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Hoshizaki KM-900MWF, KM-900MAF service manual c KM-900MRF and KM-900MRF3

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

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[c] KM-900MRF and KM-900MRF3

[c] KM-900MRF and KM-900MRF3

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Hoshizaki KM-900MWF, KM-900MAF service manual c KM-900MRF and KM-900MRF3

Contents

MODELS KM-900MAF KM-900MWF KM-900MRF KM-900MRF3HOSHIZAKI MODULAR CRESCENT CUBER Complete and detailed explanation of the problem Phone 1-800-233-1940 Technical ServiceHOSHIZAKI AMERICA, INC 618 Highway 74 South Peachtree City, GA Attn HOSHIZAKI Technical Support DepartmentCONTENTS V. REMOVAL AND REPLACEMENT OF COMPONENTS IV. SERVICE DIAGNOSISSERVICE 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 2. CONTROLLER BOARD Features of Control Products “E” Controller Boarda SOLID-STATE CONTROL b CONTROLLER BOARD3 High Temperature Safety - 127 ± 7F 2 Defrost Timer4 Low Water Safety 6 LED Lights and Audible Alarm Safeties1 Minute Fill Cycle 1 beep every 3 sec. = High Evaporator Temperature 127 FHarvest Cycle Freeze CycleControl Products HOS-001A Board IMPORTANT Water Valve opening is limited to 6 minutes c SEQUENCE 1st CycleIMPORTANT Water Valve opening is limited to 6 minutes 2nd Cycle and after with pump drainIMPORTANT Water Valve opening is limited to 6 minutes 2nd Cycle and after with no pump draind CONTROLS AND ADJUSTMENTS Check a thermistor for resistance by using the following procedures Temperature Fi Disconnect the connector K3 on the board 2 Defrost TimerThe Drain Timer is factory-adjusted, and no adjustment is required 3 Drain TimerSETTING Dip Switche CHECKING THE CONTROLLER BOARD After the 1 minute water supply cycle, the defrost cycle starts At this point, the unit should start the defrost cycle1. WATER CIRCUIT AND REFRIGERANT CIRCUIT a KM-900MAF III. TECHNICAL INFORMATIONb KM-900MWF c KM-900MRF and KM-900MRF3 a KM-900MAF 2. WIRING DIAGRAMSb KM-900MWF Note Pressure SwitchCut-out 412 ±c KM-900MRF Note Pressure SwitchCut-out 412 ±d KM-900MRF3 Note Pressure SwitchCut-out 412 ±From Defrost Cycle To Defrost Cycle 3. TIMING CHARTIf Float Sw. is OFF Control To Freeze Cycle From Freeze Cycle4. PERFORMANCE DATA a KM-900MAF b KM-900MWF c KM-900MRF b KM-900MRF3 PROBLEM IV. SERVICE DIAGNOSIS 1. NO ICE PRODUCTIONPOSSIBLE 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 1. SERVICE FOR REFRIGERANT LINES V. REMOVAL AND REPLACEMENT OF COMPONENTSa REFRIGERANT RECOVERY b EVACUATION AND RECHARGE R-404A2. BRAZING DANGER 3. REMOVAL AND REPLACEMENT OF COMPRESSOR IMPORTANT 17 Replace the panels in their correct positions 18 Turn on the power supply5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE 4. REMOVAL AND REPLACEMENT OF DRIER6. REMOVAL AND REPLACEMENT OF HOT GAS VALVE AND LINE VALVE 3 Recover the refrigerant and store it in an approved container 1 Turn off the power supply 2 Remove the panels5 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 Thermistor Lead 11. REMOVAL AND REPLACEMENT OF THERMISTOR CAUTIONCable Tie Foam InsulationMin. 4-3/4 Liquid Bypass Flow 12. REMOVAL AND REPLACEMENT OF FAN MOTOR14. REMOVAL AND REPLACEMENT OF PUMP MOTOR 13. REMOVAL AND REPLACEMENT OF WATER VALVE15. REMOVAL AND REPLACEMENT OF SPRAY TUBES 1. PREPARING THE ICEMAKER FOR LONG STORAGE VI. MAINTENANCE AND CLEANING INSTRUCTIONS7 Move the Control Switch to the “ICE” position 2 Move the Control Switch, on the Control Box, to the “OFF” 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