Upgrade St-2D

[markcrow]

I ordered a NCM300 from you today. My ultimate goal is to put a Nest on Zone 1. I am looking for info on the swap to the NCM300. I believe I saw that it was basically a wire for wire swap abandoning the O and the B.

My current stat, (3M) is using all six wires. Down the right using W and Y on the first Zone 1 Stat terminal and all four on the next. Just a heads up on what is really needed to swap out and the wiring for Nest on Zone 1.

[Paul Z.]

Yes you will not be using "O"or"B" with the NCM-300. The rest is wire for wire call office if having problem 1-800-446-3110X490.

[markcrow]

Thanks Paul. My NCM-300 arrived last night. Nest today. Which wires should I use for the Nest on the new NCM-300?