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I have two zones in my house with a damper system and want to move away from using my humidistat to control the solonoid valve on my humidifier and instead use my Nest thermostats.

My zone control panel has a spot for a humidifier control, but I'm not certain how it works so I never hooked it up. My only thought is that the W heat wire triggers it to turn on. Since the Nests measure humidity, they'll be more accurate anyway.

If I had only one Nest thermostat, a simple 24V relay would suffice, but I have 2. I want it so if either thermostat turns on the humidifier, then the humidifier turns on.

I don't know enough about electrical engineering to figure out a good solution to this problem.

Another idea is to buy another zone control panel and only hook up certain wires to fake it.

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  • What make and model is your existing zone control board? Commented Jan 19, 2020 at 13:49
  • @ThreePhaseEel My zone control board is the Aprilaire 6404 Commented Jan 19, 2020 at 20:42
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    So two 24V relays, each one thrown by a Nest. Commented Jan 19, 2020 at 22:17
  • BTW: I'm not seeing anything in the Aprilaire 6404's manual about it being able to control a humidifier Commented Jan 20, 2020 at 3:34
  • @Harper-ReinstateMonica How would I do it with two relays? Could you post a solution with an image showing how I'd wire something like that? Commented Jan 22, 2020 at 4:34

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