Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

ecobee 3 wiring with true steam 509

Paul_69 Member Posts: 251
I have a true steam 509 on a standard hydro air/airhandler w/ac and I want to wire a ecobee3 with one wire going to acc+ terminal. I believe I need a isolation relay to close contacts on hum and hum terminals on true steam . so i am thinking c fro airhandler to one side of coil on relay, the other side of coil to acc+ which should give me 24 volts when humidification is needed and then no contacts close hum terminals on truesteam which should start humid. and relay in true steam should power g terminal and turn on fan ? first time using for this application, has anybody ever done this or any help... thx.


Sign In or Register to comment.


It looks like you're new here. If you want to get involved, click one of these buttons!