If I'm thinking of the right set up yeah the cylinder stat will at present control the boiler primary pump you want the boiler to control it and the cylinder stat control the switch live to the boiler
I know it's heat only the pump that circulates around the boiler in this type of system is not the ch pump I don't think.
one pump will circulate round boiler and heat the store eg boiler pump and the other pumps the central heating if I'm guessing type of system correctly.
if you wire this...
With the voltages you have the orange should have 240 on it when the valve motors over to ch only it should make a switch to get your voltage on the orange.
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