Technical

Is It Better to Test Ducts with a Positive or Negative Pressure?

August 20, 2012
A very common complaint about duct testing is that the covers get blown off the registers. Most code language leaves the choice of pressurizing or depressurizing up to the tester, but experience has shown that the positive pressure made sealing registers much more difficult, and could triple the time to perform a test.


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What’s Shakin’ with Your HVAC System?

August 6, 2012
Using a vibration tester can enable technicians with no training in vibration measurement and analysis to test pumps, motors, compressors, and other HVAC equipment and get both diagnoses and recommendations for required action on the spot within just a few minutes.


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Food Wholesaler Sees Big Savings, Quick ROI with WiFi-Enabled Thermostats

July 23, 2012
Through the installation of ecobee EMS thermostats in the massive warehouse and office campus of food wholesaler SUPERVALU® in January 2012, the company was able to slash energy usage and realize a return on investment within one week of installing the thermostats.


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Legionella, HACCP, and ASHRAE’s Pending Standard 188

July 9, 2012
If properly followed, American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 188 stands to affect the way water systems are managed in hundreds of thousands of buildings in the United States.


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Air Infiltration Testing: Five Reasons Why You Should Do It

June 18, 2012
Energy codes are emerging or being updated nationwide. As air leakage testing becomes a requirement, some testers wonder what value it adds over informed visual inspections. Here are five reasons why blower door and duct leakage testing actually saves auditors’ and homeowners’ time and money.


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Evaporative Condensing Energy Efficiency

June 4, 2012
Due to escalating energy costs over the past several years, supermarket chains are exploring new equipment designs to reduce their energy consumption. This article provides a detailed comparison of a typical supermarket refrigeration system designed with air-cooled condensers versus one with evaporative condensing.


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The New One-Two-Three Punch to Knock-Out IAQ Problems

May 21, 2012
Indoor air quality (IAQ) products such as germicidal ultraviolet (UV-C) lights, gas phase air purification, and photo catalytic oxidation (PCO) have given contractors a “one-two-three punch” to help customers battle allergens, pathogens, odors, and other pollutants commonly found inside residential and commercial buildings.


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The Double Benefit of Monitoring Indoor Air Quality

May 7, 2012
It is a difficult balance to save energy and money yet maintain a comfortable and healthy indoor air environment. A logical solution to controlling indoor air pollution is good ventilation coupled with indoor air quality (IAQ) monitoring using gas sensors. This can ensure healthy indoor air as well as a more efficient HVAC system.


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Controller Delivers Energy Savings, Tighter Temperature Control, and Eliminates Icing Issue

April 23, 2012
With ongoing refrigeration system problems, and no replacement parts available for its old Beacon systems, the McDonald’s owner in Godfrey, Ill., looked to the ingenuity of its service company, R.E.C. Service Corp., for a solution.


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Ductwork Helps Solve Lab Construction Challenge

April 9, 2012
Firespray International has provided an innovative lab exhaust ductwork system for the University of California, Berkeley’s (UC Berkeley) Helios Energy Research Facility, solving a complex construction challenge at the 113,000-square-foot building under construction in downtown Berkeley.


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