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    ROSSLYN, Va. — The National Electrical Manufacturers Association (NEMA) has announced the publication of NEMA ICS 7.2-2015 Application Guide for AC Adjustable Speed Drive Systems. This guide assists users in proper selection and application of alternating current (ac) adjustable speed drive systems. It covers ac electrical drive systems rated 600 volts or less, consisting of three-phase [...]

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    Superheat Method to Charge A/C Systems

    One of the most important things you can do for your customers is to ensure that their refrigerant system is working properly. Of all the things that can go wrong with an air conditioners refrigerant system, the most common is undercharge. A study commissioned by Arizona Public Service, an Arizona utility, found that more than 70% of split systems tested were at least 5% low on refrigerant. As you[...]

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    The Importance of Liquid Subcooling

    In today’s competitive service market, every conscientious service technician should understand why a refrigeration or air conditioning system must have the proper amount of liquid subcooling. The amount of liquid subcooling not only affects system capacity, but also the effectiveness and capacity of expansion type metering devices. Subcooling is defined as the difference between the measured [...]

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    New PHCC Chapter Organized in South Carolina

    FALLS CHURCH, Va. — The Plumbing-Heating-Cooling Contractors—National Association (PHCC) has announced the formation of the first PHCC-affiliated state chapter in South Carolina. Officially chartered in September 2015 as a PHCC-affiliated association in South Carolina, the chapter has elected officers, identified event goals for 2016, and established a recruiting strategy to bring on new [...]

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