Hoshizaki Understanding the Sequence of Operation for Ice Machines
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2. SEQUENCE OF OPERATION

The steps in the sequence are as outlined below. When power is supplied, a 5 second delay occurs at startup. Note that the order of the LEDs from the outer edge of the board is 5, 6, 8, 9, 4, 7.

[a] ONE MINUTE FILL CYCLE

LED 8 is on. HWV opens and the fill period begins. After 1 minute, the board checks for a closed LF/S. If LF/S is closed, the harvest cycle begins. If not, HWV will remain energized through additional 1 minute cycles until water enters the sump and LF/S closes. This serves as a low water safety to protect the water pump.

[b] INITIAL HARVEST CYCLE

LEDs 5, 6, and 8 are on. HWV remains open, Comp energizes, HGV opens, and harvest begins. As the evaporator warms, the thermistor located on the suction line checks for a 9°C temperature. When 9°C is reached, a 3.9 k signal turns the harvest over to the adjustable harvest timer which is factory set for normal conditions. The timer has settings of 60, 90, 120, and 180 seconds (S1 dip switch 1 & 2). When the harvest timer completes its count down, the harvest cycle is complete and the freeze cycle starts.

The minimum total time allowed by the board for a complete harvest cycle is 2 minutes. HWV is open during harvest for a maximum of 6 minutes or the length of harvest minus 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter. LED 8 goes off when HWV closes. PM energizes and runs for the last 0, 10, 30, or 50 seconds of harvest depending on S1 dip switch 7 & 8 setting. LED 7 comes on when PM energizes. At the end of harvest, the control board checks the position of LF/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute fill if it is open.

[c] FREEZE CYCLE

LEDs 5 & 7 are on. Comp continues to run, PM and FMS energize, HGV closes and the freeze cycle starts. For the first 5 minutes after the thermistor temperature reaches 2°C, the control board will not accept a signal from LF/S and UF/S. This minimum freeze period acts as a short cycle protection. At the end of this period, LF/S and UF/S assumes control. As ice builds on the evaporator the water level in the sump lowers and LF/S opens, FWV opens (LED 9 is on when FWV is open). The refill will last until UF/S closes or for 60 seconds, whichever is shorter. After UF/S closes, FWV closes 3 seconds later. KMD-410 refills 1 time. After the refill, the freeze continues until LF/S opens again and terminates ice production.

[d] DRAIN CYCLE

LEDs 4, 5, 6, and 7 are on. Comp continues to run, HGV opens, FMS de-energizes. PM stops for 2 seconds, DV energizes, then restarts to take water from the sump and force it through DV and down the drain. When the drain timer stops counting, the drain is complete. The drain timer is 10 or 20 seconds (S1 dip switch 3 & 4). Drain cycle always occurs on the 2nd harvest after startup. Then, depending on the control board setting, drain cycle occurs every cycle, or every 2nd, 5th, or 10th cycles (S1 dip switch 5 & 6).

