Can I use taco valve 571 common wire for nest c wire?

[Robertbiron]

I have a house/furnace built in the 1980s.  We have only red and white wires connected to thermostat.  Thankfully they ran a third wire from the taco valves up to all three thermostats.   Is it as easy as connecting the third wire to the c wire connect on nest and to the common port (second) on the taco valve?

[Patrick_Caezza]

@Robertbiron 

Theoretically, you should be able to connect the C terminal of the thermostat to terminal 2 on the valve, the W terminal to terminal 1, and the R terminal to the 24Vac transformer.

Figure C shows the wiring that I am referring to.

Heat Motor Zone Valves 

[Robertbiron]

Yes, that worked

[Jenelyn_O]

Hi folks,

@Robertbiron, thanks for the update and I'm glad that the issue is now resolved. Please let us know if you have further questions or concerns. Otherwise, I'll be locking this thread after  24 hours. 

I appreciate your help, @Patrick_Caezza and Jake. 

Regards,

Jenelyn

[Jake]

Hey there,

Thanks for the helpful reply Patrick_Caezza.

I wanted to check in and see if you managed to see Patrick_Caezza's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.

Best regards,
Jake