Connect humidifier to nest 3rd Gen Thermo Stat.

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Old 04-08-18, 04:21 PM
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Connect humidifier to nest 3rd Gen Thermo Stat.

Hello All,

I came across this forum after doing some google searching and it looks like PJmax is very knowledgeable and helpful on the subject of humidifiers and thought I would see about getting some help.

I have a new Nest 3rd Gen thermostat and I would like to have it control my humidifier. My current humidifier has a manual control and I believe it is a bypass system as duct work comes out of the air handler around the back and then into the humidifier which is connected to the return I believe.

I'm not sure if I just need to connect the red and white wires from the manual control to the nest or not.

Here's a few photos of how it is currently wired.

Air Handler:
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Transformer I believe ?:
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Wiring at the Humidifier:
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Wiring at the humidistat:
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Humidifier Model:
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Any thoughts on how to wire this to the Nest thermostat would be helpful.

Thanks.
 
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  #2  
Old 04-08-18, 04:28 PM
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Welcome to the forums.

This is a basic setup. The two brown wires on the solenoid go to C on the furnace board and * on the nest. That's it. Absolutely nothing else in line.
There is no polarity as this is AC.

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Old 04-08-18, 05:09 PM
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Thanks for the crazy fast reply. I don't have a C port on the air handler board.

Here's what I got.

On the nest, my blue wire is plugged into the C port. So Im guessing the C wire plugs into the B port on the air handler?
 
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Old 04-08-18, 05:30 PM
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On that Trane control board..... B is the common terminal.
 
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Old 04-08-18, 05:54 PM
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Thank you so much for your help.

One last question I think: should this setting on the Nest be set to Hum. only or Hum. + heat to the right of Activate.

I think it should be set to Hum. + heat, but just want to make sure.

Edit: it looks like humidifier only lets me control the humidifier independently by itself. Humidifier + Heat turns it off and on only when the heater is running.
 
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Last edited by duke69111; 04-08-18 at 06:13 PM.
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Old 04-09-18, 02:10 PM
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I think it should be set to Hum. + heat, but just want to make sure.
That's how I set it up. I only want the humidifier to run when the heat is on.
 
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