Simple wiring

[Terryfly]

I want to use my new Nest thermostats as a simple ON/OFF switch in a 24 circuit. The QR code - see below - fails so it is not clear which model I have, but it was built in Vietnam. The Home Depot order listed  it as a Smart Programmable WiFi Thermostat and listed the price as $129.99. The three terminals on the left side are T, C, and W. On the right side G, R, and OB. Can you ID which two terminals I should use to open and close the 24 V circuit when the set temperature is reached and close when it is above the room temperature? (forget about hysteresis.) 

I expect to be able to control temperatures and setback times using my G-Home app. Will this still function normally with only the two power leads connected?

Can you provide a Google or Nest tech support phone number?

Many thanks,

Terry

QR Code: 1V:E100$P:8$R:4$D:240312$S:43121J3DB3ULW0$E:64166600646D1550$C:MD9SFC$

[Rusell]

Hi Terryfly,

Thank you for posting in the community. I understand that you want to turn off/on switch in a 24 circuit.

For now, I'd to ask some questions to help you out with your concern: 

• Can you share a picture with me about the old wiring installation?
  
• What type of HVAC system do you have? (Heating and cooling, heating only, or cooling only)
• Do you see any error code on your thermostat?
  
• What kind of thermostat do you have?
  • Please take a look at this article: How to tell which Nest thermostat you have - Google Nest Help

Keep me posted.

Best regards,

Rusell.