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    gbl1981's Avatar
    gbl1981 Posts: 1, Reputation: 1
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    #1

    Oct 22, 2006, 01:25 PM
    Humidifier Power
    I have recently installed a whole home humidifier that runs on 24 VAC. I currently am running it off a power brick plugged into a standard 120VAC outlet. I would like to set up the humidifier such that it only runs when the blower is running. I have put a meter across the C and G terminals where the thermostat is wired in and noticed that when the blower is on there is 24VAC across the terminals. When the blower is not running there is 0 volts across the terminals. Can I wire my humidifier directly across these terminals? I'm just curious if those terminals are meant to drive anything. It appears that the humidifer draws about 200 milliamps.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #2

    Oct 22, 2006, 03:14 PM
    What is a power brick? Does your furnace have a PC board or fan control board?
    Just hook up the primary of a 24V transformer to your heat speed terminal and nuetral. When ever the heat calls for heat/blower it sends 120v to the blower and powers the transformer, pretty simple huh?
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