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

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

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4. KM-900MRF3

4. KM-900MRF3

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

Contents

MODELS KM-900MAF KM-900MWF KM-900MRF KM-900MRF3HOSHIZAKI MODULAR CRESCENT CUBER Phone 1-800-233-1940 Technical Service Complete and detailed explanation of the problemHOSHIZAKI AMERICA, INC 618 Highway 74 South Peachtree City, GA Attn HOSHIZAKI Technical Support DepartmentCONTENTS IV. SERVICE DIAGNOSIS V. REMOVAL AND REPLACEMENT OF COMPONENTSSERVICE FOR REFRIGERANT LINES 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 a KM-900MAF II. GENERAL INFORMATION1. CONSTRUCTION b KM-900MWF c KM-900MRF d KM-900MRF3 Features of Control Products “E” Controller Board 2. CONTROLLER BOARDa SOLID-STATE CONTROL b CONTROLLER BOARD2 Defrost Timer 3 High Temperature Safety - 127 ± 7F4 Low Water Safety 6 LED Lights and Audible Alarm Safeties1 beep every 3 sec. = High Evaporator Temperature 127 F 1 Minute Fill CycleHarvest 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 Temperature F Check a thermistor for resistance by using the following proceduresi Disconnect the connector K3 on the board 2 Defrost Timer3 Drain Timer The Drain Timer is factory-adjusted, and no adjustment is requiredSETTING 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-900MAFNote Pressure Switch b KM-900MWFCut-out 412 ±Note Pressure Switch c KM-900MRFCut-out 412 ±Note Pressure Switch d KM-900MRF3Cut-out 412 ±From Defrost Cycle To Defrost Cycle 3. TIMING CHARTIf Float Sw. is OFF To Freeze Cycle From Freeze Cycle Control4. PERFORMANCE DATA a KM-900MAF b KM-900MWF c KM-900MRF b KM-900MRF3 IV. SERVICE DIAGNOSIS 1. NO ICE PRODUCTION PROBLEMPOSSIBLE CAUSE REMEDYREMEDY PROBLEMPOSSIBLE CAUSE REMEDY PROBLEMPOSSIBLE CAUSE a See chart 1 - 3, and check dirty Air Filter or Condenser 2. EVAPORATOR IS FROZEN UP3. LOW ICE PRODUCTION Solenoid Valve, water system 4. ABNORMAL ICE5. OTHERS V. REMOVAL AND REPLACEMENT OF COMPONENTS 1. SERVICE FOR REFRIGERANT LINESa REFRIGERANT RECOVERY 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 1 Turn off the power supply 2 Remove the panels 3 Recover the refrigerant and store it in an approved container5 Disconnect the Hot Gas Valve or Line Valve using brazing equipment 6 Install the new valve7. REMOVAL AND REPLACEMENT OF EVAPORATOR IMPORTANT Page 9. ADJUSTMENT OF WATER REGULATING VALVE - WATER-COOLED MODEL ONLY Page 11. REMOVAL AND REPLACEMENT OF THERMISTOR CAUTION Thermistor LeadCable Tie 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 STORAGE2 Move the Control Switch, on the Control Box, to the “OFF” position 7 Move the Control Switch to the “ICE” position3 Drain the Potable Water Tank 1 Turn off the power supply 2 Move the Control Switch to the “OFF” positionOPEN POSITION 2. CLEANINGCLOSED POSITION a CLEANING PROCEDURE b SANITIZING PROCEDURE - Following Cleaning Procedure 3. MAINTENANCE