Hoshizaki KM-630MAH, KM-630MWH, KM-630MRH service manual Controller Board, SOLID-STATE Control

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2. CONTROLLER BOARD

[a] SOLID-STATE CONTROL

1)A HOSHIZAKI exclusive solid-state control is employed in Modular Crescent Cubers.

2)A Printed Circuit Board (hereafter called “Controller Board”) includes a stable and high quality control system.

3)All models are pretested and factory-adjusted.

[b] CONTROLLER BOARD

CAUTION

1.Fragile, handle very carefully.

2.A controller board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit when handling or replacing the board.

3.Do not touch the electronic devices on the board or the back of the board to prevent damage to the board.

4.Do not change wiring and connections. Do not misconnect K3, K4 and K5, because the same connector is used for the Thermistor (white), Float Switch (black), and Mechanical Bin Control (red).

(For machines with thermostat, there is no connection on K4.)

5.Always replace the whole board assembly when it goes bad.

6.Do not short out power supply to test for voltage.

PART NUMBER

TYPE

2A1410-01

HOS-001A (Control Products)

Features of Control Products “E” Controller Board

1) Maximum Water Supply Period - 6 minutes

Water Solenoid Valve opening, in the Defrost (Harvest) Cycle, is limited by the defrost timer. The Water Valve cannot remain open longer than the

maximum period. The Water Valve can close in less than six minutes if the defrost cycle is completed.

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Contents KM-630MAH KM-630MWH KM-630MRH Hoshizaki AMERICA, INC Contents Maintenance Specifications KM-630MAH Water TEMP. F2a. KM-630MWH Serial #L00001D M20270B 2b. KM-630MWH Serial #M20301E KM-630MRH Condenser Unit URC-6FSpecifications II. General Information Construction KM-630MAHKM-630MWH KM-630MRH SOLID-STATE Control Features of Control Products E Controller BoardController Board Controller BoardPage Harvest Cycle Beep every 3 sec. = High Evaporator Temperature 127 FMinute Fill Cycle Freeze CycleControl Products HOS-001A Board Sequence 1st Cycle Important Water Valve opening is limited to 6 minutes2nd Cycle and after with pump drain 2nd Cycle and after with no pump drain Controls and Adjustments For Models with ThermostatPage Setting Time Models with Thermostat Models with Mechanical BIN Control Checking the Controller BoardExplanation of Operation Proximity SwitchMechanical BIN Control Troubleshooting Mechanical BIN Control only KM-630MAH KM-630MWH KM-630MRH Wiring Diagrams Page B1 KM-630MRH with auxiliary codes L-0, M-0, M-1 B2 KM-630MRH with auxiliary codes M-2 and after Timing Chart Page Performance Data 157B1 KM-630MWH Serial #L00001D M20270B Pressure Drop of Cooling Water LineB2 KM-630MWH Serial #M20301E 603 IV. Service Diagnosis 1. no ICE Production Problem Possible Cause RemedyController Board Problem Possible Cause Remedy Evaporator is Frozen UP ThermistorOthers LOW ICE ProductionAbnormal ICE Refrigerant Recovery Removal and Replacement of ComponentsService for Refrigerant Lines Evacuation and Recharge R-404ABrazing Removal and Replacement of Compressor Important Page Removal and Replacement of Drier Removal and Replacement of Expansion ValveRemoval and Replacement of HOT GAS Valve and Line Valve Page Removal and Replacement of Evaporator Important Page Adjustment of Water Regulating Valve WATER-COOLED Model only Page Removal and Replacement of Thermistor Caution Removal and Replacement of FAN Motor Removal and Replacement of Water Valve Removal and Replacement of Pump MotorRemoval and Replacement of Spray Tubes VI. Cleaning and Maintenance Instructions Preparing the Icemaker for Long StoragePage Cleaning and Sanitizing Procedures Cleaning Procedure Page Sanitizing Procedure Maintenance