Hoshizaki KM-501MRH, KM-501MWH, KM-501MAH service manual LED Lights and Audible Alarm Safeties

Page 18

f) LED Lights and Audible Alarm Safeties

The red LED indicates proper control voltage and will remain on unless a control voltage problem occurs. At startup a 5 second delay occurs while the board conducts an internal timer check. A short beep occurs when the power switch is turned OFF.

The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the board is 1, 4, 3, 2. For more information, see "II.B. Sequence of Operation."

Sequence Step

LED

Energized

 

Time LEDs are On

Components

Min.

Max.

Avg.

 

 

 

 

 

1 Minute Fill Cycle

4

WV

 

 

60 seconds

Harvest Cycle

1, 4, and 2

WV, HGV,

2 minutes

20 minutes

3 to 5 minutes

 

 

Comp, FMR

 

 

 

Freeze Cycle

1

Comp, PM,

5 minutes

freeze timer

30 to 35 minutes

 

 

FMR/FMS,

 

setting

 

 

 

LLV

 

 

 

Reverse Pump Out

1, 3, and 2

Comp, HGV,

10 seconds

20 seconds

factory setting

 

 

PM, FMR

 

 

 

 

 

 

 

 

 

The built in safeties shut down the unit and have alarms as follows:

No. of Beeps

Type of Alarm

Notes

(every 3 sec.)

 

 

 

 

 

1

High Evaporator Temp.

Check for harvest problem (stuck HGV or

 

(temperature > 127°F)

relay), hot water entering unit, stuck HM,

 

(53°C)

or shorted thermistor.

 

 

 

2

Harvest Backup Timer

Orange LED marked H TIMER lights up.

 

(harvest > 20 min. for two

Check for open thermistor, HGV not

 

cycles in a row)

opening, TXV leaking by, low charge, or

 

 

inefficient compressor.

 

 

 

3

Freeze Timer

Yellow LED marked F TIMER lights up.

 

(freeze > specified setting

Check for F/S stuck closed (up), WV

 

for two cycles in a row)

leaking by, HGV leaking by, TXV not

 

Timer is factory set using

feeding properly, low charge, HM not

 

dip switches 9 & 10

bypassing, or inefficient compressor.

 

 

 

To manually reset the above safeties, press the alarm reset button with the power supply on.

6

Low Voltage

Red LED will turn off if voltage protection

 

(92Vac ±5% or less)

operates.

 

 

The control voltage safeties automatically

7

High Voltage

reset when voltage is corrected.

 

(147Vac ±5% or more)

 

 

 

 

 

Legend: Comp–compressor; FMR–remote fan motor; FMS–self-contained fan motor; F/S–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.); LLV–Liquid Line Valve; PM–pump motor; TXV–thermostatic expansion valve; WV–inlet water valve

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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 Products E Control Board Control Board LayoutControl 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 Low Ice Production Abnormal IceOther 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 Fan Motor Removal and Replacement of Inlet Water ValveRemoval and Replacement of Pump Motor Removal and Replacement of Spray Tubes VI. Cleaning and Maintenance Instructions Cleaning and Sanitizing ProceduresCleaning Procedure Maintenance Sanitizing Procedure Following Cleaning ProcedureStainless 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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