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    lehew's Avatar
    lehew Posts: 1, Reputation: 1
    New Member
    		  
    #1

    May 10, 2011, 12:18 PM
    Rudd ac questions?
    I have a new rudd air handler and 4 ton compressor, when the unit turns off there is a slight grunt noise. Installer says there is an electric brake on the blower at shut down ,this sounds good but is it true noise is not very loud ?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    May 10, 2011, 07:39 PM

    If you have a variable-speed indoor unit, the sound you hear is not unusual. DC motors have much stronger magnets than AC motors, and a pulsing sound at start-up & during coast-down is inherent to these types of motors.
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