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Have 2 “extra wires” labeled “T”. Help!

Jarper79
Community Member

IMG_8557.jpeg

 hello the last two wires on the right read “t” on both but are different colors. I didn’t see that as an option in the nest compatibility. Anyone know how to proceed? 

11 REPLIES 11

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

@Jarper79 

Those are most likely for an outdoor temperature sensor that the Nest does use and can just be taped off


To ensure that I see your reply, please tag me using @Patrick_Caezza

Cashonkey86
Community Member

The post above by Patrick is correct usually Trane uses this terminal with there equipment but it is not necessary to operate the system with other thermostats such as nest gen 3 leaning tstat

Jenelyn_O
Community Specialist
Community Specialist

Hi there,

 

Thanks for reaching out. I hope you get the answer you're looking for. Please let us know if you still have questions in mind, as we'll be willing to assist you further.

 

I appreciate your help, @Patrick_Caezza and @Cashonkey86.

 

Best,

Jenelyn

Jarper79
Community Member

Additionally this is a heat pump.  And thoughts on the proper placement of the 6 wires needed. 


I tried with the recommended from nest compatibility but on cool it just blew warm air

orange wire-O

red wire-R

green wire-G

yellow-Y1

salmon-C

white-E

 

@Patrick_Caezza 

zoeuvre
Community Specialist
Community Specialist

Hi folks, 

 

@Jarper79, the T terminal is not needed for Nest Thermostat. As I checked for your current thermostat labels, yours is compatible with any of our Nest Thermostat. The wiring of your thermostat wires to Nest should go as: 

 

  • orange wire - O/B or *OB
  • red wire - R or RC/RH
  • green wire - G
  • yellow wire -Y or Y1
  • brown wire - C
  • white wire - * or *OB

 

Let us know if you have any other questions. We're happy to help. 

 

Thanks for your help, @Patrick_Caezza, Jenelyn, and @Cashonkey86

 

Best,

Zoe

zoeuvre
Community Specialist
Community Specialist

Hey Jarper79, 

 

I wanted to check and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.
 

Thanks,

Zoe

Jarper79
Community Member

I have placed wires as described above but my system doesn’t seem to be cooling.

zoeuvre
Community Specialist
Community Specialist

Hello Jarper79, 

 

Thanks for the follow-up. What type of Nest Thermostat did you install? Also, can you help us with your Nest Thermostat's power reading? If you have the Nest Learning Thermostat or the Nest Thermostat E, go to Settings, then look for Technical Info, then select Power. If you have the Nest Thermostat 2020, go to Settings, scroll down to Equipment, then tap Power Info

 

Regards,

Zoe

zoeuvre
Community Specialist
Community Specialist

Hello there, 

 

I wanted to check and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.
 

Best regards, 

Zoe

Jarper79
Community Member

Hello, it’s the most recent version of the thermostat learning , with the blue level.  My  volts looks like 24.

Jenelyn_O
Community Specialist
Community Specialist

Hey folks,

 

I'm sorry for the late response. Please share with us your Nest Learning Thermostat power readings and check your thermostat wiring diagram.

 

You can follow these guides:

 

Check the power readout:

  1. Go to your thermostat Quick View menu.
  2. Go to Settings.
  3. Look for Technical Info.
  4. Select Power.

About wiring diagram:

  1. Go to your thermostat Quick View menu.
  2. Go to Settings.
  3. Look for Equipment.
  4. Check the wiring diagram (ensure that all the wires are all detected).

 

I appreciate your help, Zoe.

 

Kind regards,

Jenelyn