Neat 3rd Gen Wiring for Trane Heat Pump

[Priusux]

Wanting to see what proper wiring should be.  Going from a Honeywell thermostat on our Trane Heat Pump system.  Wiring is shown in picture for our existing Honeywell.  Thought I had wiring right on Nest but could ever get cold AC to work.

 

[Patrick_Caezza]

Give this a try

Black - E to * (set as Emergency heat)

White - AUX to W2/AUX (set as AUX heat)

Orange - O/B to OB

Blue - C to C

Yellow - Y to Y1

Red - R to Rc (jumper to Rc not needed)

[Priusux]

That’s how I originally set it up and it would throw anything other than heat.  Was giving heat regardless if I had it to cool or heat.

[Priusux]

That’s how I originally set it up and it would throw anything other than heat.  Was giving heat regardless if I had it to cool or heat.

[Patrick_Caezza]

Give this a try,

If your system starts to blow cool air when your Nest thermostat is in Heat mode (or if it blows warm air when its in Cool mode), change the settings for orientation of your heat pump.

1.  On your thermostat, go to Settings.
2. Select Equipment.
3. Select Continue > Continue.
4. Select Heat Pump.
5. The Nest Thermostat defaults to an O setting for heat
   pumps. 
   • If the O option is highlighted, select B.
   • If the B option is highlighted, select O.
6. Test your heating and cooling again to make sure the issue is resolved.

[Priusux]

Tried this and still only blows hot air

[Patrick_Caezza]

You are going to need to look and see how the terminal block on the control board in the furnace/air handler is wired. That brown wire that is just hanging there is bothering me.

Try connecting the Red, Yellow, and green wires together and see if it blows cool air, if it doesn't, add the orange wire. If it still doesn't then you might have a problem with your system

Be sure to power off your system before messing with the wires.

[Priusux]

Will give it a try.  The system works with the Honeywell thermostat.  Just wanting to use the nest to lock our daughter out of changing it.

[MelbaDT]

Hey folks, 

Thanks for lending a hand, Patrick_Caezza. 

Priusux, I'm jumping in to ensure everything is good here. Have you had the chance to try Patrick's suggestion already? If yes, how is your thermostat now?

Best, 

Melba

[Priusux]

I have not had a chance to try it yet.  Not sure how I am going to get multiple wires into one of the holes on the nest as one wire barely fits

[MelbaDT]

Hey there, 

Sorry for the confusion — you shouldn't place multiple wires into one terminal slot. It should only be one wire per terminal. However, what Patrick's suggestion is as follows:

1. Turn off your breaker.
2. Try to connect the Red, Yellow, and green wires and leave the others for the meantime.
3. Turn on your breaker and observe if it blows cool air. 
4. If it doesn't, turn off your breaker again then connect the orange wire. Turn back on your breaker then observe what happens. 

Best, 

Melba

[MelbaDT]

Hey Priusux, 

It's me again — how's it going now? Still need our help?

Best, 

Melba

[MelbaDT]

Hi, 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Best, 

Melba