7)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. Diagnosis: Check that CT LEDs and EvapFM icon turn on. Next, check that EvapFM energizes. If not, confirm that DS is engaged. Check across DS for 5VDC. If 5VDC is not present, check DS activation lever and DS continuity. Note: DS contacts are open when DS is engaged. If 5VDC is present, check CB EvapFM connector for 12VDC. If 12VDC is not present, replace CB. If 12VDC is present, check EvapFM wiring connector for loose connection, EvapFM continuity, and fan blade for binding.

8)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. Diagnosis: Confirm CTh is at least 4°F above setpoint. Next, check that Comp energizes. If not, check CB Comp connector for 115VAC. If 115VAC is not present, confirm CTh status. See "IV.C. Thermistor Check." If CTh is in range and 115VAC is not present, replace CB. If 115VAC is present, and Comp is off, check Comp wire harness connections. Next check Comp external protector (integrated with start relay), Comp start components, and Comp motor winding continuity. If Comp energizes and the cabinet does not cool down, check for air leaks around the door (gasket), a restriction in the refrigeration circuit, or refrigerant leak.

9)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. Diagnosis: If CTh is in range and Comp does not de‑energize, confirm Comp run time > 3 min. If Comp continues after 3-min. Comp run timer terminates, replace CB.

10)Cool Down Restart–EvapFM icon is on. CTh warms to 4°F above setpoint (default 39°F). Comp icon turns on and Comp energizes. 3-min. Comp run timer starts. Diagnosis: See step 8 above.

11)Defrost–EvapFM and Defrost icons are on. Cabinet Temperature is Displayed.

a)Automatic Defrost Initiation: 6-hr. DT terminates. 30‑min. DT starts. EvapFM continues. If Comp run time < 3 min., Comp icon and Comp continue until 3-min. Comp run timer terminates. Once 3-min. Comp run timer terminates, Comp icon turns off, Comp de-energizes, and defrost starts. Diagnosis: Has 6-hr. DT terminated? If defrost icon is on, confirm that Comp de‑energizes. If not, confirm Comp run time > 3 min. If Comp continues after 3-min. Comp run timer terminates, replace CB.

b)Manual Defrost Initiation: To initiate a manual defrost, press and hold the "+" button until the defrost icon turns. 30‑min. DT starts. EvapFM continues. If Comp run time < 3 min., Comp icon and Comp continue until 3-min. Comp run timer terminates.

Once 3-min. Comp run timer terminates, Comp icon turns off, Comp de‑energizes, and defrost starts. Diagnosis: If defrost icon is on, confirm that Comp de‑energizes. If not, confirm Comp run time > 3 min. If Comp continues after 3-min. Comp run timer terminates, replace CB.

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Hoshizaki HR24A service manual
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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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