Hoshizaki KM-900MWF, KM-900MRF3, KM-900MAF service manual Checking the Controller Board

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5) Freeze Timer

CAUTION

Adjust to proper specification, or the unit may not operate correctly.

Two new dip switches numbered 9 and 10 have been added to the improved “E” board to better prevent possible freeze ups. These settings come factory set to the default setting of 60 min. (OFF, OFF). Check the adjustment chart published in the Tech Specs for proper settings. If the old board does not have these two dip switches, (only 8 in- stead of 10), leave setting as OFF, OFF.

SETTING

 

TIME

Dip Switch

Dip Switch

 

No. 9

 

No. 10

 

OFF

 

OFF

60 min.

ON

 

OFF

70 min.

OFF

 

ON

50 min.

ON

 

ON

60 min.

6) Bin Control

CAUTION

When the ambient temperature is below 45°F, the Bin Control Thermostat operates to stop the icemaker even if the Ice Storage Bin is empty. When the Thermostat is set in the prohibited range, the icemaker operates continuously even if the Ice Storage Bin is filled with ice. Setting in the prohibited range might cause severe damage to the icemaker resulting in failure.

No adjustment is required under normal use, as the Bin Control is factory-adjusted. Adjust it, if necessary, so that the icemaker stops automatically within 10 seconds after ice contacts the Bin Control Thermostat Bulb.

[e] CHECKING THE CONTROLLER BOARD

1)Visually check the sequence with the icemaker operating.

2)Visually check the Controller Board by using the following procedures.

(i)Adjust the Defrost Timer to minimum position. Disconnect the Thermistor from the Controller Board.

Connect a 1.5 kΩ - 3.5 kΩ resistor to the Connector K3 (pins #1 and #2), and energize the unit.

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Contents KM-900MAF KM-900MWF KM-900MRF Hoshizaki AMERICA, INC Contents Maintenance KM-900MAF SpecificationsKM-900MWF KM-900MRF KM-900MRF3 Condensing Unit URC-12F Specifications Model URC-12F II. General Information Construction KM-900MWF KM-900MRF KM-900MRF3 Controller Board Features of Control Products E Controller BoardSOLID-STATE Control Controller BoardPage Minute Fill Cycle 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 Sequence 1st Cycle2nd Cycle and after with pump drain 2nd Cycle and after with no pump drain OFF KM-900MWF Controls and AdjustmentsSetting Time Setting Frequency Checking the Controller Board Page III. Technical Information KM-900MWF KM-900MRF and KM-900MRF3 Wiring Diagrams KM-900MWF KM-900MRF KM-900MRF3 From Defrost Cycle To Defrost Cycle Timing ChartTo Freeze Cycle From Freeze Cycle Performance Data KM-900MWF KM-900MRF KM-900MRF3 Problem Possible Cause Remedy IV. Service Diagnosis No ICE ProductionController Board Problem Possible Cause Remedy LOW ICE Production Evaporator is Frozen UPOthers Abnormal ICEService for Refrigerant Lines Removal and Replacement of ComponentsRefrigerant Recovery Evacuation and Recharge R-404ABrazing Removal and Replacement of Compressor Important Page Removal and Replacement of Expansion Valve Removal and Replacement of DrierRemoval 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 Pump Motor Removal and Replacement of Water ValveRemoval and Replacement of Spray Tubes Preparing the Icemaker for Long Storage VI. Maintenance and Cleaning InstructionsPage Cleaning Cleaning Procedure Sanitizing Procedure Following Cleaning Procedure Maintenance

KM-900MAF, KM-900MRF3, KM-900MWF, KM-900MRF specifications

The Hoshizaki KM-900MRF3, KM-900MRF, KM-900MAF, and KM-900MWF are high-performance ice machines renowned for their efficiency, durability, and advanced technology. These models are designed to meet the needs of various industries, including restaurants, bars, and hotels, where ice production is critical for ensuring customer satisfaction.

One of the standout features of the KM-900 series is its high ice production capacity. Each model can produce an impressive amount of ice per day, making it suitable for high-demand environments. The KM-900MRF3 and KM-900MRF models are particularly noted for their ability to create crescent ice, which is known for its density and slow melting properties, ideal for beverages. On the other hand, the KM-900MAF and KM-900MWF models are designed to produce flake ice, which is perfect for display purposes and for use in food processing.

The KM-900 series uses a patented ice-making system that maximizes efficiency while minimizing energy consumption. These machines are equipped with powerful compressors and evaporators, ensuring quick and reliable ice production. Hoshizaki's commitment to energy efficiency is reflected in the low energy consumption rates of these machines, which are designed to operate quietly and with minimal environmental impact.

Moreover, each model features a durable stainless steel exterior, making them resistant to corrosion and easy to clean. This durability ensures that the machines maintain their high performance over time, even in demanding environments. The user-friendly control panel allows for easy operation and monitoring, while the built-in diagnostics can alert users to any potential issues, ensuring quick maintenance and minimal downtime.

The KM-900 series also prioritizes hygiene with its easy-to-clean design, including removable components and smooth surfaces that prevent bacterial growth. This is crucial for establishments that need to comply with health and safety regulations.

In summary, the Hoshizaki KM-900MRF3, KM-900MRF, KM-900MAF, and KM-900MWF models set the standard for commercial ice production. With their robust features, energy-efficient technology, and commitment to hygiene, these machines are an excellent investment for any business requiring high volumes of reliable ice. Their advanced design ensures that businesses can operate smoothly while providing customers with quality service.
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