Articles by Joe Marchese

Ice Breaker: Troubleshooting Potential Relays

July 6, 2009
Many low and medium temperature single-phase compressors require some type of external relay to assist in the starting of its motor. The purpose of this relay is to remove the motor’s start winding, start capacitor, or both, from the circuit once the motor is running.
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Ice Breaker: Evaporator Superheat Explained

June 1, 2009
In a properly operating system, the refrigerant will be in a superheated state from the last section of the evaporator to the first section of the condenser. Technicians can measure the superheat condition anywhere along this path. One common location is at the outlet of the evaporator.
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Ice Breaker: Ask Why the Failure Happened

May 11, 2009
A service technician should not only fix the problem but also, to the best of his ability, ensure the system operates reliably. This means once a technician identifies the system problem, he should try to discover why the failure occurred and what can be done to prevent it from happening again.
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Ice Breaker: Reading Ladder Diagrams

April 6, 2009
Being able to efficiently interpret ladder (line) diagrams is an important part of electrically troubleshooting many HVACR systems. These diagrams are drawn in such a format that it is quite easy to understand the electrical configuration of the system.
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Ice Breaker: How Automatic Expansion Valves Work

February 2, 2009
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

January 12, 2009
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

December 1, 2008
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

November 3, 2008
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

October 6, 2008
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

September 1, 2008
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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Doug Dougherty, president and CEO of the Geothermal Exchange Organization (GEO) joins the program to discuss the latest happenings with GEO, including the drive to get included in state and federal definitions of renewable energy, plus the future of geothermal.  Posted on July 25.

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