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What are you seeing at the junction box in the furnace?
Yes 2 of the blacks are for HUM terminal and EAC terminal the other Black is the live power and White is the Neutral PAGE 28 click here
You can wire in a Wall Switch in line with the Main HOT black wire...basically your Black wire from power would go to one side of the wall switch and the black from the unit would go to the other side for a wall switch operation and white would just connect to White at the furnace.
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