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I’m hoping that someone can help me with a wiring question that I have on my GeneralAire Model 1000 flow through humidifier. I just recently installed an Ecobee4, which is working fine, and now I’m looking to hook up my GeneralAire humidifier. Previously the humidifier was hooked up using a 24v transformer, and its own digital GeneralAire E2 humidistat, and then used a current sensing relay to turn on when humidity was called for. So the humidifier was not wired directly to the furnace, which is a Carrier 58 VUA. The humidifier also has a fan that is powered by a 120v plug. This humidifier appears to be different from the other ones I’ve seen in other posts, in that it has the typical two yellow wires, but also has two red wires.
To the thermostat, I have a five pair cable running that can be used exclusively for the humidifier, so I can run a single wire or two wire setup if needed. I tried what I thought should work, which was nothing to each separate red wire, a single wire from the Ecobee4 ACC+ to one of the yellow wires on the humidifier, and then another wire from the furnace c terminal to the other yellow humidifier wire, and it doesn't work.
The thing that is confusing me is the red wires. In the prior standalone installation, I hooked up the yellow wires as instructed, and then tied the two red wires together and left it at that (which worked for years). I don't see anything in the documentation that tells me to do that with the red wires, so how I knew to do that is actually a mystery to me. I could just tie them back together and see what happens, but given the outside temps in WI right now, I’m reluctant to do that in case something goes wrong.
I’m attaching the GeneralAire page that shows the wiring options, a picture of what the wires currently look like, and a picture of how it used to be hooked up with the GeneralAire E2 humidistat. In the previous hookup picture, the red and white wires are coming from the current sensing relay, the yellow and blue are going to the E2 humidistat, and the 24v transformer power (not pictured) is going directly to the humidistat.
Any thoughts on what I might be doing wrong would be greatly appreciated.
As a secondary question and possible approach, I have 24 v power running from a plugin transformer up to the thermostat, which used to be used for the E2 humidistat. My question is, should I be using that as the source of power for the Ecobee4 and humidifier solenoid, vs the C wire from the furnace? Does it matter? I assume the only potential issue is the load on the furnace board correct?
Thanks in advance.
GeneralAire 1000 wiring page -
Not wired -
Previous standalone wiring -