Advice on switching to compatible board for Nest

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Scottcgardner
Posts: 3
Joined: Thu Dec 28, 2017 5:51 pm

Advice on switching to compatible board for Nest

Post by Scottcgardner » Thu Dec 28, 2017 6:18 pm

I have been trying to upgrade to a smart thermostat for sometime now but keep running into the problem with having both a B and O wire. After reading some posts here it appears my solution would be to replace my board? I currently have a EWC-ST-2E. I have two zones, gas with AC.
Can you recommend a new board that would be compatible with a NEST E and is it simple to replace or will I need to hire someone? Thank you, Scott

Paul Z.
Posts: 179
Joined: Thu Dec 08, 2011 3:05 pm

Re: Advice on switching to compatible board for Nest

Post by Paul Z. » Fri Dec 29, 2017 8:55 am

You need too upgrade to an NCM-300. You will not use the "O"-"B" wire on the NCM.

Scottcgardner
Posts: 3
Joined: Thu Dec 28, 2017 5:51 pm

Re: Advice on switching to compatible board for Nest

Post by Scottcgardner » Fri Dec 29, 2017 8:58 am

Great. I noticed on the NCM 300 that for zone two it takes a five wire. I only have a three wire. Is that going to be a problem?

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