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 need help: 110v to nest
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FrankieDaFish
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Posted - 05/01/2017 :  09:28:34 AM  Show Profile  Reply with Quote
Hi all. So I decided to upgrade to a Nest without checking compatibility. My current system is hot water with 2 zones. Ones 24v and of course the one I'm replacing is 110v with only 2 wires to it. Each thermostat goes to it's own Honeywell R845a relay. I'm just gonna run a new 18/5 wire to replace the 110v line so I won't even be using that old 2 wire. I know I'll only be using 3 of the 5 wires (running 5 in case of future upgrades), but how would I wire it at the relay? I wish I could figure out how to post pics of my system and the relays to better explain, but I can't figure out how to. If I figure it out I will. Thanks in advance for any help. Oh, and I bought an Aube RC840T-120 before I realized I needed a 3rd wire as the common. I was planning on returning the Aube if it's not needed, but I have it in case it is needed.
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