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Contents Page Page Contents Page KMD-410MAH air-cooled SpecificationsWater Cooled Condenser KMD-410MWH water-cooledKMD-410MAH II. General Information ConstructionKMD-410MWH ONE Minute Fill Cycle Sequence of OperationInitial Harvest Cycle Freeze CycleNormal Harvest Cycle KMD-410MAH, 410MWH Control Board Control Board Layout Harvest Backup Timer and Freeze Timer Features Maximum Water Supply Period 6 minutesHigh Temperature Safety Low Water SafetySequence of Operation LED Lights and Audible Alarm SafetiesHarvest Timer S1 dip switch 1 Controls and Adjustments Default Dip Switch SettingsDrain Timer S1 dip switch 3 Drain Frequency Control S1 dip switch 5Water Saver Timer S1 dip switch 7 Freeze Timer S1 dip switch 9 Pump-Out Pump Motor Delay S2 dip switchFactory Use S2 dip switch 5 Program Ver .5 or earlier Refill Counter S2 dip switch 3 Program Ver .1, Ver Anti-Slush Control S2 dip switch 6 Program Ver Control Board Replacement Control Board Check ProcedureHarvest Control Thermistor Cleaning Float SwitchFloat Switch Check Procedure Explanation of OperationBIN Control BIN Control Check ProcedureSwitches Control SwitchService Switch Page Magnetic contactor wiring depends on the contactor model Wiring DiagramTiming Chart148 Performance Data440 IV. Service Diagnosis Minute Diagnostic Procedure Page No ICE Production Diagnostic ChartsPage See II . d Control Board Check Procedure Evaporator is Frozen UP Abnormal ICE LOW ICE ProductionOther Removal and Replacement Service for Refrigerant Lines Evacuation, Vacuum Pump and Refrigerant Charge R404A Refrigerant RecoveryRefrigerant Leak Check Evacuation and RechargeBrazing Compressor Drier HOT GAS Valve Expansion Valve Evaporator Water Regulating Valve WATER-COOLED Model only FAN Motor Adjustment of Water Regulating Valve WATER-COOLED Model onlyPump Motor Water Valve Drain VALVE, Cleaning ValveWater Tank Float Switch BIN Control Switch Thermistor Control BOX Push Buttons Fuse Control & Service SwitchFuse Holder Control BoardStarter Spray TUBE, Water Supply TUBE, Spray GuideRUN Capacitor Start CapacitorTabs Hose Band Water Supply Tube Under Spray Tube Cleaning Procedure VI. Cleaning and Maintenance InstructionsPage Page Sanitizing Procedure Following Cleaning Procedure MaintenanceStainless Steel Exterior Preparing the Icemaker for Long StorageStorage BIN and Scoop AIR Filters AIR-COOLED Model onlyDrain the water tank Remove the water from the icemaker water supply line
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KMD-410MWH, KMD-410MAH specifications

The Hoshizaki KMD-410MWH and KMD-410MAH are premier ice makers, designed for commercial establishments that require high-efficiency ice production. These units stand out for their advanced features and technology that cater to the diverse needs of restaurants, bars, and hotels.

One of the primary features of the KMD-410 lineup is its impressive ice production capacity. With a production rate of up to 410 pounds of cube ice in a 24-hour period, each model ensures a steady supply of ice, which is essential for businesses with high demand. The ice produced is in the form of clear, hard cubes, ideal for beverage cooling, cocktail preparation, and food presentation.

Both models showcase the unique Hoshizaki ice-making system, which employs a direct cooling method. This technology uses individual stainless steel evaporators to produce ice, resulting in more uniform cubes and less waste. The stainless steel construction contributes to the durability of the units, making them suitable for rugged commercial environments.

Energy efficiency is another hallmark of the KMD-410MWH and KMD-410MAH. These machines are designed with an energy-saving mode that reduces power consumption without compromising ice production. This is critical for businesses looking to minimize operational costs while maintaining high standards of service.

User convenience is prioritized in these models through features like the easy-to-clean design. The internal components can be accessed quickly, allowing for simpler maintenance and sanitation processes. Additionally, the built-in cleaning cycle aids in maintaining ice purity and preventing bacterial growth, which is essential for food safety.

The KMD-410MAH also includes an advanced monitoring system with indicators for water usage and ice levels. This feature allows operators to keep track of performance and make necessary adjustments, ensuring that the ice maker operates at peak efficiency.

For installation flexibility, both models can be paired with various storage bins and dispensers, adapting to the layout of any establishment. Furthermore, they can be equipped with optional filtration systems that enhance water quality, further improving the taste and clarity of the ice produced.

In summary, the Hoshizaki KMD-410MWH and KMD-410MAH ice makers are exemplary choices for any business that demands high-quality, reliable ice production. Their robust features, energy-efficient operation, and user-friendly design make them indispensable assets in the hospitality and foodservice industries.
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