Hoshizaki HR24A service manual Alarm Safeties, High and Low Temperature Alarm Values AH or AL

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G. Alarm Safeties

The alarms are designed to protect the appliance and the items inside. These alarms give information and warnings in the event the appliance is operating out of acceptable parameters. For all alarms except Pr1, the alarm icon turns on and the alarm code alternates with the cabinet temperature. If the Pr1 alarm occurs, only Pr1 and the alarm icon are displayed.

Alarm Signals

Alarm Code

Problem

Corrective Action/Reset Details

 

 

 

 

High Temperature Alarm

If obvious corrections such as closing the door and

 

 

cleaning the condenser do not bring temperature

AH

Cabinet temperature has exceeded the

back in range, see "IV. Service Diagnosis."

setpoint temperature by 10°F for more

 

 

 

 

than 2 hours.

Automatically resets when temperature returns to

 

 

normal. Alarm icon flashes until reset manually.

 

 

 

 

Low Temperature Alarm

If obvious corrections do not bring the temperature

 

 

back in range, see "IV. Service Diagnosis."

AL

Cabinet temperature has remained below

 

 

the setpoint temperature by 10°F for more

Automatically resets when temperature returns to

 

than 2 hours.

normal. Alarm icon flashes until reset manually.

 

 

 

Ld

Door Open

Close the door.

 

 

 

 

Cabinet Thermistor Malfunction Alarm

Compressor and evaporator fan motor cycle 10 min.

Pr1

 

on, 10 min. off.

 

Cabinet thermistor has failed.

 

a) High and Low Temperature Alarm Values (AH or AL)

If an AH or AL alarm occurs, follow the steps below to acquire alarm details.

1)Press the "-" button for 3 sec. to enter the alarm menu. "EnS" is displayed.

2)Press the "+" button once. "LS" is displayed.

3)Press the "P" button. The alarm code is displayed.

4)Press the "P" button again and the alarm details are displayed in 2 second increments.

AH or AL Alarm code

XX°F The highest or lowest temperature during the alarm

dur Alarm duration

h01 Hours alarm has been engaged

n15 Minutes alarm has been engaged (continuance of h01)

To review, press the "P" button again.

To exit, press the on/off button twice. After pressing the on/off button the first time, "LS" is displayed. After pressing the on/off button the second time, the display returns to the alarm code display.

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Contents HR24A Hoshizaki AMERICA, INC Contents Page Important Safety Information Page Storage Capacity Specifications Electrical and Refrigerant DataStorage Capacity and Dimensions Unit mm DimensionsHR24A II. General Information ConstructionSequence Cycles and Shutdown Sequence of OperationEvapFM and Defrost icons are on Cool Down RestartSequence Flow Chart HR24A Sequence Flow ChartControl Board and Display Module Display Module Layout Control Board LayoutDefault Settings Cabinet TemperatureControl Panel Lockout Display Module IconsHigh and Low Temperature Alarm Values AH or AL Alarm SafetiesService Menu Access Service MenuService Menu Chart Page AL alarm sensor. Do not adjust Fan operation with door closed 247 Address not used Baud Rate not used Parity not used III. Technical Data Refrigeration Circuit Wiring Diagram Diagnostic Procedure IV. Service DiagnosisPage Energy Saving Mode Defrost Control Board CheckStartup and Cool Down Thermistor Check Appliance Not Cooling Diagnostic ChartDefrost Fails to Start or Terminate Evaporator is Frozen UpRefrigerant Recovery Replacement of ComponentsService for Refrigerant Lines Evacuation and Recharge R-134a BrazingImportant Notes for Component Replacement Door Reversal Maintenance CleaningVII. Preparing the Appliance for Periods of Non-Use VIII. Disposal
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HR24A specifications

The Hoshizaki HR24A is an advanced refrigeration unit designed to meet the cooling needs of commercial kitchens and food storage facilities. Known for its reliability and efficiency, this model showcases several innovative features that set it apart in the competitive market of commercial refrigeration.

One of the standout characteristics of the Hoshizaki HR24A is its robust construction. Built with a durable stainless steel exterior, it not only adds aesthetic appeal but also ensures longevity and resistance to corrosion and wear. The interior is designed for easy cleaning, with rounded corners that minimize the buildup of grime and food particles.

The HR24A offers an impressive storage capacity, making it ideal for establishments with high-volume food storage requirements. With a temperature range typically between 33°F and 38°F, the unit maintains optimal conditions for preserving perishables such as meats, dairy, and vegetables. This precision in temperature control is essential for maintaining food safety and quality.

One of the key technologies integrated into the Hoshizaki HR24A is its advanced refrigeration system. Utilizing a highly efficient compressor and a fan-assisted cooling feature, the unit ensures rapid temperature recovery even in busy kitchen environments. This is crucial during peak hours when door openings are frequent, as it helps maintain consistent internal temperatures.

Energy efficiency is another hallmark of the HR24A. It is designed with environmentally friendly refrigerants and complies with Energy Star standards, which can lead to significant cost savings over time through reduced electricity consumption. This commitment to environmental responsibility makes it an attractive option for eco-conscious businesses.

In terms of user-friendliness, the HR24A is equipped with digital controls and adjustable shelving, allowing for customized organization according to specific storage needs. The LED lighting inside the unit provides excellent visibility, making it easy to locate items quickly, which is particularly beneficial during busy service periods.

Overall, the Hoshizaki HR24A combines durability, efficiency, and functionality, making it an exceptional choice for anyone seeking a reliable refrigeration solution in a commercial kitchen setting. Whether used in restaurants, hotels, or catering businesses, its impressive features and state-of-the-art technology continue to meet the demanding requirements of the foodservice industry.