Connect bypass humidifier to Ecobee 3 thermostat

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Old 04-08-17, 09:15 AM
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Connect bypass humidifier to Ecobee 3 thermostat

I just installed the EcoBee3 thermostat and I'm attempting to connect my bypass humidifier to it. It doesn't appear to be as simple as the EcoBee instructions make it out to be so I drew up the current wiring. We have a humidistat between the humidifier and it appears a 24v relay in the mix as well. Obviously the Ecobee can replace the humidistat but I'm a little lost with how to wire in the relay or if the Ecobee can provide that function as well and I don't need it at all. I also have an extra brown wire available from the Ecobee thermostat to the furnace for use. Hopefully this only requires one extra wire. Current diagram below.

Any help would be appreciated!

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Old 04-08-17, 09:25 AM
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You have two wires coming from your humidifier.

One wire goes to the C terminal on the furnace.
The other wire goes to ACC+ on the Ecobee.

Set the Ecobee up for single wire humidifier. That's it. nothing else in line.

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Old 04-08-17, 12:08 PM
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This worked perfectly. Seems to come on when humidity is below threshold and turn off when heat is off. Thanks so much!
 
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Old 04-08-17, 02:11 PM
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You're welcome.

That is one plus to using a smart stat.... humidity control.
 
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