Nest thermostat install

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Jdeal1

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Heat pump or not?

I attempted to instal a nest thermostat I noticed I have a wire in the O terminal and from what I’ve read this is for the heat pump. However when I put the wire from the O terminal on the old stat to the * O/B terminal on the nest stat when the heat came on my outside unit came on this never happens and cold air came through the ducts. Sos I select the wrong settings while configuring my nest stat?
Everything points to it not being a heat pump unit but why would there be a wire in the O terminal
 

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Jdeal1

Well-Known Member
Joined
Jan 20, 2020
Messages
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Location
Maryland
Solved the O terminal with the orange wire didn’t connect to the furnace or some reason it was connected at the stat. I have straight AC and a furnace no heat pump the O controls. Reversing valve on a heat pump so the installer just put it in the stat for some reason.
 
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