Can anybody advise me on how to connect up a Salus RT500RF to a Baxi Combi 105E please? If I understand it correctly the Salus controller just acts to close a circuit on two wires coming from the Baxi, behind where the existing controller is fitted there are two cables coming out of the wall each with a red and black core. Presumably one is from the 240v supply to the controller and the other is the switching cable from the Baxi? Thanks