Hoshizaki HR24A service manual Sequence of Operation, Sequence Cycles and Shutdown

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B. Sequence of Operation

1. Sequence Cycles and Shutdown

The steps in the sequence are as outlined below. When power is supplied to CB, DM LEDs flash 3 times, then °F LED turns on. Press the power button for 2 sec., the cabinet temperature and EvapFM icon turn on and EvapFM starts. 2-min. Comp delay timer starts. Comp icon flashes during the 2-min. Comp delay. When the 2-min. Comp delay timer terminates, Comp icon turns steady and Comp starts.

Note: • EvapFM de-energizes when door is opened.

•There is a Comp delay of 2 min. at startup.

•There is a minimum Comp run time of 3 min.

•There is a Comp delay of 2 min. after a power interruption.

Cabinet Temperature LEDs "-" Down

"+" Up

"P" Set

Power

Button

Button

Button

Button

°F

Alarm Icon

Compressor Icon

 

°F LED

Defrost Icon

Evaporator Fan Motor Icon

 

a)Refrigerator

•The °F and CT LEDs remain on throughout the sequence of operation.

•This appliance uses a time-initiated/time-terminated Comp off cycle defrost. The factory default defrost setting is once every 6 hours for 30 min.

•6-hr. defrost timer starts the very first time CB is energized (factory testing). Defrost time is cumulative power on time, therefore time may vary between starting the appliance and the first defrost. After the first defrost, defrost can be monitored for activation every 6 hours.

•Cabinet temperature is displayed during defrost.

1. Startup

EvapFM icon is on and Comp icon is flashing. EvapFM energizes. 2-min. Comp delay timer starts. Comp icon flashes until 2-min. Comp delay timer terminates.

2. Cool Down

EvapFM icon is on and Comp icon turns steady. EvapFM continues. 2-min. Comp delay timer terminates. Comp energizes and 3-min. Comp run timer starts.

3. Cool Down Achieved

EvapFM icon is on. CTh cools to setpoint (default 39°F). EvapFM continues. If Comp run time > 3-min., Comp icon turns off and Comp de-energizes. If Comp run time < 3-min., Comp continues until 3-min. Comp run timer terminates, then Comp icon turns off and Comp de‑energizes.

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Contents HR24A Hoshizaki AMERICA, INC Contents Page Important Safety Information Page Storage Capacity and Dimensions Specifications Electrical and Refrigerant DataStorage Capacity Dimensions Unit mmII. General Information Construction HR24ASequence of Operation Sequence Cycles and ShutdownCool Down Restart EvapFM and Defrost icons are onHR24A Sequence Flow Chart Sequence Flow ChartControl Board and Display Module Control Board Layout Display Module LayoutCabinet Temperature Default SettingsDisplay Module Icons Control Panel LockoutAlarm Safeties High and Low Temperature Alarm Values AH or ALService Menu Service Menu AccessService 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 IV. Service Diagnosis Diagnostic ProcedurePage Energy Saving Mode Startup and Cool Down Control Board CheckDefrost Thermistor Check Diagnostic Chart Appliance Not CoolingEvaporator is Frozen Up Defrost Fails to Start or TerminateService for Refrigerant Lines Replacement of ComponentsRefrigerant Recovery Brazing Evacuation and Recharge R-134aImportant Notes for Component Replacement Door Reversal Cleaning MaintenanceVII. 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.
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