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You have the right idea. If there is definitely no continuity between "1" and "A/B/C" with the contactor manually closed that gets interrupted by the Down button, then as you have identified there is a need for the orange wire on your diagram yet nowhere to connect it....I'm not very good at leaving things I don't completely understand so before I move on to resolve the practical issue of incorporating a 230v dols would someone please confirm the correctness of my wiring diagram.
I find myself wondering if the other terminal with the two other coil wires is somehow involved. More testing needed!
The theory that Lucien suggested, which seems likely, is that the coil is either two coils or tapped at various points, enabling the supply voltage to vary. There are two things to do to explore this further...2 things (I am aware of) I don't understand:
1, why 2 of the wires exiting the coil join at a terminal?
1 - measure the resistance of the two coil wires that are not joined together, the red and ?grey once. Also measure the resistance of all permutations of the 4 coil wires. Report back on that.
2 - confirm that the terminal that has the two wires joined together has no electrical continuity to any other terminal (with the coil disconnected).
That is indeed the question, see above.2, assuming I can use 'L3-C as I have to provide current to the off switch (NC) when on switch (no) released, any idea how I would facilitate the 'orangey '(on diagram) connection to C
Keep at it, you are doing well!