Hi, just bought a wireless thermostat (celect) and need to connect it. The installation instructions aren't very clear (to an electrical novice). Boiler is new and as yet has not been fired up, the only flex currently going to the boiler is taken from a switched fused spur(from ring main) and also a single looped wire already attached. My question is.... how do I connect the thermostat to the boiler, there are 4 ports on the receiver labelled 1, 2, N & L. Do I use a 2core from L & N from boiler to receiver and another 2 core from where looped wire is/was to 1&2 terminals on receiver? Please reply in laymans terms....