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they are wired direct to humidistat and the humidisitat is acting as a light switch ....whenever it calls for humidity it runs whether furnace is running or not.
You could break the HUM relay on the circuit board with a relay....you could install a air switch in duct....you caould also run the hot black off EAC terminal on the circuit board.
Most every Bryant/Carrier I have seen has a EAC terminal over by the blower terminals.
When yu say black and white to switch box area I am assuming you have the 760 with the fan inside that blows within the humidifier itself?
The HUM on a Bryant/Carrier is 24v...and you already have 24v n your unit.
The unit gets main power from black and white (120v),,this powers it own transformer inside..so the 2 yellow wires you see ar 24v and just need to be connected.
EAC would near HEAT, COOL, PARK...EAC = Electric air cleaner and puts out 120v whenever blower runs.
The black wire from humidifier needs 120v.
That is the only power this unit needs supplied.
The black wire needs to be hooked to 120v.
The 2 yellow wire (or brown) from the unit already carry 24v so we cannot put them on HUM as 24 v is already there.
What is the model number of the furnace?....or post pic of the circuit board and I will tell you where to attach
I apologize..lost connection..let me check pic
yes you are correct. This way the humidifer only gets power during blower operation..
did you get the last response? That is exactly where I said to install...EAC...black yo black and white to white