I have a Goodman gmpn080-4 furnace and am installing a Skuttle 190-1 humidifier. Where do I wire the two wires from the humidistat to the furnace? I see a 24v HUM screw on the board, but not sure where to place the other wire.
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Some pictures of what you're talking about would help your question– MachavityCommented Jan 28, 2018 at 18:20
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3 Answers
Connecting one wire to HUM and the other to ground worked for us. I believe this is the solution for this furnace, as 'C' (Common) is usually recommended, but this model does not have a connection for that.
The other wire goes to what is called 'common', 'c' for short.
answered Jan 28, 2018 at 2:14
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Thanks — this is the common advice found on the internet, and may help other searchers, but on my system there is no 'common' or 'c'. As we we're testing a few options we discovered that grounding the other wire appears to have been there solution. I suppose this is only applicable on units that include both the 24v HUM connection and no 'c' connection. Commented Jan 28, 2018 at 19:37
Couldn't you just check furnace wiring schematics for "C" common port? Just plug other wire (other than HUM to C area. Right?
Does a common "C" matter to voltage? Such as 24 volt to 24 volt common. Thx