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Sushi Display Case Study

CTC Refrigeration has more than 25 years of experience maintaining and repairing commercial and industrial refrigeration systems and units. Below is a story illustrating our approach to a customers’ dilemmas, and how we address unique refrigeration needs.

Many years ago, we received a call from a local pharmaceutical company to quote the installation of a Sushi display case in their employee cafeteria. Sushi contains raw fish amongst other food stuffs and the final product must be maintained at 30°F or lower.

There was a single deck display case currently installed where the new Sushi case was to go. It was designed to operate at 35°F with multiple defrosts throughout the day. This configuration wouldn’t work for displaying sushi.

Unfortunately, there weren’t any manufacturers that had a case to fit this existing footprint either. We offered to engineer the existing case refrigeration system to maintain the required Sushi product display temperature. The freeze point of fish is typically 28°F. The air screen temperature would need to be about 25-26°F.

We replaced the 3 fan assemblies (16 watt motors w/ 5 blade fans) with larger EBM Pabst Fans featuring 3500 RPM motors and 8 blade fans. This increased the air flow and helped maintain the air screen. Next, we replaced the remote compressor with a larger, low temperature compressor and corresponding TXV using R-507 refrigerant. The water-cooled condenser was acid-cleaned and deemed to have adequate capacity for this system.

There was an HVAC supply air grille located above the case. We redirected this airstream so it would not interfere with the case air screen. A Honeywell electronic thermostat was installed to control the temperature and off-cycle defrost. The sensor was a NEMA4X installed in the return air of the case.

The basic operation of the modified case was to start-up the refrigeration at 5:00 am each morning of use. This would ensure the case was ready to load with product by 7:00 am. The local thermostat was locked in to maintain 70°F during these hours.

The case continued to operate in refrigeration mode until 3 PM each day. It would then cycle off and the related ice would melt off the evaporator coil. The fans operated continuously. The chefs knew the timeline of operation and made sure the case was unloaded each day by 3 PM.

This modified case has been inspected by the local health department for many years without 1 write-up. It continues to provide a useful point of sale display for the cafeteria.

Good engineering and a thorough project work scope by CTC provided many additional years of use and profitability for this refrigerated display case. Our ability to look at the scope of the project and generate alternative solutions saved our client the trouble of finding and fitting a new unit into their space.

Do you have unique refrigeration requirements? CTC can help! Contact us

Commercial Refrigeration and HVAC Services

CTC offers custom refrigeration and HVAC solutions and maintenance for pharmaceutical, agricultural, and retail food applications. We have more than 25 years of experience designing and maintaining complex systems to meet commercial and industrial needs.


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Did you know?
Around 500 B.C. the Egyptians and Indians made ice on cold nights by setting water out in earthenware pots and keeping the pots wet.
Did you know?
The process of liquefying gas is the basis of modern refrigeration technology. This process was patented by Carl von Linden, German engineer, in 1876.
Did you know?
Regular maintenance on refrigeration units can increase your system’s efficiency and prevent damages that lead to loss of materials and violation of temperature compliance.
Did you know?
In 1889 and 1890, warm winters created severe shortages of natural ice in the U.S. This increased the usage of mechanical refrigeration for freezing and storage in the fish, brewing, dairy, and meat industries. Commercial refrigeration techniques were also applied to railroad cars and grocery store coolers.
Did you know?
One of the earliest practical refrigeration machines was built by physician John Gorrie in 1834. He used it to make ice to cool the air for patients with yellow fever.

Whether you need one time maintenence, or want to sign up for our planned service agreements, CTC is here for all of your commercial and industrial refrigeration needs.

Contact us today for a free estimate on your current needs, or to establish a continuing working relationship.

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