Hoshizaki KM-501MRH, KM-501MWH, KM-501MAH service manual Contents

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Please review this manual. It should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualified service technicians should service and maintain the icemaker. This manual should be made available to the technician prior to service or maintenance.

CONTENTS

 

I. Specifications

5

A. Icemaker

5

1. KM-501MAH (air-cooled)

5

2. KM-501MWH (water-cooled)

6

3. KM-501MRH (remote air-cooled)

7

B. Condensing Unit

8

1. URC-6F

8

II. General Information

10

A. Construction

10

1. KM-501MAH (air-cooled)

10

2. KM-501MWH (water-cooled)

11

3. KM-501MRH (remote air-cooled)

12

B. Sequence of Operation

13

1. One Minute Fill Cycle

13

2. Initial Harvest Cycle

13

3. Freeze Cycle

13

4. Pump-Out Cycle

13

5. Normal Harvest Cycle

13

C. Control Board

15

1. Control Board Layout

16

2. Features

17

a) Maximum Water Supply Period – 6 minutes

17

b) Harvest Backup Timer and Freeze Timer

17

c) High Temperature Safety

17

d) Low Water Safety

17

e) High Voltage and Low Voltage Cut-outs

17

f) LED Lights and Audible Alarm Safeties

18

3. Controls and Adjustments

19

a) Default Dip Switch Settings

19

b) Harvest Control – Thermistor

19

c) Harvest Timer (dip switch 1 & 2)

20

d) Pump-Out Timer (dip switch 3 & 4)

20

e) Pump-Out Frequency Control (dip switch 5 & 6)

21

f) Freeze Timer (dip switch 9 & 10)

21

g) Bin Control

21

4. Control Board Check Procedure

22

5. Control Board Replacement

22

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Contents KM-501MAH KM-501MWH KM-501MRH Hoshizaki AMERICA, INC Contents Page KM-501MAH air-cooled Specifications IcemakerWater Cooled Condenser KM-501MWH water-cooledKM-501MRH remote air-cooled URC-6F Condensing UnitSpecifications II. General Information Construction KM-501MWH water-cooled KM-501MRH remote air-cooled Sequence of Operation Cycle Steps Harvest Cycle Freeze Cycle One Minute Control Board Control Products E Control Board Control Board LayoutControl Board Maximum Water Supply Period 6 minutes FeaturesLED Lights and Audible Alarm Safeties Default Dip Switch Settings Controls and AdjustmentsHarvest Timer dip switch 1 Pump-Out Frequency Control dip switch 5 Control Board Replacement Control Board Check ProcedureKM-501MAH air-cooled KM-501MWH water-cooled KM-501MRH remote air-cooled KM-501MAH air-cooled and KM-501MWH water-cooled Wiring DiagramsPsig Timing Chart Page 245 Performance Data488 482 IV. Service Diagnosis Minute KM Diagnostic Procedure No Ice Production Diagnostic ChartsProblem Possible Cause Remedy Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Low Ice Production Abnormal IceOther Problem Possible Cause Remedy Evacuation and Recharge R-404A Removal and Replacement of ComponentsService for Refrigerant Lines Refrigerant RecoveryBrazing Removal and Replacement of CompressorRemoval and Replacement of Drier Removal and Replacement of Hot Gas Valve and Line Valve Removal and Replacement of Expansion ValveRemoval and Replacement of Evaporator Adjustment of Water Regulating Valve Water-Cooled Model Only Adjustment Screw CW Higher CCW Lower Top View Removal and Replacement of Thermistor Removal and Replacement of Fan Motor Removal and Replacement of Inlet Water ValveRemoval and Replacement of Pump Motor Removal and Replacement of Spray Tubes Cleaning and Sanitizing Procedures VI. Cleaning and Maintenance InstructionsCleaning Procedure Maintenance Sanitizing Procedure Following Cleaning ProcedureStainless Steel Exterior Condenser air-cooled and remote air-cooled models only Preparing the Icemaker for Long StorageStorage Bin and Scoop Air Filters air-cooled models only
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KM-501MAH, KM-501MWH, KM-501MRH specifications

The Hoshizaki KM-501MWH, KM-501MAH, and KM-501MRH are standout models in the commercial ice machine market, known for their robust performance and innovative technologies. These machines are specially designed to meet the diverse needs of restaurants, bars, and other food service establishments that require a reliable source of high-quality ice.

One of the defining features of the KM-501 series is their high production capacity. Each model can produce up to 500 pounds of ice per day, ensuring that even the busiest establishments can keep up with demand. The ice produced is crystal-clear, with a unique crescent shape that not only looks appealing but also melts slowly, making it ideal for drinks and food presentations.

The KM-501MWH model is equipped with advanced technology that ensures energy efficiency and reduced water usage. It features a powerful compressor and a highly efficient evaporator, which work together to minimize energy consumption while maximizing output. This makes it an environmentally friendly choice, reducing operational costs for businesses.

The KM-501MAH model stands out with its air-cooled condenser system, which allows for optimal performance without the need for extensive cooling water lines. This makes the installation process easier and reduces complexity, enabling businesses to set up their ice machine with minimal hassle. Furthermore, it features a self-cleaning mode that simplifies maintenance, contributing to consistent ice quality over time.

On the other hand, the KM-501MRH is designed for rugged environments. It is constructed with high-quality materials that enhance durability and longevity, making it suitable for outdoor applications or establishments located in warmer climates. The stainless-steel design not only contributes to the machine's robustness but also ensures easy cleaning and resistance to rust and corrosion.

Another key characteristic of the Hoshizaki KM-501 models is their user-friendly control panel. These machines come with intuitive controls that allow operators to easily adjust settings and monitor performance. This feature is particularly useful for staff in busy kitchens, enabling them to focus on service without constant checks on ice production.

Overall, the Hoshizaki KM-501MWH, KM-501MAH, and KM-501MRH offer excellent performance, energy efficiency, and user-friendliness. Their combination of innovative technologies, durable design, and high output capacity make them exceptional choices for any establishment in need of reliable ice production. Whether for a bustling restaurant or a bar serving up cocktails, these machines deliver ice that consistently meets high standards.
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