Quote
On the 66M-50 block assigned for CO lines, put the incoming CO line wires on the last pair of pins at the bottom left
why would you put it on the last pins ?

just take it wherever it is . if your using line three for the alarm , just connect to the wh/gn etc .

segregating the alarm line and putting out of the co order just leads to confusion in my opinion

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Serving SW and West central Fl since 1984