Extra Edition

Btu Buddy 133: Evaporator Coil Freezing, Low Ambient Problems

By Bill Johnson
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Bob and Tim were on their way to a no cooling call, their first of the season, when Tim asked, “Wonder why we would have a no cooling call this time of year? It is only 75°F during the day and 40° at night.”


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Avionics Mil-Spec Part Solves Commercial HVAC Temperature Stability Problem

Part Maintains Setting and Avoids Repeat Service Calls
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Modifying an off-the-shelf control knob used in avionic systems stopped repeated service calls for a major maker of commercial rooftop units. Electronic Hardware Corp. (EHC) was able to change its standard PT70 control knob to fit on a small circuit board inside the different HVAC models.


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Balancing Legal Marijuana, Safe Workplaces, and Drug Testing Policies

What Employers Need to Know
By Richard D. Alaniz
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More states are legalizing medical marijuana, and recreational use is legal in two others. A tangle of federal laws adds to the confusion. Being aware of the legal issues involved and the changing legal landscape is important for employers to ensure that their drug testing policies are legal and enforceable.


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We Can Eliminate Distracted Driving Today, Says Expert

Actions to Address Driver Distraction
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Government studies show more than 3,000 people die as a result of driver distraction every year. Connected mobility expert Peggy Smedley proclaims the technology to eliminate accidents and deaths due to distracted driving is literally at our fingertips. 


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Air-Fuel or Oxy-Fuel for Soldering and Brazing?

There Is a Time and Place for Both Processes in HVACR Applications
By Jacob Meeker
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For the HVACR technician, the right tool for soldering and brazing pipe — an air-fuel or oxy-fuel torch — depends on the type and diameter of the pipe, its location, and considerations related to cost, safety, convenience, and ease of use. This article will examine those factors, as well as clarify some technical issues.


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Natural Ventilation: Keeping Health Care Buildings Healthy

For an Energy Efficient Solution, Natural Ventilation Should Be Fully Automated
By Chris Monson
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Keeping large buildings well ventilated has always been a challenge. In health care buildings especially, supplying clean fresh air is of utmost importance to prevent CO2 and other contaminants from accumulating. The answer to energy efficient, healthily ventilated ambient environments? Natural ventilation.


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Building Your Brand: Go Big or Go Home

Book Explains How to Build Your Brand into a Major Asset
By Greg Mazurkiewicz
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Many small businesses have plain, nondescript logos, and have built a plain, nondescript brand. In his book, Building a Big Small Business Brand, Dan Antonelli notes that it doesn’t have to be that way. Building a big brand can make a big difference for the small business owner.


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Five Digitally Vulnerable Areas You May be Overlooking in Your Business

List Includes Digital Devices Used Every Day That Could Result in a Security Breach
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According to a recent study by the Ponemon Institute, data breaches cost U.S. enterprises an average of $5.4 million per incident in 2012. Cintas Corp. partnered with the Ponemon Institute to identify five digital devices that are overlooked areas in a business and could be subject to a security breach.


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Btu Buddy 132: Tuning an Oil Furnace

By Bill Johnson
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Tim had asked Bob to go into depth about tuning an oil burner during the last service call. “You said that oil burning equipment requires more attention than any other type of residential heating equipment,” Tim said. “Can you explain why?”


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Technology Advancements Create New Air Curtain Applications

Air Curtains, or Air Doors as They Are Also Called, Are Finding Broader Use
By Stephen Benes
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There has been a deluge of recent technological advancements that are creating new air curtain applications that were barely imaginable 10 years ago. Advancements have ranged from more efficient electric heaters to manufacturing improvements that now extend lengths up to 16 feet.


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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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