Combining 2 circuits

I would like to combine my AC (#17 & #19 below) and Furnace (#21 below) . Currently I have a CT on #19 (input is doubled) and another CT on #21. There is no reason to have AC and Furnace separated. I just need to confirm that I can combine #17, #19 and #21 in one CT. #17 would connect in the CT “top down” (or in reverse of the other two) while #19 & #21 connect normally. The “Double” option for Input for #19, which is currently checked, would be unchecked.

Does this sound right?

Sounds right except that I believe it’s 19 that would be reversed.

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You are right. It was/is reversed now