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Thread: Honeywell + Lennox > Nest 3rd gen

  1. #7
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    Ok, I got it: the u1 wire on the Honeywell VisionPro 8000 is connected to an Honeywell Economizer Automatic Round Damper (EARD). It is basically ventilation to our home. The Honeywell t-stat works with the Ashrae 62.2 ventilation regulation, so the u1 wire (which is a relay) opens and closes this damper to make get fresh air from outside. I am still trying ti figure it out how to connect Nest t-stat to this ventilation system. Any ideas? Thank you.

  2. #8
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    Anyone figure this out?

  3. #9
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    I too am trying to figure this out. I have two thermostats, one with normal wiring and one with two U1 wires. Anyone get this to work?

  4. #10
    Junior Member

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    I have a Lenox control board for the electronic dampers. Nest will not work with Lenox boards.

  5. #11
    Junior Member

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    did anybody figure out the U1 issue? help help
    help!!!

  6. #12
    Junior Member

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    Any Updates on this ?

    Quote Originally Posted by myrtillerose View Post
    Although I can see a humidity reading, I cannot control it.. so I can only assume that I do not have a humidifier/dehumidifier and those wires must be for a stage of cooling or heating (as the terminal guide and you said). I spoke to Nest support today and, in light of this, they recommended simply disconnecting the U1 wires and taping them. Seems a little strange to me to just disconnect wires without knowing exactly what they do, don't you think? I set up a free "orientation" with the company that installed the HVAC so hopefully they'll be able to give me some insight.






    If anyone has any other thoughts, I would really appreciate it. Thank you!
    Anything after the HVAC orientation ?

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