Articles by Joe Marchese

Ice Breaker: Choosing the Right Multimeter

By Joe Marchese
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When it comes to choosing a multimeter for servicing refrigeration systems, there are a lot of choices on the market. Careful planning should go into selecting the right meter.


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Ice Breaker: Taking an Oil Sample Without an Oil Plug

By Joe Marchese
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Checking the acidity and/or moisture content of refrigerant oil is one of the methods used to test if a refrigeration system is clean and uncontaminated. But how can you take an oil sample without an oil plug?


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Ice Breaker: Troubleshooting Controller Inputs

By Joe Marchese
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Today more and more systems are incorporating microprocessor controllers into their design. Troubleshooting the operation of these controllers can be a little tricky at times, but if broken down into sections it can be easier to handle.


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Ice Breaker: The True Refrigeration Professional

By Joe Marchese
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I have always been impressed with the true refrigeration professional; the type of guy that not only is able to fix a problem, but also understands the why behind the problem. These guys are not satisfied with just knowing how to replace a failed component . They want to know why it failed.


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Ice Breaker: Troubleshooting Current Relays

By Joe Marchese
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One type of starting relay used on fractional-horsepower compressors is the current relay. A defective current relay can cause a compressor not to start. One popular method of troubleshooting this type of starting relay is with an ohmmeter.


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Ice Breaker: Maintenance as an Energy-Saving Tool

By Joe Marchese
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An effective means of building any refrigeration contracting business is to sell maintenance agreements. Maintenance agreements help to build a strong customer base and even out the workload throughout the year. Is there something else they do for a contractor?


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Ice Breaker: Creating an Electronic Library

By Joe Marchese
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Manufacturers are increasingly designing their systems with unique controls and features that may apply only to their systems. Servicing, installing, and maintaining these new systems can be challenging. Sometimes they require us to reference material provided by the system or component manufacturer. Without this reference material, servicing, installing, or maintaining many of these new systems may be quite difficult or at times even impossible. What is a contractor to do? 


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Ice Breaker: Compressor Short Cycling

By Joe Marchese
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Why does the rapid cycling of a compressor on and off cause it to fail? Rapid cycling can cause a compressor to fail in several different ways. Read on to find out some. 


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Ice Breaker: Refrigerant Safety

By Joe Marchese
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Technicians should make safety a first priority when working on any refrigeration system. There are many potential hazards associated with installing, servicing, and maintaining these systems. One of these potential hazards is the refrigerant within the system.


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Ice Breaker: Selecting Thermostatic Expansion Valves

By Joe Marchese
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One of the basic components selected when installing a walk-in cooler/freezer or any field-assembled refrigeration system is the metering device, typically the thermostatic expansion valve (TXV). The TXV needs to be selected to match the Btu capacity of the system’s evaporator and compressor.


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Rajan Rajendran, newly appointed director of the Emerson Innovation Center, talks about the new $35 million facility and how it will function on the University of Dayton campus. Posted on Aug. 29.

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