Articles by John Tomczyk

The Professor: Bad Compressor Valves

November 7, 2011
Many servicemen experience service calls where the compressor has both a low head pressure and a high suction pressure. There are three main reasons why a compressor will simultaneously have a low head pressure and a high suction pressure.


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The Professor: Systematic Troubleshooting of a Restricted Liquid Line

October 3, 2011
The problem in this scenario is a restricted liquid line after the receiver. Where do you go from here?


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The Professor: Chemical-Free Cooling Tower Treatment

September 5, 2011
When evaporation occurs in a cooling tower, only the water evaporates; it exits the cooling tower as water vapor, but leaves the minerals behind to concentrate in the cooling tower’s water system.
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The Professor: Loss of Air Conditioning Cooling

August 1, 2011
For this column I want to discuss a real life situation regarding poor cooling in a residence and reduced airflow coming from the registers in the house. The air conditioner is a three ton (36,000 btuh), HCFC-22, split type, air conditioner with the A-coil in the plenum of the furnace located in the basement.
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The Professor: Basics of Condensers and Coils

July 4, 2011
The condenser is the component that rejects the heat from the system. Most equipment is air cooled and rejects heat to the air. The coils are copper or aluminum and both types have aluminum fins to add to the heat exchange surface area.
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The Professor: Going Chlorine-Free in Retrofits

June 6, 2011
Ferris State University’s Commercial Refrigeration Laboratory has gone totally chlorine-free. By replacing the refrigerant HCFC-22 that was in two medium-temperature commercial refrigeration cases in the laboratory, the students in the associate degree program in HVACR can boast that the lab is now chlorine-free.
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The Professor: Condenser Splitting

May 2, 2011
This column focuses on condenser splitting. But first, here’s a quick review of condenser flooding before covering condenser splitting to help all better understand both concepts and their advantages and disadvantages.
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The Professor: More Ice Flake Machine Troubleshooting

April 4, 2011
This article is part two of a two-part series on ice flake machine troubleshooting.  The last article, which appeared in the Feb. 7 NEWS, examined troubleshooting low and high water levels. This article will examine water impurities and mechanical problems.
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The Professor: Compressor Amperage Data

March 7, 2011
My Feb. 7 column focused on ice flake machine troubleshooting. I will have more to say on that specific topic in my April 4 column. For this column, I want to take a look at amperage as it relates to HVACR compressors.
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The Professor: Ice Flake Machine Troubleshooting

February 7, 2011
This article is part one of a two-part series on ice flake machine troubleshooting. This article will examine troubleshooting low and high water levels. Next month’s article will examine water impurities and mechanical problems.
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