[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.

After the 1 minute ± 5 second water supply cycle and the 2 minute ± 10 second defrost cycle, the unit should start the freeze cycle.

(ii)After the above step (i), disconnect the float switch leads from the controller board within the first 5 minutes of the freeze cycle.

The unit should go into the defrost cycle after the first 5 minutes ± 20 seconds of the freeze cycle.

(iii)Reconnect the float switch connector to the controller board. After the first 5 minutes of the freeze cycle, disconnect the float switch leads from the controller board.

At this point, the unit should start the defrost cycle.

(iv)After step (iii), de-energize the unit and confirm that the defrost timer is in the minimum position. Disconnect the resistor from the controller board, and energize the unit.

After the 1 minute water supply cycle, the defrost cycle starts.

Reconnect a 1.5 kΩ - 3.5 kΩ resistor to the connector K3 (pins #1 and #2) after the first 2 minutes of the defrost cycle.

The unit should start the freeze cycle after 1 minute ± 5 seconds from the resistor connection.

3) Check the controller board by using test program of the controller board.

The output test switch “S3” provides a relay sequence test. With power OFF, place S3 on and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, and 4, normal sequence every 5 seconds. S3 should remain in the “OFF” position for normal operation.

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Hoshizaki KMD-900MAH, KMD-700MAH, KMD-700MWH, KMD-700MRH, KMD-900MWH, KMD-900MRH service manual Checking the Controller Board
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KMD-900MRH, KMD-900MWH, KMD-700MRH, KMD-700MWH, KMD-700MAH specifications

The Hoshizaki KMD series offers a range of high-performance ice machines designed to meet the needs of various commercial applications, including restaurants, bars, and healthcare facilities. Models such as the KMD-700MAH, KMD-700MRH, KMD-900MRH, KMD-900MWH, and KMD-900MAH are equipped with innovative technologies and features that ensure efficient ice production and reliable operation.

The KMD-700MAH model is known for its adaptability and efficiency, producing flake ice that is ideal for use in various applications like food preservation, cooling drinks, and more. With a production capacity of up to 700 pounds of ice per day, this model is perfect for medium-sized establishments. Its advanced design incorporates a unique evaporator that enhances ice production while minimizing energy consumption.

Similarly, the KMD-700MRH offers versatility with a similar production capacity, focusing on reliability and performance. This model uses a high-efficiency compressor and a self-contained refrigeration system, ensuring consistent ice production across different ambient conditions. The KMD-700MRH is especially suitable for locations that require frequent and reliable ice replenishment.

The KMD-900 series takes performance a step further, with the KMD-900MRH and KMD-900MAH providing a higher production capacity of up to 900 pounds per day. These machines leverage Hoshizaki’s patented air-cooled technology, which enhances efficiency and reduces operating costs. The robust construction and advanced features make them ideal for high-demand environments.

The KMD-900MWH variant offers an innovative water-cooled option, suitable for businesses in areas with high ambient temperatures or those where air-cooled machines might struggle. By utilizing a water cooling system, it ensures stable performance even in challenging conditions, making it a dependable choice for busy kitchens.

All models in the KMD series feature an easy-to-use digital control panel, which allows for effortless monitoring and adjustments to operations. This technology not only simplifies management but also enables users to receive real-time alerts regarding machine status and maintenance needs, ultimately minimizing downtime.

In summary, the Hoshizaki KMD-700MAH, KMD-700MRH, KMD-900MRH, KMD-900MWH, and KMD-900MAH models are equipped with advanced ice-making technologies designed to deliver high production rates, efficient energy consumption, and reliable performance. Whether it's for a restaurant, bar, or healthcare application, these machines bring together reliability and versatility, making them indispensable tools for any commercial kitchen environment.
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