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I have a RUUD Ultra series furnace. I also have a generalair humidifier. Where on the furnace board do you hook up the humidifier leads?

I see HUM STAT and HUM OUT

Let me know.

Cheers,

KW

  • Have you been able to find a wiring diagram for your unit? Sometimes it's on the inside of the access panel. First reaction is that HUM STAT is going to be the wire from the humidistat, and HUM OUT is going to be the signal wire to turn on the humidifier, but that's a cold guess at this point. – JPhi1618 Feb 11 at 20:56
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This control board is providing for you what we call a set of dry contacts, normally open. Depending on how you want to control the humidifier give the board on HUM STAT terminal either full time 24-volts or switch leg from humidistat. Connect humidifier to HUM OUT. Take second leg from humidifier to common of 24-volt supply. Good Luck.

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