9 Comments


  1. kjake

    Thanks for posting this. Installed the same humidifier today without any issues – worked the first time. One change that I made was: my Common/C terminal is already connected to the Ecobee EI’s 24V terminal block, so I just kept the wiring inside the EI from the humidifier’s solenoid and connected one lead to the ACC1 and one of the 24V part that lead to Common/C.

    Reply

    1. Hey, Kevin. Congrats on the successful install! And yes – connecting to the COM terminal inside the Ecobee EI is just as good as connecting to the COM on the furnace’s control board! The COM is “common” to a lot of connections! :)

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  2. Craig Hairrell

    I’m not sure I’d bother with this. Looking at the statistics of how efficiently my bypass humidifier adds moisture without the furnace supplying heat, it doesn’t look too good. In about 90 minutes with the furnace and humidifier running nearly constantly, it raised RH by 6%. That same day, in a 75 minute period, with just the fan and humifier running, it raised humidity by only 1%. I can even find periods where the humidity drops with the fan and humidifier on. I’m turning on the option to humidify only when heating. It looks like a waste of water and electricity to do otherwise.

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  3. Going to do this today. I picked up a Trion Mister-Mini due to space constraints. We’ll see how well it works.

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  4. Michael

    Not sure what happened to my set up. I have 2 stage heat and single cool. I hooked everything up as shown in the install manual. After registering etc, everything worked great. Then I tried to hook my dehumidifier. I again followed the install in the manual. Hit the power and all looked good. First time furnace called for heat, humidifier kicked on, but seconds later, smoke was emanating from the interface board, I took off the cover and saw that little green thing next to ACC3 bright orange, then it popped and caught fire and I hit the breaker off! I assume that port is fried. But what the heck happened??? Do I dare hook it up to one of the other slots? I don’t have plans to hook air to air up as you can’t turn it on from mobile only at thermostat. May want to hook up try switch for warning of sump pump. But for sure want humidifier hooked up….help,please

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  5. Mark

    I was looking to purchase the older model (Smart Si), becuase I could get a good deal on one, and I wanted it to control my humidifer, which this covers. However, the Ecobee web-page implies the thermostat already has humidity contoro: https://www.ecobee.com/how-we-are-smarter-smart-si/ where it states it has “Optimal Humidity: Smart Si regulates indoor humidity to prevent frost buildup on windows when it’s cold outside and high humidity indoors.” I’m confused? Can the Smart Si thermostat control humidity out of the box, or not? Has anyone come across it’s logic for controling humidity levels in cold weather? I live in Minnesota, and when the temperature drops below 0F, I need the logic of the thermostat to bring the humidity down otherwise you face condensation. Hmm… maybe I’ll post this to the Ecobee Knowledge Center – just curious if there were any thoughts. -Cheers!

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    1. Mark

      Sorry – confusion between the “Smart” and “Smart Si” abounds – I get it now, this blog past was for the “Smart.” Although, the Ecobee link remains elusive by stating the “Smart Si” regulates humidity – but even the Ecobee pages point out the Smart Si does NOT have humidity control. I think there’s room for confusion on how the Smart Si can prevent frost buildup yet not have any control over a humidstat. Humpf.

      Reply

      1. Hi, Mark. The Smart, Smart Si, and the ecobee 3 will all control a humidifier without need for any additional hardware. The Frost Control feature (also on all units) will allow the thermostat to adjust the target humidity based on two variables: the efficiency of your windows (set by you) and the external temperature that it reads off the Internet. A little tinkering with the window efficiency setting is required, but once you find the right setting, you’re good to go!

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