Articles by John Tomczyk

The Professor: An Overcharge of Refrigerant

Knowing Symptoms Can Lead to Solutions
September 2, 2013
It is the system check sheet that will tell the service technician whether a system is overcharged or not. Service technicians must install pressure gauges and thermistors — or some other sort of temperature-sensing devices — in order to systematically troubleshoot a refrigeration system correctly.


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The Professor: Flooding and Slugging of Compressors

Understanding the Terms Critical to Troubleshooting
August 5, 2013

Clear, concise, and accurate communication between service technicians, parts suppliers, customers, and the home shop is rapidly gaining importance as the HVACR field transitions and becomes more technically oriented.


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The Professor: Recognizing, Solving Refrigerant Migration

Eliminating Refrigerant from the Compressor’s Suction Line or Crankcase
July 1, 2013

During the off cycle, or especially during a long shutdown, refrigerant will want to travel, or migrate, to a place where the pressure is the lowest. 


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The Professor: Leak Checking a Water-Cooled Condenser

Locating Refrigeration Cycle Leaks May Be Easier Than You Think
June 3, 2013

When a refrigeration system has lost most of its refrigerant charge in a short period of time, the leak is probably significant and should be easy to find.


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The Professor: Three-Phase Motor Voltage Unbalance

Troubleshooting an Overheating Compressor
May 6, 2013

Compressor overheating is usually caused from high compression ratios. High compression ratios can be caused from a combination of high condensing pressures (temperatures) and low suction (evaporating) pressures.


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The Professor: Controlling Evaporator, Defrost Efficiency

April 1, 2013

The evaporator is a major component in the refrigeration system, and an efficient evaporator plays a key role in saving energy. 


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The Professor: Partially Restricted Filter Driers

March 4, 2013

We are going to look at issues related to a partially restricted filter/drier. For this purpose I have included a service checklist as well as a number of illustrations.


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The Professor: Compressor Overheating

February 11, 2013

Compressor overheating is often referred to as the HVACR industry’s most serious field problem.


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The Professor: Compressor Superheated Discharge Temps

January 14, 2013
The compressor’s superheated discharge temperature can tell the service technician what is going on inside a refrigeration or air conditioning system. The compressor’s discharge temperature is a reflection of the hottest part of a refrigeration system, and there are limits as to how hot a discharge temperature should be.


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The Professor: Superheat Amounts and Total Superheat

December 3, 2012
There will always be a time when the evaporator sees a light load and the TXV may lose control of its evaporator superheat due to limitations of the valve and to system instability. What do you do then?


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Michael Willburn, president, Infloor Heating Systems, joins the program to discuss his company, radiant heating, industry trends, and whether contractors are becoming more interested in radiant heating. Posted on July 11.

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