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Hoshizaki Iii. Technical Information, WATER CIRCUIT AND REFRIGERANT CIRCUIT a KM-900MAF

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

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III.TECHNICAL INFORMATION

III.TECHNICAL INFORMATION

1.WATER CIRCUIT AND REFRIGERANT CIRCUIT

[a]KM-900MAF

27

Image 27

Hoshizaki KM-900MWF, KM-900MRF3 Iii. Technical Information, WATER CIRCUIT AND REFRIGERANT CIRCUIT a KM-900MAF

Contents

KM-900MAF KM-900MWF KM-900MRF KM-900MRF3 HOSHIZAKI MODULAR CRESCENT CUBERMODELS Attn HOSHIZAKI Technical Support Department Phone 1-800-233-1940 Technical ServiceComplete and detailed explanation of the problem HOSHIZAKI AMERICA, INC 618 Highway 74 South Peachtree City, GACONTENTS a REFRIGERANT RECOVERY IV. SERVICE DIAGNOSISV. REMOVAL AND REPLACEMENT OF COMPONENTS SERVICE FOR REFRIGERANT LINESI. 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 b CONTROLLER BOARD Features of Control Products “E” Controller Board2. CONTROLLER BOARD a SOLID-STATE CONTROL6 LED Lights and Audible Alarm Safeties 2 Defrost Timer3 High Temperature Safety - 127 ± 7F 4 Low Water SafetyFreeze Cycle 1 beep every 3 sec. = High Evaporator Temperature 127 F1 Minute Fill Cycle Harvest 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 2 Defrost Timer Temperature FCheck a thermistor for resistance by using the following procedures i Disconnect the connector K3 on the boardDip Switch 3 Drain TimerThe Drain Timer is factory-adjusted, and no adjustment is required SETTINGe 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 DIAGRAMS412 ± Note Pressure Switchb KM-900MWF Cut-out412 ± Note Pressure Switchc KM-900MRF Cut-out412 ± Note Pressure Switchd KM-900MRF3 Cut-out3. TIMING CHART If Float Sw. is OFFFrom Defrost Cycle To Defrost Cycle Control To Freeze Cycle From Freeze Cycle4. PERFORMANCE DATA a KM-900MAF b KM-900MWF c KM-900MRF b KM-900MRF3 REMEDY IV. SERVICE DIAGNOSIS 1. NO ICE PRODUCTIONPROBLEM POSSIBLE CAUSEPROBLEM 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 b EVACUATION AND RECHARGE R-404A V. REMOVAL AND REPLACEMENT OF COMPONENTS1. SERVICE FOR REFRIGERANT LINES a REFRIGERANT RECOVERY2. 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 6 Install the new valve 1 Turn off the power supply 2 Remove the panels3 Recover the refrigerant and store it in an approved container 5 Disconnect the Hot Gas Valve or Line Valve using brazing equipment7. REMOVAL AND REPLACEMENT OF EVAPORATOR IMPORTANT Page 9. ADJUSTMENT OF WATER REGULATING VALVE - WATER-COOLED MODEL ONLY Page Foam Insulation 11. REMOVAL AND REPLACEMENT OF THERMISTOR CAUTIONThermistor Lead Cable TieMin. 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 INSTRUCTIONS2 Move the Control Switch to the “OFF” position 2 Move the Control Switch, on the Control Box, to the “OFF” position7 Move the Control Switch to the “ICE” position 3 Drain the Potable Water Tank 1 Turn off the power supply2. CLEANING CLOSED POSITIONOPEN POSITION a CLEANING PROCEDURE b SANITIZING PROCEDURE - Following Cleaning Procedure 3. MAINTENANCE