How to wire new Nest Thermostat

[jono428]

I reached out to customer chat this morning and was told my system is compatible and an email with wiring instructions would be sent but I never received it. Can anyone help. I have a Carrier Model 58CTW/CTY Furnace and Model 24ACB3/24CC6 AC. Thank you.

[CoolingWizard]

@jono428 ,

That looks like an Ecobee thermostat. The ACC+ and ACC- power an accessory like a humidifier.  You need to identify what the ACC wires are powering so we can advise how to wire that accessory to the Nest Learning Thermostat.

AC Cooling Wizard

[jono428]

Sorry, it’s a Carrier TP-WEM01 thermostat and yes I have a whole house humidifier. 

[CoolingWizard]

Does the whole house humidifier have its own humidistat?

AC Cooling Wizard

[jono428]

Nothing that I control independently. I just open the vent in the winter and change the filter.  

[CoolingWizard]

@jono428 ,

can you follow the cable and see if the two wires both go to the humidifier?  It is likely the Orange and the Brown wire will be cross-connected to a second cable going on to the humidifier.  Can you possibly confirm that?

AC Cooling Wizard

[zoeuvre]

Hi folks,

@jono428, thanks for reaching out, and for showing interest in our Nest Thermostats. I want to check if you managed to see the response above. Please let us know if you still have questions or concerns, as we'll be willing to assist you more. 
 

I appreciate your help, @CoolingWizard. 

Best,

Zoe 

[jono428]

Thank you. Yes, I saw the response. I’m not sure how to go about following the wires so when I have more time I’ll take a look. 

[CoolingWizard]

When I say follow the wires, I should have stated, go to the indoor air handler and verify the connections. Need to see where the Orange and the Brown wires are connected to 

AC Cooling Wizard

[jono428]

Here is a picture of what is running to the humidifier

[CoolingWizard]

That is just a water solenoid valve. Energizing that simply turns the water to the humidifier on.  

AC Cooling Wizard 

[jono428]

Ok. Here's a picture of the inside of the air handler. 

[CoolingWizard]

You have a 2-stage gas furnace.  There should be a control board where the wires enter the cabinet. That is where the thermostat wires are connected.  Since you have a Gas Furnace, you have a Duel Fuel system. Gas and Electric. 

AC Cooling Wizard