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Hello, since this humidifier has a transformer installed with it, you bring one wire from humidifier to Humidistat and then a wire from humidistat to Transformer. You will need a current sensing relay to turn the humidifier on and off with the Furnace cycle. I will attach a link for a wiring diagram for your Humidifier http://docs.electronicaircleaners.com/aprilaire_700a_installation.pdf
They are talking about the Humidistat which is separate to the Humidifier. Turn the power off to the furnace and that will disconnect any power to the humidifier. Turn the water off to the Humidifier if you have to remove it from the plentum. Then go ahead and install your new evaporator. If you are looking for the humistat follow the T-stat wire and see where it goes from the water valve of the humidifier...... But they may not have installed one and are useing a different way to turn the Humidifier on in the heating cycle.....
Scroll down towards bottom of page. I looked under the heading "CURRENT RESIDENTIAL MANUALS", and clicked on "Humidifier Model 600 Series Safety and Installation Instructions Template with Model 60".
I suppose you are looking at the do-it-yourself model. Depending on the wire that is run up to you Regular Thermostat from your furnace. You may have to run a seperate line for the Humidistat. A digital thermostat that does Humidity and Temperature is recommended. Or you could just place a Humidistat near the furnace room. A wiring diagram will come with the Humidifier discribing the different ways to wire it.
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