Articles by Joe Marchese

Ice Breaker: How Automatic Expansion Valves Work

The automatic expansion valve (AXV) is similar in construction and appearance to the commonly used thermostatic expansion valve (TXV). However, the metering devices operate much differently.
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Ice Breaker: Replacing Cap Tubes

A popular metering device used on many fractional horsepower refrigeration systems is the cap tube. But one field problem encountered with this type of metering device is that it can become plugged with system debris, causing a restriction.
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Ice Breaker: Work Smarter, Not Harder

Technicians need to work smarter, not harder. One major difference between an inexperienced tech and an experienced one is that the experienced tech works smarter. Here are some ways a technician can work smarter and become more efficient.
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Ice Breaker: Refrigerant Numbering System Explained

There are many different types of refrigerant used in our industry today. They are produced by several different manufacturers and have numerous ways of identification. One proper method of identification is referring to a refrigerant by its ANSI/ASHRAE designation.
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Ice Breaker: Evacuation Speed Up

Evacuating a refrigeration system can be a very time-consuming task. There are several factors that influence the speed of this process. A technician has no control over many of these factors, but there are some areas in which he can help speed up the process.
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Ice Breaker: PTC Starting Relays

One type of starting relay used on fractional horsepower compressors is the positive temperature coefficient (PTC) relay. It performs the same function as a current relay or potential relay but in a much different manner.

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Ice Breaker: Taking Stock of Downtime

During the normal course of servicing and installing refrigeration systems, there are times when a technician will need to wait before proceeding to the next task. These downtimes do not need to be wasted time.
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Ice Breaker: Thinking Outside the Box

Repairing refrigeration and air conditioning systems is not always an easy task. Occasionally technicians will encounter multiple problems on one system. If all of these problems are not initially discovered and resolved, the unresolved ones could lead to problems and more costly repairs.
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Ice Breaker: Condensate Drain Lines

Technicians servicing refrigeration systems need to be knowledgeable in several different trades, one of which is plumbing.
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Ice Breaker: Servicing Special Systems

Our industry has many different types of specialized refrigeration and air conditioning systems. Servicing and maintaining these systems normally requires a higher level of expertise than generic systems. Depending on the application, these systems can operate quite differently from generic systems.
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Scenes from the 2014 World Energy Engineering Congress in Washington, D.C.

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NEWSMakers: Kari Arfstrom

Kari Arfstrom, executive director of the HVACR Workforce Development Foundation, talks about the upcoming HVACR & Mechanical Conference. Posted on Jan. 23.

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