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I’m installing a Generalaire 1042 drip humidifier. The wiring instructions aren’t that clear/detailed.

The thermostat is MHX3C. It has connections C, NC and NO.

The furnace is a Keeprite C9MPD075F12B1. The furnace has the standard R, G, Y, W, C connections.

I’m trying do the wiring between the humidistat and solenoid and furnace.

Any help would be appreciated Thanks.

Note: I’ve given up (I normally don’t so easily, but for reason I’m not into it this time), so I’m going to have someone come in a do the work for me.

Furnace circuit board: enter image description here enter image description here Humidistat: enter image description here Furnace wiring diagram: enter image description here

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  • The pics are great! Are we to presume that the first is the board of the humidifier and the second is the furnace?
    – FreeMan
    Commented Feb 1, 2022 at 17:09
  • Both are from the circuit board on the furnace. I’ll post a humidistat pic in a moment.
    – Oldoldhouseguy
    Commented Feb 1, 2022 at 17:14
  • Thanks. Always good to put a text label above or below the pics so people know what they're looking at.
    – FreeMan
    Commented Feb 1, 2022 at 17:15
  • Are you stuck with that particular thermostat? It sounds like it's not really designed for the application at hand...
    – ThreePhaseEel
    Commented Feb 2, 2022 at 1:18
  • Thanks for the input guys. I’ve decided to back out of DIYing this. I’ll have someone come in to do the. I know it will be a simple hookup once the wiring is confirmed but id rather have someone else responsible for burning up the furnace circuit board!! I’ll close the question....once I figure out how to do it!
    – Oldoldhouseguy
    Commented Feb 2, 2022 at 17:49

1 Answer 1

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Generalaire products are not very DIY friendly. In the rare event someone has a similar problem I'm posting this. The diagram is for your model humidifier and humidistat. The hard part for a DIY'er is finding the right terminals on the furnace board. Since you posted the wiring diagram for the board someone more knowledgeable than me could figure it out in two minutes and determine which terminals to use on the board. Wiring Diagram

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