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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.