If you are primarily a residential technician working on equipment under 5 tons, there is a lot of similarities between the systems you are used to and 5 – 20 ton rooftop units that
are common to the light commercial market.
Highly-efficient AK/AJ condensing units have been added to the Celseon® line of products. Each unit has an ultra-reliable, single-phase, PSC (permanent split-capacitor) motor, which does not require a starter (115V 60Hz and 208-230V 60Hz are available).
Led by the commercial sector, the Architecture Billings Index (ABI) has remained in positive territory four months in a row. As a leading economic indicator of construction activity, the ABI reflects the approximate nine to twelve month lag time between architecture billings and construction spending.
The Sheet Metal and Air Conditioning National Association (SMACNA) is accepting public comments on its HVAC Systems Commissioning Manual. All comments are due on or before the close of business, April 17, to be considered by the task force for inclusion in the newest edition.
Manufacturers continue to make advances in compressors, especially when it comes to efficiency and ease of maintenance. This roundup highlights some of the latest offerings to hit the market, as well as those that will be available later this year.
With a working pressure of 175 psi, the Viridian line of wet-rotor pumps with an ECM motor offers an 80 percent decrease in energy consumption compared to a standard commercial pump of the same size, says the company.
The Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) announced that a public review draft of its HVAC Systems Commissioning Manual (second edition) is available for public review and comment.
On Demand New refrigerant legislation has led to a transition to hydrocarbons as a long term solution for plugin refrigeration systems. For many years, Embraco has been investing in the development of hermetic compressors and cooling solutions for use with natural refrigerants and partnered with OEMs from all continents. Contractors and technicians should expect to see isobutane (R600a) and propane (R290) compressors in the aftermarket with increasing frequency.