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Leon Weis
Oct 21, 2008, 08:39 AM
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?
KeepItSimpleStupid
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.