I want to install a new ventilation fan in the bathroom - probably a humidistat type as the room is generally cold - but I want to be able to "isolate" the fan ie stop the automatic stat effect if need be. I already have a three core cable installed from the light fitting to the fan and do not want to add or change this arrangement. I think Manrose offer a pull cord arrangement as an "overide" but does this simply turn on the fan when the stat is off or do what I want and disable the fan ??
Does anyone know how this operates or functions ? If I had a circuit or wiring diagram I could probably see how this works, does anyone have any advise on operation/solution/details of wiring ??