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Thread: Nest Installation with Dehumidistat

  1. #1
    Junior Member

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    Nest Installation with Dehumidistat

    Hello,

    I am looking into purchasing and installing a Nest Thermostat.

    My current system is relatively new (house was built in May 2011.)
    The existing thermostat is a normal conventional one.

    I'm wondering, however, if the Dehumidistat right beside it can be wired into the Nest Thermostat as well.

    I understand the concept of wiring a single-wire or double-wire humidifier or dehumidifier into the Nest - I have no problem installing a relay and getting that all setup.

    I'm just wondering if the concept applies to my situation - and if so, do I have a single-wire or double-wire setup - and, if so - which wires are which?

    The thermostat itself is self-explanatory, it has 4 normal wires and a single R-to-Rc jumper.
    But in uncovering the dehumidistat - I see 3 wires (R, G and Y.)

    I'm assuming that the dehumidistat uses 1 wire - and the other two just provide power and common in order to run the blue indication lights. But I have no idea if this is correct (and if so - which wire is the signal?) Or if this is completely wrong and something else entirely is going on.

    Any comments and help would be appreciated.
    Pictures attached for review.

    Thanks for your time,


    -Stile
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  2. #2
    Administrator

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    Do you have a wiring diagram of your life breath dehumidifier that you could upload?

  3. #3
    Member

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    That is a digital dehumidistat which is not compatible with Nest or other standard thermostats/dehumidistats. The control board of you system might have contacts for a standard two wire relay control.

  4. #4
    Junior Member

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    Quote Originally Posted by Thermostat View Post
    Do you have a wiring diagram of your life breath dehumidifier that you could upload?
    I'm not sure.
    I will investigate and let you know - will probably not be until the weekend, though.

  5. #5
    Junior Member

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    Quote Originally Posted by Stuff View Post
    That is a digital dehumidistat which is not compatible with Nest or other standard thermostats/dehumidistats.
    Understood - thanks for the information.

    The control board of your system might have contacts for a standard two wire relay control.
    Ah - this is likely why Thermostat requested drawings of my system as well. I'll see what I can dig up, but likely won't be able to get into it for the next few days.

    Thanks for your time.

  6. #6
    Junior Member

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    I found the wiring diagram. It was printed on the inside of the unit when I opened it up.

    If it helps, this is a LifeBreath "155MAX"

    The 4 cables bundled into the marrettes are as follows:
    1 - The main control unit (previously pictured)
    2 - Main bathroom
    3 - Walk-in bathroom
    4 - Laundry room

    With the other cables (2, 3 and 4) all going to control units in each room specified room - but these control units are not the same as the one previously pictured. These control units are much simpler, just with one button that controls a timer. Hitting the button will cycle through 4 available options: Off; On for a short time (20 min?); On for a medium time (40 min?); On for a long time (an hour?).

    I do see NO and NC connection points not being used on the wire connections on the main unit.
    Perhaps these are the connections you may be referring to?

    Again, any comments on if or how this may be connected to a Nest Thermostat would be appreciated.
    Thanks for your time.



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