Compatibility with my furnce system

[MattF]

My thermostat has the following wires, V (brown wire), R (red wire), W (white wire), Y1 (yellow wire), G (green wire), and 24(C) (blue wire).  The 24(C) wire might be 24 (O) but dont think so.  Seems that the V wire is what makes it not compatible with my system but no reasoning why on the website.  Also the 24 (C) is not a choice in the compatibility choices.  Is there a way to make the Nest work with my system?  Or is there a different Google thermostat that will work with my system?  

[Patrick_Caezza]

@MattF 

Can you post a picture of the original thermostat's wiring here?

[MattF]

@Patrick_Caezzamy original thermostat wiring

[MattF]

 @Patrick_Caezza

[Patrick_Caezza]

@MattF 

Do you have a Ruud system?

The V terminal is a modulating signal from the thermostat to the furnace and is not compatible with the Nest as it is.

If you look in the furnace at the control board you should be able to see where the blue wire connects. Is the terminal labeled V/W2?

It may be possible to adjust a switch setting on the control board to change it from a variable gas furnace to a two-stage furnace. You will lose functionality of the furnace if you do.

[MattF]

@Patrick_Caezza 

My system is a Rheem Contour series if that helps.  Not sure what Ruud is but assume it is a brand?  I did track the thermostat wires and took a pic. The blue wire goes to the C terminal but the brown wire goes to a the V/W2 terminal.  At the thermostat the brown wire goes to the V terminal.  The blue wire at the thermostat is on the 24V(C) terminal.  Not sure I want to lose functionality of the furnace so maybe if this means it isn't compatible then I may have to change plans.  LMK.  Appreciate the help!  Pics to follow.

[MattF]

 

 @Patrick_Caezza 

[MattF]

I should've Googled first.  Just determined that Ruud is part of the Rheem family. 

[Patrick_Caezza]

@MattF 

Your system uses a modulating thermostat, which allows for variable control of how the furnace produces heat (40%, 60%, or 100%) and other proprietary features.

You can make it act like a two-stage furnace by changing the settings of  SW2, but you'll probably lose functionality if you do.

Here is the changes that will need to be made to switch over to two-stage mode. Do this at your own risk. Besure the HVAC breaker is in the off position.