Articles by Joe Marchese

Ice Breaker: Advantages of Parallel Compressor Racks

Supermarkets Use Design to Cool Cases
By Joe Marchese
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For maximum efficiency, a bank of compressors should be connected to evaporators operating at similar temperatures. From an operational standpoint, cases of different evaporating temperatures can be connected to the rack; however, this causes a substantial energy loss.


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Ice Breaker: What Is a Ton of Refrigeration?

Dealing With Btu and System Capacity
By Joe Marchese
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A ton of refrigeration can be defined as the amount of heat removal to produce one ton of ice at 32° from one ton of water at 32°. But what else does it mean?


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Ice Breaker: Suction Line Pressure and System Capacity

Ways to Avoid Reduced Operating Capacity
By Joe Marchese
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An excessive pressure drop across the suction line will reduce the operating capacity of a refrigeration system.


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Ice Breaker: Gauging the Importance of the Service Ticket

Written Documentation an Important Part of Call
By Joe Marchese
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Techs may not see the importance of the service ticket, but they should, since it can be an accurate reflection of him and his work. 


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Ice Breaker: Brazing and Soldering Procedures Need Care

Tips for Working Safely with Torches
By Joe Marchese
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Refrigeration technicians need to use extreme care when working with torches during the brazing and soldering process. The flames of a torch can easily reach 3,000°F. At this temperature, serious damage can be the result of misuse and carelessness.


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Ice Breaker: High-Pressure Switches

Troubleshooting Compressor Shutdown Controls Requires Care
By Joe Marchese
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High-pressure switches are designed to shut down a compressor if the system’s high pressure rises above an unsafe level, not allowing the compressor to restart until the pressure returns to a safe level. 


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Ice Breaker: How to Size Replacement Cap Tubes

Replacing Because of Restrictions
By Joe Marchese
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One field problem frequently encountered with this type of metering device is that it can become plugged with system debris, causing a restriction. When this happens, the cap tube will typically need to be replaced.


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Ice Breaker: Evap. Pressure Regulators

A Look at Familiar Refrigerant Flow Control Device
By Joe Marchese
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Joe Marchese explains the refrigerant flow control device, which prevents the refrigerant pressure in an evaporator from operating below a minimum value, and discusses how to select the right one for the job. 


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Ice Breaker: What a Tripped Oil Pressure Control Means

Avoiding Compressor Shut Down
By Joe Marchese
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Any time an oil pressure control shuts down a compressor, the cause of the shutdown must be identified. The tripped control is a warning of another existing problem. Simply resetting the control will not solve the problem.


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Ice Breaker: Diagnosing Failures in Refrigeration

Determining Why a Refrigeration System Is Not Operating Properly
By Joe Marchese
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Sometimes we over think both the easy and hard problems, making a true system issue more difficult than it really needs to be. 


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