd CONTROLS AND ADJUSTMENTS i Disconnect the connector K3 on the board Temperature FCheck a thermistor for resistance by using the following procedures 2 Defrost TimerSETTING 3 Drain TimerThe Drain Timer is factory-adjusted, and no adjustment is required Dip Switche CHECKING THE CONTROLLER BOARD At this point, the unit should start the defrost cycle After the 1 minute water supply cycle, the defrost cycle startsIII. TECHNICAL INFORMATION 1. WATER CIRCUIT AND REFRIGERANT CIRCUIT a KM-900MAFb KM-900MWF c KM-900MRF and KM-900MRF3 2. WIRING DIAGRAMS a KM-900MAFCut-out Note Pressure Switchb KM-900MWF 412 ±Cut-out Note Pressure Switchc KM-900MRF 412 ±Cut-out Note Pressure Switchd KM-900MRF3 412 ±3. TIMING CHART If Float Sw. is OFFFrom Defrost Cycle To Defrost Cycle To Freeze Cycle From Freeze Cycle Control4. PERFORMANCE DATA a KM-900MAF b KM-900MWF c KM-900MRF b KM-900MRF3 POSSIBLE CAUSE IV. SERVICE DIAGNOSIS 1. NO ICE PRODUCTIONPROBLEM REMEDYPROBLEM POSSIBLE CAUSEREMEDY PROBLEM POSSIBLE CAUSEREMEDY 2. EVAPORATOR IS FROZEN UP 3. LOW ICE PRODUCTIONa See chart 1 - 3, and check dirty Air Filter or Condenser 4. ABNORMAL ICE 5. OTHERSSolenoid Valve, water system a REFRIGERANT RECOVERY V. REMOVAL AND REPLACEMENT OF COMPONENTS1. SERVICE FOR REFRIGERANT LINES b EVACUATION AND RECHARGE R-404A2. BRAZING DANGER 3. REMOVAL AND REPLACEMENT OF COMPRESSOR IMPORTANT 18 Turn on the power supply 17 Replace the panels in their correct positions4. REMOVAL AND REPLACEMENT OF DRIER 5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE6. REMOVAL AND REPLACEMENT OF HOT GAS VALVE AND LINE VALVE 5 Disconnect the Hot Gas Valve or Line Valve using brazing equipment 1 Turn off the power supply 2 Remove the panels3 Recover the refrigerant and store it in an approved container 6 Install the new valve7. REMOVAL AND REPLACEMENT OF EVAPORATOR IMPORTANT Page 9. ADJUSTMENT OF WATER REGULATING VALVE - WATER-COOLED MODEL ONLY Page Cable Tie 11. REMOVAL AND REPLACEMENT OF THERMISTOR CAUTIONThermistor Lead Foam Insulation12. REMOVAL AND REPLACEMENT OF FAN MOTOR Min. 4-3/4 Liquid Bypass Flow13. REMOVAL AND REPLACEMENT OF WATER VALVE 14. REMOVAL AND REPLACEMENT OF PUMP MOTOR15. REMOVAL AND REPLACEMENT OF SPRAY TUBES VI. MAINTENANCE AND CLEANING INSTRUCTIONS 1. PREPARING THE ICEMAKER FOR LONG STORAGE3 Drain the Potable Water Tank 1 Turn off the power supply 2 Move the Control Switch, on the Control Box, to the “OFF” position7 Move the Control Switch to the “ICE” position 2 Move the Control Switch to the “OFF” position2. CLEANING CLOSED POSITIONOPEN POSITION a CLEANING PROCEDURE b SANITIZING PROCEDURE - Following Cleaning Procedure 3. MAINTENANCE