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    Leon Weis's Avatar
    Leon Weis Posts: 1, Reputation: 1
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    #1

    Oct 21, 2008, 08:39 AM
    Adding a Humidifier to a Armstrong Air Ultra V Tech 80
    I am installing an Aprilaire Humidifier 500a on an Armstrong Air Ultra V Tech 80 furnace. Where do I get the 24 VAC from the heating side of the furnace to feed the humidifier control?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Oct 21, 2008, 09:03 AM

    It wants Common and W from the furnace (this detects heat mode)

    And a separate, independent, customer provided, 24 VAC transformer with a minimum of 12 VA. Standard transformers are about 40 VA. Plug in transformers are available as well as ones that mount on top of a 4" x 4" junction box.
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