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    Nelson Mechanical Design
    The dreaded F4 error code returns!
    Nelson Mechanical Design
    Actuators were slow opening with spring return.
    Nelson Mechanical Design
    The restored system, Note the strut framework to keep the exchangers off the pad.
    Nelson Mechanical Design
    Three new Multiaqua 5-ton chillers.
    Nelson Mechanical Design
    Chilled water pumps without pressure gauges—we routinely use a test gauge on circulators so we can determine system flow from the pump curve.

    Brian Nelson

    Brian Nelson is the co-owner of Nelson Mechanical Design, a “green” mechanical contractor serving the energy efficiency and home comfort needs of Martha's Vineyard, MA since 2004. The company designs, installs, and services just about anything to do with heating, cooling, domestic hot water, water treatment, geothermal, heat pumps, and radiant. NMD is committed to preserving the fabric of the Island it calls home. To learn more visit nmdgreen.com.