Articles by John Tomczyk

The Professor: Variable-Frequency Drives

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

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: Comparing HFC-134a to R- 12

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: Compressor Amperage Curves

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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2015 HARDI Fly-In

Highlights from HARDI's Congressional Fly-In in Washington, D.C. Post date: May 28, 2015.

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NEWSMakers: Kevin Conrad
Kevin Conrad, president, Kevin Conrad Heating and Cooling Inc., Nantucket, Massachusetts, breaks down working in the New England climate, the benefits of insulation foam, and more.


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2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

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