New NEST thermostat - previous EMERSON unit had HEAT/COOLING/OFF options - NEST has only HEAT mode

[skuppers]

Curious - Installed the C-wire 'kit' and the battery warning is gone.  My previous EMERSON unit had HEAT/COOLING/OFF options - this new NEST has only HEAT mode with some fan options.  What happened to the COOL mode?   

R / W / G wiring ( no Y )

The furnace has a R / W / G setup with a Black wire connected to the R and a White wire connected to the G also ( no Y ). We don't have any AC plugged in.  

Shouldn't I still have a COOL option? 

EDIT - the old system appears to have a BW rather than just a W...

[EduardoN]

Hi @skuppers, 

Thanks for contacting this community! I completely understand your concern about having only heat mode on your new Nest Thermostat, especially since your previous Emerson unit had heat, cool, and off options. This situation can be confusing since the cool mode worked on the old thermostat. No worries, I'm here to help!

I appreciate your efforts in installing the Nest Power Connector in your system. I understand that the battery warning is now gone, which is a good sign. However, regarding your wiring situation, while some thermostats can operate with a single wire connected to the W terminal for both heating and cooling, Nest Thermostats are not designed to work that way. Based on this, the best recommendation is to contact a technician to get the appropriate installation.

Please feel free to share any additional details you think might be relevant.

Best regards,
Eduardo