Articles by John Tomczyk

The Professor: Variable-Frequency Drives

By John Tomczyk
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The HVACR industry is one where both centrifugal pumps and fans are used on an ongoing basis. Because of this, HVACR systems are huge energy consumers. Creating higher-efficiency systems offers a tremendous opportunity for great electrical and monetary savings. Many of these savings can be achieved through the use of variable-frequency drives.
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The Professor: Retrofitting R-22 Systems

By John Tomczyk
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As mentioned earlier, most new systems will be manufactured with R-410A. However, the question of what is the best retrofit refrigerant blend for existing R-22 systems is often asked by technicians and equipment owners. There is no one quick-fix solution or answer to this question. The answer depends on several key factors.
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The Professor: Explaining the R-22 Phaseout

By John Tomczyk
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With so much talk these days about HCFC-22, I thought I’d offer a back-to-basics look at this refrigerant that has been so popular for so long - but now is facing phaseout.
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The Professor: Comparing HFC-134a to R- 12

By John Tomczyk
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HFC-134a is the alternative refrigerant of choice to replace CFC-12 in many medium- and high-temperature stationary refrigeration and air conditioning applications. However, R-134a is not a direct drop-in refrigerant for R-12. Retrofit guidelines must be followed carefully when converting a system from R-12 to R-134a.
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The Professor: Replacement Blend HFC-410A

By John Tomczyk
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This article is the first in a series focusing on refrigerants and refrigerant blends. This month’s article will concentrate on the HCFC-22 air conditioning replacement refrigerant blend HFC-410A, better known as R-410A.
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The Professor: Restricted Airflow Over an Evaporator

By John Tomczyk
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There are a number of ways that the airflow over an evaporator can become restricted. Anytime the evaporator coil sees reduced airflow across its face, there will be a reduced heat load on the coil. No airflow will cause a lot of the refrigerant in the coil to remain a liquid and not vaporize.
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The Professor: Defrost Termination/Fan Delay Controls

By John Tomczyk
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The defrost termination/fan delay control is a temperature-activated, single pole-double throw switch controlled with a remote sensing bulb. The control can be an adjustable type. One example of the installation of an adjustable defrost termination/fan delay control is on a walk-in freezer’s evaporator.
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The Professor: Compressor Amperage Curves

By John Tomczyk
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Compressor performance curves are available from the compressor manufacturer for each of their compressors. Compressor data comes in either graph or table type. This article will take a closer look at the table type data and concentrate on the current (amps) performance data.
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The Professor: Condenser Efficiency Affects the System

By John Tomczyk
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One of the main components of any refrigeration or air conditioning system is the condenser. As its name implies, one of the main functions of the condenser is to condense the refrigerant sent to it from the compressor. However, the condenser also has other functions.
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The Professor: Scroll Compressor Internal Protection

By John Tomczyk
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Many modern day scroll compressors incorporate a variety of internal safety controls that can actuate the internal line break motor protection. Some safety features that can be found in the air conditioning scroll less than seven tons are described here.
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