Articles by Joe Marchese

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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Ice Breaker: Taking Stock of Downtime

August 4, 2008
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

July 7, 2008
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

June 2, 2008
Technicians servicing refrigeration systems need to be knowledgeable in several different trades, one of which is plumbing.
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