Hoshizaki KM-501MAH, KM-501MRH, KM-501MWH service manual Evaporator is Frozen Up

Page 38

2. Evaporator is Frozen Up

Problem

Possible Cause

 

Remedy

 

 

 

 

[1]Freeze cycle time is

a)Float Switch

1. Leads short-circuit or

1. Check and replace.

too long.

 

defective switch.

 

 

 

 

 

 

 

2. Float does not move

2. Clean or replace.

 

 

freely.

 

 

 

 

 

 

b)Inlet Water Valve

1. Diaphragm does not

1. Check for water leaks with

 

 

close.

icemaker off.

 

 

 

 

 

c) Control Board

1. Defective.

1. See "II.C.4. Control Board

 

 

 

Check Procedure."

 

 

 

 

[2]All ice formed on

a)Evaporator

1. Scaled up.

1. Clean.

evaporator does not

 

 

 

b)Water Supply Line

1. Water pressure too

1. Check and get

fall into bin in harvest

cycle.

 

low.

recommended pressure.

c) Water Filter System

1. Dirty/Restricted

1. Replace filter.

 

 

 

 

 

 

d)Inlet Water Valve

1. Dirty mesh filter or

1. Clean.

 

 

orifice.

 

 

 

 

 

 

 

2. Diaphragm does not

2. Check for water leaks with

 

 

close.

icemaker off.

 

 

 

 

 

e) Ambient and/or water

1. Too cool.

1. Increase temperature.

 

temperature.

 

 

 

 

 

 

 

f) Line Valve

1. Continues to open in

1. Check operation in harvest

 

 

harvest cycle.

cycle and replace.

 

 

 

 

 

g)Thermistor

1. Out of position or

1. See "V.I. Removal

 

 

loose attachment.

and Replacement of

 

 

 

Thermistor."

 

 

 

 

 

h)Control Board

1. Harvest timer is set

1. Adjust longer, referring

 

 

too short.

to "II.C.3. Controls and

 

 

 

Adjustments, c) Harvest

 

 

 

Timer.

 

 

 

 

 

 

2. Defective.

2. See "II.C.4. Control Board

 

 

 

Check Procedure."

 

 

 

 

[3]Other

a)Spray Tubes

1. Clogged.

1. Clean

 

 

 

 

 

 

2. Out of position.

2. Place in position.

 

 

 

 

 

b)Water System

1. Dirty.

1. Clean.

 

 

 

 

 

c) Refrigerant

1. Undercharged.

1. Check for leaks and

 

 

 

recharge.

 

 

 

 

 

d)Expansion Valve

1. Bulb out of position or

1. Place in position.

 

 

loose attachment.

 

 

 

 

 

 

 

2. Defective.

2. Replace.

 

 

 

 

 

e)Hot Gas Valve

1. Coil winding opened.

1. Replace.

 

 

 

 

 

 

2. Plunger does not

2. Replace.

 

 

move.

 

 

 

 

 

 

 

3. Wiring to hot gas

3. Check for loose

 

 

valve.

connection or open, and

 

 

 

replace.

 

 

 

 

 

f) Ice Cube Guide

1. Out of position and ice

1. Place in position.

 

 

trapped.

 

 

 

 

 

38

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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 Control Products E Control BoardControl Board Layout 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 Other Low Ice ProductionAbnormal Ice 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 Pump Motor Removal and Replacement of Fan MotorRemoval and Replacement of Inlet Water Valve Removal and Replacement of Spray Tubes VI. Cleaning and Maintenance Instructions Cleaning and Sanitizing ProceduresCleaning Procedure Stainless Steel Exterior MaintenanceSanitizing Procedure Following Cleaning Procedure 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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