The wiring matching from honewell peaksaver PLUS to Nest Learning

[nickwoo]

Hi,

I am using the honewell peaksaver PLUS thermostat and would like to replace with Nest Learning Thermostat.

The old one get wire for K, R,W and C.

I cannot find K wire for Nedt Learning.

And should R to Rc, W to W1?

How should it map with Nest Learning Thermostat? Thanks

 

[Houptee]

There is a Honeywell box at your furnace that is similar to a Nest power adapter that simulates a C wire when you do not have enough wires to connect a real C wire.

So you would remove that little Honeywell box at the furnace and either run a new 8 conductor thermostat wire to the Nest and use blue for a C wire,  or leave the old wire and the Nest Learning might be ok without a C wire if it does not give any power errors it should be fine. If not then you would need to use a Nest power adapter to simulate a C wire.

So if you want to try using the old wires first get rid of that Honeywell box and put the old wires directly to the furnace terminals R, W, Y, G (use black for Y)  then do the same at the Nest and see it it works without a C wire.

[Jenelyn_O]

Hi there,
 

Thanks for posting in the Google Nest Community forum. I hope you get the answer you're looking for. You can visit this link to check more information about compatibility.
 

I appreciate your help, @Houptee.
 

Best,

Jenelyn

[nickwoo]

Thanks, I connect the black wire to Y1 and it works now. Thanks for the reply.

[Jenelyn_O]

Hey nickwoo,

Thanks for the update! That's good to know. Please let us know if you still have questions or concerns, as I'll be willing to assist you further. Otherwise, I'll be locking this thread after 24 hours. 

Regards,

Jenelyn