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    Jeremy126's Avatar
    Jeremy126 Posts: 13, Reputation: 1
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    #1

    May 24, 2010, 01:58 AM
    Trasformer buzzing?
    It's it common for transformers to buzz? I hear it when the unit isn't running think it always does it on or off.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 24, 2010, 04:35 AM
    Quote Originally Posted by Jeremy126 View Post
    It's it common for transformers to buzz? I hear it when the unit isn't running think it always does it on or off.
    Transformers are always powered on so the low voltage control system can send and receive signals to operate the system itself. They will make noise since most of them are from China now and the metal plates that help make the core of the transformer shell are not manufactured with tight enough specifications.
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