Articles by John Tomczyk

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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The Professor: The Scroll Compressor

This is the second of three columns covering the scroll compressor. This article covers the scroll compressor’s advantages and the modulating scroll compressor. The third article will cover digital capacity control for scroll compressors and scroll compressor protection.
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2015 HARDI Fly-In

Highlights from HARDI's Congressional Fly-In in Washington, D.C.

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NEWSMakers: Clint Schreck

Clint Schreck, general manager, Columbus Worthington Air, Columbus, Ohio, discusses winning Angie’s List Super Service Award, how to handle online reviews, and much more.

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2015 May 25

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HYDROCARBON REFRIGERANTS

The EPA has approved several hydrocarbon (HC) refrigerants for HVACR applications. Do you support the use of HCs?
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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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