110V Thermostat Wiring Diagram New Nest Wireless Thermostat Wiring Diagram Save Nest, Generation Pictures
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Nice 110V Thermostat Wiring Diagram Collections - That is how i ended up connecting the nest thermostat. I did no longer connect the c terminal to the transformer since the nest offers me an blunders "no power to rc wire detected" if i try this. Up to now i have never had any low battery problems since nest is able to recharge itself from rc cord.
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I wouldn't observe that recommendation with the aid of mr. Sun due to protection and it is overkill. You don't want the ability to electricity each excessive and low speeds at the same time plus the 3pdt relay isn't required for anything, preserve the dpdt. The same old method is to apply a spdt contact to alternate speeds in order that voltage is best applied to either the low or the excessive however in no way both. So the proper manner is to have the dpdt relay (y1 first level cooling) turn on pump and the time delay relay which controls electricity via the not unusual leg of a second spdt relay. This 2d spdt relay is energized through the y2 for excessive pace. Basically what i'm saying is that the authentic poster had the manage logic precisely correct (except for r8222b1067 coil desires c) on his diagram and that it follows trendy manipulate techniques and i respectfully advocate to no longer comply with the advice given later with the aid of mr. Sun. Nest has intelligence and does not care if you terminate r or rc since it routinely will soar those two connectors. Your hassle is two transformers. I advocate changing the rc840t-a hundred and twenty with a 2nd r822b1067. The transformer energy can be supplied by means of your current furnace transformer already linked. You didn't show your heating wiring so i do not know in case you needed to use the c terminal currently or not. Regularly you do not want the common twine terminated on the nest. Wire the entirety like you firstly display besides the r822b1067 coil goes to c no longer r.