If you're posting a request for installation help, please provide as much info about your system as possible. For example, for help regarding connecting a smart thermostat, please include details about your system including whether you have gas/electric, heat pump, number of heat stages, A/C condenser, etc.

Humidifier 2 wire vs 1 wire advantages

I have Trane HUMD300. It is my understanding I can either connect the humidifier to the Ecobee3 by either using 2 wires or 1 wire.

For the 2 wires I will have to external power my Humidifier by using a little 24v transformer and then using ACC+ and ACC- as follow

transformer --> ACC+
transformer ---> Humidifier solenoid (one end)
Humidifier solenoid ---> ACC-

For 1 wire it will be as follow:

Humidifier solenoid ---> ACC+
Humidifier solenoid ---> Furnace Common (C)

Any advantages of one setup over the other?


Sign In or Register to comment.