Nest + Humidifier Clarification

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Old 01-23-13, 11:22 PM
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Nest + Humidifier Clarification

I'm trying to get a Nest hooked up with a whole-home humidifier in the mix. I've been back and forth through the forums, and can't quite put the pieces together for wiring my system up.

This post http://www.doityourself.com/forum/humidifiers-dehumidifiers/486736-wiring-nest-2nd-generation-thermostat-humidifier.html seems to capture the 2 options clearly, and I think that my humidifier is passive, but I can't figure how the 24vac (shown below) fits in the mix.

My simple questions are:
1. Based on this equipment, do I need a relay?
2. How does the 24vac fit into the wiring scheme?

*Furnance/HVAC: *
Rheem RGPH-10EAMER
http://www.rheem.com/documents/rgph-specification-sheets

*Humidifier: *
Autoflo 200p
http://www.bestairpro.com/Portals/0/manuals/autoflo200p/200P-800BP-97%20Owners%20Manual-%20Email.pdf

*24vac:*
Image here: https://www.dropbox.com/s/8oiz1k2a0c130ub/24vac.JPG
On the back side of the 24vac:

Black -> HUM and White -> Neutral.
On the front side:
White -> Humidistat
Red -> Humidifier

Thanks very much for looking at this.
 
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Old 01-26-13, 06:28 PM
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You would not need a relay.. You'd wire it up as you saw in the photo, and that would be the top one.

The transformer that's there now, can be removed from the system.

So you wire one side of the humidifier to *, and the other side to C at the furnace.
 
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