Oil safety controllers often come in two types: bellows (mechanical) and transducer (electronic). Both types of oil safety controllers are referred to as differential-type controllers. The nomenclature comes from the fact that they sense two different pressures; crankcase pressure and oil pump discharge pressure.
Variable-speed compressors in chillers offer benefits including allowing the compressor output to match the demand for cooling and reducing wear and tear on the compressor.
Waterloo Community Schools in Iowa had a number of heating and ventilating units throughout the district that needed replacement. School officials worked with Trane's Des Moines sales office to develop a plan to upgrade the two oldest schools in the district.
In recent years Henry Technologies has undergone an extreme makeover - to the point of the company calling itself ‘The New Henry Technologies' and adopting the slogan, "A 91-year-old startup company."
Energy recovery ventilators (ERVs) fill a need in home ventilation, but a growing number of industry insiders question their installation in homes where cold winters are the norm.
Major League Baseball appeared to open without a hitch; however, behind the scenes in ballparks all around the country, HVAC service contractors were frantically working to ensure that mechanical systems were ready for opening day. In some instances, major renovation was required. One such place was Comerica Park.
Poor indoor air quality (IAQ) is a problem that needs to be met head-on by HVAC contractors, according to Michael Glassco, operations manager for Theodor Sterling Associates. Glassco made his comments during his seminar at the recent CMX CIPHEX Show in Toronto.
Effective HVAC filtration is at the heart of acceptable indoor air quality (IAQ). Filters will only support good IAQ and perform as specified, however, when they are installed and maintained correctly.
Robert Bean, a Registered Engineering Technologist (R.E.T.) and founder of www.healthyheating.com, told attendees of the CMX CIPHEX show that the benefits of healthy heating should be the No. 1 item on the mind of contractors since it is the No. 1 item on the mind of aging homeowners.
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