The Blog

Why Your Freeze Stat Trips

A freeze stat is a sensor located in your HVAC system that is designed to minimize the potential of freezing a water or steam coil in your air distribution system.  A true freeze stat is directly interlocked to shut down equipment and requires a manual reset if it trips.  This is different than a low

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Electronically Commutated Motors

Electronically commutated motors (ECMs) have quickly become standard in the HVAC industry. They can have unexpected operating characteristics that are very different than their predecessor; the alternating current (AC) permanent split capacitor (PSC) motor. An ECM is a brushless, direct current (DC) motor that operates at a synchronous speed. ECMs utilize integral inverters so they

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Natatorium Corrosion Is A Medley of Factors

Natatoriums are typically the most corrosive environment that facility staff will maintain. The design architect, HVAC engineer, and pool consultant need to reduce the factors that lead to corrosion, but all the designers involved and the facility personnel need to be keenly aware of the cause of natatorium corrosion. The primary drivers of corrosion in the natatorium

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Relative Humidity is “Relative”

Psychrometrics can be a complicated field of study. However, a psychrometric chart can be a simple, invaluable tool to help HVAC engineers and owners understand the relationship between air temperature and humidity.  Relative humidity (RH) is a term that most people are familiar with, but its relationship with dry bulb (DB) temperature is typically under-appreciated.  RH

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The Days of the Simple Wall Switch Are Gone!

The days of providing a simple wall switch to control lighting are GONE. The last few revisions of the energy codes, whether the International Energy Conservation Code or ASHRAE 90.1, has continually increased lighting control complexity. However, with this complexity significant energy reduction, and thus lower operating costs, can be achieved resulting in relatively short

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High Efficiency Replacement Boilers

As we leave the heating season, many building owners begin repair and replacement projects in their boiler plants. Boilers that burn fuel to heat water have been around for thousands of years and technologies that we would recognize today date back to the early 1700’s. More recent trends in boiler construction and control focus on

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Training Saves The Day!

At the end of most construction projects, there is a warranty period, but not all mechanical failures and problems occur within the warranty period. Sound familiar? One option is to get a service agreement from another company or local contractor; however this can be costly, especially if only minor repairs are required when the building

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WELCOME 2012! Are You Ready For A Change?

No, we’re not trying to make a political statement. Whether or not there will be a change in the White House this year, there are changes coming for the construction industry. In 2012, the new version of the International Building Code (IBC) family is being issued. Depending on your jurisdiction, the 2012 version of the

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Building Information Modeling (BIM)

Many times we hear the term BIM. But what does this mean? When an owner asks if the project is going to be done in BIM, what is he really expecting? The AIA has a document, E202-2008 “Building Information Modeling Protocol Exhibit”, which provides a standard outline for the use of BIM information by a

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Retro-Commissioning Results

The graph demonstrates the results of retro-commissioning for one rooftop unit. The retro-commissioning authority found improper damper operation in economizer mode. Instead of fully opening the outdoor air damper to provide free cooling, the actuator fully closed the outdoor air damper and provided 100% return air to the space. Mechanical cooling was required at an

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