Google Nest Community

CoolingWizard · 05-17-2022

In my HVAC business I install thermostats all the time. However recently my distributor started carrying nest thermostats. Through a promotion form the HVAC distributor, I bought a few thermostats for the trucks and installed the first one for a cust...

CoolingWizard

@jonatan686 , Unfortunately, no. The conventional HVAC control systems use a step-down transformer to take wither 120V or 240v and reduce it to 24V for the control. This 24V is what is sent to conventional thermostats. Your type thermostat directly c...

CoolingWizard

@jonatan686 , your thermostat operation for 120 V line voltage. This is not compatible with a nest thermostat or any conventional HVAC thermostat.

CoolingWizard

@kingsdaughter44 , yes you have a 2-stage Heating and 2-Stage cooling. You will need a Nest Learning Thermostat. The basic Nest Thermostat cannot handle 2-stage of heat and 2-stages of cooling. AC Cooling Wizard

CoolingWizard

Your Trane is currently using a proprietary digital communications. It can be converted to conventional HVAC controls. You would re-wire the air handler putting red on R, White on W1, Yellow on Y1, Green on G, and Blue on B/C. On the nest thermostat ...

CoolingWizard

Yes indeed it does. Since your furnace is so sensitive to the 200mA charging current, you need to have the resistor to pull the current to the ground and stop the transient back flow. AC Cooling Wizard

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