My home has a standalone humidifier, Aprilaire 550, which is plugged into an Aprilaire 4655 manual humidistat. The humidistat currently has a red wire and a white wire plugged into it. There is also a blue wire in the same sleeve unconnected to anything. I understand from Google's guide that the Learning Thermostat can handle humidifier operations through the asterisk port. What is not clear to me is what goes where.
- Do I run the red wire (live?) to the asterisk and nothing else?
- Do I run the red to the asterisk and the white elsewhere?
- Do I ignore the blue wire?
I had a question a few months back that gave me a lot of general information about humidistats and humidifiers, but I still don't know what Nest wants me to plug where and why.
Edit: The pro installer guide tells me that my current setup, which has Rc power connected, does not power the asterisk / star connector. This tells me that one of the humidistat wires should likely go to Rh, which would power that connector.
