Hoshizaki KM-501MWH, KM-501MRH, KM-501MAH service manual Diagnostic Charts, No Ice Production

Page 34

freeze with the float switch removed, replace the board.

Note: Normal freeze cycle will last 20 to 40 minutes depending on model and conditions. Cycle times and pressures should follow performance data provided in this manual.

6)Pump-Out Cycle (10/20 second pump out) – the compressor remains energized, the hot gas valve energizes, the fan motor de-energizes, the pump motor stops for

2 seconds and starts in reverse rotation for 10/20 seconds. (This removes contaminants from the water reservoir through the check valve (drain valve) and down the drain and allows for a power flush of the float switch.) Check for clear tubing at the check valve housing and check the unit drain for water flow. Diagnosis: If the pump motor does not reverse, check the circuit and capacitor. If water does not pump out, remove the check valve (drain valve) housing and check/clean the valve assembly.

7)Normal Harvest Cycle – same as the initial harvest cycle – Return to step 4.

Note: Unit continues to cycle until bin control is satisfied or power is switched OFF. (The pump out cycle can be adjusted to occur every cycle, or every 2, 5, or 10 cycles. The factory default is every 10 cycles.) The unit always restarts at the 1 minute fill cycle.

B. Diagnostic Charts

1. No Ice Production

Problem

Possible Cause

 

Remedy

 

 

 

 

[1] The icemaker will not

a)Power Supply

1. OFF position.

1. Move to ON position.

start.

 

 

 

 

2. Loose connection.

2. Tighten.

 

 

 

 

 

 

 

 

3. Bad contacts.

3. Check for continuity and

 

 

 

replace.

 

 

 

 

 

 

4. Voltage too high or too

4. Check and get

 

 

low.

recommended voltage.

 

 

 

 

 

b)Fuse (Inside fused

1. Blown.

1. Check for short circuit and

 

disconnect, if any)

 

replace.

 

 

 

 

 

c) Control Switch

1. OFF position.

1. Move to ICE position.

 

 

 

 

 

 

2. Bad contacts.

2. Check for continuity and

 

 

 

replace.

 

 

 

 

 

d)Bin Control Thermostat

1. Tripped with bin filled

1. Remove ice.

 

 

with ice.

 

 

 

 

 

 

 

2. Ambient temperature

2. Increase ambient

 

 

too cool.

temperature.

 

 

 

 

 

 

3. Set too warm.

3. See "II.C.3. Controls

 

 

 

and Adjustments, g) Bin

 

 

 

Control."

 

 

 

 

 

 

4. Bulb out of position.

4. Place in position.

 

 

 

 

 

 

5. Bad contacts.

5. Check for continuity and

 

 

 

replace.

 

 

 

 

 

e)High Pressure Control

1. Bad contacts.

1. Check for continuity and

 

 

 

replace.

 

 

 

 

 

 

2. Dirty air filter or

2. Clean.

 

 

condenser.

 

 

 

 

 

34

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Contents KM-501MAH KM-501MWH KM-501MRH Hoshizaki AMERICA, INC Contents Page Specifications Icemaker KM-501MAH air-cooledKM-501MWH water-cooled Water Cooled CondenserKM-501MRH remote air-cooled Condensing Unit URC-6FSpecifications 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 Board Layout Control Products E Control BoardControl Board Features Maximum Water Supply Period 6 minutesLED Lights and Audible Alarm Safeties Controls and Adjustments Default Dip Switch SettingsHarvest Timer dip switch 1 Pump-Out Frequency Control dip switch 5 Control Board Check Procedure Control Board ReplacementKM-501MAH air-cooled KM-501MWH water-cooled KM-501MRH remote air-cooled Wiring Diagrams KM-501MAH air-cooled and KM-501MWH water-cooledPsig Timing Chart Page Performance Data 245488 482 IV. Service Diagnosis Minute KM Diagnostic Procedure Diagnostic Charts No Ice ProductionProblem Possible Cause Remedy Problem Possible Cause Remedy Problem Possible Cause Remedy Evaporator is Frozen Up Abnormal Ice Low Ice ProductionOther Problem Possible Cause Remedy Refrigerant Recovery Removal and Replacement of ComponentsService for Refrigerant Lines Evacuation and Recharge R-404ARemoval and Replacement of Compressor BrazingRemoval and Replacement of Drier Removal and Replacement of Expansion Valve Removal and Replacement of Hot Gas Valve and Line 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 Inlet Water Valve Removal and Replacement of Fan MotorRemoval and Replacement of Pump Motor Removal and Replacement of Spray Tubes VI. Cleaning and Maintenance Instructions Cleaning and Sanitizing ProceduresCleaning Procedure Sanitizing Procedure Following Cleaning Procedure MaintenanceStainless Steel Exterior Air Filters air-cooled models only Preparing the Icemaker for Long StorageStorage Bin and Scoop Condenser air-cooled and remote 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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