David Callender

David Callender is a NATE-certified technician with more than 30 years of service experience in commercial HVACR. He is a Certificate Member Specialist of RSES and is a technical support supervisor for ICOR International. For more information, go to www.icorinternational.com.

ARTICLES

The Way You Recover R-22: Does It Save Time or Is It a Shortcut to Failure?

By David Callender
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Whether we like it or not, R-22 is going away, and technicians need to look at their best options and solutions to work with the phaseout. One option available to all competent service technicians is to recover and recycle refrigerant.


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TXV Retrofit Kits Save Energy

By David Callender
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Independent testing on three different types of residential equipment has shown a 15-26 percent increase in efficiency just by replacing the fixed-orifice-metering device with a new TXV valve. No other work was done to this equipment to increase the EER.
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2014 Energy Efficiency Forum

Highlights from the 25th annual Energy Efficiency Forum in Washington, D.C.

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NEWSMakers: Joseph Groh

Joseph Groh, an industry veteran boasting 35 years of HVAC experience, discusses the 2008 bicycle accident that cut his career tragically short, and how the Joseph S. Groh Foundation is his way of giving back to the construction trade. Posted on Aug. 22.

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2014 August 18

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Prohibiting HFCs

EPA is proposing a rule that would prohibit some HFCs in select refrigeration applications. Do you agree with this move?
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2014 National Plumbing & HVAC Estimator

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