Nest thermostat & dual fuel heat pump question

Old 10-31-16, 12:15 PM
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Nest thermostat & dual fuel heat pump question

I'm wanting to install (3) Nest (gen 3) thermostats in a home that has (3) floors. First and second floors have Trane thermostats with the current wiring setup. My question is, how would I wire up the nest thermostats with the current wiring configuration listed below. I attempted to wire them up using the heat/cool wiring diagram, and didn't think about it being a dual-fuel system needing a heat pump and so that changes things drastically... Any help would be so greatly appreciated!

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The third floor has a Honeywell thermostat using a 2h/1c auxiliary configuration.

I unfortunately don't have a picture of the wiring for the third floor, but if I can get the first and second floors figured out I can come back to the third floor later. Since the first and second floors use the same thermostat and wiring configuration, they will be the easiest.

Additional information:

      If there's anything else I can provide as far as additional information goes, just let me know and I'll get what I can posted on here for you guys.

      Thank you ahead of time for any help anyone can provide, I'm in a time crunch so getting this figured out sometime this week would be a huge help.

      Old 10-31-16, 06:11 PM
      PJmax's Avatar
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      Welcome to the forums.

      You'd follow the heatpump designations.... not heat/cool.

      We need to know what current stat you are using there.... make and model #.

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      Red --------> Rc
      Blue -------> Y2
      White ------> W1
      Orange ----> O
      Green ------> G
      Black ------> B

      The fact that your system uses an O and B switching is a problem.

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