Compatibility?

[Jgilray]

My current system is a gas furnace with an AC. The compatibility checker told me to take a picture but not where to post it so I’ll try here. Thanks!

[CoolingWizard · Accepted solution]

Your system can use any of the Nest Thermostats. The W1 and B together sometimes confuses the compatibility checker. Use the wires R, Y, G, W, B. 

AC Cooling Wizard

[CoolingWizard · Accepted solution]

I am sorry for the late reply. You meed to note what color wire is attached to which label terminal pf your old thermostat.  So is Blue was on C, then Blue goes to C on the Nest. 

AC Cooling Wizard

[Jgilray]

Oops, no way to post a picture here?  I have R, W1, Y, G, B wires

[Patrick_Caezza]

Click on the picture icon in the reply window. 

[CoolingWizard · Accepted solution]

Your system can use any of the Nest Thermostats. The W1 and B together sometimes confuses the compatibility checker. Use the wires R, Y, G, W, B. 

AC Cooling Wizard

[Jgilray]

Thank you!  Can you recommend a particular Nest or <whispering> ecobee product?

[CoolingWizard]

@Jgilray Your system is a basic system with 1 Heat and 1 Cooling cycle.  There is no need to buy a Nest Learning model unless you want or need the advanced features.  

AC Cooling Wizard

[Jgilray]

Thanks again.  I ordered a nest and see that the wires are labeled r, y, g, w, c, ob.  Should I hook the blue wire to OB? and leave C unconnected?

Thanks!

[Jgilray]

After more reading, it seems that the blue wire should go to the C nest connector, that would leave OB unconnected.  Is that correct?  Thanks again!

[CoolingWizard · Accepted solution]

I am sorry for the late reply. You meed to note what color wire is attached to which label terminal pf your old thermostat.  So is Blue was on C, then Blue goes to C on the Nest. 

AC Cooling Wizard

[Jgilray]

Hi and thanks!

I believe that I just change from our current "Trane climate control" thermostat as follows:

 - red wire (power?) to R (currently hooked to R on climate control thermostat)

 - white wire (heat?) to W (currently hooked to W1)

 - green wire (fan?) to G (currently hooked to G)

 - yellow wire (cool?) to Y (currently hooked to Y)

 - blue wire (common?) to C (currently hooked to B)

Looking at the manual for our trane thermostat it really looks like B is "common".  The thermostat has no "C" connection, it has Y2, W2, S1, S2, RC (all currently disconnected) R, W1, Y, G and B (all connected).

Thanks again!

[CoolingWizard · Accepted solution]

Some programable thermostat use the letter B to signify Power Common. When heat pumps came into the market there were two types; Those that default to Heating and the second default to Cooling. They were B models and O models. Thus the confusion began. So the industry started using C as the common designator.  So place your blue wire that is on B to the Nest C terminal. 

AC Cooling Wizard