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Does anyone know what the white link cable is next to the EMS Bus connector - the manual states it's a "On/Off thermostat input" guessing it's closed so that the heating just comes on, but don't know if the EMS bus or a controller would over-ride that or if you fit a controller should you remove it?
Thanks in advance!
Thanks in advance!
![20201015-130319.jpg](https://us.v-cdn.net/6031070/uploads/MLENXOTD9O4D/20201015-130319.jpg)